阅读说明：本技术 一种大豆卵磷脂提纯浓缩方法及装置 (Method and device for purifying and concentrating soybean lecithin ) 是由 金日生 朱梦男 张华� 袁传勋 胡康棣 于 2021-06-30 设计创作，主要内容包括：本发明涉及大豆卵磷脂制备技术领域,具体公开了一种大豆卵磷脂提纯浓缩方法及装置；包括壳体、夹套,壳体的内部同心设置有转动杆,转动杆的上端设置有与壳体内壁相贴合的螺旋叶刮板,螺旋叶刮板的外端均匀开设有若干漏流口转动杆的下端连接有壳体内壁相贴合的条形刮板；壳体的上端连接有倒圆台形的端罩,端罩中设置有原液槽,转动杆的顶端与原液槽相连接,原液槽的外侧面均匀连接有内置密封活塞的排液管；本发明公开的浓缩装置在无需提高浓缩温度、延长蒸发器长度的前提下,对大豆卵磷脂提纯液进行充分浓缩,并且有避免了大豆卵磷脂高温易变质的问题,整个设备结构简单、占用空间小、对大豆卵磷脂的浓缩效果优异。(The invention relates to the technical field of preparation of soybean lecithin, and particularly discloses a method and a device for purifying and concentrating soybean lecithin; the spiral blade scraper is characterized by comprising a shell and a jacket, wherein a rotating rod is concentrically arranged in the shell, a spiral blade scraper attached to the inner wall of the shell is arranged at the upper end of the rotating rod, and a plurality of strip-shaped scrapers attached to the inner wall of the shell are uniformly arranged at the lower ends of the rotating rods with leakage openings; the upper end of the shell is connected with an end cover with an inverted frustum shape, a raw liquid tank is arranged in the end cover, the top end of the rotating rod is connected with the raw liquid tank, and the outer side surface of the raw liquid tank is uniformly connected with a liquid discharge pipe internally provided with a sealing piston; the concentration device disclosed by the invention can be used for fully concentrating the soybean lecithin purified liquid on the premise of not increasing the concentration temperature and prolonging the length of the evaporator, and the problem that the soybean lecithin is easy to deteriorate at high temperature is solved.)

1. A soybean lecithin purification and concentration device comprises a thin film evaporator shell and a jacket arranged on the outer side surface of the thin film evaporator shell, and is characterized in that a rotating rod is concentrically arranged in the thin film evaporator shell, a spiral blade scraper attached to the inner wall of the thin film evaporator shell is arranged at the upper end of the rotating rod, a plurality of leakage ports are uniformly formed in the outer end of the spiral blade scraper, and a strip scraper attached to the inner wall of the thin film evaporator shell is connected to the lower end of the rotating rod;

the upper end of film evaporator casing is connected with the end shield of inverted circular truncated cone shape, be provided with former liquid groove in the end shield, the top and the former liquid groove of dwang are connected, the lateral surface in former liquid groove evenly is connected with the sealed fluid-discharge tube of a plurality of outer ends, a plurality of outage have been seted up at the lower surface interval of fluid-discharge tube, be provided with sealing piston in the fluid-discharge tube, be connected with the spring between sealing piston and the outer terminal surface of fluid-discharge tube, be connected with the connecting axle that stretches out the end shield on the former liquid groove, and connecting axle, dwang and former liquid groove set up with one heart, the outer end of end shield is provided with the drive arrangement who acts on the connecting axle.

2. The soybean lecithin purification and concentration device as claimed in claim 1, wherein the thin film evaporator shell is a straight cylindrical shell which is formed integrally.

3. The soybean lecithin purification and concentration device as claimed in claim 1, wherein the thin film evaporator shell is formed by connecting a first outer shell with a straight cylindrical upper section and a second outer shell with a truncated cone lower end.

4. The apparatus for purifying and concentrating soybean lecithin as claimed in claim 1, wherein a concentrate discharge pipe is connected to the lower end of the shell of the thin film evaporator, and a valve is disposed on the concentrate discharge pipe.

5. The apparatus for purifying and concentrating soybean lecithin as claimed in claim 1, wherein the plurality of drain holes are provided at equal intervals on the lower surface of the drain pipe, and are all inclined outward.

6. The soybean lecithin purification and concentration device according to claim 1, wherein the upper end of the end shield is connected with a negative pressure air pipe, the side surface of the end shield is connected with a liquid feeding pipe extending into the end shield, and the inner end of the liquid feeding pipe is arranged above the stock solution tank.

7. The soybean lecithin purification and concentration device according to claim 1, wherein the driving device comprises a variable frequency motor arranged outside the end shield, an output shaft of the variable frequency motor is connected with a driving pulley, an upper end of the connecting shaft is connected with a driven pulley, and a transmission belt is connected between the driving pulley and the driven pulley.

8. A purification and concentration method using the apparatus of any one of claims 1 to 7, comprising the steps of:

1) the soybean lecithin extracting solution obtained through the steps of deoiling, extracting, separating, adsorbing and filtering is input into a stock solution tank;

2) heating heat conducting oil to 110-130 ℃, injecting the heat conducting oil into a jacket to heat the shell of the thin film evaporator, pumping the shell of the thin film evaporator to a negative pressure state, and continuously pumping air in the subsequent concentration process;

3) starting the driving device to enable the raw liquid tank to rotate in the end cover at a rotating speed of 80-150 r/min, enabling a sealing piston in the liquid discharge pipe to move outwards due to the action of centrifugal force when the raw liquid tank rotates, so that a liquid discharge hole at the lower end of the liquid discharge pipe is opened, and the soybean lecithin extracting solution in the raw liquid tank is thrown out of the liquid discharge hole and falls on the conical inner wall of the end cover;

4) and the soybean lecithin extracting solution flowing down along the conical inner wall of the end cover flows downwards along the inner wall of the shell of the thin film evaporator, is completely coated on the inner wall and slowly flows downwards under the action of the spiral blade scraper and the strip scraper in the downward flowing process, is subjected to temperature rise evaporation, and is finally discharged from the lower end.

Technical Field

The invention relates to the technical field of preparation of soybean lecithin, and particularly discloses a method and a device for purifying and concentrating soybean lecithin.

Background

The soybean lecithin is phospholipid extracted from soybean oil residue as a raw material, mainly comprises phosphatidylcholine (lecithin), phosphatidylethanolamine (cephalin), phosphatidylinositol (inositol phospholipid) and the like, has the functions of emulsifying property, oxidation resistance, cholesterol reduction, blood fat regulation and the like, has the nutrition and health care functions of delaying senility, enhancing memory, preventing cardiovascular and cerebrovascular diseases and the like, and is widely applied to the industries of food, medicines, cosmetics, feed and the like at present. Concentration is an essential processing step in the preparation of soy lecithin. At present, because the soybean lecithin has the characteristics of high heat sensitivity and easy oxidation, the soybean lecithin is generally concentrated by adopting a thin film evaporator.

For example, utility model CN2013203577596 discloses a thin film evaporator for phospholipid processing, which comprises a driving section, an evaporation separation section, a jacket heating evaporation section and a discharge section, wherein the driving section, the evaporation separation section, the jacket heating evaporation section and the discharge section are connected by flanges from top to bottom. The jacket heating evaporation section is internally provided with a jacket barrel heating chamber, the jacket barrel heating chamber is provided with an inner barrel and an outer barrel which form a jacket, the outer wall of the inner barrel is axially provided with at least one reinforcing ring, and the reinforcing ring and the outer barrel are spaced. The utility model discloses a thin film evaporator for phospholipid processing though can be used for the concentrated processing of soybean lecithin, but soybean lecithin extract can't effectively spill on the inner wall of evaporimeter in the use, and soybean lecithin extract is very fast along the inner wall downstream's of evaporimeter speed when using this thin film evaporator to purify in addition, lead to the concentration effect not good, want to improve the concentration effect and can only follow extension evaporimeter length and improve the hot medium temperature in the clamp cover, and extension evaporimeter length can lead to that whole equipment occupation space is big, and high in manufacturing cost, higher temperature arouses the rotten of soybean lecithin easily again. Therefore, based on the defects of the existing thin film evaporator for concentrating the soybean lecithin, the soybean lecithin purifying and concentrating device and the method for concentrating by using the device are provided.

Disclosure of Invention

The invention aims to solve the problem that the existing thin film evaporator cannot be applied to soybean lecithin concentration, and provides a device capable of effectively concentrating soybean lecithin and a method for concentrating by using the device on the premise of not increasing the concentration temperature and the height of the thin film evaporator.

The invention is realized by the following technical scheme:

a soybean lecithin purification and concentration device comprises a thin film evaporator shell and a jacket arranged on the outer side surface of the thin film evaporator shell, wherein a rotating rod is concentrically arranged in the thin film evaporator shell, a spiral blade scraper attached to the inner wall of the thin film evaporator shell is arranged at the upper end of the rotating rod, a plurality of leakage ports are uniformly formed in the outer end of the spiral blade scraper, and the lower end of the rotating rod is connected with a strip scraper attached to the inner wall of the thin film evaporator shell;

the upper end of film evaporator casing is connected with the end shield of inverted circular truncated cone shape, be provided with former liquid groove in the end shield, the top and the former liquid groove of dwang are connected, the lateral surface in former liquid groove evenly is connected with the sealed fluid-discharge tube of a plurality of outer ends, a plurality of outage have been seted up at the lower surface interval of fluid-discharge tube, be provided with sealing piston in the fluid-discharge tube, be connected with the spring between sealing piston and the outer terminal surface of fluid-discharge tube, be connected with the connecting axle that stretches out the end shield on the former liquid groove, and connecting axle, dwang and former liquid groove set up with one heart, the outer end of end shield is provided with the drive arrangement who acts on the connecting axle.

As a further arrangement of the above scheme, the thin film evaporator shell is a straight cylindrical shell which is integrally formed; the integrated thin film evaporator shell is one of the arrangement schemes.

As a further arrangement of the scheme, the thin film evaporator shell is formed by connecting an upper straight cylindrical first outer shell and a lower round table shaped second outer shell; the second middle setting scheme is assembled by two straight cylinder-shaped outer shells and a lower end circular truncated cone-shaped outer shell.

As a further arrangement of the above scheme, the lower end of the shell of the thin film evaporator is connected with a concentrated liquid calandria, and a valve is arranged on the concentrated calandria; the soybean lecithin concentrate can be discharged by opening the valve.

As a further arrangement of the above scheme, a plurality of liquid discharge holes are arranged at equal intervals on the lower surface of the liquid discharge pipe, and the liquid discharge holes are all arranged in an outward inclined manner; the drain hole is arranged in an outward inclined manner, so that discharged extracted liquid is thrown outwards and falls on the conical inner wall of the end cover, and the effect of the uniform distributor is achieved.

As a further arrangement of the scheme, the upper end of the end shield is connected with a negative pressure air pipe, the side surface of the end shield is connected with a liquid adding pipe extending into the end shield, and the inner end of the liquid adding pipe is arranged above the raw liquid tank; the negative pressure air pipe can pump away the shell air of the film evaporator before concentration to prevent the soybean lecithin from deteriorating, and the boiling point of a solvent in an extracting solution during evaporation concentration can be reduced through the negative pressure effect, so that the temperature during concentration is reasonably reduced.

As a further arrangement of the above scheme, the driving device comprises a variable frequency motor arranged outside the end shield, an output shaft of the variable frequency motor is connected with a driving pulley, the upper end of the connecting shaft is connected with a driven pulley, and a transmission belt is connected between the driving pulley and the driven pulley; the above-mentioned only one kind of setting mode, can also realize the drive through setting up the inverter motor who has the speed reducer and directly being connected with the connecting axle.

A purification and concentration method using the device comprises the following steps:

1) the soybean lecithin extracting solution obtained through the steps of deoiling, extracting, separating, adsorbing and filtering is input into a stock solution tank;

2) heating heat conducting oil to 110-130 ℃, injecting the heat conducting oil into a jacket to heat the shell of the thin film evaporator, pumping the shell of the thin film evaporator to a negative pressure state, and continuously pumping air in the subsequent concentration process;

3) starting the driving device to enable the raw liquid tank to rotate in the end cover at a rotating speed of 80-150 r/min, enabling a sealing piston in the liquid discharge pipe to move outwards due to the action of centrifugal force when the raw liquid tank rotates, so that a liquid discharge hole at the lower end of the liquid discharge pipe is opened, and the soybean lecithin extracting solution in the raw liquid tank is thrown out of the liquid discharge hole and falls on the conical inner wall of the end cover;

4) and the soybean lecithin extracting solution flowing down along the conical inner wall of the end cover flows downwards along the inner wall of the shell of the thin film evaporator, is completely coated on the inner wall and slowly flows downwards under the action of the spiral blade scraper and the strip scraper in the downward flowing process, is subjected to temperature rise evaporation, and is finally discharged from the lower end.

Has the advantages that:

1) the concentration device disclosed by the invention is based on the existing thin film evaporator, a rotating rod is arranged in an outer shell, a spiral blade scraper attached to the inner wall is connected to the upper end of the rotating rod, a strip scraper is connected to the lower end of the rotating rod, the spiral blade scraper can scrape materials upwards when purified liquid flows downwards along the inner wall in the evaporation concentration process, the purified liquid on the inner wall can smoothly flow downwards when the purified liquid flows upwards through a leakage port, and then the purified liquid is uniformly coated on the inner wall at the lower end by the strip scraper, so that the flowing time of the lecithin purified liquid along the inner wall is prolonged to a great extent, the concentration device designed in the whole fully concentrates the soybean lecithin purified liquid on the premise of not increasing the concentration temperature and the length of an evaporator, and the problem that the soybean lecithin is easy to deteriorate at high temperature is effectively avoided by controlling the temperature of a heat medium, the whole equipment has simple structure, small occupied space and excellent concentration effect on the soybean lecithin.

2) The upper end of the concentration device is provided with an inverted conical end cover, a raw liquid tank is arranged in the end cover, the outer circular surface of the raw liquid tank is uniformly connected with liquid discharge pipes internally provided with sealing pistons, a plurality of liquid discharge holes are formed in the lower surface of each liquid discharge pipe at intervals, when the raw liquid tank rotates along with a rotating rod, the sealing pistons in the liquid discharge pipes move outwards under the action of centrifugal force, so that the liquid discharge holes in the lower surface are opened, then raw purified liquid can be thrown off from the liquid discharge holes onto the conical inner wall of the end cover and then flows downwards, and the effect of uniform distribution and blanking can be achieved; simultaneously, the design of above-mentioned structure can realize the regulation to former purification liquid unloading speed through the rotational speed that changes the dwang, spiral leaf scraper blade and bar scraper blade rotational speed also increase in step when unloading speed increases, consequently can guarantee even when unloading speed increases, there is the heat exchange of longer time along the purification liquid that the inner wall flows down and inner wall, reach abundant concentrated technological effect, make when concentrating soybean lecithin adjust the parameter more easily, hold, the practicality is strong.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of an internal plan structure of embodiment 1 of the present invention.

Fig. 2 is a schematic view of an internal plane structure in embodiment 2 of the present invention.

Fig. 3 is a schematic perspective view of embodiment 2 of the present invention.

Fig. 4 is a schematic perspective view of a rotary rod, a spiral blade scraper, and a strip scraper in example 2 of the present invention.

FIG. 5 is a schematic perspective view of a stock solution tank and a drain pipe according to the present invention.

FIG. 6 is a schematic view showing the inner plane structure of the stock solution tank and the drain pipe in the present invention.

The device comprises a film evaporator shell, a first shell, a second shell, a jacket, a temperature sensor, a concentration liquid discharge pipe, a temperature sensor, a meter, a temperature sensor, a temperature.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", and,

The terms "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like, refer to an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to the accompanying drawings 1 to 6, in conjunction with the embodiments.

Example 1

The embodiment 1 discloses a film evaporation concentration device for soybean lecithin purification liquid, refer to fig. 1, including cylindric film evaporator casing 1, the outer disc surface of film evaporator casing 1 is provided with jacket 2 that can fill into heat medium, the upper and lower both ends of jacket 2 are connected with heat medium and advance pipe 3 and exit tube 4 to be provided with temperature sensor 201 in jacket 2, its heat medium generally chooses the conduction oil when concentrating the soybean lecithin purification liquid, can realize carrying out accurate control to the temperature of casing 1 inner wall through controlling the heating temperature of conduction oil.

A concentrate discharging pipe 5 is connected to the lower end of the thin film evaporator shell 1, and a manual sealing valve 6 is arranged on the concentrate discharging pipe 5. A vertical rotating rod 7 is arranged in a shell 1 of the thin film evaporator, a spiral blade scraper 8 attached to the shell 1 is arranged at the upper end of the rotating rod 7, and a plurality of leakage ports 801 are uniformly formed in the spiral blade scraper 8 along the outer end of a spiral line of the spiral blade scraper. A plurality of cross rods 9 are circumferentially connected at the lower end of the rotating rod 7, a bar-shaped scraper 10 which is vertically arranged is connected at the outer end of each group of cross rods 9, and the bar-shaped scraper 10 is attached to the inner wall of the shell 1. When lecithin purification liquid flows downwards along the thin film evaporator shell 1, the extraction liquid flowing downwards can be scraped upwards along the inner wall by the rotation of the spiral blade scraper 8, part of the purification liquid flows downwards along the leakage flow port 801 during scraping, is scraped by the spiral blade on the lower layer during flowing, and is coated on the lower end of the inner wall of the thin film evaporator shell 1 by the strip scraper when finally flowing to the strip scraper 10. The arrangement of the whole spiral blade scraper and the leakage flow port 801 can ensure that the purification liquid flowing downwards along the inner wall smoothly reaches the bottom end of the shell 1 of the thin film evaporator, and meanwhile, the time for heating and concentrating the purification liquid on the inner wall is prolonged, so that the purification liquid can be fully evaporated and concentrated.

An end cover 11 in the shape of an inverted truncated cone is connected to the upper end of the thin film evaporator shell 1, and the end cover 11 can be integrally formed with the thin film evaporator shell 1 or can be connected with the thin film evaporator shell in a sealing mode through a flange. A stock solution tank 12 is provided in the end cover 11, and the top end of the rotating lever 7 is connected to the center of the lower surface of the stock solution tank 12. The bottom wall of the stock solution tank 12 is also connected with a connecting shaft 13 extending out of the upper surface of the end cover 11, and the connecting shaft 13 is rotatably connected with a sealing bearing when extending out of the upper surface of the end cover 11. Wherein, the connecting shaft 13, the rotating rod 7 and the raw liquid tank 12 are all arranged concentrically.

The lower end of the outer circle surface of the stock solution tank 12 is connected with a plurality of liquid discharge pipes 14, the inner ends of the liquid discharge pipes 14 are communicated with the stock solution tank 12, and the outer ends are arranged in a sealing way. A plurality of drain holes 141 are provided at equal intervals on the lower surface of drain pipe 14, and each drain hole 141 is provided obliquely outward. A spring 15 is connected to the inside of the outer end of the discharge pipe 14, a seal piston 16 fitted to the discharge pipe 14 is connected to one end of the spring 15 facing the raw liquid tank 12, and a high-density iron block 17 is filled in the interior of the seal piston 16. Through the design, when the stock solution tank 12 rotates, the sealing piston 16 in the liquid discharge pipe 14 moves outwards under the action of centrifugal force, at the moment, the liquid discharge hole 141 formed in the lower surface of the liquid discharge pipe 14 is opened, and the soybean lecithin purified liquid in the stock solution tank 12 is thrown out from the liquid discharge hole 141 and falls on the inner wall of the shell 1 of the thin film evaporator, so that the uniform distribution effect is achieved. Meanwhile, the structural design of the raw liquid tank 12 can also adjust the quantity of the liquid discharge holes 141 opened on the liquid discharge pipe 14 by changing the rotating speed, thereby realizing the adjustment of the liquid discharge quantity.

In order to realize the arbitrary adjustment of the rotation speed of the stock solution tank 12, a power device capable of driving the connecting shaft 13 is arranged on the end cover 11, the power device comprises a variable frequency motor 18 fixedly arranged on one side of the end cover 11, a small belt wheel 19 is connected to the upper end of an output shaft of the variable frequency motor 18, a large belt wheel 20 is also arranged at the top end of the connecting shaft 13 extending out of the upper surface of the end cover 11, and a transmission belt 21 is arranged between the large belt wheel 20 and the small belt wheel 19. The raw liquid tank 12 can rotate in the end cover 11 through the driving action of the variable frequency motor 18 and the transmission action between the belt pulley and the belt.

Finally, a feed pipe 22 extending into the end cover 11 is connected to the end cover, the inner end of the feed pipe 22 is arranged above the stock solution tank 12, and the soybean lecithin purified solution is fed into the stock solution tank 12 under the guiding action of the feed pipe 22. In addition, the upper end of the end cover 11 is connected with a negative pressure air pipe 23, the negative pressure air pipe 23 is connected with a negative pressure air pump, the thin film evaporator shell 1 can be pumped to a vacuum state through the negative pressure air pipe 23 before concentration, and meanwhile, steam can be sucked away in the evaporation and concentration process.

Example 2

Example 2 discloses a membrane evaporation and concentration device of soybean lecithin purified liquid improved based on example 1, and the same points of example 2 and example 1 are not described again, except that the example 2 arranges the membrane evaporator shell 1 in sections, the upper section of the membrane evaporator shell 1 is a cylindrical first outer shell 101, and the lower end is a second outer shell 102 which is wide at the upper part and narrow at the lower part and takes the shape of a circular truncated cone. Wherein the first outer shell 101 and the second outer shell 102 can be formed by integral welding, or the two can be fixedly connected by a flange piece to form the whole thin film evaporator shell 1. When the first outer shell 101 and the second outer shell 102 are connected through a flange member, the jacket 2 provided on the outer surface of the thin film evaporator shell 1 is also provided in a segmented manner, and the two jackets 2 are respectively provided on the outer surfaces of the first outer shell 101 and the second outer shell 102.

Meanwhile, according to the structural design of the thin film evaporator shell 1, the strip scraper 10 connected to the lower end of the rotating rod 7 is obliquely arranged so that the strip scraper 10 is attached to the inner wall of the second outer shell 102. By changing the completely straight-tube type thin film evaporator shell 1 into a structure formed by connecting the first outer shell 101 and the second outer shell 102, when the soybean lecithin purified liquid flows into the inner wall of the second outer shell 102 along the inner wall of the first outer shell 101, the flow speed of the whole purified liquid is slowed, the flowing and evaporating time of the purified liquid on the second outer shell 102 can be prolonged, and the concentration effect on the purified liquid is better.

Meanwhile, the invention also discloses a method for purifying and concentrating soybean lecithin by using the evaporation and concentration device disclosed in the embodiment 1 or the embodiment 2 (namely the specific using steps of the embodiment 1 and the embodiment 2), which comprises the following steps:

the method comprises the following steps: and (3) inputting the soybean lecithin extracting solution obtained through the steps of deoiling, extracting, separating, adsorbing and filtering into a raw liquid tank through a feeding pipe for treatment.

Step two: heating heat conducting oil to 110-130 ℃, injecting the heat conducting oil into the jacket to heat the shell of the thin film evaporator, monitoring the temperature of the heat conducting oil in the jacket in real time through a temperature sensor, pumping the shell of the thin film evaporator to a negative pressure state of-0.05 to-0.03 MPa, and continuously pumping in the subsequent concentration process to keep the negative pressure.

Step three: and starting the driving device to enable the raw liquid tank to rotate in the end cover at a rotating speed of 80-150 r/min, and enabling the sealing piston in the liquid discharge pipe to move outwards due to the action of centrifugal force when the raw liquid tank rotates, so that a liquid discharge hole at the lower end of the liquid discharge pipe is opened, and soybean lecithin extracting solution in the raw liquid tank is thrown out of the liquid discharge hole and falls on the conical inner wall of the end cover.

Step four: and the soybean lecithin extracting solution flowing down along the conical inner wall of the end cover flows downwards along the inner wall of the shell of the thin film evaporator, is completely coated on the inner wall and slowly flows downwards under the action of the spiral blade scraper and the strip scraper in the downward flowing process, is subjected to temperature rise evaporation, and is finally discharged from the lower end.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.