阅读说明：本技术 一种提取罐罐内压力控制装置及方法与应用 (Device and method for controlling pressure in extraction tank and application ) 是由 赵晓辉 林志展 崔阳 黄焕霞 高荣斌 邱烜 刘德晨 李君霞 于 2021-07-30 设计创作，主要内容包括：本发明涉及中药提取装置技术领域,具体提供一种提取罐罐内压力控制装置及方法。所述提取罐罐内压力控制装置包括提取罐,所述提取罐采用夹套加热提取,所述夹套由加热回流罐提供蒸汽,所述提取罐顶部有放空阀；所述加热回流罐用于加热蒸汽,冷却器,用于将蒸汽液化储存,并为加热回流罐提供蒸汽；所述夹套包括蒸汽入口,所述蒸汽入口处有射流结构,所述射流结构有球形腔室,所述球形腔室表面有射流孔,所述球形腔室与入口相对的一侧有开口。解决现有技术中中药提取的实际工业生产过程中压力难以控制,导致药物中有效成分未被提取出来的问题。(The invention relates to the technical field of traditional Chinese medicine extraction devices, and particularly provides a device and a method for controlling pressure in an extraction tank. The pressure control device in the extraction tank comprises an extraction tank, the extraction tank is heated and extracted by adopting a jacket, steam is provided by a heating reflux tank through the jacket, and an emptying valve is arranged at the top of the extraction tank; the heating reflux tank is used for heating steam, and the cooler is used for liquefying and storing the steam and providing the steam for the heating reflux tank; the jacket comprises a steam inlet, a jet structure is arranged at the steam inlet, the jet structure is provided with a spherical chamber, a jet hole is formed in the surface of the spherical chamber, and an opening is formed in one side, opposite to the inlet, of the spherical chamber. Solves the problem that the pressure is difficult to control in the actual industrial production process of extracting the traditional Chinese medicine in the prior art, so that the effective components in the medicine are not extracted.)

1. The device for controlling the pressure in the extraction tank is characterized by comprising the extraction tank (6), wherein the extraction tank (6) is heated and extracted by adopting a jacket (7), the jacket (7) is used for providing steam by a heating reflux tank (5), and the top of the extraction tank (6) is provided with an emptying valve (8);

the heating reflux tank (5) is used for heating steam,

a cooler (4) for storing the steam in a liquefied state and supplying the steam to the heating reflux tank (5);

the jacket (7) comprises a steam inlet, a jet structure is arranged at the steam inlet, the jet structure is provided with a spherical chamber (51), jet holes (52) are formed in the surface of the spherical chamber (51), and an opening (55) is formed in one side, opposite to the inlet, of the spherical chamber (51).

2. The apparatus for controlling the pressure in a container as claimed in claim 1, wherein said spherical chamber (51) has a plurality of fluidic channels (53) therein, said plurality of fluidic channels (53) being arranged radially along the inlet of the spherical chamber (51);

or the steam cooling device also comprises a primary cooler (2), wherein the primary cooler (2) is arranged in front of the cooler (4) and is used for primarily cooling the steam.

3. An apparatus as claimed in claim 1, wherein the extraction tank (6) further comprises agitation means.

4. A method for controlling the pressure in an extraction tank, which is performed in the apparatus for controlling the pressure in an extraction tank according to any one of claims 1 to 3, comprising the steps of: adjusting the pressure in the extraction tank (6), opening a top vent valve (8) for adjustment when the pressure is high, introducing part of steam in a jacket (7) into a heating reflux tank (5) for heating when the pressure is low, then introducing the part of steam into the jacket (7) until the pressure in the extraction tank (6) reaches a preset range, and then placing the solution to be extracted into the extraction tank (6).

5. The method for controlling the pressure in the extracting tank as claimed in claim 4, further comprising the steps of: before the process is started, the process temperature in the extraction tank (6) is obtained, the temperature in the heating reflux tank (5) is set as the process temperature, steam is continuously introduced into the heating reflux tank (5) from the cooler (4) until the steam is saturated, then a valve between the cooler (4) and the heating reflux tank (5) is closed, the heating reflux tank (5) is relatively closed, and then the temperature in the heating reflux tank (5) is raised.

6. The method for controlling the pressure in the extracting tank as claimed in claim 5, further comprising the steps of: in the temperature rising process of the heating reflux tank (5), a valve between the heating reflux tank (5) and the extraction tank (6) is opened, and the steam in the heating reflux tank (5) is continuously introduced into the extraction tank (6) until the steam in the heating reflux tank (5) is emptied.

7. The method for controlling the pressure in the extracting tank as claimed in claim 4, further comprising the steps of: when the process is finished, steam in the jacket (7) is discharged into the primary cooler (2) through the feed inlet (1) for primary cooling, then enters the cooler (4) through the discharge pipe (3), and is stored in the cooler (4).

8. A method for extracting a Chinese medicinal composition, which is carried out in the device for controlling the pressure in the extraction tank of any one of claims 1 to 3, comprising the steps of:

1) adding pure water into the extraction tank (6);

2) controlling the pressure of the extraction tank (6):

adding the traditional Chinese medicine composition into pure water in an extraction tank (6) to prepare feeding, presetting the steam pressure in a jacket (7), opening an emptying valve (8) at the top of the extraction tank (6) when the pressure in the extraction tank (6) is greater than the preset pressure, and feeding when the pressure in the extraction tank (6) is reduced to the preset pressure;

when the pressure of the extraction tank (6) is lower than the preset pressure, a valve between the heating reflux tank (5) and the jacket (7) is opened, part of steam in the jacket (7) is introduced into the heating reflux tank (5) for reflux, and then the steam is introduced into the heating reflux tank (5) again until the pressure in the extraction tank reaches the preset pressure, and the valve is closed;

3) control of the steam pressure in the jacket (7):

before the process starts, preparing to obtain the extraction temperature of the traditional Chinese medicine composition, setting the temperature in the heating reflux tank (5) as the extraction temperature, continuously introducing steam into the heating reflux tank (5) from the cooler (4) until the steam is saturated, then closing a valve between the cooler (4) and the heating reflux tank (5) to relatively seal the heating reflux tank (5), and then raising the temperature in the heating reflux tank (5);

the sequence of the steps 1), 2) and 3) can be changed, wherein the steps 1) and 3) can be carried out simultaneously.

9. The method for extracting a Chinese medicinal composition according to claim 8, wherein the size of the heating reflux drum (5) is much smaller than that of the extraction drum (6), the amount of steam required for saturated steam in the jacket at the extraction temperature is calculated, then the steps of maintaining saturated steam in the heating reflux drum (5), raising the temperature, releasing steam, and introducing steam again are repeated until the amount of steam reaches the required amount of steam.

10. The method for extracting a Chinese medicinal composition according to claim 8,

the Chinese medicinal composition comprises radix Puerariae and radix Paeoniae alba;

or, the extraction temperature is 65 deg.C, and the preset pressure is 0.03-0.05 Mpa.

Technical Field

The invention relates to the technical field of traditional Chinese medicine extraction devices, and particularly provides a device and a method for controlling pressure in an extraction tank and application of the device and the method.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The chemical components of the traditional Chinese medicine are very complex, and not only contain various effective components, but also have ineffective components and also contain toxic components. Extracting the effective components of the effective monomers, and further separating and purifying the effective components to obtain the effective monomers is an important content in the research field of traditional Chinese medicines. The extraction of the traditional Chinese medicine is to extract the effective components in the traditional Chinese medicine to the maximum extent by utilizing certain technologies, so that the internal quality and the clinical treatment effect of the traditional Chinese medicine preparation are improved, and the effect of the traditional Chinese medicine is exerted to the maximum extent.

Therefore, the extraction of effective components in traditional Chinese medicines is particularly important, in the prior art, the extraction of the effective components in the traditional Chinese medicines is related to pressure, if the pressure cannot be maintained stably, the effective components in the traditional Chinese medicines cannot be extracted, and further, the medicinal value cannot be realized.

Disclosure of Invention

Aiming at the problem that the pressure is difficult to control in the actual industrial production process of extracting the traditional Chinese medicine in the prior art, so that the effective components in the medicine are not extracted.

In one or some embodiments of the invention, the pressure control device in the extraction tank comprises the extraction tank, the extraction tank is heated and extracted by adopting a jacket, steam is provided by a heating reflux tank, and an emptying valve is arranged at the top of the extraction tank;

the heating reflux tank is used for heating steam,

the cooler is used for liquefying and storing the steam and providing the steam for the heating reflux tank;

the jacket comprises a steam inlet, a jet structure is arranged at the steam inlet, the jet structure is provided with a spherical chamber, a jet hole is formed in the surface of the spherical chamber, and an opening is formed in one side, opposite to the inlet, of the spherical chamber.

In one or some embodiments of the present invention, there is provided an extraction tank internal pressure control method performed in the extraction tank internal pressure control device described above, including the steps of: adjusting the pressure in the extraction tank, opening a top vent valve for adjustment when the pressure is high, introducing part of steam in the jacket into the heating reflux tank for heating when the pressure is low, then introducing the part of steam into the jacket until the pressure in the extraction tank reaches the expected range, and then placing the solution to be extracted into the extraction tank.

In one or some embodiments of the present invention, a method for extracting a traditional Chinese medicine composition is provided, where the method is performed in the pressure control device in the extraction tank, and includes the following steps:

1) adding pure water into the extraction tank;

2) controlling the pressure of the extraction tank:

adding the traditional Chinese medicine composition into the pure water in the extraction tank, preparing for feeding, presetting the steam pressure in the jacket, opening an emptying valve at the top of the extraction tank when the pressure in the extraction tank is greater than the preset pressure, and feeding when the pressure in the extraction tank is reduced to the preset pressure;

when the pressure of the extraction tank is lower than the preset pressure, a valve between the heating reflux tank and the jacket is opened, part of steam in the jacket is introduced into the heating reflux tank for reflux, and then the steam is introduced into the heating reflux tank again until the pressure in the extraction tank reaches the preset pressure, and the valve is closed;

3) control of steam pressure within the jacket:

before the process starts, preparing to obtain the extraction temperature of the traditional Chinese medicine composition, setting the temperature in the heating reflux tank as the extraction temperature, continuously introducing steam into the heating reflux tank by a cooler until the heating reflux tank is saturated, then closing a valve between the cooler and the heating reflux tank to relatively seal the heating reflux tank, and then increasing the temperature in the heating reflux tank;

the sequence of the steps 1), 2) and 3) can be changed, wherein the steps 1) and 3) can be carried out simultaneously.

One or some of the above technical solutions have the following advantages or beneficial effects:

1) the invention provides a set of pressure control device in an extraction tank, which is used for controlling the pressure in the extraction tank.

2) According to the invention, the jet structure is reasonably designed at the inlet of the jacket, the shape of the jet structure can meet the requirement that steam can quickly form turbulent flow inside and outside the spherical cavity, so that the steam is driven to quickly diffuse to the whole jacket, and on the other hand, when the steam is extracted, negative pressure is quickly formed at the opening of the spherical cavity, so that the steam is promoted to quickly enter the spherical cavity.

3) The invention also provides a pressure control method of the extraction tank, which judges whether the steam temperature in the jacket is proper or not according to the initial pressure of the extraction tank. The superheat of the initial steam is adjusted to be appropriate for the solution to be extracted, so that the situation that the pressure or the temperature in the extraction tank cannot reach a set value due to overhigh or overlow temperature of the superheated steam is avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.

FIG. 1 is a diagram of an apparatus for controlling the pressure in an extraction tank according to an embodiment of the present invention;

FIG. 2 is a schematic view of a steam inlet configuration according to an embodiment of the present invention;

FIG. 3 is a sectional view of a steam inlet structure according to an embodiment of the present invention;

fig. 4 is a bottom view of a steam inlet structure according to an embodiment of the present invention.

Wherein: 1. a feed inlet; 2. a primary cooler; 3. a discharging pipe; 4. a cooler; 5. heating the reflux tank; 51. a spherical chamber; 52. a jet hole; 53. a fluidic channel; 54. a sawtooth structure; 55. an opening; 6. an extraction tank; 7. a jacket; 8. and (4) an emptying valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

Aiming at the problem that the pressure is difficult to control in the actual industrial production process of extracting the traditional Chinese medicine in the prior art, so that the effective components in the medicine are not extracted.

The inventor finds that although the method can control the pressure in the extraction tank, the steam in the jacket is superheated steam, and the heat exchange quantity between the steam in the jacket and the extraction tank cannot be controlled, so that only an exhaust valve of the extraction tank is opened or steam is introduced into the jacket, although the pressure in the extraction tank can be maintained within a proper range, the corresponding heat exchange conditions are correspondingly changed, namely the superheat quantity of the steam is changed, the subsequent temperature in the extraction tank is also changed, and the pressure is changed again, so that the pressure needs to be monitored all the time.

In this regard, as shown in fig. 1, in one or some embodiments of the present invention, there is provided an extraction tank pressure control device, comprising an extraction tank 6, wherein the extraction tank 6 is heated and extracted by a jacket 7, the jacket 7 is provided with steam by a heating reflux tank 5, and the top of the extraction tank 6 is provided with a blow valve 8;

the heating reflux drum 5 is used for heating steam,

a cooler 4 for storing the vapor in a liquefied state and supplying the vapor to the heating reflux drum 5;

as shown in fig. 2 to 4, the jacket 7 comprises a steam inlet, the steam inlet is provided with a jet structure, the jet structure is provided with a spherical chamber 51, the surface of the spherical chamber 51 is provided with jet holes 52, and the side of the spherical chamber 51 opposite to the inlet is provided with an opening 55.

The inlet of the jacket 7 is provided with a jet structure, so that the requirement of rapid filling of steam in the jacket 7 can be met, and because the pressure of the extraction tank 6 needs to be adjusted at the beginning in the process, the steam needs to be rapidly diffused in the jacket 7 and needs to be diffused towards multiple directions, so that the steam is prevented from being locally high in temperature in the jacket 7, and the steam can be diffused in the spherical cavity 51 and then diffused into the whole jacket 7 along the jet holes 52.

The invention provides a set of pressure control device in an extraction tank, which is used for controlling the pressure in the extraction tank.

Preferably, a plurality of jet flow channels 53 are arranged in the spherical chamber 51, and the plurality of jet flow channels 53 are radially arranged along the inlet of the spherical chamber 51;

the steam can be rapidly dispersed into the spherical chamber along the jet channel 53, and the wider the jet channel near the edge, the slower the flow velocity, and the steam exiting from the jet hole 51 achieves a rapid turbulence, rapidly spreading throughout the jacket 7.

In addition, an air pump is arranged between the heating reflux tank 5 and the jacket 7, when steam needs to be extracted from the jacket 7 into the heating reflux tank 5, the steam enters the spherical chamber 51 through the jet holes 52, and because the steam enters the spherical chamber 51 as a plurality of strands of steam, the steam is mixed in the spherical chamber 51, and rapidly enters the heating reflux tank 5 in cooperation with the jet flow channel 53, a negative pressure environment is formed at the opening 55, and the steam is sucked into the spherical chamber 51 from the jacket 7.

The tail end of the jet flow channel 53 is of a sawtooth structure 54, so that quick flow disturbance is facilitated.

Preferably, a primary cooler 2 is included, which primary cooler 2 precedes the cooler 4 for primary cooling of the steam. The purpose of the initial cooling is to avoid steam from directly entering the cooler 4 and causing cracking. Typically, incipient cooling does not result in liquefaction of the vapor.

Preferably, the extraction tank 6 further comprises a stirring device.

In one or some embodiments of the present invention, there is provided an extraction tank internal pressure control method performed in the extraction tank internal pressure control device described above, including the steps of: adjusting the pressure in the extraction tank 6, opening the top vent valve 8 for adjustment when the pressure is high, introducing part of steam in the jacket 7 into the heating reflux tank 5 for heating when the pressure is low, then entering the jacket 7 until the pressure in the extraction tank 6 reaches the expected range, and then placing the solution to be extracted into the extraction tank 6.

The control principle is as follows: the heat exchange mode of the extraction tank 6 is that the jacket 7 exchanges heat, steam is arranged in the jacket 7, the steam temperature is high, the pressure is high, the temperature in the extraction tank 6 is high, the pressure is high, the steam temperature is low, the pressure is low, and the reverse is true.

Therefore, at first preset the interior steam pressure of jacket 7, make steam pressure reach a definite value, nevertheless steam is superheated steam usually, and the more saturated steam heat transfer effect of superheated steam is better, if the temperature is too high, then draw jar 6 internal pressure too big, need the evacuation partly, owing to carried out the evacuation to drawing jar 6, consequently, superheated steam and the partial heat of treating that the extract carries out the heat transfer have carried out the evacuation, and the heat of remaining superheated steam can satisfy and draws the demand in drawing jar 6.

On the contrary, if the pressure in the extraction tank 6 is too low, the steam pressure in the jacket 7 is preset, so that the steam pressure in the jacket 7 is constant and only can be superheated steam with lower temperature, and at this time, part of the steam is heated, so that the superheated steam can meet the extraction requirement of the extraction tank 6.

Preferably, the method further comprises the following steps: before the process is started, the process temperature in the extraction tank 6 is obtained, the temperature in the heating reflux tank 5 is set to be the process temperature, steam is continuously introduced into the heating reflux tank 5 from the cooler 4 until the steam is saturated, then a valve between the cooler 4 and the heating reflux tank 5 is closed, the heating reflux tank 5 is relatively closed, and then the temperature in the heating reflux tank 5 is raised.

The control principle is as follows: and obtaining the extraction temperature, the heating steam is higher than the temperature, the superheated steam has good heat exchange effect, and in order to ensure that the steam is superheated steam, the steam is firstly ensured to be saturated steam, so that the temperature of the heating reflux tank 5 is controlled to be constant, the steam is introduced to be saturated, and the steam is superheated steam after being reheated.

Preferably, the method further comprises the following steps: in the temperature rising process of the heating reflux tank 5, a valve between the heating reflux tank 5 and the extraction tank 6 is opened, so that the steam in the heating reflux tank 5 is continuously introduced into the extraction tank 6 until the steam in the heating reflux tank 5 is emptied.

Preferably, the method further comprises the following steps: when the process is finished, steam in the jacket 7 is discharged into the primary cooler 2 through the feed inlet 1, is subjected to primary cooling, then enters the cooler 4 through the discharge pipe 3, and is stored in the cooler 4.

During the production of the Mingren Jingtong tablets (applied patent CN03112032.6), the inventor needs to decoct the kudzu root and the white peony root and extract the filtrate, however, the concentration difference in the filtrate is large, and the effect on the drug effect is large, so the inventor tries to provide a method capable of stabilizing the extraction concentration of each component in the filtrate.

In one or some embodiments of the present invention, a method for extracting a traditional Chinese medicine composition is provided, where the method is performed in the pressure control device in the extraction tank, and includes the following steps:

1) adding pure water into the extraction tank 6;

2) controlling the pressure of the extraction tank 6:

adding the Chinese medicinal composition into pure water in the extraction tank 6, preparing for feeding, presetting the steam pressure in the jacket 7, opening the vent valve 8 at the top of the extraction tank 6 when the pressure in the extraction tank 6 is greater than the preset pressure, and feeding when the pressure in the extraction tank 6 is reduced to the preset pressure;

when the pressure of the extraction tank 6 is lower than the preset pressure, a valve between the heating reflux tank 5 and the jacket 7 is opened, part of steam in the jacket 7 is introduced into the heating reflux tank 5 for reflux, and then the steam is introduced into the heating reflux tank 5 again until the pressure in the extraction tank reaches the preset pressure, and the valve is closed;

3) control of steam pressure within the jacket 7:

before the process starts, preparing to obtain the extraction temperature of the traditional Chinese medicine composition, setting the temperature in the heating reflux tank 5 as the extraction temperature, continuously introducing steam into the heating reflux tank 5 from the cooler 4 until the steam is saturated, then closing a valve between the cooler 4 and the heating reflux tank 5 to enable the heating reflux tank 5 to be relatively closed, and then increasing the temperature in the heating reflux tank 5;

the sequence of the steps 1), 2) and 3) can be changed, wherein the steps 1) and 3) can be carried out simultaneously.

From the result, the traditional Chinese medicine composition extracted by the method has small error of purity of multiple batches, and is suitable for industrial application.

Preferably, the size of the heating reflux tank 5 is far smaller than that of the extraction tank 6, the steam amount required by saturated steam in the jacket at the extraction temperature is calculated, then the saturated steam is maintained in the heating reflux tank 5, the temperature is raised, the steam is released, and the step of introducing the steam again is repeated until the steam amount reaches the required steam amount.

Preferably, the traditional Chinese medicine composition is kudzu root and white paeony root;

preferably, the extraction temperature is 65 ℃, and the preset pressure is 0.03-0.05 Mpa. Generally, negative pressure is beneficial to the extraction of the Chinese medicinal composition.

The invention provides a specific embodiment, namely a method for extracting radix puerariae and radix paeoniae alba, which is carried out in the pressure control device in an extraction tank in embodiment 1, and comprises the following steps:

1) adding 1000L of pure water into the extraction tank 6;

2) controlling the pressure of the extraction tank 6:

adding 200kg of radix puerariae and 200kg of radix paeoniae alba into pure water in an extraction tank 6 to prepare for feeding, presetting the steam pressure in a jacket 7, opening an emptying valve 8 at the top of the extraction tank 6 when the pressure in the extraction tank 6 is greater than 0.05Mpa, extracting the extraction tank 6, and feeding when the pressure in the extraction tank 6 is reduced to 0.05 Mpa;

when the pressure of the extraction tank 6 is less than 0.03MPa, a valve between the heating reflux tank 5 and the jacket 7 is opened, part of steam in the jacket 7 is introduced into the heating reflux tank 5 for reflux, and then the steam is introduced into the heating reflux tank 5 again until the pressure in the extraction tank reaches 0.03MPa, and the valve is closed.

The control principle is as follows: the heat exchange mode of the extraction tank 6 is that the jacket 7 exchanges heat, steam exists in the jacket 7, the steam temperature is high, the pressure is high, the temperature in the extraction tank 6 is high, the pressure is high, the steam temperature is low, the pressure is low, and the reverse is true

Consequently, at first predetermine the interior steam pressure of jacket 7, make steam pressure reach a definite value, nevertheless steam is superheated steam usually, and superheated steam is better than saturated steam heat transfer effect, if the temperature is too high, then extract jar 6 internal pressure too big, need the evacuation partly, owing to carried out the evacuation to extracting jar 6, consequently, superheated steam and the partial heat that pure water carried out the heat transfer have carried out the evacuation, and the heat of remaining superheated steam can satisfy and extracts the demand in extracting jar 6.

On the contrary, if the pressure in the extraction tank 6 is too low, the steam pressure in the jacket 7 is preset, so that the steam pressure in the jacket 7 is constant and only can be superheated steam with lower temperature, and at this time, part of the steam is heated, so that the superheated steam can meet the extraction requirement of the extraction tank 6.

The main purpose of controlling the pressure in the extraction tank 6 is to determine whether the steam temperature in the jacket 7 is proper or not by the initial pressure of the extraction tank 6.

3) Control of steam pressure within the jacket 7:

when the process is finished, in order to avoid long-term steam corrosion in the jacket 7, steam in the jacket 7 is discharged into the primary cooler 2 through the feed inlet 1 for primary cooling, then enters the cooler 4 through the discharge pipe 3, and is stored in the cooler 4.

The purpose of the initial cooling is to avoid steam from directly entering the cooler 4 and causing cracking.

Before the process begins, preparation is carried out, the extraction temperature of the radix puerariae and radix paeoniae alba composition is obtained to be 65 ℃, the temperature in the heating reflux tank 5 is set to be 65 ℃, steam is continuously introduced into the heating reflux tank 5 from the cooler 4 until the heating reflux tank is saturated, then a valve between the cooler 4 and the heating reflux tank 5 is closed, the heating reflux tank 5 is relatively closed, and then the temperature in the heating reflux tank 5 is raised.

In the temperature rising process of the heating reflux tank 5, a valve between the heating reflux tank 5 and the extraction tank 6 is opened, so that the steam in the heating reflux tank 5 is continuously introduced into the extraction tank 6 until the steam in the heating reflux tank 5 is emptied.

The control principle is as follows: obtain root of kudzu vine root white peony extraction temperature, then heating steam should be higher than this temperature, and superheated steam heat transfer is effectual, for guaranteeing that steam is superheated steam, then should guarantee steam earlier for saturated steam, consequently, the temperature of control heating reflux tank 5 is invariable, lets in steam to saturation, and reheating, then steam is superheated steam.

The size of the heating reflux tank 5 is far smaller than that of the extraction tank 6, if the volume of a jacket in the extraction tank 6 is large, the step 3) is repeatedly carried out for multiple times, namely, the required steam amount of saturated steam in the jacket at 65 ℃ is calculated firstly, then the saturated steam is maintained in the heating reflux tank 5, the temperature is increased, the steam is discharged, and the step of introducing the steam again is repeatedly carried out until the steam amount reaches the required steam amount.

It should be noted that the above steps 1), 2), and 3) can be reversed, wherein the steps 1) and 3) can be performed simultaneously.

Through tests, the error of the mass concentration of the radix puerariae and the radix paeoniae alba extracted in multiple continuous batches in the embodiment is not more than 2.5%.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.