阅读说明：本技术 一种溶剂脱油装置及方法 (Solvent deoiling device and method ) 是由 李俊诚 周岩 钱震 苗恒 菅青娥 马国清 郑会月 郭良兰 王海国 高源� 解利军 于 2019-09-24 设计创作，主要内容包括：一种溶剂脱油装置和方法,所述装置包括：脱油原料罐、溶剂罐、脱油塔以及溶剂和蜡下油收集罐,所述脱油原料罐和所述溶剂罐分别与所述脱油塔的入口相连,所述脱油塔的底部设置有滤网,所述脱油塔的出口连接至溶剂和蜡下油收集罐,所述脱油塔的外壁有加热冷却夹套。本发明操作简单,成本低,适应性广泛,溶剂回收率和脱油效率高。(A solvent deoiling apparatus and method, the apparatus comprising: deoiling head tank, solvent jar, deoiling tower and solvent and wax oil collecting tank, deoiling head tank with the solvent jar respectively with the entry of deoiling tower links to each other, the bottom of deoiling tower is provided with the filter screen, the exit linkage of deoiling tower to solvent and wax oil collecting tank, the outer wall of deoiling tower has the heating cooling jacket. The method has the advantages of simple operation, low cost, wide adaptability, high solvent recovery rate and high deoiling efficiency.)

1. A solvent deoiling apparatus comprising: deoiling head tank, solvent jar, deoiling tower and solvent and wax oil collecting tank, deoiling head tank with the solvent jar respectively with the entry of deoiling tower links to each other, the bottom of deoiling tower is provided with the filter screen, the exit linkage of deoiling tower to solvent and wax oil collecting tank, the outer wall of deoiling tower has the heating cooling jacket.

2. The solvent deoiling device of claim 1, wherein the number of the deoiling towers is multiple, and the plurality of the deoiling towers are arranged in parallel.

3. The solvent deoiling device of claim 1, wherein a blind plate is further arranged at the bottom of the deoiling tower, and the blind plate and the filter screen can be switched with each other; preferably, the deoiling tower is further provided with a stirrer.

4. The solvent deoiling apparatus of claim 1, further comprising a solvent recovery unit for separating the solvent and the undersea oil collected in the solvent and undersea oil collection tank and recovering the solvent.

5. The solvent deoiling device of claim 1, wherein the solvent recovery unit comprises a rectifying tower, a first heating kettle, a wax oil collecting tank and a solvent collecting tank, wherein the first heating kettle is positioned at the bottom of the rectifying tower and is connected with the solvent and the wax oil collecting tank, and an outlet of the rectifying tower is respectively connected with the wax oil collecting tank and the solvent collecting tank.

6. The solvent deoiling apparatus of claim 1, further comprising a second buffer tank and a second vacuum pump, wherein the solvent and paraffin oil collecting tank is connected to one end of the second buffer tank, and the other end of the second buffer tank is connected to the second vacuum pump.

7. The solvent deoiling apparatus of claim 1, further comprising a safety gas unit for providing a safety gas to the deoiling tower and the deoiling feed tank.

8. A solvent deoiling method using the solvent deoiling apparatus of any one of claims 1 to 7, comprising:

introducing the raw material wax and a solvent into a deoiling tower for mixing, heating to 60-200 ℃ to dissolve the raw material wax, uniformly stirring at-40-60 ℃, and then performing solvent deoiling treatment.

9. The solvent deoiling method of claim 8, wherein the solvent comprises one or more of butanone, methyl isobutyl ketone, benzene, toluene; preferably, the volume ratio of the raw material wax to the solvent is 1: 6-10, such as 1: 7, 1: 8 or 1: 9.

10. The solvent deoiling method according to claim 8, further comprising a solvent recovering step comprising rectifying the oil-containing solvent at 20-180 ℃.

Technical Field

The invention belongs to the technical field of chemical industry, and particularly relates to a solvent deoiling device and method.

Background

In the process of petroleum refining, after light fuel oil components such as gasoline, coal, diesel oil and the like are separated, high-wax distillate oil, residual oil and the like are obtained. Wherein the high wax fraction is capable of separating paraffins and base oils by solvent or refrigeration, and the resulting paraffins also contain 1% to 5% of "oils", the inclusion of these residual oils in the paraffin wax lowering the melting point of the paraffin wax, softening it and imparting an oily odor to the wax. This gives the paraffin wax a very wide range of applications, with many negative properties, even affecting its use.

The existing solvent deoiling device has high cost, large device volume and general deoiling effect. The classical deoiling process, which has been known in the industry for many years, is known as "sweating". The vertical sweating method has the advantages of no solvent, simple process, capability of producing various grades of paraffin simultaneously, lower processing cost and the like, and is an innovation compared with the disc sweating method. However, the method is still operated intermittently, the investment is high, the steel consumption is the most, the corrosion is serious (the storage tank is updated every 7 to 8 years), and the average oil content of the finished product is also high.

Large-scale circular sweating boxes and box-type sweating boxes have been designed in existing equipment. The conventional sweating apparatus is a room or oven in which 10 to 15 or more horizontal trays are stacked, each tray having a metal mesh and a drain tube at the bottom to control the paraffin to solidify on the metal mesh, and then the temperature of the whole sweating chamber is raised at a rate of 1 ℃ per hour, at which time oil droplets seep from the surface of the wax, run through the mesh and flow out through the drain tube, the temperature rises to 3-5 ℃ below the melting point of the paraffin, and sweating is stopped, typically to reduce the oil content to below 1%. The sweating equipment is simple in structure, but low in efficiency, and the whole sweating equipment is heated by the heating pipes on the four walls of the oven, so that the equipment is large in size, occupies a large area, and is low in unit volume yield.

Technical terms:

deoiling wax: the wax obtained by cold pressing or solvent dewaxing has an oil content of about ten percent, and when commercial paraffin wax is manufactured, the oil needs to be removed, and the process is called wax deoiling.

Solvent deoiling:

the mixed solvent has different dissolving capacities on oil and wax in the raw materials, the solvent is added successively in the cooling process of the raw materials, the viscosity of the raw materials is reduced, the fluidity of the raw materials is improved, a proper condition is created for wax crystallization, the wax is formed into uniform and compact crystals, the oil and the wax are conveniently separated by a filtering method, and the wax is dissolved by the solvent, so that the oil content in the wax is further reduced. And respectively sending the filtrate, the wax liquid and the wax oil liquid which are separated by filtration to a recovery system, and recovering the solvent for recycling by utilizing the boiling point difference of the solvent and the oil, the wax and the wax oil to obtain the oil, the wax and the wax oil from which the solvent is removed.

Disclosure of Invention

In view of the above, the present invention provides a solvent deoiling device and method for improving deoiling efficiency.

In order to achieve the above object, in one aspect, the present invention provides a solvent deoiling apparatus including: deoiling head tank, solvent jar, deoiling tower and solvent and wax oil collecting tank, deoiling head tank with the solvent jar respectively with the entry of deoiling tower links to each other, the bottom of deoiling tower is provided with the filter screen, the exit linkage of deoiling tower to solvent and wax oil collecting tank, the outer wall of deoiling tower has the heating cooling jacket.

In some embodiments, the number of the deoiling towers is multiple, and the plurality of the deoiling towers are arranged in parallel.

In some embodiments, the bottom of the deoiling tower is further provided with a blind plate, and the blind plate and the filter screen can be switched with each other.

In some embodiments, the deoiling tower is further provided with an agitator.

In some embodiments, the solvent deoiling apparatus further comprises a solvent recovery unit for separating the solvent and the wax oil collected in the solvent and wax oil collection tank and recovering the solvent.

In some embodiments, the solvent recovery unit comprises a rectification tower, a first heating kettle, a wax oil collecting tank and a solvent collecting tank, wherein the first heating kettle is located at the bottom of the rectification tower and is connected with the solvent and the wax oil collecting tank, and the outlet of the rectification tower is respectively connected with the wax oil collecting tank and the solvent collecting tank.

In some embodiments, the solvent deoiling device further comprises a second buffer tank and a second vacuum pump, the solvent and paraffin oil collecting tank is connected with one end of the second buffer tank, and the other end of the second buffer tank is connected with the second vacuum pump.

In some embodiments, the solvent deoiling apparatus further comprises a safety gas unit for providing safety gas to the deoiling tower and the deoiling feed tank.

In another aspect, the present invention provides a solvent deoiling method using the solvent deoiling apparatus, including:

introducing the raw material wax and a solvent into a deoiling tower for mixing, heating to 60-200 ℃ to dissolve the raw material wax, uniformly stirring at-40-60 ℃, and then performing solvent deoiling treatment.

In some embodiments, the solvent comprises one or more of butanone, methyl isobutyl ketone, benzene, toluene.

In some embodiments, the volume ratio of the feedstock wax to the solvent is 1: 6 to 10, such as 1: 7, 1: 8, or 1: 9.

In some embodiments, the method further comprises a solvent recovery step comprising rectifying the oil-containing solvent at 20 to 180 ℃.

Compared with the prior art, the invention can solve the problems of complex operation, large occupied area, low deoiling rate and the like of the existing equipment. The device can reduce the floor area of equipment, improve the oil yield and yield of unit volume, has simple operation, low cost, wide adaptability, high solvent recovery rate which is more than 70 percent and high deoiling efficiency, can deoil the oil content to be less than 0.5 percent, and can process and produce high-quality wax products through subsequent working sections to meet the requirements of various industries.

Drawings

FIG. 1 is a schematic structural diagram of a solvent deoiling device in an embodiment of the present invention.

Description of reference numerals:

10-deoiling raw material tank; 11-solvent tank; 12-a deoiling tower; 13-a temperature control device; 14-a filter screen; 15-solvent and wax oil collection tank; 16-a second buffer tank; 17-a second vacuum pump; 18-a safety gas unit; 19-a first heating kettle; 20-a wax oil collection tank; 21-a solvent collection tank; 22-a rectification column; 23-a wax collection tank; 24-thermocouple.

Detailed Description

In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.

As shown in fig. 1, the embodiment of the present invention provides a solvent deoiling device, which changes a conventional sweating room or an oven room into a tubular deoiling tower, and reduces the floor area of a unit deoiling device.

The solvent deoiling device in the embodiment of the invention comprises a deoiling raw material tank 10, a solvent tank 11, a deoiling tower 12, a solvent and undersea oil collecting tank 15, a second buffer tank 16, a second vacuum pump 17 and a safety gas unit 18.

The deoiling raw material tank 10 is used for accommodating a raw material to be deoiled, and may be provided with a heating unit, such as an electric heating unit or a heat transfer oil heating unit, the solvent tank 11 is used for accommodating a deoiling solvent, the deoiling raw material tank 10 and the solvent tank 11 are respectively connected to the deoiling tower 12, the safety gas unit 18 is used for supplying safety gas to the deoiling tower 12 and the deoiling raw material tank 10 for pressurization or purging, and the safety gas unit 18 may include an air pump or a gas steel cylinder.

The outer wall of the deoiling tower 12 is provided with a heating and cooling jacket, the heating and cooling jacket is connected with a temperature control device 13 and used for heating or cooling the deoiling tower, the bottom of the deoiling tower 12 is provided with a filter screen 14 (the filter screens with various meshes can be freely matched), and the outlet of the deoiling tower 12 is connected to a solvent and wax oil collecting tank 15 and used for collecting the solvent and wax oil in the deoiling process. The de-oiled wax is transferred to a wax collection tank 22. The solvent and wax oil collecting tank 15 is connected with a second buffer tank 16, the second buffer tank 16 is connected with a second vacuum pump 17, and the second buffer tank 16 is used for preventing the collected solvent and wax oil from entering the second vacuum pump 17.

An agitator may also be provided in the deoiling tower 12. The bottom of the deoiling tower 12 can also be provided with a blind plate, and the two filter screens and the blind plate are connected in a triangular manner and can be switched with each other. Wherein the screen is used to separate the wax crystals from the de-oiling solvent. The blind plate is used for sealing the bottom of the deoiling tower, so that the deoiling solvent can fully dissolve the oil in the wax. When the bottom of the deoiling tower is switched to the blind plate, the device is in the deoiling solvent for washing and dissolving the oil in the wax, and when the bottom of the deoiling tower is switched to the filter screen, the device is in the vacuum state, and the oil under the wax is separated from the deoiled wax.

The number of the deoilers 12 may be one or more according to production needs, for example, fig. 1 includes 3 deoilers connected in parallel.

The solvent recovery unit comprises a rectifying tower 22, a first heating kettle 19, a wax oil collecting tank 20 and a solvent collecting tank 21, wherein the first heating kettle 19 is positioned at the bottom of the rectifying tower 22 and is connected with the solvent and wax oil collecting tank 15 for heating the collected solvent and wax oil, and a stirrer can be arranged in the first heating kettle 19. The heated solvent and wax oil are separated by a rectifying tower 22 and are respectively conveyed into a wax oil collecting tank 20 and a solvent collecting tank 21.

Thermocouples 24 may be provided on the piping downstream of the deoiled feed tank 10, the wax holding tank 22, and the wax holding tank 22 for monitoring the temperature in real time. The piping downstream of the wax collection tank 22 is also preferably provided with heating tape and insulation.

The solvent deoiling device can be used for deoiling the raw material wax to be less than or equal to 0.5 wt%, and the raw material wax can be prepared by molecular distillation or purchased in the market.

The operating conditions for solvent deoiling are as follows: mixing raw material wax and one or more deoiling solvents (butanone, MIBK (methyl isobutyl ketone), benzene, toluene and the like) according to a volume ratio of 1: 8, heating to 60-200 ℃ for dissolving, mechanically stirring at a stirring speed of 80-160 r/min at-40-60 ℃, deoiling in a solvent deoiling tower after the mixture is in a uniform mixed state, and adding the deoiling solvent for washing for many times in the process.

The operating conditions of the solvent recovery unit were: adding the mixed solvent with oil into a solvent recovery tower, and rectifying at the set temperature of 20-180 ℃ in the tower kettle.

By utilizing the device and the method, the deoiled wax can be used as a raw material to be subjected to fractional crystallization treatment, and high-purity wax products with different brands can be obtained.

For example, in some embodiments, the low oil product wax is further subjected to fractional crystallization, and then fractional recrystallization is carried out to obtain different grades of products according to the melting point difference (if necessary, hydrodecolorization and deodorization are carried out, for example, products or raw materials with odor grade being more than or equal to 4 are subjected to hydrotreating); and then high-quality wax products are obtained after clay refining and mechanical impurity removal. The high-quality wax product can be used for different fields of product wax according to different purposes. For example: cosmetic waxes, candle waxes, phase change waxes, asphalt modified waxes, and the like. The solvent and the wax oil are subjected to solvent recovery and wax oil collection through a solvent recovery unit, wherein the wax oil can be used as other chemical raw materials such as high-quality lubricating oil base oil and the like.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.