CN1022291C - Adsorption-distillation separation method - Google Patents
Adsorption-distillation separation method Download PDFInfo
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- CN1022291C CN1022291C CN 92102546 CN92102546A CN1022291C CN 1022291 C CN1022291 C CN 1022291C CN 92102546 CN92102546 CN 92102546 CN 92102546 A CN92102546 A CN 92102546A CN 1022291 C CN1022291 C CN 1022291C
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Abstract
The present invention relates to a separation method of a liquid mixture. The method integrates the advantages of adsorption separating method and a distillation separating method, so that the adsorption process and the distillation process are simultaneously carried out in the same tower device, and the mass transport of a gas phase, a liquid phase and a solid phase are continuously realized. The present invention is particularly suitable for the separation of liquid mixtures with similar azeotrope and boiling points, can obtain a high-purity product of one component in the mixture which is hard to be separated, and can be widely applied to the separation engineering of industries, such as chemical industry, medicine, food, etc.
Description
The invention belongs to the continuous separation method of liquid mixture.
Absorption and distillation are two independently separation unit operation.Advantages such as to have disposal ability big in distillation, and the simple and process of equipment is continuous are widely used in production fields such as chemical industry.But its energy consumption is bigger, and not being suitable for separating has azeotropic mixture or the close system of boiling point, and product purity is not high enough; Absorption has the separation factor height, energy consumption is low and the high advantage of product purity.But because of the cause that adsorbent need be regenerated, operation is difficult to serialization.At present, the alternate application distillation has the report that difficult separation mixture separates with adsorption separating method: Liquid mixture separation by combined adsorption and rectification, Ger.DE 3712291(CIB01D3/32), 27, Oct.1988, Appl.10, Apr.1987.But this is absolutely not continuous adsorption and the distillation procedure that carries out simultaneously in same equipment.
The purpose of this invention is to provide a kind of adsorption-distillation separation method.This method is specially adapted to the separation of the close liquid mixture of azeotropic mixture or boiling point.
Key problem in technology of the present invention is a gas-liquid-solid three-phase mass transfer of realizing continuous, multistage and adverse current in same tower, makes absorption and distills two separation processes and carry out simultaneously.For guaranteeing the enforcement of this key technology of the present invention, the concrete technical measures that adopted are, first, the liquid mixture that separates enters in the tower from the middle part of adsorptive distillation tower continuously, second, in the tower charging, solid absorbent is mixed into slurry with the desorbing agent liquid-carrier and enters in the tower from the top of adsorptive distillation tower continuously, the 3rd, in order to guarantee recycling of adsorbent, the saturated adsorbent that has adsorbed a certain component with the adsorptive distillation Tata at the bottom of high boiling component liquid together go the desorption device to carry out desorption process, adsorbent behind the desorption enters the adsorptive distillation tower with desorbing agent again, the 4th, desorbing agent can be selected the high boiling component in institute's separating liquid mixture for use, or selects for use a kind of boiling point to be higher than the neat liquid of all components boiling point in institute's separating liquid, the 5th, the net product of the low boiling component in the liquid mixture is from the adsorptive distillation cat head, through the continuous extraction of condenser.
This flow process realizes that to three component fluids mixtures the adsorptive distillation separation process is: establish liquid mixture to be separated and be made up of A, B and C component, its boiling point is T in proper order
A＜T
B＜T
C, and A component and the B component can form azeotropic mixture or boiling point is close.This mixture is imported in the tower continuously by adsorptive distillation tower middle part certain position, imports a certain amount of adsorbent that can select to adsorb the B component continuously at tower top certain position simultaneously.In the adsorptive distillation tower, because the effect of distillation, A component and part B component be to the cat head enrichment, C component and the enrichment at the bottom of tower of most of B component.Adsorbent flows downward in the process mutually with liquid in tower, selects absorption B component.By condenser, can obtain high-purity A component product at cat head continuously, at the bottom of tower, adsorb B component and the adsorbent that reaches capacity and B and C component, be admitted in the desorption device 4.In the desorption device, utilize the C component adsorbent that has adsorbed the B component to be carried out distillation desorption as desorbing agent, obtain B component product by desorption device top, obtain C component product in desorption device bottom.For the ease of carrying the solid absorbent of having regenerated, utilize portion C component product as adsorbing agent carrier, form slurry with adsorbent, import again in the adsorptive distillation tower, reach the purpose that recycles adsorbent.
Adopt flow process of the present invention to realize that the adsorptive distillation separation process of binary liquid mixture is: establish liquid mixture to be separated and form, need at this moment to select that a kind of pure component liquid C is double does desorbing agent and carrier, and boiling point to be in proper order: T by A component and B component
A＜T
B＜T
C, its method of operating is identical with separating three component fluids mixtures, and the result can obtain pure component A product at the adsorptive distillation cat head, can obtain B component product on desorption device top, and C component double as desorbing agent and liquid-carrier recycle with adsorbent.
The advantage such as the present invention has products of separated purity height, energy consumption is low, operation is continuous, equipment is simple and treating capacity is big. The present invention is particularly suitable for the separation of the close liquid mixture of azeotropic mixture in the production fields such as chemical industry, medicine, food or boiling point.
The present invention is for separating of ethanol-water mixture, and alcohol product purity reaches 99.9%.
Claims (4)
1, a kind of separating azeotrope or close liquid mixture adsorption distillating method of boiling point of being used for, it is to finish in the separator that is made of reboiler, adsorptive distillation tower, condenser and continuous still desorption device, it is characterized in that, in the adsorptive distillation tower, realize absorption and distillation procedure simultaneously, comprise step:
A, the liquid mixture that will separate enter in the tower at the middle part of adsorptive distillation tower continuously;
B, with the charging time, solid absorbent is mixed into slurry with double as desorbing agent liquid-carrier and enters in the tower continuously from adsorptive distillation tower top behind the distillation desorption in-situ regeneration;
The net product of c, a certain difficult low boiling component of separating is from the adsorptive distillation cat head, through the continuous extraction of condenser;
D, the high boiling component that is enriched at the bottom of the adsorptive distillation Tata are together sent into the distillation desorption device continuously with the saturated adsorbent that has adsorbed a certain component.
2, by the said adsorptive distillation method of claim 1, it is characterized in that, the liquid-carrier of selected double as desorbing agent can be the high boiling component in institute's separating liquid mixture, or another boiling point be higher than the neat liquid of all components boiling point in institute's separating liquid.
3, by the said adsorptive distillation method of claim 2, it is characterized in that double as desorbing agent and liquid-carrier recycle in piece-rate system.
4, by the said adsorptive distillation method of claim 1, it is characterized in that adsorbent recycles in piece-rate system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102546 CN1022291C (en) | 1992-04-17 | 1992-04-17 | Adsorption-distillation separation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102546 CN1022291C (en) | 1992-04-17 | 1992-04-17 | Adsorption-distillation separation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1064224A CN1064224A (en) | 1992-09-09 |
| CN1022291C true CN1022291C (en) | 1993-10-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92102546 Expired - Fee Related CN1022291C (en) | 1992-04-17 | 1992-04-17 | Adsorption-distillation separation method |
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| Country | Link |
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| CN (1) | CN1022291C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1298811C (en) * | 2004-12-10 | 2007-02-07 | 天津大学 | Dewatering method of fusel oil in production of aclohol fuel |
| DE102005013030A1 (en) * | 2005-03-22 | 2006-09-28 | Bayer Technology Services Gmbh | Process for the distillative purification of low-volatile fluids |
| PT103325B (en) * | 2005-07-26 | 2008-08-27 | Partex Services Portugal Servi | PROCESS FOR SEPARATING LIQUIDS IN EMULSION IN MIXTURES OF LIQUIDS AND GASES DISSOLVED IN MIXTURES OF LIQUIDS AND GASES BY LOCALIZED PRESSURE REDUCTION AND DEVICE FOR CARRYING OUT THE PROCESS |
| TWI398291B (en) * | 2010-12-13 | 2013-06-11 | Ind Tech Res Inst | Method and device for recycling liquid crystal alignment solution |
| JP2023540227A (en) * | 2020-08-26 | 2023-09-22 | 中国石油化工股▲ふん▼有限公司 | Composite adsorbent and its application for separating ethylbenzene by adsorption distillation |
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1992
- 1992-04-17 CN CN 92102546 patent/CN1022291C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1064224A (en) | 1992-09-09 |
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