CN2741630Y - Device for recovering solvent by dewatering and desalination from mixed liquid - Google Patents
Device for recovering solvent by dewatering and desalination from mixed liquid Download PDFInfo
- Publication number
- CN2741630Y CN2741630Y CNU2004200805939U CN200420080593U CN2741630Y CN 2741630 Y CN2741630 Y CN 2741630Y CN U2004200805939 U CNU2004200805939 U CN U2004200805939U CN 200420080593 U CN200420080593 U CN 200420080593U CN 2741630 Y CN2741630 Y CN 2741630Y
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- China
- Prior art keywords
- solvent
- communicating pipe
- desalination
- mixed liquor
- outlet
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Abstract
The utility model relates to a device for recovering solvent by dewatering and desalination from mixed liquid apparatus. Two distillation towers are erectly installed parallelly, the lower part is provided with a screw conveyer, a Y-shaped communicating tube is used to make the materials outlets on the bottom of the two towers connected, and the other downward connector of the y-shaped communicating pipe is connected with the inlet of the screw conveyer. The inlet of the mixed liquor is arranged on the central position of one distillation tower, salts separated out by distillation enters the screw conveyer from the Y-shaped communicating pipe, and the other downward connector of the y-shaped communicating pipe is further lead outside and collected. In this way, distillation separation and crystallization separation are combined together. Material transfer and separation can be carried out simultaneously in the device, which realizes that dewatering, desalination and recovering solvent are completed in one step, and simplifies the recovery technology of the solvent in complicated system. Continuous operations can be carried out, the utility model is of low operation cost and high efficiency. The technical proposal is suitable for separating and recovering high boiling solvents of polyhydric alcohol, sulfoxide, pyrrolidone, acidamide, etc, from aqueous and saliferous solvent.
Description
Technical field
The utility model relates to solvent recovery unit, relates in particular to the device that the desalination that need dewater from mixed liquor reclaims solvent.
Background technology
Finish or keep reacting balance for the promotion chemical reaction in the Chemical Manufacture, usually make auxiliary agent with solvent, as: use dimethyl formamide to do in the phthalimide production and use the N-methyl pyrrolidone to make solvent etc. in solvent, the aramid fiber polycondensation reaction, after course of reaction finished, solvent was through recycling use.Generally speaking, the component more complicated that contains the mixed liquor of solvent to be recycled, when producing aramid fiber, the recovery solution that forms through rinsing after polycondensation reaction finishes, wherein except containing solvent---also contain a large amount of water and salt the N-methyl pyrrolidone, form " solvent-salt-water " mixed system.The boiling point of N-methyl pyrrolidone is higher than water in this mixed liquor, has compatibility between other component in it and the mixed liquor, and separation process generates with crystallization, has hindered the separation and the recovery of solvent, can not be simply mode by distillation reclaim.Recovery to this solvent is actually: the polynary processing procedure of remove moisture, discharge salinity, impurity separating.
In the prior art, French dust is owed the husband oil company at Chinese patents (application number: ZL92112093.1) adopt electrodialysis desalination and then distillating recovering solvent for the saliferous aqueous solution; The patent ZL 95102183.4 of Beijing Yanshan Petrochemical research institute application to producing the solvent in the aramid fiber process, adopts anhydrous vacuum distillation mode to reclaim.
Recovery technology does not have innovation because device is gone up routinely, many, the artificial dependency degree of operational sequence is big in the recovery dissolving agent process, has a large amount of salt to exist in addition, has influence on the material transmission when separating, generally can only adopt intermittent mode to handle, reclaim, the organic efficiency of solvent is low.
Summary of the invention
The purpose of this utility model is exactly in order to solve the above-mentioned problems in the prior art, provide a kind of have shift and the separation of material function, can be from mixed liquor the disposable device of finishing dehydration, desalination, three kinds of operations of recovery solvent.
The purpose of this utility model realizes by following technical solution:
A kind of desalination that dewaters from mixed liquor reclaims the device of solvent, its two destilling tower parallel upright are installed, its below is provided with a double helix conveyer, the bottom material outlet of two towers connects by two adapters of Y type communicating pipe epimere, and an other adapter of Y type communicating pipe hypomere links to each other with the inlet of auger conveyor; The inlet of mixed liquor is arranged on the wherein centre position of a destilling tower, and the top of this destilling tower is a steam outlet, and the top of an other destilling tower is the outlet of fractionation recovered solvent, and the outlet of auger conveyor is for distilling the outlet of the salt of separating out.
The purpose of this utility model can also further realize by following optimal technical scheme:
Aforementioned from mixed liquor the dehydration desalination reclaim the device of solvent, wherein the angle α of the center line of the tube connector of the bottom material outlet of Y type communicating pipe and two destilling towers and horizontal direction is 45 °≤α＜90 °.
The aforementioned desalination that dewaters from mixed liquor reclaims the device of solvent, and wherein Y type communicating pipe equates preferred 45 °, 60 °, 75 ° of α with the center line of the tube connector of the bottom material outlet of two destilling towers with the angle α of horizontal direction.
The aforementioned desalination that dewaters from mixed liquor reclaims the device of solvent, the joint portion, center of wherein said Y type communicating pipe is a hollow ball, sphere has circular hole three positions, respectively with three directions on adapter coupling lead to, the nominal diameter of described three direction upper connecting tubes all is not less than DN100.
The aforementioned desalination that dewaters from mixed liquor reclaims the device of solvent, and the center of circle of wherein said three circular holes and the centre of sphere of hollow ball are in the same plane.
Adopt technical solutions of the utility model can play following technique effect:
(1) separated and Crystallization Separation are combined, carrying out material in newly-designed device simultaneously shifts and separates, realize that dehydration, desalination, recovery solvent one go on foot and finish, simplified the removal process of solvent in the complex system, can carry out continuous operation, running cost is low, efficient is high, is applicable to separate high boiling solvents such as reclaiming polyalcohol, sulfoxide, pyrrolidones, acid amides from moisture saline solns.
(2) ingenious, reasonable, the science of device design, two destilling tower bottoms adopt heavy caliber, high inclination-angle Y-piece road to be communicated with, and the salinity of having avoided crystallizing out forms obstruction in pipeline, can handle the high solution of salt content; And two towers lead to mutually, and solution can flow naturally, help the solution smooth transfer, have simplified the inter process linking.The hollow ball structure is adopted in the joint portion, center of Y type communicating pipe, more helps material and shifts and separate, and the operational stability of device further improves.
Description of drawings
Fig. 1 is the utility model structural representation.Wherein, the 1, the 2nd, destilling tower, the 3rd, Y type communicating pipe, the 4th, auger conveyor, the 5th, entry to mixed solution, the 6th, low boiling component outlet, the 7th, the high boiling component outlet, the 8th, the crystal salt outlet, α is two destilling tower bottom material outlets and the adapter center line of Y type communicating pipe and the angle of horizontal direction.
The specific embodiment
The utility model is installed two destilling tower parallel upright, and the below is provided with a double helix conveyer, with Y type communicating pipe the bottom material outlet with two towers couple together, the downward adapter in the other place of Y type communicating pipe links to each other with the inlet of auger conveyor; The inlet of mixed liquor is arranged on the wherein centre position of a destilling tower, the top of this destilling tower is a steam outlet, the top of an other destilling tower is the outlet of fractionation recovered solvent, the salt that distillation is separated out is drawn and is collected from the outlet of auger conveyor then from Y type communicating pipe entering auger conveyor.It is moisture separate to reclaim, high boiling solvent is a background in the saliferous multicomponent solution, many at operating procedure in the prior art, can only clearance-type handle or the like deficiency, design the device that a kind of brand-new dehydration desalination reclaims solvent, realization dehydration, desalination, a plurality of processes of recovery solvent are finished in once-through operation simultaneously, can realize serialization processing processing, play the good technical effect.
Below in conjunction with Figure of description technical solutions of the utility model are described in further detail.
As Fig. 1, the primary structure that the utility model reclaims solvent device is: two destilling towers 1 and 2 parallel upright are installed, the below is provided with a double helix conveyer 4, with Y type communicating pipe 3 the bottom material outlet with two towers couple together, the downward adapter in the other place of Y type communicating pipe 3 links to each other with the inlet of auger conveyor 4; The inlet 5 of mixed liquor is arranged on the centre position of destilling tower 1, the top of this destilling tower is low boiling component (steam) outlet 6, the top of an other destilling tower 2 is high boiling component (fractionation recovered solvent) outlets 7, the salinity that distillation is separated out is drawn and is collected from the outlet 8 of auger conveyor then from Y type communicating pipe 3 entering auger conveyor 4.For keeping the normal running of material in the destilling tower 2, outlet 8 should be higher than the liquid level in the destilling tower 2.
This device realizes that the essence that multicomponent separates is: water takes distillating method to separate with solvent, and salinity is to take out with the form of crystalline solid, and this three finishes by two destilling towers and a double helix conveyer respectively.The setting of Y type communicating pipe, will dewater distillation and solvent distill two parts and are combined as a whole, play from destilling tower 1 to the inside liquid level of destilling tower 2 delivered solution, two towers of balance, compile crystal salt and realize effects such as liquid-solid precipitate and separate.
Be the assurance device continuous operation, prevent the salinity blocking pipe that crystallization is separated out, help the transfer of mixed solution between two destilling towers in the separation of salinity and the processing procedure, can be made the form of heavy caliber, wide-angle Y type communicating pipe, the nominal diameter of its communicating pipe on three directions all is not less than DN100, and symmetric form such as can make with the center line of the tube connector of the bottom material outlet of two destilling towers and the angle α of horizontal direction, between 45 °～90 °, preferred 45 °, 60 °, 75 °.The joint portion, center of Y type communicating pipe can be designed to the hollow ball form, the home position of its communicating pipe perforate on sphere on three directions, can be arranged within the same cutting plane through the hollow ball centre of sphere, like this, can play better effect feed separation and transfer.
Because the purpose of destilling tower 1 is to dewater, the purpose of destilling tower 2 is to reclaim solvent, and the boiling point of solvent is higher than water, therefore, the former control temperature will be lower than the latter during practical operation.
Be specific embodiment with the N-methyl pyrrolidone aqueous solution of handling saliferous below, method of operating of the present utility model and effect are further specified.
The boiling point of N-methyl pyrrolidone is 202 ℃, contains N-methyl pyrrolidone 20Wt% (weight concentration, down together) in the pending mixed solution approximately, salt 2%, and surplus is a water.
After the charging, if destilling tower 1 still liquid temp is 150 ℃, solution is concentrated, N-methyl pyrrolidone concentration is greater than 90%, overhead distillate is a water, and purity is greater than 99.8% (content of N-methyl pyrrolidone is less than 0.2%), and most of salt is sunken at the bottom of the still with crystal form, fall within Y type communicating pipe, and then enter auger conveyor and drawn and collect.
The solution that is concentrated at the bottom of destilling tower 1 still enters destilling tower 2 through Y type communicating pipe 3, this concentrate is further heated to 210 ℃, the content of N-methyl pyrrolidone is greater than 90% in the distillate, and newly-generated crystal salt enters Y type communicating pipe at the bottom of being deposited on still, is drawn and collects equally.
Those of ordinary skills can know by inference, and the control temperature of above destilling tower 1 reboiler directly has influence on the concentration of the central solvent to be recycled of its tower still solution, and the maximum allowable operating temperature (M.A.O.T.) of destilling tower 1 tower still solution should be lower than the boiling point of solvent to be recycled.In the above-mentioned specific embodiment, following corresponding relation is arranged between this temperature and the concentration under the normal pressure:
| The operating temperature of destilling tower 1 tower still solution | 150℃ | 180℃ | 200℃ |
| The concentration of N-methyl pyrrolidone in the destilling tower 1 tower still solution | ＞90％ | ＞93％ | ＞95％ |
Claims (5)
- One kind from mixed liquor the dehydration desalination reclaim the device of solvent, it is characterized in that: two destilling tower parallel upright are installed, its below is provided with a double helix conveyer, the bottom material outlet of two towers connects by two adapters of Y type communicating pipe epimere, and an other adapter of Y type communicating pipe hypomere links to each other with the inlet of auger conveyor; The inlet of mixed liquor is arranged on the wherein centre position of a destilling tower, and the top of this destilling tower is a steam outlet, and the top of an other destilling tower is the outlet of fractionation recovered solvent, and the outlet of auger conveyor is for distilling the outlet of the salt of separating out.
- 2. as claimed in claim 1 from mixed liquor the dehydration desalination reclaim the device of solvent, it is characterized in that: the center line of the tube connector of the bottom material outlet of Y type communicating pipe and two destilling towers and the angle α of horizontal direction are 45 °≤α＜90 °.
- 3. the desalination that dewaters from mixed liquor as claimed in claim 2 reclaims the device of solvent, and it is characterized in that: Y type communicating pipe equates with the angle α of horizontal direction with the center line of the tube connector of the bottom material outlet of two destilling towers, is 45 °, 60 °, 75 °.
- 4. the desalination that dewaters from mixed liquor as claimed in claim 1 reclaims the device of solvent, it is characterized in that: the joint portion, center of described Y type communicating pipe is a hollow ball, sphere has circular hole three positions, respectively with three directions on adapter coupling lead to, the nominal diameter of described three direction upper connecting tubes all is not less than 100 millimeters.
- 5. the desalination that dewaters from mixed liquor as claimed in claim 4 reclaims the device of solvent, and it is characterized in that: the center of circle of described three circular holes and the centre of sphere of hollow ball are in the same plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200805939U CN2741630Y (en) | 2004-10-28 | 2004-10-28 | Device for recovering solvent by dewatering and desalination from mixed liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200805939U CN2741630Y (en) | 2004-10-28 | 2004-10-28 | Device for recovering solvent by dewatering and desalination from mixed liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2741630Y true CN2741630Y (en) | 2005-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2004200805939U Expired - Lifetime CN2741630Y (en) | 2004-10-28 | 2004-10-28 | Device for recovering solvent by dewatering and desalination from mixed liquid |
Country Status (1)
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| CN (1) | CN2741630Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381795A (en) * | 2011-09-09 | 2012-03-21 | 湘潭大学 | Separation and extraction method for caprolactam, cyclohexane carboxylic acid, cyclohexane carboxylic sulfonic acid and organic oil in waste liquid generated in caprolactam production by toluene method |
| CN103446882A (en) * | 2013-09-05 | 2013-12-18 | 中国大唐集团环境技术有限公司 | Crystal cleaning device for pyrolysis chamber of selective catalytic reduction (SCR) urea denitration equipment |
-
2004
- 2004-10-28 CN CNU2004200805939U patent/CN2741630Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381795A (en) * | 2011-09-09 | 2012-03-21 | 湘潭大学 | Separation and extraction method for caprolactam, cyclohexane carboxylic acid, cyclohexane carboxylic sulfonic acid and organic oil in waste liquid generated in caprolactam production by toluene method |
| CN103446882A (en) * | 2013-09-05 | 2013-12-18 | 中国大唐集团环境技术有限公司 | Crystal cleaning device for pyrolysis chamber of selective catalytic reduction (SCR) urea denitration equipment |
| CN103446882B (en) * | 2013-09-05 | 2015-02-11 | 中国大唐集团环境技术有限公司 | Crystal cleaning device for pyrolysis chamber of selective catalytic reduction (SCR) urea denitration equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20141028 Granted publication date: 20051123 |