CN115531904A - Process for purifying NMP from waste stripping liquid - Google Patents
Process for purifying NMP from waste stripping liquid Download PDFInfo
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- CN115531904A CN115531904A CN202211353195.9A CN202211353195A CN115531904A CN 115531904 A CN115531904 A CN 115531904A CN 202211353195 A CN202211353195 A CN 202211353195A CN 115531904 A CN115531904 A CN 115531904A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
- B01D3/146—Multiple effect distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
- B01D3/148—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step in combination with at least one evaporator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/003—Filters in combination with devices for the removal of liquids
- B01D36/006—Purge means
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D207/18—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member
- C07D207/22—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D207/24—Oxygen or sulfur atoms
- C07D207/26—2-Pyrrolidones
- C07D207/263—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms
- C07D207/267—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to the ring nitrogen atom
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Abstract
The invention discloses a process for purifying NMP in waste stripping liquid, which comprises a filtering unit, an evaporation unit, a dehydration unit, a light component removal unit, a product rectification unit and a storage unit. The invention separates and filters impurities in stripping liquid through the filtering unit, extracts waste water in the stripping liquid through the dehydration unit so as to be convenient for later purification, separates light components from heavy components through the light component removal unit, adopts the reboiler and the condenser, and separates light components from heavy components through the rectification separation unit, adopts the reboiler and the condenser, separating NMP and heavy components, and then can obtain the higher NMP of purity fast, accomplish the purification to NMP, solved and generally can retrieve purification NMP to the stripping solution in lithium cell manufacturing plant to convenient to use, but the purity that NMP required in the electron trade can be very high, consequently, the problem that stable efficient stripping solution purification process has extremely important effect to NMP's recycle.
Description
Technical Field
The invention relates to the technical field of purification of a stripping solution NMP, in particular to a process for purifying NMP in a waste stripping solution.
Background
The stripping agent can strip organisms and slime generated by the organisms from the metal surface of heat exchange equipment or the wall of a cooling tower, the using amount of electronic chemicals is greatly increased along with the rapid development of the photoelectric industry, NMP is a polar aprotic solvent, has the advantages of high boiling point, strong specificity, low toxicity, low volatility, excellent chemical stability and thermal stability, strong dissolving capacity, recyclability and the like, is an indispensable organic solvent in the lithium battery industry, and is uniformly coated on a metal base material in a stable thickness by taking the NMP as a main liquid carrier of slurry in the coating link of the production of a lithium battery positive plate, and the NMP has good wettability and fluidity with the metal base material.
NMP also exists in the stripping solution, and the NMP is generally recovered and purified from the stripping solution in a lithium battery production plant so as to be convenient to use, but the purity required by the NMP in the electronic industry is very high, so that the stable and efficient purification process of the stripping solution plays an extremely important role in the recovery and utilization of the NMP, and therefore a process for purifying the NMP from the waste stripping solution is provided to solve the problem.
Disclosure of Invention
The invention aims to provide a process for purifying NMP from waste stripping liquid, which has the advantage of facilitating the purification of NMP from the stripping liquid, and solves the problem that the NMP is recovered and purified from the stripping liquid in a lithium battery production plant so as to be convenient to use, but the purity required by the NMP in the electronic industry is very high, so that the stable and efficient purification process of the stripping liquid plays an extremely important role in the recovery and utilization of the NMP.
In order to achieve the purpose, the invention provides the following technical scheme: a process for purifying NMP from waste stripping liquid comprises a filtering unit, an evaporation unit, a dehydration unit, a light component removal unit, a product rectification unit and a storage unit, wherein the purification process comprises the following steps:
filtration unit-evaporation unit-dehydration unit-lightness removing unit-product rectification unit-storage unit
A. A filtering unit: firstly, the stripping liquid is transmitted into a raw material tank, and impurities in the stripping liquid are separated and filtered through the raw material tank, so that the impurities in the waste stripping liquid are primarily filtered, and the later-stage processing is facilitated;
B. an evaporation unit: and D, conveying the stripping liquid raw material filtered in the step A into a forced circulation evaporator through a feed pump, evaporating residual liquid through the operation of the forced circulation evaporator, separating heavy components in the stripping liquid and evaporated gas-phase materials, and directly conveying the heavy components and the evaporated gas-phase materials to a dehydration unit.
C. A dehydration unit: and D, conveying the heavy component separated in the step B and the evaporated gas phase material to the bottom of a dehydration and rectification tower, introducing the ascending gas phase into a condenser through the dehydration and rectification tower, condensing to extract wastewater, and enabling a tower kettle of the dehydration and rectification tower to mainly have the light component, NMP and the heavy component.
D. A light component removal unit: c, transmitting the light components, NMP and heavy components which are mainly possessed by the tower kettle of the dehydration rectifying tower in the step C into a light component removal rectifying tower, heating the materials into a gas phase through a tower kettle reboiler, ascending the gas phase to a condenser, transmitting the liquid phase which flows back in the rectifying tower of the light component removal rectifying tower and the ascending gas phase to heat transfer in the rectifying tower of the light component removal rectifying tower, separating the light components from the heavy components, further extracting the light components from the top of the light component removal rectifying tower, and at the moment, mainly possessing the NMP and the heavy components in the tower kettle of the light component removal rectifying tower;
E. a rectification separation unit: d, conveying the NMP and the heavy components in the tower kettle of the light component removal rectifying tower in the step D into a product rectifying tower, heating the materials into a gas phase in the product rectifying tower through a tower kettle reboiler, enabling the gas phase to ascend to a condenser, transferring the liquid phase refluxed in the product rectifying tower and the ascending gas phase to heat transfer in the product rectifying tower, further separating the NMP from the heavy components, and finishing the purification of the NMP;
F. a storage unit: and E, extracting an unqualified product containing a small amount of light components from the top of the product rectifying tower in the step E, extracting heavy components from the bottom of the product rectifying tower and transmitting the heavy components to a storage tank, then extracting a qualified NMP product from the side line of the product rectifying tower, and directly transmitting the NMP product to a product tank for storage after detection.
Preferably, the raw material tank mentioned in the step A comprises a coarse sieve filter screen and a fine sieve filter screen.
Preferably, the waste stripping solution mentioned in step A consists of (dimethyl sulfoxide) DMSO 3-5% (N-methylpyrrolidone) NMP90% water 3-5% heavy component 3-5%.
Preferably, the forced circulation evaporator in step B is circulated by using an external power, and the solution is forced to evaporate through the heating pipe in one direction at a speed of 2-5m/s by using a pump.
Preferably, the model of the condenser in the step C is v21.
Preferably, the reboiler mentioned in step E is of the type ISO9001.
Compared with the prior art, the invention has the following beneficial effects:
the device is used for separating and filtering impurities in stripping liquid through the filtering unit, so that the later-stage processing is facilitated, the quality of later-stage purification can be improved, the wastewater in the stripping liquid is extracted through the dewatering unit, the later-stage purification is facilitated, the light components and the heavy components are separated through the light component removing unit by adopting the reboiler and the condenser, the light components can be extracted from the top of the light component removing rectifying tower, the NMP and the heavy components are separated through the rectifying and separating unit by adopting the reboiler and the condenser, the NMP with higher purity can be quickly obtained, the purification of the NMP is completed, the NMP product at the purification position is stored through the storage unit by adopting the product tank, the later-stage use is facilitated, and the problem that the NMP is generally recovered and purified from the stripping liquid in a lithium battery production plant so as to be convenient to use but the purity required in the electronic industry is very high is solved, so that the stable and efficient purification process of the stripping liquid plays an extremely important role in the recovery and utilization of the NMP.
Drawings
FIG. 1 is a schematic view of the purification process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1, a process for purifying NMP from waste stripping solution includes a filtering unit, an evaporation unit, a dehydration unit, a light component removal unit, a product rectification unit and a storage unit, wherein the purification process comprises the following steps:
filtration unit-evaporation unit-dehydration unit-lightness-removing unit-product rectification unit-storage unit
A. A filtering unit: firstly, the stripping liquid is conveyed into a raw material tank, and impurities in the stripping liquid are separated and filtered through the raw material tank, so that the impurities in the waste stripping liquid are preliminarily filtered, and the later-stage processing is facilitated;
B. an evaporation unit: and D, conveying the stripping liquid raw material filtered in the step A into a forced circulation evaporator through a feed pump, evaporating residual liquid through the operation of the forced circulation evaporator, separating heavy components in the stripping liquid and evaporated gas-phase materials, and directly conveying the heavy components and the evaporated gas-phase materials to a dehydration unit.
C. A dehydration unit: and D, conveying the heavy component separated in the step B and the evaporated gas phase material to the bottom of a dehydration and rectification tower, introducing the ascending gas phase into a condenser through the dehydration and rectification tower, condensing to extract wastewater, and enabling a tower kettle of the dehydration and rectification tower to mainly have the light component, NMP and the heavy component.
D. A light component removal unit: c, transmitting the light components, NMP and heavy components which are mainly possessed by the tower kettle of the dehydration rectifying tower in the step C into a light component removal rectifying tower, heating the materials into a gas phase through a tower kettle reboiler, ascending the gas phase to a condenser, transmitting the liquid phase which flows back in the rectifying tower of the light component removal rectifying tower and the ascending gas phase to heat transfer in the rectifying tower of the light component removal rectifying tower, separating the light components from the heavy components, further extracting the light components from the top of the light component removal rectifying tower, and at the moment, mainly possessing the NMP and the heavy components in the tower kettle of the light component removal rectifying tower;
E. a rectification separation unit: d, conveying the NMP and the heavy components in the tower kettle of the light component removal rectifying tower in the step D into a product rectifying tower, heating the materials into a gas phase in the product rectifying tower through a tower kettle reboiler, enabling the gas phase to ascend to a condenser, transferring the liquid phase refluxed in the product rectifying tower and the ascending gas phase to heat transfer in the product rectifying tower, further separating the NMP from the heavy components, and finishing the purification of the NMP;
F. a storage unit: and E, extracting an unqualified product containing a small amount of light components from the top of the product rectifying tower in the step E, extracting heavy components from the bottom of the product rectifying tower and transmitting the heavy components to a storage tank, then extracting a qualified NMP product from the side line of the product rectifying tower, and directly transmitting the NMP product to a product tank for storage after detection.
Example two:
in the first embodiment, the following steps are added:
the raw material tank mentioned in the step A comprises a coarse screen filter screen and a fine screen filter screen.
The purification process comprises the following steps:
filtration unit-evaporation unit-dehydration unit-lightness removing unit-product rectification unit-storage unit
A. A filtering unit: firstly, the stripping liquid is conveyed into a raw material tank, and impurities in the stripping liquid are separated and filtered through the raw material tank, so that the impurities in the waste stripping liquid are preliminarily filtered, and the later-stage processing is facilitated;
B. an evaporation unit: and D, conveying the stripping liquid raw material filtered in the step A into a forced circulation evaporator through a feed pump, evaporating residual liquid through the operation of the forced circulation evaporator, separating heavy components in the stripping liquid and evaporated gas-phase materials, and directly conveying the heavy components and the evaporated gas-phase materials to a dehydration unit.
C. A dewatering unit: and D, conveying the heavy component separated in the step B and the evaporated gas phase material to the bottom of a dehydration and rectification tower, introducing the ascending gas phase into a condenser through the dehydration and rectification tower, condensing to extract wastewater, and enabling a tower kettle of the dehydration and rectification tower to mainly possess a light component, NMP and the heavy component.
D. A light component removal unit: c, transmitting the light components, NMP and heavy components which are mainly possessed by the tower kettle of the dehydration rectifying tower in the step C into a light component removal rectifying tower, heating the materials into a gas phase through a tower kettle reboiler, ascending the gas phase to a condenser, transmitting the liquid phase which flows back in the rectifying tower of the light component removal rectifying tower and the ascending gas phase to heat transfer in the rectifying tower of the light component removal rectifying tower, separating the light components from the heavy components, further extracting the light components from the top of the light component removal rectifying tower, and at the moment, mainly possessing the NMP and the heavy components in the tower kettle of the light component removal rectifying tower;
E. a rectification separation unit: d, conveying the NMP and the heavy components in the tower kettle of the light component removal rectifying tower in the step D into a product rectifying tower, heating the materials into a gas phase in the product rectifying tower through a tower kettle reboiler, enabling the gas phase to ascend to a condenser, transferring the liquid phase refluxed in the product rectifying tower and the ascending gas phase to heat transfer in the product rectifying tower, further separating the NMP from the heavy components, and finishing the purification of the NMP;
F. a storage unit: and E, extracting an unqualified product containing a small amount of light components from the top of the product rectifying tower in the step E, extracting heavy components from the bottom of the product rectifying tower and transmitting the heavy components to a storage tank, then extracting a qualified NMP product from the side line of the product rectifying tower, and directly transmitting the NMP product to a product tank for storage after detection.
Example three:
in the second embodiment, the following steps are added:
the waste stripping solution mentioned in step A consists of (dimethyl sulfoxide) DMSO 3-5% (N-methylpyrrolidone) NMP90% water 3-5% and heavy component 3-5%.
The purification process comprises the following steps:
filtration unit-evaporation unit-dehydration unit-lightness removing unit-product rectification unit-storage unit
A. A filtering unit: firstly, the stripping liquid is conveyed into a raw material tank, and impurities in the stripping liquid are separated and filtered through the raw material tank, so that the impurities in the waste stripping liquid are preliminarily filtered, and the later-stage processing is facilitated;
B. an evaporation unit: and D, conveying the stripping liquid raw material filtered in the step A into a forced circulation evaporator through a feed pump, evaporating residual liquid through the operation of the forced circulation evaporator, separating heavy components in the stripping liquid and evaporated gas-phase materials, and directly conveying the heavy components and the evaporated gas-phase materials to a dehydration unit.
C. A dehydration unit: and D, conveying the heavy component separated in the step B and the evaporated gas phase material to the bottom of a dehydration and rectification tower, introducing the ascending gas phase into a condenser through the dehydration and rectification tower, condensing to extract wastewater, and enabling a tower kettle of the dehydration and rectification tower to mainly have the light component, NMP and the heavy component.
D. A light component removal unit: c, transmitting the light components, NMP and heavy components which are mainly possessed by the tower kettle of the dehydration rectifying tower in the step C into a light component removal rectifying tower, heating the materials into a gas phase through a tower kettle reboiler, ascending the gas phase to a condenser, transmitting the liquid phase which flows back in the rectifying tower of the light component removal rectifying tower and the ascending gas phase to heat transfer in the rectifying tower of the light component removal rectifying tower, separating the light components from the heavy components, further extracting the light components from the top of the light component removal rectifying tower, and at the moment, mainly possessing the NMP and the heavy components in the tower kettle of the light component removal rectifying tower;
E. a rectification separation unit: d, conveying the NMP and the heavy components in the tower kettle of the light component removal rectifying tower in the step D into a product rectifying tower, heating the materials into a gas phase in the product rectifying tower through a tower kettle reboiler, enabling the gas phase to ascend to a condenser, transferring the liquid phase refluxed in the product rectifying tower and the ascending gas phase to heat transfer in the product rectifying tower, further separating the NMP from the heavy components, and finishing the purification of the NMP;
F. a storage unit: and E, extracting an unqualified product containing a small amount of light components from the top of the product rectifying tower in the step E, extracting heavy components from the bottom of the product rectifying tower and transmitting the heavy components to a storage tank, then extracting a qualified NMP product from the side line of the product rectifying tower, and directly transmitting the NMP product to a product tank for storage after detection.
Example four:
in the third embodiment, the following steps are added:
the forced circulation evaporator in the step B is circulated by using external power, and the solution is forced to pass through a heating pipe for evaporation at the speed of 2-5m/s by using a pump along one direction.
The purification process comprises the following steps:
filtration unit-evaporation unit-dehydration unit-lightness removing unit-product rectification unit-storage unit
A. A filtering unit: firstly, the stripping liquid is conveyed into a raw material tank, and impurities in the stripping liquid are separated and filtered through the raw material tank, so that the impurities in the waste stripping liquid are preliminarily filtered, and the later-stage processing is facilitated;
B. an evaporation unit: and B, conveying the stripping liquid raw material filtered in the step A into a forced circulation evaporator through a feed pump, evaporating residual liquid through the operation of the forced circulation evaporator, separating heavy components in the stripping liquid and evaporated gas-phase materials, and directly conveying the materials to a dehydration unit.
C. A dehydration unit: and D, conveying the heavy component separated in the step B and the evaporated gas phase material to the bottom of a dehydration and rectification tower, introducing the ascending gas phase into a condenser through the dehydration and rectification tower, condensing to extract wastewater, and enabling a tower kettle of the dehydration and rectification tower to mainly have the light component, NMP and the heavy component.
D. A light component removal unit: c, transmitting the light components, NMP and heavy components which are mainly possessed by the tower kettle of the dehydration rectifying tower in the step C into a light component removal rectifying tower, heating the materials into a gas phase through a tower kettle reboiler, ascending the gas phase to a condenser, transmitting the liquid phase which flows back in the rectifying tower of the light component removal rectifying tower and the ascending gas phase to heat transfer in the rectifying tower of the light component removal rectifying tower, separating the light components from the heavy components, further extracting the light components from the top of the light component removal rectifying tower, and at the moment, mainly possessing the NMP and the heavy components in the tower kettle of the light component removal rectifying tower;
E. a rectification separation unit: d, conveying the NMP and the heavy components in the tower kettle of the light component removal rectifying tower in the step D into a product rectifying tower, heating the materials into a gas phase in the product rectifying tower through a tower kettle reboiler, enabling the gas phase to ascend to a condenser, transferring the liquid phase refluxed in the product rectifying tower and the ascending gas phase to heat transfer in the product rectifying tower, further separating the NMP from the heavy components, and finishing the purification of the NMP;
F. a storage unit: and E, extracting an unqualified product containing a small amount of light components from the top of the product rectifying tower in the step E, extracting heavy components from the bottom of the product rectifying tower and transmitting the heavy components to a storage tank, then extracting a qualified NMP product from the side line of the product rectifying tower, and directly transmitting the NMP product to a product tank for storage after detection.
Example five:
in the fourth example, the following steps were added:
the model of the condenser in step C is v21.
The purification process comprises the following steps:
filtration unit-evaporation unit-dehydration unit-lightness removing unit-product rectification unit-storage unit
A. A filtering unit: firstly, the stripping liquid is conveyed into a raw material tank, and impurities in the stripping liquid are separated and filtered through the raw material tank, so that the impurities in the waste stripping liquid are preliminarily filtered, and the later-stage processing is facilitated;
B. an evaporation unit: and B, conveying the stripping liquid raw material filtered in the step A into a forced circulation evaporator through a feed pump, evaporating residual liquid through the operation of the forced circulation evaporator, separating heavy components in the stripping liquid and evaporated gas-phase materials, and directly conveying the materials to a dehydration unit.
C. A dewatering unit: and D, conveying the heavy component separated in the step B and the evaporated gas phase material to the bottom of a dehydration and rectification tower, introducing the ascending gas phase into a condenser through the dehydration and rectification tower, condensing to extract wastewater, and enabling a tower kettle of the dehydration and rectification tower to mainly have the light component, NMP and the heavy component.
D. A light component removal unit: c, transmitting the light components, NMP and heavy components which are mainly possessed by the tower kettle of the dehydration rectifying tower in the step C into a light component removal rectifying tower, heating the materials into a gas phase through a tower kettle reboiler, ascending the gas phase to a condenser, transmitting the liquid phase which flows back in the rectifying tower of the light component removal rectifying tower and the ascending gas phase to heat transfer in the rectifying tower of the light component removal rectifying tower, separating the light components from the heavy components, further extracting the light components from the top of the light component removal rectifying tower, and at the moment, mainly possessing the NMP and the heavy components in the tower kettle of the light component removal rectifying tower;
E. a rectification separation unit: d, conveying the NMP and the heavy components in the tower kettle of the light component removal rectifying tower in the step D into a product rectifying tower, heating the materials into a gas phase in the product rectifying tower through a tower kettle reboiler, enabling the gas phase to ascend to a condenser, transferring the liquid phase refluxed in the product rectifying tower and the ascending gas phase to heat transfer in the product rectifying tower, further separating the NMP from the heavy components, and finishing the purification of the NMP;
F. a storage unit: and E, extracting an unqualified product containing a small amount of light components from the top of the product rectifying tower in the step E, extracting heavy components from the bottom of the product rectifying tower and transmitting the heavy components to a storage tank, then extracting a qualified NMP product from the side line of the product rectifying tower, and directly transmitting the NMP product to a product tank for storage after detection.
Example six:
in the fifth example, the following steps were added:
the reboiler mentioned in step E is of the type ISO9001.
The purification process comprises the following steps:
filtration unit-evaporation unit-dehydration unit-lightness removing unit-product rectification unit-storage unit
A. A filtering unit: firstly, the stripping liquid is conveyed into a raw material tank, and impurities in the stripping liquid are separated and filtered through the raw material tank, so that the impurities in the waste stripping liquid are preliminarily filtered, and the later-stage processing is facilitated;
B. an evaporation unit: and B, conveying the stripping liquid raw material filtered in the step A into a forced circulation evaporator through a feed pump, evaporating residual liquid through the operation of the forced circulation evaporator, separating heavy components in the stripping liquid and evaporated gas-phase materials, and directly conveying the materials to a dehydration unit.
C. A dehydration unit: and D, conveying the heavy component separated in the step B and the evaporated gas phase material to the bottom of a dehydration and rectification tower, introducing the ascending gas phase into a condenser through the dehydration and rectification tower, condensing to extract wastewater, and enabling a tower kettle of the dehydration and rectification tower to mainly have the light component, NMP and the heavy component.
D. A light component removal unit: c, transmitting the light components, NMP and heavy components which are mainly possessed by the tower kettle of the dehydration rectifying tower in the step C into a light component removal rectifying tower, heating the materials into a gas phase through a tower kettle reboiler, ascending the gas phase to a condenser, transmitting the liquid phase which flows back in the rectifying tower of the light component removal rectifying tower and the ascending gas phase to heat transfer in the rectifying tower of the light component removal rectifying tower, separating the light components from the heavy components, further extracting the light components from the top of the light component removal rectifying tower, and at the moment, mainly possessing the NMP and the heavy components in the tower kettle of the light component removal rectifying tower;
E. a rectification separation unit: d, conveying the NMP and the heavy components in the tower kettle of the light component removal rectifying tower in the step D into a product rectifying tower, heating the materials into a gas phase in the product rectifying tower through a tower kettle reboiler, enabling the gas phase to ascend to a condenser, transferring the liquid phase refluxed in the product rectifying tower and the ascending gas phase to heat transfer in the product rectifying tower, further separating the NMP from the heavy components, and finishing the purification of the NMP;
F. a storage unit: and E, extracting an unqualified product containing a small amount of light components from the top of the product rectifying tower in the step E, extracting heavy components from the bottom of the product rectifying tower and transmitting the heavy components to a storage tank, then extracting a qualified NMP product from the side line of the product rectifying tower, and directly transmitting the NMP product to a product tank for storage after detection.
The standard parts used in the present application document can be purchased from the market, and can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts the conventional means of mature bolt, rivet, welding and the like in the prior art, the machines, parts and equipment adopt the conventional models in the prior art, the control mode is automatically controlled by a controller, the control circuit of the controller can be realized by simple programming of technicians in the field, the control circuit belongs to the common knowledge in the field, and the present application document is mainly used for protecting mechanical devices, so the control mode and the circuit connection are not explained in detail in the present application.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A process for purifying NMP in waste stripping liquid comprises a filtering unit, an evaporation unit, a dehydration unit, a light component removal unit, a product rectification unit and a storage unit, wherein the purification process comprises the following steps:
filtration unit-evaporation unit-dehydration unit-lightness-removing unit-product rectification unit-storage unit
A. A filtering unit: firstly, the stripping liquid is conveyed into a raw material tank, and impurities in the stripping liquid are separated and filtered through the raw material tank, so that the impurities in the waste stripping liquid are preliminarily filtered, and the later-stage processing is facilitated;
B. an evaporation unit: and D, conveying the stripping liquid raw material filtered in the step A into a forced circulation evaporator through a feed pump, evaporating residual liquid through the operation of the forced circulation evaporator, separating heavy components in the stripping liquid and evaporated gas-phase materials, and directly conveying the heavy components and the evaporated gas-phase materials to a dehydration unit.
C. A dehydration unit: and D, conveying the heavy component separated in the step B and the evaporated gas phase material to the bottom of a dehydration and rectification tower, introducing the ascending gas phase into a condenser through the dehydration and rectification tower, condensing to extract wastewater, and enabling a tower kettle of the dehydration and rectification tower to mainly possess a light component, NMP and the heavy component.
D. A light component removal unit: c, transmitting the light components, NMP and heavy components which are mainly possessed by the tower kettle of the dehydration rectifying tower in the step C into a light component removal rectifying tower, heating the materials into a gas phase through a tower kettle reboiler, ascending the gas phase to a condenser, transmitting the liquid phase which flows back in the rectifying tower of the light component removal rectifying tower and the ascending gas phase to heat transfer in the rectifying tower of the light component removal rectifying tower, separating the light components from the heavy components, further extracting the light components from the top of the light component removal rectifying tower, and at the moment, mainly possessing the NMP and the heavy components in the tower kettle of the light component removal rectifying tower;
E. a rectification separation unit: d, conveying the NMP and the heavy components in the tower kettle of the light component removal rectifying tower in the step D into a product rectifying tower, heating the materials into a gas phase in the product rectifying tower through a tower kettle reboiler, enabling the gas phase to ascend to a condenser, transferring the liquid phase refluxed in the product rectifying tower and the ascending gas phase to heat transfer in the product rectifying tower, further separating the NMP from the heavy components, and finishing the purification of the NMP;
F. a storage unit: and E, extracting an unqualified product containing a small amount of light components from the top of the product rectifying tower in the step E, extracting heavy components from the bottom of the product rectifying tower and transmitting the heavy components to a storage tank, then extracting a qualified NMP product from the side line of the product rectifying tower, and directly transmitting the NMP product to a product tank for storage after detection.
2. The process of claim 1, wherein the process comprises the steps of: the raw material tank mentioned in the step A comprises a coarse screen filter screen and a fine screen filter screen.
3. The process of claim 1, wherein the process comprises the steps of: the waste stripping solution mentioned in step A consists of 3-5% of (dimethyl sulfoxide) DMSO (N-methylpyrrolidone) NMP90% of water and 3-5% of heavy components.
4. The process of claim 1, wherein the process comprises the steps of: the forced circulation evaporator in the step B is circulated by using external power, and the solution is forced to pass through a heating pipe for evaporation at the speed of 2-5m/s by using a pump along one direction.
5. The process of claim 1, wherein the process comprises the steps of: the model of the condenser in the step C is v21.
6. The process of claim 1, wherein the process comprises the steps of: the reboiler mentioned in said step E is of the type ISO9001.
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| CN117357919A (en) * | 2023-09-27 | 2024-01-09 | 广东欧赛莱科技有限公司 | NMP (N-methyl pyrrolidone) rectification and purification system and NMP rectification and purification process |
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| CN117357919A (en) * | 2023-09-27 | 2024-01-09 | 广东欧赛莱科技有限公司 | NMP (N-methyl pyrrolidone) rectification and purification system and NMP rectification and purification process |
| CN117357919B (en) * | 2023-09-27 | 2024-05-03 | 广东欧赛莱科技有限公司 | NMP (N-methyl pyrrolidone) rectification and purification system and NMP rectification and purification process |
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