CN105289018A - MVR-vapor permeation coupling device and method used for organic solvent dehydration - Google Patents
MVR-vapor permeation coupling device and method used for organic solvent dehydration Download PDFInfo
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- CN105289018A CN105289018A CN201510778862.1A CN201510778862A CN105289018A CN 105289018 A CN105289018 A CN 105289018A CN 201510778862 A CN201510778862 A CN 201510778862A CN 105289018 A CN105289018 A CN 105289018A
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Abstract
The invention relates to a MVR-vapor permeation coupling method used for organic solvent dehydration, and belongs to the technical field of energy saving and separation. The method used for organic solvent dehydration comprises following steps: a raw material liquid is pressurized by a charging pump, and is successively delivered into a preheater, an evaporator, and a superheater for heating vaporization so as to obtain superheated steam; the superheated steam is delivered into a membrane device for separation; products obtained via separation are pressurized by a compressor so as to obtain high-quality organic solvent product steam; the high temperature high pressure high-quality organic solvent product steam is delivered into the preheater for complete heat exchanging with the raw material liquid, is cooled using the cooler, and then is delivered into a product tank so as to obtain a high purity organic solvent. Compared with the prior art, steam latent heat generated in the method is used fully, energy utilization rate in the system is increased, integrated using of heat energy is realized, average energy saving ranges from 40 to 50%, and it is shown by comprehensive economic benefit evaluation that annual cost of the method can be reduced by 20 to 30%. The MVR-vapor permeation coupling device and the method are suitable for preparing high purity organic solvents from a plurality of organic solvents via dehydration, application range is wide, operation is convenient, production process is clean, and no pollution is caused.
Description
Technical field
The present invention relates to and belong to energy-conservation and separation technology field, be specifically related to a kind of the dehydration of organic solvent coupling device and the process that heat pump techniques (MVR) are applied to Steam soak technology.
Background technology
Organic solvent plays more and more important effect in modern industry is produced, and is mainly used in the fields such as new forms of energy, petrochemical industry, fine chemistry industry, medicine, electronics industry.Dehydration of organic solvent is that organic solvent is produced and a key link in removal process, and many organic solvents can form azeotropic or the mixture that closely boils with water, and adopt conventional separation techniques to produce high-purity organic solvent, energy consumption is large, and operating cost is high.Pervaporation Technology is used for dehydration of organic solvent and has significantly energy-conservation and economic advantages, has started to be widely used.Steam soak technology is a kind of new membrane isolation technics grown up on Pervaporation Technology basis, and compared with infiltration evaporation process, Steam soak process does not exist phase transformation, and avoid temperature difference polarization phenomena, in film, in separation process, energy loss is little; Steam feed, reduce concentration polarization, mass tranfer coefficient significantly improves; Little to the pollution of film, extend the service life of film, this technology can significantly improve film permeation flux and separation, is easy to obtained high-purity organic solvent product.But Steam soak needs higher than feed liquid boiling-point feeding, higher than infiltration evaporation process energy consumption.
Summary of the invention
The object of the invention is for the high problem of Steam soak process energy consumption, the technique of a kind of heat pump techniques and the coupling of Steam soak process is provided, produces high-purity organic solvent for dehydration of organic solvent.The indirect steam compression that the present invention adopts heat pump will to produce in separation process, the organic solvent product steam of obtained high-quality, again this HTHP product steam and material liquid are carried out heat exchange, make full use of the latent heat of material after being separated, to reach significantly energy-conservation effect.
The mentality of designing of technical solution of the present invention: MVR is the indirect steam and energy thereof that utilize technique self to produce, through vapour compression machine compressed action, promotes the pressure of indirect steam, temperature and enthalpy.MVR technology is applied in Steam soak technique, the energy consumption of dehydration of organic solvent process can be reduced, improve the capacity usage ratio of separation process.
The technical solution used in the present invention is: a kind of MVR-Steam soak coupling device for dehydration of organic solvent, comprise the preheater connected successively, evaporimeter, superheater, film device, penetrating fluid condenser, permeate collection tank and vavuum pump, wherein said film device by pipeline successively with compressor, preheater, reactor product cooler, products pot connects, wherein evaporimeter, film device, penetrating fluid condenser and vavuum pump component film piece-rate system, compressor, preheater and superheater composition heat pump, thus film separation system realizes dehydration of organic solvent, and the pressure of the organic solvent product further compressed action improving product steam that film device is separated by heat pump, temperature and enthalpy, more for product steam heat is passed to material liquid, improve heat exchange efficiency, reduce steam consumption quantity and product cooling water amount in film separation system.
According to device of the present invention, preferably described compressor is connected by pipeline with between superheater, and described superheater is connected with reactor product cooler through pipeline, thus the product steam part after compression enters preheater and material liquid heat exchange, a part enters superheater and feedstock vapor heat exchange, product interflow after heat exchange enters reactor product cooler and cools, and reduces energy consumption further.
Present invention also offers a kind of MVR-Steam soak coupling process method for dehydration of organic solvent, the method comprises: directly enter evaporimeter by the raw material after preheater heats, be vaporizated into organic vapor, overheated by superheater again, be superheated to higher than after material liquid boiling point, enter film device to be separated, under vavuum pump effect steam through film by penetrating fluid condenser condenses, product steam enters compressor, product steam after compressor compression enters preheater and material liquid heat exchange, then enters cooler and carry out cooling and obtain object product.
According to method of the present invention, selection process scheme is: the product steam part after compressor compression enters preheater and material liquid heat exchange, a part enters superheater and feedstock vapor heat exchange, and the product interflow after heat exchange enters cooler and cools, and reduces energy consumption further.
Described compressor is preferably centrifugal compressor or roots blower.
Described organic solvent is the organic matters such as alcohols, ethers, ketone or aromatic compound.
The present invention still further provides a kind of rectifying-MVR-Steam soak coupling process method for dehydration of organic solvent, the method comprises: raw material is introduced into rectifying column and sloughs portion of water, enter Steam soak device again to dewater further, product steam after film device is separated is by after compressor compresses, with enter the raw material before rectifying column and carry out heat exchange, then enter cooler and cool and obtain organic solvent product.
The invention has the advantages that: adopt heat pump and Steam soak coupling technique to carry out dehydration of organic solvent, make full use of product steam latent heat in technique, improve system self-energy utilization rate, achieve the integrated utilization of heat.Compared with prior art, this invented technology energy-saving effect is obvious, and on average energy-conservation 40 ~ 50%, Comprehensive Assessment of Financial Performance shows, adopts this technique annual cost to save 20 ~ 30%.The present invention is suitable for multiple dehydration of organic solvent and prepares high-purity organic solvent, applied widely, easy to operate, and production process cleaning is pollution-free.
Accompanying drawing explanation
Fig. 1 is the dehydration of organic solvent installation drawing in the embodiment of the present invention 1,2,
Fig. 2 is the dehydration of organic solvent installation drawing in embodiment 3.
Description of symbols in figure: 1, head tank; 2, feed pump; 3, preheater; 4, evaporimeter; 5, superheater; 6, film device; 7, compressor; 8, cooler; 9, products pot; 10, penetrating fluid condenser; 11, permeate collection tank; 12, vavuum pump.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is described further.
As shown in Figure 1, the operation principle of a kind of MVR-Steam soak coupling device for dehydration of organic solvent of the present invention is as follows:
Material liquid sends into preheater 3, evaporimeter 4 successively from head tank 1 after feed pump 2 pressurizes, superheater 5 is heat vaporized is superheated steam, enter film device 6 to be again separated, the per-meate side of film device maintains negative pressure by vavuum pump, hydrone in solvent enters condenser 10 condensation through film under the effect of transmembrane pressure, then enters permeate collection tank 11; Product steam after UF membrane pressurizes through compressor 7, the organic solvent product steam of obtained high-quality, this HTHP product steam enters preheater 3 and the abundant heat exchange of material liquid, then after cooler 8 further cooling, enters products pot 9, obtained high-purity organic solvent.
Described MVR system refers to from film device 6 product steam out to be compressed through compressor 7, the organic solvent product steam of obtained high-quality, then enters product preheater 3, with material liquid heat exchange.
Described Steam soak technique refers to and directly enters evaporimeter 4 by the raw material after preheater 3 heats, be vaporizated into organic vapor, enter film device 6 after overheated by superheater 5 to be again separated, under vavuum pump effect, steam is through film by penetrating fluid condenser 10 condensation, and product steam enters compressor 7.
Described film device 6 is made up of membrane module and diffusion barrier, membrane module is formed by the mode of series, parallel or series-parallel connection, membrane module can adopt various ways, as tubular type, rolling, the form such as flat, membrane module number is determined by the treating capacity of material liquid and processing requirements, to reach different production capacity.The diffusion barrier adopted refers to the inoranic membrane, organic film, mixed substrate membrane containing nano-grade molecular sieve etc. that water are had to selective penetrated property.
Embodiment one
See Fig. 1, MVR-Steam soak coupling technique is used for ethanol dehydration, and its step is as follows:
Flow is the ethanolic solution of 420kg/h, moisture 10wt.%, from head tank 1, enter preheater 3 after feed pump 2 pressurizes, after carrying out heat exchange with product steam, temperature rises to 106 DEG C, now feedstock portions vaporization, vaporization ratio is 0.56, then enters evaporimeter and is evaporated to alcohol vapour completely.Alcohol vapour enters film device 6 and carries out ethanol dehydration after superheater 5 is superheated to 130 DEG C.This film device is in series by 8 tubular type NaA molecular sieve membrane assemblies, and total fill able membrane area is 60m
2.The alcohol product steam of 99.9wt.% is obtained after film device 6 is separated, it is 185 DEG C that this steam obtains temperature after compressor 7 compresses, pressure is the high-quality alcohol vapour of 5MPa (A), enter preheater 3 and carry out heat exchange with material liquid, product steam all liquefies, temperature is 123 DEG C, then after cooler 8 cools, enters products pot.It is 3KPa (A) that film device 6 controls permeate side pressure by vavuum pump 12, penetrating fluid through condenser 10 condensation laggard enter penetrating fluid collecting tank.Recording penetrating fluid mass flow is 41.8kg/h, and ethanol content is lower than 0.5wt.%.
Compared with the Steam soak technique under same operation condition, the present embodiment energy-conservation 45.9%, saturated vapor consumption reduces 57%, and circulating cooling water consumption reduces 64%.Comprehensive Assessment of Financial Performance shows, adopt MVR-Steam soak coupling technique, annual total cost saves 25%.
Embodiment two
See Fig. 1, MVR-Steam soak coupling technique is used for acetonitrile dehydration, and its step is as follows:
Flow is the acetonitrile solution of 500kg/h, moisture 5wt.%, from head tank 1, enter preheater 3 after feed pump 2 pressurizes, after carrying out heat exchange with product steam, temperature rises to 109 DEG C, now feedstock portions vaporization, vaporization ratio is 0.62, then enters evaporimeter and is evaporated to acetonitrile steam completely.Acetonitrile steam enters film device 6 and carries out acetonitrile dehydration after superheater 5 is superheated to 130 DEG C.This film device is in series by 8 tubular type NaA molecular sieve membrane assemblies, and total fill able membrane area is 68m
2.The acetonitrile product steam of 99.9wt.% is obtained after film device 6 is separated, it is 204 DEG C that this steam obtains temperature after compressor 7 compresses, pressure is the high-quality acetonitrile steam of 5MPa (A), enter preheater 3 and carry out heat exchange with material liquid, product steam all liquefies, temperature is 139 DEG C, then after cooler 8 cools, enters products pot.It is 3KPa (A) that film device 6 controls permeate side pressure by vavuum pump 12, penetrating fluid through condenser 10 condensation laggard enter penetrating fluid collecting tank.Recording penetrating fluid mass flow is 24.6kg/h, and ethane nitrile content is lower than 0.5wt.%.
Compared with the Steam soak technique under same operation condition, the present embodiment energy-conservation 48.7%, saturated vapor consumption reduces 63.7%, and circulating cooling water consumption reduces 59.5%.
Embodiment three
See Fig. 2, MVR-Steam soak coupling technique is used for isopropanol dehydration, and its step is as follows:
Flow is the aqueous isopropanol of 800kg/h, moisture 6wt.%, from head tank 1, enter preheater 3 after feed pump 2 pressurizes, after carrying out heat exchange with product steam, temperature rises to 109 DEG C, now feedstock portions vaporization, vaporization ratio is 0.46, then enters evaporimeter and is evaporated to IPA vapor completely.IPA vapor enters film device 6 and carries out isopropanol dehydration after superheater 5 is superheated to 130 DEG C.This film device is in series by 10 tubular type NaA molecular sieve membrane assemblies, and total fill able membrane area is 80m
2.The isopropyl alcohol product steam of 99.9wt.% is obtained after film device 6 is separated, it is 170 DEG C that this steam obtains temperature after compressor 7 compresses, pressure is the high-quality IPA vapor of 5MPa (A), part flow is that the isopropyl alcohol product steam of 673kg/h sends into preheater and material liquid carries out heat exchange, product vapor (steam) temperature reduces to 110 DEG C, part flow is that the isopropyl alcohol product steam of 80kg/h sends into superheater, product vapor (steam) temperature reduces to 125 DEG C, isopropyl alcohol product interflow after heat exchange enters reactor product cooler, and product temperature enters products pot after reducing to 40 DEG C.It is 3KPa (A) that film device 6 controls permeate side pressure by vavuum pump 12, penetrating fluid through condenser 10 condensation laggard enter penetrating fluid collecting tank.Recording penetrating fluid mass flow is 47.5kg/h, and isopropanol content is lower than 0.5wt%.
Compared with the Steam soak technique under same operation condition, the present embodiment energy-conservation 49.4%, saturated vapor consumption reduces 56.3%, and circulating cooling water consumption reduces 64.6%.
Claims (7)
1. for a MVR-Steam soak coupling device for dehydration of organic solvent, it is characterized in that: comprise the preheater (3) connected successively, evaporimeter (4), superheater (5), film device (6), penetrating fluid condenser (10), permeate collection tank (11) and vavuum pump (12), wherein said film device by pipeline successively with compressor (7), preheater (3), reactor product cooler (8), products pot (9) connects, wherein evaporimeter (4), film device (6), penetrating fluid condenser (10) and vavuum pump (12) component film piece-rate system, compressor (7), preheater (3) and superheater (5) composition heat pump, thus film separation system realizes dehydration of organic solvent, and the pressure of the organic solvent product further compressed action improving product steam that film device (6) is separated by heat pump, temperature and enthalpy, enter preheater and material liquid heat exchange, improves heat exchange efficiency, reduces steam consumption quantity and product cooling water amount in film separation system.
2. device according to claim 1, it is characterized in that: be connected by pipeline between compressor (7) with superheater (5), and described superheater (5) is connected with reactor product cooler (8) through pipeline, thus the product steam part after compression enters preheater (3) and material liquid heat exchange, a part enters superheater and feedstock vapor heat exchange, product interflow after heat exchange enters reactor product cooler (8) and cools, and reduces energy consumption further.
3. the MVR-Steam soak coupling process method for dehydration of organic solvent, it is characterized in that: directly enter evaporimeter (4) by the raw material after preheater (3) heats, be vaporizated into organic vapor, overheated by superheater (5) again, be superheated to higher than after material liquid boiling point, enter film device (6) to be separated, under vavuum pump effect steam through film through penetrating fluid condenser (10) condensation, product steam enters compressor (7), product steam after compressor (7) compression enters preheater (3) and material liquid heat exchange, enter reactor product cooler (8) again to carry out cooling and obtain object product.
4. the MVR-Steam soak coupling process method for dehydration of organic solvent according to claim 3, it is characterized in that: the product steam part after compressor (7) compression enters preheater (3) and material liquid heat exchange, a part enters superheater (5) and feedstock vapor heat exchange, product interflow after heat exchange enters reactor product cooler and cools, and reduces energy consumption further.
5. the MVR-Steam soak coupling process method for dehydration of organic solvent according to claim 3 or 4, is characterized in that: compressor is centrifugal compressor or roots blower.
6. a kind of MVR-Steam soak coupling process method for dehydration of organic solvent according to claim 3 or 4, is characterized in that: described organic solvent is alcohols, ethers, ketone or aromatic compound.
7. rectifying-MVR-Steam soak the coupling process method for dehydration of organic solvent, it is characterized in that: raw material is introduced into rectifying column and sloughs portion of water, enter Steam soak device again to dewater further, product steam after film device is separated is by after compressor compresses, with enter the raw material before rectifying column and carry out heat exchange, then enter cooler and cool and obtain organic solvent product.
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| CN105807028A (en) * | 2016-04-01 | 2016-07-27 | 太原理工大学 | Test device for desorbing gas by heating coal body through high temperature steam |
| CN107029442A (en) * | 2017-06-21 | 2017-08-11 | 江苏北松健康产业有限公司 | A kind of redistillation system and production system for drug extract |
| CN107137958A (en) * | 2017-06-21 | 2017-09-08 | 武汉智宏思博化工科技有限公司 | A kind of Pervaporation membrane dehydration of organic solvent equipment |
| CN107140776A (en) * | 2017-05-26 | 2017-09-08 | 厦门智宏思博环保科技有限公司 | The dehydration device and its technique of esterification products under a kind of acid condition |
| CN110302676A (en) * | 2019-07-29 | 2019-10-08 | 南京工业大学 | Pervaporation device and method for recycling energy |
| CN110452125A (en) * | 2019-09-03 | 2019-11-15 | 天津科技大学 | A kind of toluenediamine dewatering and device based on mechanical steam recompression MVR |
| CN110538480A (en) * | 2019-09-25 | 2019-12-06 | 上海电气集团股份有限公司 | condensing system and condensing method |
| CN114956935A (en) * | 2022-06-09 | 2022-08-30 | 南京佳华工程技术有限公司 | Coupling deep dehydration method and system for electronic-grade water-containing organic matters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105807028A (en) * | 2016-04-01 | 2016-07-27 | 太原理工大学 | Test device for desorbing gas by heating coal body through high temperature steam |
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