CN213446913U - System for recovering absolute ethyl alcohol by combining rectification, vaporization membrane and MVR (mechanical vapor recompression) technology - Google Patents
System for recovering absolute ethyl alcohol by combining rectification, vaporization membrane and MVR (mechanical vapor recompression) technology Download PDFInfo
- Publication number
- CN213446913U CN213446913U CN202022498899.8U CN202022498899U CN213446913U CN 213446913 U CN213446913 U CN 213446913U CN 202022498899 U CN202022498899 U CN 202022498899U CN 213446913 U CN213446913 U CN 213446913U
- Authority
- CN
- China
- Prior art keywords
- rectification
- membrane
- ethanol
- tower
- mvr
- Prior art date
- 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.)
- Active
Links
Images
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model relates to a system for recovering absolute ethyl alcohol by combining rectification, vaporization membrane and MVR technology. The system for recovering the absolute ethyl alcohol by combining the rectification, the vaporization membrane and the MVR technology is characterized by comprising a rectification tower and a pervaporation membrane device, wherein the pervaporation membrane device consists of 5-20 stages of membrane components connected in series, a gas phase part at the top of the rectification tower is connected with a first stage of membrane component of the pervaporation membrane device through a pipeline, a gas phase part generated by a last stage of membrane component of the pervaporation membrane device is conveyed to a compressor A through a pipeline, is compressed by the compressor A and heated up and then is conveyed to the rectification tower as a heat source, and is recovered after heat exchange in the rectification tower. The utility model provides a new energy-conserving technology thinking, this technology combines together MVR technique, pervaporation membrane dehydration technique and rectification technique, utilizes respective energy-conserving advantage, further reduces fresh steam consumption by a wide margin to really realize the low energy consumption operation in the absolute ethyl alcohol preparation process.
Description
Technical Field
The utility model relates to a system for anhydrous alcohol is retrieved to combined rectification, vaporization membrane and MVR technique belongs to the rectification and draws technical field.
Background
Two methods for preparing absolute ethanol are commonly used at present:
one is extractive distillation, and three-tower treatment is adopted. The first tower is a dehydration tower, the low-concentration ethanol-containing water solution firstly passes through the first tower, the ethanol-containing water solution with the concentration higher than 90% is prepared at the top of the tower, and the wastewater is extracted at the bottom of the tower; the second tower is an extraction and rectification tower, ethylene glycol is used as an extracting agent, the azeotropic phenomenon of ethanol and water is broken through the action of the extracting agent, anhydrous ethanol is extracted from the top of the second tower, and a mixture of the ethylene glycol and the water is extracted from the bottom of the second tower; the third tower is an extracting agent recovery tower, water is evaporated from the tower top, and anhydrous glycol is extracted from the tower bottom and used as an extracting agent;
and the other method is a method combining rectification and a pervaporation membrane, low-concentration ethanol water is dehydrated through a rectification tower to prepare an ethanol water solution crude product with the water content of less than 10-15%, part of the ethanol crude product is sent to the pervaporation membrane to be dehydrated for the second time, an ethanol water mixture enters the pervaporation membrane in a gaseous form, water can permeate the membrane component due to the small molecular weight, ethanol cannot permeate the membrane component, the gaseous ethanol water mixture sequentially passes through a plurality of membrane components connected in series, the water content of the gaseous ethanol water mixture is gradually reduced to meet the requirement, and the qualified anhydrous ethanol can be prepared after condensation.
In the method, the ethanol in the raw material is subjected to at least two vaporization processes, the heat required by vaporization is provided by fresh steam, and particularly when the recovery amount of the ethanol is large, the energy consumption required by operation is high.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the problem that power consumption is high when operating to current processing technology provides a system that anhydrous alcohol was retrieved to joint rectification, vaporization membrane and MVR technique.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
the system for recovering the absolute ethyl alcohol by combining the rectification, the vaporization membrane and the MVR technology is characterized by comprising a rectification tower and a pervaporation membrane device, wherein the pervaporation membrane device consists of 5-20 stages of membrane components connected in series, a gas phase part at the top of the rectification tower is connected with a first stage of membrane component of the pervaporation membrane device through a pipeline, a gas phase part generated by a last stage of membrane component of the pervaporation membrane device is conveyed to a compressor A through a pipeline, is compressed by the compressor A and heated up and then is conveyed to the rectification tower as a heat source, and is recovered after heat exchange in the rectification tower.
On the basis of the technical scheme, the utility model discloses a reach the convenience of use and the stability of equipment, can also make following improvement to foretell technical scheme:
furthermore, a reboiler is arranged between the compressor A and the rectifying tower.
Further, pumping the ethanol-containing solution to be treated to a rectifying tower, wherein the operating pressure of the rectifying tower is 0.11-0.22 MPaG of pressurization, and the number of theoretical plates of the rectifying tower is 25-55; heating the solution containing ethanol to be treated in a rectifying tower to vaporize, wherein the top of the rectifying tower is a gas-phase crude ethanol product; conveying the crude ethanol product in the gas phase to pervaporation membrane equipment, wherein the pervaporation membrane equipment is formed by a plurality of membrane components connected in series; the ethanol crude product passes through a last stage membrane module of the pervaporation membrane equipment to obtain the vaporous ethanol with water meeting the requirements, the vaporous ethanol is conveyed to a compressor A for compression and temperature rise, the vaporous ethanol after temperature rise is used as a heat source to be conveyed to a rectifying tower, and the vaporous ethanol is recovered after heat exchange is completed in the rectifying tower.
The technical scheme has the advantages that the MVR technology is integrated into a system for rectifying and vaporizing the membrane to recover the absolute ethyl alcohol, the temperature of the vaporous ethyl alcohol is raised through compression and temperature rise of the compressor A, the vaporous ethyl alcohol is used for heating the rectifying tower, the utilization of fresh steam is reduced, and the energy consumption of the system is reduced.
Further, the ethanol content in the ethanol-containing solution to be treated is 30-85%.
Furthermore, the feeding position of the rectifying tower is 15-45 theoretical plates.
Further, the raw material feeding temperature is 15-65 ℃, the top temperature is 95-110 ℃, and the bottom temperature is 110-125 ℃.
Further, the operational reflux ratio of the rectifying tower is 0.5-2.5.
Furthermore, the membrane modules in the pervaporation membrane equipment 2 are connected in series by 5-20 stages.
Furthermore, the operating pressure of the pervaporation membrane equipment is 0.1-0.15 MPaG, and the pressure of the permeation side is-0.095-0.1 MPaG.
Further, the pressure of the inlet of the compressor A is normal pressure to 0.05MPaG, and the pressure of the outlet side is 0.35 to 0.5 MPaG; the inlet temperature of the compressor A is 78-85 ℃, and the outlet temperature of the compressor A is 120-132 DEG C
The utility model has the advantages that: the utility model provides a new energy-conserving technology thinking, this technology combines together MVR technique, pervaporation membrane dehydration technique and rectification technique, utilizes respective energy-conserving advantage, further reduces fresh steam consumption by a wide margin to really realize the low energy consumption operation in the absolute ethyl alcohol preparation process.
Drawings
FIG. 1 is a schematic flow diagram of a system for recovering anhydrous ethanol incorporating rectification, vaporization membrane and MVR techniques according to the present application;
FIG. 2 is a schematic side view of a rectification column in a system for recovering absolute ethanol by combining rectification, vaporization membrane and MVR technologies according to the present application;
FIG. 3 is a schematic side view of a pervaporation membrane device in a system for recovering anhydrous ethanol by combining rectification, vaporization membrane and MVR technologies according to the present application.
The reference numbers are recorded as follows: 1-rectifying tower, 2-pervaporation membrane equipment, 2.1-membrane component, 3-compressor A, 4-reboiler A, 5-compression moulding machine B, 6-reboiler B, 7-reflux tank and 8-condenser.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
A system for recovering absolute ethyl alcohol by combining rectification, a vaporization membrane and an MVR (mechanical vapor recompression) technology (see figures 1-3) comprises a rectification tower 1 and a pervaporation membrane device 2, wherein the pervaporation membrane device 2 consists of 5-20 stages of membrane modules 2.1 which are connected in series, a gas phase part at the top of the rectification tower 1 is connected with a first stage of membrane module 2.1 of the pervaporation membrane device 2 through a pipeline, a gas phase part generated by the last stage of membrane module 2.1 of the pervaporation membrane device 2 is conveyed to a compressor A3 through a pipeline, and is conveyed to the rectification tower 1 as a heat source after being compressed and heated by the compressor, a reboiler 4 is arranged between the compressor A3 and the rectification tower 1, and the anhydrous ethyl alcohol is recovered after heat exchange in the rectification tower. The membrane module 2.1 adopts a vaporization permeable membrane.
In the above system: pumping the ethanol-containing solution to be treated to a rectifying tower 1, wherein the operating pressure of the rectifying tower 1 is 0.11-0.22 MPaG of pressurization, and the number of theoretical plates of the rectifying tower 1 is 25-55; the solution containing ethanol to be treated is heated and vaporized in the rectifying tower 1, and the top of the rectifying tower 1 is a gas-phase ethanol crude product; conveying the crude ethanol product in the gas phase to pervaporation membrane equipment 2, wherein the pervaporation membrane equipment 2 is formed by a plurality of membrane components connected in series; the ethanol crude product passes through the last stage membrane module of the pervaporation membrane device 2 to obtain the vaporous ethanol with water meeting the requirement, the vaporous ethanol is conveyed into a compressor A3 for compression and temperature rise, the vaporous ethanol after temperature rise is taken as a heat source and conveyed into the rectifying tower 1, and the vaporous ethanol is recovered after heat exchange is completed in the rectifying tower 1.
Wherein, the ethanol content in the ethanol-containing solution to be treated is 30-85%;
the feeding position of the feeding of the rectifying tower 1 is 15-45 theoretical plates;
the raw material feeding temperature is 15-65 ℃, the top temperature is 95-110 ℃, and the bottom temperature is 110-125 ℃; the operational reflux ratio of the rectifying tower is 0.5-2.5;
the number of series stages of membrane components in the pervaporation membrane equipment 2 is 5-20; the operating pressure of the pervaporation membrane equipment is 0.1-0.15 MPaG, and the pressure of the permeation side is-0.095-0.1 MPaG;
the pressure at the inlet of the compressor A is between the normal pressure and 0.05MPaG, and the pressure at the outlet side is between 0.35 and 0.5 MPaG; the inlet temperature of the compressor A is 78-85 ℃, and the outlet temperature of the compressor A is 120-132 ℃.
A reboiler B6 is also arranged at the rectifying tower 1, and the reboiler B6 is used for initially providing a heat source for the rectifying tower 1;
for absolute ethyl alcohol reaching the recovery standard, a reflux tank 7 connected with the rectifying tower 1 is arranged, pumps at the positions of pump inlets are arranged in front of and behind the reflux tank, and a magnetic pump can be adopted; a compressor B5 can be arranged between the reboiler A4 and the reflux tank 7 and is used for compressing and storing the high-temperature absolute ethyl alcohol led out from the reboiler 4 into the reflux tank;
the wastewater recovered in the membrane component 2.1 of the pervaporation membrane device 2 passes through a condenser 8 and then is introduced into a wastewater receiving tank.
The following table shows that the method can effectively improve the production of absolute ethyl alcohol by specific processing data, and the MVR technology is adopted to improve the heat energy utilization in the system, which is beneficial to reducing the energy consumption of the system:
the above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. The system for recovering the absolute ethyl alcohol by combining rectification, vaporization membrane and MVR technologies is characterized by comprising a rectification tower (1) and a pervaporation membrane device (2), wherein the pervaporation membrane device (2) consists of 5-20 stages of membrane modules (2.1) which are connected in series, a gas phase part at the top of the rectification tower (1) is connected with a first-stage membrane module (2.1) of the pervaporation membrane device (2) through a pipeline, a gas phase part generated by a last-stage membrane module (2.1) of the pervaporation membrane device (2) is conveyed to a compressor A (3) through a pipeline, and is conveyed to the rectification tower (1) as a heat source after being compressed and heated by the compressor A (3), and is recovered after heat exchange in the rectification tower (1).
2. The system for recovering anhydrous ethanol by combining rectification, vaporization membrane and MVR technology according to claim 1, characterized in that a reboiler is arranged between the compressor A (3) and the rectification column (1).
3. The system for recovering anhydrous ethanol by combining rectification, vaporization membrane and MVR technology according to claim 1, characterized in that the ethanol-containing solution to be treated is pumped to the rectification tower (1), the operation pressure of the rectification tower (1) is 0.11-0.22 MPaG of pressurization, and the number of theoretical plates of the rectification tower (1) is 25-55; the solution containing ethanol to be treated is heated and vaporized in the rectifying tower (1), and the top of the rectifying tower (1) is a gas-phase ethanol crude product; conveying the crude ethanol product in the gas phase to pervaporation membrane equipment (2), wherein the pervaporation membrane equipment (2) is provided with a plurality of membrane modules (2.1) connected in series; the ethanol crude product passes through the last stage membrane module of the pervaporation membrane device (2) to obtain the vaporous ethanol with water meeting the requirement, the vaporous ethanol is conveyed into a compressor A (3) for compression and temperature rise, the vaporous ethanol after temperature rise is taken as a heat source to be conveyed into a rectifying tower (1), and the vaporous ethanol is recovered after heat exchange is completed in the rectifying tower (1).
4. The system for recovering absolute ethanol by combining rectification, vaporization membrane and MVR technology according to claim 3, wherein the feeding position of the feeding material of the rectification column (1) is 15-45 theoretical plates.
5. The system for recovering anhydrous ethanol by combining rectification, vaporization membrane and MVR technology according to claim 4, wherein the membrane modules in the pervaporation membrane device (2) are connected in series in 5-20 stages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022498899.8U CN213446913U (en) | 2020-11-03 | 2020-11-03 | System for recovering absolute ethyl alcohol by combining rectification, vaporization membrane and MVR (mechanical vapor recompression) technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022498899.8U CN213446913U (en) | 2020-11-03 | 2020-11-03 | System for recovering absolute ethyl alcohol by combining rectification, vaporization membrane and MVR (mechanical vapor recompression) technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213446913U true CN213446913U (en) | 2021-06-15 |
Family
ID=76298276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022498899.8U Active CN213446913U (en) | 2020-11-03 | 2020-11-03 | System for recovering absolute ethyl alcohol by combining rectification, vaporization membrane and MVR (mechanical vapor recompression) technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213446913U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115305143A (en) * | 2022-09-14 | 2022-11-08 | 重庆中吉达环保科技有限公司 | Method for refining waste mineral oil |
-
2020
- 2020-11-03 CN CN202022498899.8U patent/CN213446913U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114956935B (en) * | 2022-06-09 | 2024-03-26 | 南京佳华科技股份有限公司 | Electronic-grade water-containing organic matter coupling deep dehydration method and system |
| CN115305143A (en) * | 2022-09-14 | 2022-11-08 | 重庆中吉达环保科技有限公司 | Method for refining waste mineral oil |
| CN115305143B (en) * | 2022-09-14 | 2023-04-07 | 重庆中吉达环保科技有限公司 | Method for refining waste mineral oil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213446913U (en) | System for recovering absolute ethyl alcohol by combining rectification, vaporization membrane and MVR (mechanical vapor recompression) technology | |
| CN104788289B (en) | A kind of pump coupled heat technique of ethylene glycol rectifying | |
| CN106068149A (en) | A kind of economic benefits and social benefits cross-flow MVR evaporation concentration system | |
| CN103123203B (en) | Method of preparing pure nitrogen by using exhaust gas with nitrogen to carry out once-more cryogenic distillation | |
| CN105783424B (en) | The air separating method of high-pressure oxygen-enriched gas is produced using cold energy of liquefied natural gas | |
| CN100551895C (en) | A kind of method that from contain acetic acid containing waste water, reclaims acetic acid | |
| EP3719427A1 (en) | Cryogenic distillation method and apparatus for producing pressurized air by means of expander booster in linkage with nitrogen expander for braking | |
| WO2021213552A1 (en) | Multi-column differential pressure energy-saving anhydrous alcohol distillation system and anhydrous alcohol energy-saving production method | |
| CN111635293A (en) | Sodium methoxide production device and method | |
| CN203483884U (en) | Device for concentrating caprolactam solution with combination of mechanical vapor recompression and multiple-effect evaporation | |
| CN106542965B (en) | The method of low carbon mixed alcohol tower reactor flash separation methanol | |
| CN108409532A (en) | A kind of alkyl esterification method production glyphosate solvent recovering system and technique based on B-grade condensation | |
| CN108380029A (en) | A kind of alkyl esterification method glyphosate solvent recovering system and technique | |
| CN110028385B (en) | Method and device for separating isopropyl alcohol diisopropyl ether aqueous solution | |
| CN212700613U (en) | Organic solvent dehydration device with heat pump rectification and pervaporation coupling | |
| CN109876485A (en) | Acetic acid recovery is from backheat rectifier unit and method | |
| CN210656809U (en) | Tar negative pressure dewatering system | |
| CN112194567A (en) | Process and system for recovering absolute ethyl alcohol by combining rectification, vaporization membrane and MVR (mechanical vapor recompression) technology | |
| CN218553168U (en) | Device for separating methanol and dimethyl carbonate azeotrope by membrane separation coupled rectification | |
| CN104341268B (en) | A kind of alcohol fuel continuous dehydration method | |
| CN108358763A (en) | A kind of alkyl esterification method glyphosate solvent recovering system and technique based on three-level condensation | |
| CN105693468B (en) | Isopropyl acetate hydrogenization method production ethanol and the post-processing approach of isopropanol | |
| CN110963890B (en) | Refining method of gaseous methanol | |
| CN205262061U (en) | High pure nitrogen air separation device | |
| CN208747971U (en) | A kind of alkyl esterification method production glyphosate solvent recovering system based on B-grade condensation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |