Energy-saving technology for performing extractive distillation separation on methanol, isopropanol and water through heat pump

A technology of extractive distillation and isopropanol, which is applied in the direction of extractive distillation, liquid solution solvent extraction, water, etc., and can solve the problem of difficult separation of methanol-isopropanol-water mixture

Active Publication Date: 2018-01-26
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a method for heat pump extraction and rectification of methanol-isopropanol-water mixture, to solve the problem of difficult separation of

Method used

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  • Energy-saving technology for performing extractive distillation separation on methanol, isopropanol and water through heat pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 2000kg / h of 20wt% methanol and 30wt% isopropanol as an example:

[0033] The number of plates in the methanol removal tower (T1) is 60, and the mixed material enters the methanol removal tower (T1) from the 25th tray, and the stream 6 passes through the bottom stream of the intermediate reboiler (R2) and the dehydration tower (T3) After heat exchange, it is refluxed from the 50th tray to the methanol removal tower (T1). The column bottom stream 5 of the demethanolization tower (T1) enters the deisopropanol tower (T2) by the 30th block tower, and the deisopropanol tower (T2) has 42 trays in total, and the extractant ethylene glycol is fed by the 2nd plate Enter the removal of isopropanol tower (T2), the flow rate of extractant ethylene glycol is 2000kg / h. The operating pressure of the dehydration tower is normal pressure, and the dehydration tower (T3) has 22 plates in total. The mixed solution of water and extractant enters the dehydration tower (T3) from the 12t...

Embodiment 2

[0035] Take the 1800kg / h mixed solution of 17wt% methanol and 33wt% isopropanol as an example:

[0036]The number of plates in the methanol removal tower (T1) is 58, the mixed material enters the methanol removal tower (T1) from the 24th tray, and the stream 6 passes through the bottom stream of the intermediate reboiler (R2) and the dehydration tower (T3) After heat exchange, it is refluxed from the 51st tray to the methanol removal tower (T1). The column bottom stream 5 of the methanol removal tower (T1) enters the removal of isopropanol tower (T2) from the 31st block tower, and the removal of isopropanol tower (T2) has 41 trays in total, and the extractant ethylene glycol is fed by the 4th block Enter the isopropanol removal tower (T2), and the flow rate of the extractant ethylene glycol is 1850kg / h. The operating pressure of the dehydration tower is normal pressure, and the dehydration tower (T3) has a total of 23 plates. The mixed solution of water and extractant enters...

Embodiment 3

[0038] Take the 2100kg / h mixed solution of 22wt% methanol and 32wt% isopropanol as an example:

[0039] The number of plates in the methanol removal tower (T1) is 61, and the mixed material enters the methanol removal tower (T1) from the 26th tray, and the stream 6 passes through the bottom stream of the intermediate reboiler (R2) and the dehydration tower (T3) After heat exchange, it is refluxed from the 49th tray to the demethanolization tower (T1). The column bottom stream 5 of the methanol removal tower (T1) enters the removal of isopropanol tower (T2) from the 28th block tower, and the removal of isopropanol tower (T2) has a total of 42 trays, and the extractant ethylene glycol is fed from the 3rd block Enter the removal of isopropanol tower (T2), the flow rate of the extractant ethylene glycol is 2050kg / h. The operating pressure of the dehydration tower is normal pressure, and the dehydration tower (T3) has a total of 20 plates. The mixed solution of water and extracta...

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Abstract

The invention provides an energy-saving technology for performing extractive distillation separation on methanol, isopropanol and water through a heat pump. In the method for performing extractive distillation separation on a methanol, isopropanol and water mixture through the heat pump, vapor at the top of a dehydration tower is boosted by utilizing a heat pump compressor to be used as a heat source at the bottom of an isopropanol removal tower, and the self condensation of the vapor at the top of the dehydration tower can be completed; and an extractant heat matter stream recycled at the bottom of the dehydration tower is adopted as a heat source of a middle reboiler of a methanol removal tower. The temperature and pressure of vapor at the top of the dehydration tower are properly increased through the heat pump compressor to be used as a heat source for heating reactor liquid, thus realizing reasonable and effective energy circulation; and the cost spent by the heat pump compressoris lower than that of the traditional external heat supply and cooling water, so that good economic benefits can be gained.

Description

【Technical field】 [0001] The invention belongs to the field of separation and purification in the chemical industry, and specifically relates to a process for separating methanol-isopropanol-water by heat pump extraction and rectification. In the above method, heat pump technology is adopted to realize the recycling of heat energy. 【Background technique】 [0002] Both methanol and isopropanol are important organic chemical raw materials and solvents. Methanol is mainly used to make medicine, pesticide, formaldehyde, plexiglass, etc. It is also a solvent for paint dyes, nitrocellulose, etc. Isopropanol can be used to produce acetone, hydrogen peroxide, methyl isobutyl ketone, etc., as well as raw materials for medicines and pesticides, as well as solvents in the production of coatings, inks, extractants, aerosols, etc. In the production of pharmaceutical factories, a large amount of methanol-isopropanol-water mixture will be produced, and the separation of methanol-isopropan...

Claims

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Application Information

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IPC IPC(8): C07C29/84C07C31/04C07C31/10C01B5/00B01D3/40B01D3/14B01D11/04
CPCY02P20/10Y02P20/129
Inventor 王英龙文桂林于萌潇朱兆友
Owner QINGDAO UNIV OF SCI & TECH
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