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An energy-saving process for separating methanol, isopropanol and water by heat pump extraction and rectification

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: 2021-03-09
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 methanol-isopropanol-water mixture due to azeotropy, and to realize the separation of methanol, isopropanol and water Efficient separation and thermal energy integration to achieve energy saving

Method used

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  • An energy-saving process for separating methanol, isopropanol and water by heat pump extraction and rectification

Examples

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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 process for separating methanol, isopropanol and water through heat pump extraction and rectification. In the method for heat pump extraction and rectification separation of methanol-isopropanol-water mixture, a heat pump compressor is used to pressurize the steam at the top of the dehydration tower as a heat source at the bottom of the dehydration tower, and simultaneously complete the dehydration tower top steam itself Condensation; use the hot stream of extractant recovered from the bottom of the dehydration tower as the heat source for the intermediate reboiler of the demethanol tower. The present invention appropriately increases the temperature and pressure of the steam at the top of the dehydration tower through the heat pump compressor, which is used as a heat source to heat the kettle liquid, thereby realizing reasonable and effective energy circulation; the cost of the heat pump compressor of the present invention is lower than that of traditional external heat supply And the cost of cooling water, resulting in good economic benefits.

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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Patent Type & Authority Patents(China)
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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