Method for separating isopropanol-water compound

A technology of isopropanol and mixture, which is applied in the field of separating isopropanol-water mixture, can solve the problems of corrosive production equipment, high raw material purity requirements, large amount of extractant, etc., and achieve easy operation, easy recovery, and high throughput big effect

Inactive Publication Date: 2013-12-25
TIANJIN CLEANTECH TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The above three methods all have the disadvantages of large amount of extractant, large reflux ratio, and high energy consumption; method 2 and method 3 introduce inorganic salts into the extractant, which is corrosive to production equipment; method 3 requires high purity of raw materials and low Purity raw materials need to be pre-concentrated, which increases production costs

Method used

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  • Method for separating isopropanol-water compound

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Effect test

Embodiment 1

[0030] Attached figure 1As shown in the process flow, there are 50 theoretical plates in the rectification tower, the raw materials (5% isopropanol, 95% water, mass fraction, the same below) are fed from the 46th theoretical plate at a flow rate of 1000kg / hr, and the extraction agent is 1 -Ethyl-3-methylimidazole acetate and glycerin volume ratio of 1.5:1 composition of composite extractant, feed from the 5th theoretical plate, operating pressure is 50kPa, solvent ratio 4.0, reflux ratio 1, recovery The operating pressure of the tower is 95kPa. The output at the top of the rectification tower is 993.7kg / hr, the composition: 99.93% isopropanol, 0.07% water, and the yield of isopropanol is 99.3%. The extraction agent is extracted from the bottom of the recovery tower with a water content of 0.13%, and returned to the rectification tower for recycling.

Embodiment 2

[0032] Attached figure 1 As shown in the process flow, there are 25 theoretical plates in the rectification tower, the raw material (25% isopropanol, 75% water) is fed from the 24th theoretical plate at a flow rate of 1000kg / hr, and the extraction agent is 1-butyl-3- Methylimidazole tetrafluoroborate is fed from the second theoretical plate, the operating pressure is 101.3kPa, the solvent ratio is 1, the reflux ratio is 3.0, and the operating pressure of the recovery tower is 80kPa. The output at the top of the rectification tower is 248.1kg / hr, the composition is: 99.95% isopropanol, 0.05% water, and the yield of isopropanol is 99.2%. The extraction agent is extracted from the bottom of the recovery tower with a water content of 0.11%, and returned to the rectification tower for recycling.

Embodiment 3

[0034] Attached figure 1 As shown in the process flow, there are 35 theoretical plates in the rectification tower, the raw materials (45% isopropanol, 55% water) are fed from the 30th theoretical plate at a flow rate of 1200kg / hr, and the extraction agent is 1-ethyl-3- Methylimidazole acetate is fed from the fifth theoretical plate, the operating pressure is 85kPa, the solvent ratio is 0.8, the reflux ratio is 0.5, and the operating pressure of the recovery tower is 75kPa. The output at the top of the rectification tower is 537.5kg / hr, the composition: 99.96% isopropanol, 0.04% water, and the yield of isopropanol is 99.5%. The extraction agent is extracted from the bottom of the recovery tower with a water content of 0.10%, and returned to the rectification tower for recycling.

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Abstract

The invention provides a method for separating a isopropanol-water compound, which comprises the following steps: adopting an isopropanol-water compound in any proportion as a raw material, taking ionic liquid or a double solvent composed of ionic liquid and an organic solvent as an extraction agent, and extracting isopropanol and water in sequence after the raw material goes through an extractive distillation stage and an extraction agent recycle stage, wherein the extraction agent is used circularly after being extracted in the recycle stage. The method has the advantages that the energy consumption is low, environment pollution can be avoided, the product purity is high, the industrialization is facilitated, the equipment cost is low, and the economic benefit is good.

Description

technical field [0001] The invention belongs to the technical field of isopropanol-water mixture separation, in particular to a method for separating isopropanol-water mixture. Background technique [0002] As an excellent organic solvent, isopropanol is widely used in the production of antibiotics, so a large amount of industrial wastewater containing isopropanol needs to be recycled. Because isopropanol and water azeotrope (azeotropic point 80.3 ℃, of which the mass fraction of isopropanol is 87.4%), it is difficult to obtain high-purity isopropanol by ordinary rectification, so special rectification should be used. At present, extractive distillation is often used in industry to recover isopropanol from isopropanol wastewater. [0003] Gu Zhenggui et al. (CN1560008A) used glycerin as the extractant to separate isopropanol-water system and obtained isopropanol with a purity greater than 99.5%. The optimal operating conditions were: solvent ratio 2.5, reflux ratio 4-5. Ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/10C07C29/84
CPCY02P20/54
Inventor 张学岗张静安喜报迟娜
Owner TIANJIN CLEANTECH TECH
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