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Method and system for recovering acetic acid from acetic acid aqueous solution

A kind of acetic acid aqueous solution and acetic acid technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of large-scale industrial production difficulties, low membrane flux affecting production, replacement affecting normal production, etc., to achieve comprehensive utilization of heat , good reliability and low equipment investment cost

Inactive Publication Date: 2017-03-29
SINOPEC NANJING ENG & CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membrane separation method has good separation effect and is suitable for low-concentration acetic acid solution, but the membrane price is high, the replacement cost is expensive, and it is easy to break, and replacement affects normal production. Difficulty in large-scale industrial production

Method used

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  • Method and system for recovering acetic acid from acetic acid aqueous solution
  • Method and system for recovering acetic acid from acetic acid aqueous solution

Examples

Experimental program
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Effect test

Embodiment 1

[0030]Acetic acid aqueous solution 50000kg / h with a mass concentration of 30% and extractant (extractant is a mixture of isopropyl acetate, methyl ethyl ketone and hexane, wherein the mass fraction of isopropyl acetate is 85.00%, the mass fraction of methyl ethyl ketone is 6.50%, hexane The mass fraction is 8.50%) 71500kg / h enters the extraction tower C-01 for liquid-liquid extraction operation, and the operating pressure of the extraction tower C-01 is controlled at 0.30MPaG and the temperature is 40°C. Extraction phase 96985kg / h from the top of extraction tower C-01 enters extraction phase storage tank V-01, the upper liquid phase of extraction phase storage tank V-01 92330kg / h enters the primary preheater E-01 of the extraction phase, and the lower liquid 4655kg / h is refluxed to the extraction tower C-01 through the drain pump P-03 of the extractant storage tank. The raffinate phase from the bottom of the extraction tower C-01 enters the raffinate phase storage tank V-03 a...

Embodiment 2

[0032] 60000kg / h of acetic acid aqueous solution with a mass concentration of 50% and extractant (the extractant is a mixture of isopropyl acetate, methyl ethyl ketone and hexane, wherein the mass fraction of isopropyl acetate is 85.00%, the mass fraction of methyl ethyl ketone is 6.50%, and the mass fraction of hexane The mass fraction is 8.50%) 85800kg / h enters the extraction tower C-01 for liquid-liquid extraction operation, and the operating pressure of the extraction tower C-01 is controlled at 0.30MPaG and the temperature is 40°C. The extraction phase 119798 from the top of the extraction tower C-01 enters the extraction phase storage tank V-01, the upper liquid phase of the extraction phase storage tank V-01 114985kg / h enters the primary preheater E-01 of the extraction phase, and the lower liquid 4813kg / h Return to the extraction column C-01 through the pump P-03. The raffinate phase from the bottom of the extraction tower C-01 enters the raffinate phase storage tank V...

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Abstract

The present invention discloses a method and a system for recovering acetic acid from an acetic acid aqueous solution. The technical scheme of the method comprises that an acetic acid aqueous solution and an extractant enter an extraction tower and liquid-liquid extraction operation is performed; the extraction phase is pre-heated and then enters an extraction phase distillation tower, the tower bottom distillate is an acetic acid product, and the tower top distillate is condensed and then enters a layering device; the raffinate phase is pre-heated and then enters the extraction phase distillation tower, the tower top distillate is condensed and then enters the layering device, and the tower bottom distillate is wastewater; and the heavy phase separated by the layering device is the extractant, one part of the extractant returns to the liquid-liquid extraction process, the other part of the extractant refluxes to the extraction phase distillation process, and the light phase separated by the layering device returns to the raffinate phase distillation process. According to the present invention, the treatment process is simple, the investment cost is low, the reliability is good, the separation effect is good, and the purity of the separated acetic acid is high and meets the industrial raw material acetic acid requirement.

Description

technical field [0001] The invention relates to a method and a system for recovering acetic acid from an aqueous solution of acetic acid, belonging to the technical field of fine chemicals. Background technique [0002] Acetic acid is an important organic chemical raw material, widely used in basic organic synthesis, medicine, dyes, spices, pesticides and other industries. For a long time, the recovery of acetic acid from acetic acid aqueous solution has been paid attention to by people, because it is of great significance to the production process, economic performance, resource utilization and environmental protection of various related industries. [0003] At present, domestic and foreign studies on acetic acid recovery methods include rectification, extraction, esterification, neutralization, adsorption, membrane separation, etc., and the combination of the above methods. Ordinary distillation has mature technology and large production capacity. To obtain high-purity ac...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C51/48C07C51/44C07C53/08
CPCC07C51/42C07C51/44C07C51/48C07C53/08
Inventor 刘建文李贤李娜
Owner SINOPEC NANJING ENG & CONSTR
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