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Method used for extracting high purity methyl acetate from effluent of terephthalic acid industrial production

A methyl acetate, high-purity technology, applied in the field of extracting high-purity methyl acetate, can solve problems such as complex processes, and achieve the effect of simple process, simple steps, and no waste water discharge

Inactive Publication Date: 2017-05-31
NANJING POLYTECHNIC INSITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waste liquid containing methyl acetate produced in the industrial production of terephthalic acid is combined with side stream rectification and salt extraction to obtain high-purity methyl acetate conveniently and cheaply, which overcomes the need to use It is difficult to directly produce high-purity methyl acetate from waste liquid by a single rectification or extraction method, which avoids the disadvantages of complicated processes in current purification methods

Method used

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  • Method used for extracting high purity methyl acetate from effluent of terephthalic acid industrial production
  • Method used for extracting high purity methyl acetate from effluent of terephthalic acid industrial production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, about 90% of the methyl acetate raw material is sent to the B1 side stream discharge rectification tower, the temperature of the control tower still is 63 ° C, the reflux ratio is 15, and the steam at the boiling point of 56 ~ 58 ° C is extracted from the side line, and the steam Directly sent to the B3 extractive distillation tower for extraction and rectification; the top of the tower is the light impurities in the raw materials, and the heavy components in the tower still enter the B2 recovery tower to recover the steam rich in methyl acetate, and the tower still gets the heavy impurities in the raw materials, and the tower top It is the steam rich in methyl acetate, which is sent to the raw material for recycling. The methyl acetate steam F of side line extraction and the saline extraction agent S that prepares are with the ratio of volume 1:1 (wherein, extraction agent S is dimethyl phthalate, and sodium bicarbonate accounts for 8wt of extraction agent...

Embodiment 2

[0036] The operation is basically the same as that of Example 1, except that the temperature of the bottom of the rectifying tower with single-side discharge is 70°C, and the reflux ratio is 15; the volume ratio of dimethyl sulfoxide and dimethyl phthalate in the extractant S is 2:1, the feed volume ratio of the methyl acetate steam F and the extractant S extracted from the side line is 1:2, and the purity of the high-purity methyl acetate P obtained at the top sampling port of the extractive distillation column B3 is 99.65% , the recovery rate of methyl acetate was 98.5%.

Embodiment 3

[0038] The operation is basically the same as in Example 1, except that the temperature of the rectification tower bottom of the single-side discharge rectification tower is 60 ° C, and the reflux ratio is 12; the volume ratio of dimethyl sulfoxide and dimethyl phthalate in the extractant S is 1 : 1, magnesium chloride accounts for 7wt% of extractant gross mass. The purity of the high-purity methyl acetate P obtained from the top sampling port of the extractive distillation column B3 is 99.60%, and the recovery rate of methyl acetate is 97.5%.

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Abstract

The invention mainly provides a method used for extracting high purity methyl acetate from effluent of terephthalic acid industrial production. According to the method, methyl acetate-containing effluent generated in terephthalic acid industrial production is subjected to side line discharge rectification and salt-adding extraction rectification, so that high purity methyl acetate is prepared conveniently at low cost, a problem that direct preparation of high purity methyl acetate from effluent via single rectification or extraction is difficult to realize is solved, and a defect that conventional purification technology is complex is avoided. After treatment of the effluent, methyl acetate with a purity of 99.6% or higher can be obtained; technology process is simple; energy consumption is low; and the method is convenient for industrialization.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method for extracting high-purity methyl acetate from terephthalic acid industrial production waste liquid. Background technique [0002] As a new type of basic chemical raw material, methyl acetate has a series of advantages such as low boiling point, strong solvency, and pollution-free. It has a wide range of uses and is an environmentally friendly product. The market usage is increasing year by year. [0003] At present, crude methyl acetate (75%, 92%), as a low-end solvent product, has been widely recognized by users. However, high-purity methyl acetate, due to its stable performance and fast volatilization speed, will not cause "burning" or "whitening" when used in any proportion when preparing diluents. Its application fields and usage are gradually expanding. The price and usage are far more than crude methyl acetate. [0004] In the production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/54C07C31/04C07C29/80
CPCC07C67/54C07C29/80C07C69/14C07C31/04
Inventor 顾美娟潘勇
Owner NANJING POLYTECHNIC INSITUTE