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Method for Purifying Crude Terephthalic Acid Oxidation Slurry

A technology of crude terephthalic acid and slurry, which is applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., and can solve the problems of poor washing effect

Active Publication Date: 2015-09-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that there is a problem of poor washing effect in the prior art, and a new method for purifying crude terephthalic acid oxidation slurry is provided, which can better reduce the washing product-filter cake residues of impurities, with the characteristics of simplified procedures, energy saving and consumption reduction

Method used

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  • Method for Purifying Crude Terephthalic Acid Oxidation Slurry
  • Method for Purifying Crude Terephthalic Acid Oxidation Slurry
  • Method for Purifying Crude Terephthalic Acid Oxidation Slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 and 2 As shown, take 100.00 kg of the crude terephthalic acid oxidation slurry obtained from the oxidation reactor 1 and undergo three-stage decompression flash evaporation - flash slurry I6, wherein the temperature of the first-stage decompression flash evaporation is 201 ° C, The flash pressure is 11.62 kg / cm 2 , the temperature of the second-stage decompression flash is 159°C, and the pressure of the flash is 4.59 kg / cm 2 , the temperature of the third-stage decompression flash is 92°C, and the pressure of the flash is 0.50 kg / cm 2 , the flash slurry I6 enters into a pressure difference of 2.5kg / cm through the slurry pump 5 under the following physical property conditions 2 , Filtration area is 0.12m 2 , Rotating speed is that the drum filter press 10 of the drum filter press 10 of 1.5rpm carries out press filtration: air velocity is 22hr -1 , by weight percentage, terephthalic acid 26.79%, catalyst 0.21%, acetic acid concentration 64.50%, other...

Embodiment 2~8

[0035] Such as figure 1 , 2 As shown, only the composition change in the washing solution (composed of water and ethylene glycol monoethyl ether) 20 in Example 1 was changed, and the others were kept unchanged accordingly. The results are shown in Table 1.

Embodiment 9~11

[0037] Such as figure 1 , 2 As shown, the ethylene glycol monoethyl ether in the washing solution (composed of water, ethylene glycol monoethyl ether) 20 in Example 1 was replaced with monomethyl ether, monoisopropyl ether, monoisopropyl ether, Mono-n-butyl ether, others are correspondingly kept unchanged, and the results are shown in Table 2.

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Abstract

The invention relates to a method for purifying crude terephthalic acid oxidation paste, and mainly solves the problem of poor washing effect in the prior art. The method for purifying the crude terephthalic acid oxidation paste comprises the following steps: the crude terephthalic acid oxidation paste obtained through an oxidation reactor is decompressed and flashed to obtain flashed paste I and flashed liquid II; the flashed paste I is filtered to obtain filter cakes III and filtrate IV; the interiors of the filter cakes III are blown by oxygen-contained flows for removing residual impurities in the filter cakes III through the gas flow entrainment mode to obtain filter cakes V and blowing tail gas A; the filter cakes V are washed with washing liquid consisting of 0-95% of water and 5-100% of ROCH2CH2OH by weight, to obtain filter cakes VI and filtrate VII, wherein R is C1-C4 alkyls; the interiors of the filter cakes VI are blown by the oxygen-contained flows for removing the residual impurities in the filter cakes VI through the gas flow entrainment mode to obtain filter cakes VIII and blowing tail gas B. The method preferably solves the problem, and can be applied to the industrial production of purifying the crude terephthalic acid oxidation paste.

Description

technical field [0001] The invention relates to a method for purifying crude terephthalic acid oxidation slurry. Background technique [0002] Aromatic carboxylic acid is a very important chemical raw material, and there is a huge market demand. Although the domestic terephthalic acid (PTA) industry has developed rapidly in recent years, the production capacity has increased year by year, and the demand has also continued to increase. In 2010, the domestic PTA production and apparent consumption were 14.135 million tons and 20.777 million tons, and the self-sufficiency rate was 68.0%. , There is still a large gap between PTA production and apparent consumption. The mainstream PTA production process, that is, the refined PTA production process generally includes two stages of oxidation and refining. The oxidation process uses acetic acid as a solvent, uses a cobalt-manganese-bromine catalyst, introduces oxygen-containing gas (usually air), and p-xylene at high temperature T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C63/26C07C51/42C07C51/44
CPCC07C51/42C07C51/44C07C51/47C07C63/26
Inventor 张海涛司丹畅延青
Owner CHINA PETROLEUM & CHEM CORP