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The preparation method of crude isophthalic acid hydrorefining reaction raw material

A crude isophthalic acid, hydrorefining reaction technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry and other directions, can solve the problems of increasing the acetic acid-aqueous solution process and energy consumption and the like

Active Publication Date: 2015-10-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the treatment method of the crude terephthalic acid oxidation slurry proposed in the above-mentioned documents can save the drying unit, it will inevitably produce acetic acid-water solution, which will increase the subsequent processing of acetic acid-water solution and its energy consumption

Method used

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  • The preparation method of crude isophthalic acid hydrorefining reaction raw material
  • The preparation method of crude isophthalic acid hydrorefining reaction raw material
  • The preparation method of crude isophthalic acid hydrorefining reaction raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as image 3 with 4 As shown, take 2000 grams of crude isophthalic acid oxidation slurry-flash slurry I6 that comes out of oxidation reactor 1 and obtains through three-stage decompression flash evaporation, wherein the temperature of the first stage decompression flash evaporation is 201 ° C, The pressure is 11.62kg / cm 2 , the temperature of the second-stage decompression flash is 159°C, and the pressure is 4.59kg / cm 2 , the temperature of the third-stage decompression flash is 92°C, and the pressure is 0.50kg / 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 The feed section 23 of the rotary drum filter press 10 carries out pressure filtration: in weight percentage, isophthalic acid 26.79%, catalyst 0.21%, acetic acid concentration 64.50%, other impurities 8.50%, temperature is 100 ℃, pressure is 4.0 kg / cm 2 , the airspeed is 22hr -1 . Obtain filter cake III ...

Embodiment 2～3

[0032] Only change the number of stages in the oxygen-containing stream sweeping section in embodiment 1, as figure 1 , 2 and 5, 6, the results are shown in Table 1.

Embodiment 4

[0034] Only the purging step of the oxygen-containing stream in Example 1 was removed, and the others were correspondingly kept unchanged. The results are shown in Table 1. It can be seen from the data in Table 1 that if the oxygen-containing purge step is omitted, the filter cake VII12 will still have a large amount of m-xylene in addition to the high residual amount of acetic acid, requiring other complicated post-treatment procedures.

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Abstract

The invention relates to a method for preparing reaction material by hydrofining of crude isophthalic acid and mainly solves the problem that water-acetic acid solution is generated in the prior art. Flash slurry I and flash slurry II are obtained by vacuum flashing of crude isophthalic acid oxidized slurry obtained by an oxidation reactor. Filter cakes III and filtrate IV are obtained by filtering the flash slurry I. the filter cakes III are washed with m-Xylene or acetic acid ester to obtain filter cakes V and filtrate VI. The inside of the filter cakes V are purged by oxygen-containing flow. Residual impurities in the filter cakes V are removed by air entrainment to obtain filter cakes VII and purging tail gas. The problem is solved well by the action of the technical scheme. The method is applicable to preparation of reaction material by hydrofining of crude isophthalic acid.

Description

technical field [0001] The invention relates to a method for preparing crude isophthalic acid hydrogenation refining reaction raw materials. Background technique [0002] Aromatic carboxylic acid is a very important chemical raw material, and there is a huge market demand. In recent years, despite the rapid development of the domestic isophthalic acid (PIA) industry, the production capacity has increased year by year, and the demand has also continued to increase, but the gap between production capacity and demand is still relatively large. The PIA production process includes medium-purity refined PIA production process and mainstream refined PIA production process. The refined PIA production process generally includes two stages of oxidation and refining. The oxidation process uses acetic acid as a solvent and under the action of a cobalt-manganese-bromine catalyst. Pass into oxygen-containing gas (usually adopt air), m-xylene is oxidized in high temperature liquid phase t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C63/24C07C51/42
Inventor 张海涛畅延青
Owner CHINA PETROLEUM & CHEM CORP