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Method for preparing reaction material by hydrofining of crude p-phthalic acid

A technology for crude terephthalic acid and hydrorefining reaction, which is used in the preparation of carboxylate, the preparation of organic compounds, chemical instruments and methods, etc.

Active Publication Date: 2013-12-04
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 the problem of producing acetic acid-water solution in the prior art, and a method for preparing crude terephthalic acid hydrogenation reaction raw material is provided. Process and characteristics of energy saving and consumption reduction

Method used

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  • Method for preparing reaction material by hydrofining of crude p-phthalic acid
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  • Method for preparing reaction material by hydrofining of crude p-phthalic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as image 3 with 4 As shown, take 2000 grams of crude terephthalic acid oxidation slurry-flash slurry I6 obtained from oxidation reactor 1 and three-stage vacuum flash evaporation, where the temperature of the first-stage vacuum flash evaporation is 201°C, The pressure is 11.62kg / cm 2 , The temperature of the second stage vacuum flash evaporation is 159℃, the pressure is 4.59kg / cm 2 , The temperature of the third stage vacuum flash evaporation is 92℃, the pressure is 0.50kg / cm 2 , The flashed slurry I6 enters the pressure difference of 2.5kg / cm through the slurry pump 5 under the following physical conditions 2 The feed section 23 of the rotary drum filter press 10 is filtered by weight: 26.79% terephthalic acid, 0.21% catalyst, 64.50% acetic acid concentration, 8.50% other impurities, temperature 100°C, pressure 4.0 kg / cm 2 , The airspeed is 22hr -1 . After pressure filtration, filter cake III and filtrate IV16 are obtained, the composition of filtrate IV16 is analy...

Embodiment 2～3

[0032] Only change the number of stages of the oxygen-containing flow purge section in Example 1, such as figure 1 , 2 And 5, 6, and the results are shown in Table 1.

Embodiment 4

[0034] Only the oxygen-containing flow purge step in Example 1 is removed, and the others remain unchanged accordingly. The results are shown in Table 1. From the data in Table 1, it can be seen that without the oxygen-containing flow purge step, the filter cake VII12 will still have a large amount of p-xylene in addition to the high residual amount of acetic acid, which requires other complicated post-processing procedures.

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Abstract

The invention relates to a method for preparing a reaction material by hydrofining of crude p-phthalic 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 p-phthalic acid oxidized slurry obtained by an oxidation reactor. Filter cakes III and a filtrate IV are obtained by filtering the flash slurry I. The filter cakes III are washed with p-xylene or acetic acid ester to obtain filter cakes V and a 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 relatively well solved by the action of the technical scheme. The method is applicable to preparation of the reaction material by hydrofining of crude p-phthalic acid.

Description

Technical field [0001] The invention relates to a method for preparing crude terephthalic acid hydrofining 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 terephthalic acid (PTA) industry, the production capacity has increased year by year, and the demand has also continued to increase. The gap between production capacity and demand is still large. The PTA production process includes the medium-purity refined PTA (QTA or EPTA) production process and the mainstream refined PTA production process. The refined PTA production process generally includes two processes of oxidation and refining. The oxidation process uses acetic acid as a solvent, and the cobalt-manganese- Under the action of bromine catalyst, oxygen-containing gas (usually air) is introduced, and the high temperature liquid phase oxidation of p-xyle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C63/26C07C51/43C07C51/42C07C51/265
Inventor 张海涛畅延青
Owner CHINA PETROLEUM & CHEM CORP