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Preparation method of crude terephthalic acid hydrogenation refining reaction raw material

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

Active Publication Date: 2015-08-12
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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  • Preparation method of crude terephthalic acid hydrogenation refining reaction raw material
  • Preparation method of crude terephthalic acid hydrogenation refining reaction raw material
  • Preparation method of crude terephthalic acid hydrogenation refining reaction raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] like image 3 and 4 As shown, take 2000 grams of crude terephthalic acid oxidation slurry-flash slurry I6 that comes out of oxidation reactor 1 and is obtained 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: by weight percentage, terephthalic 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 II...

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 flow purging step is omitted, the filter cake VII12 will still have a large amount of p-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 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 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 terephthalic acid (PTA) 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 PTA production process includes medium-purity refined PTA (QTA or EPTA) production process and the mainstream refined PTA production process. The refined PTA production process generally includes two stages of oxidation and refining. The oxidation process uses acetic acid as a solvent. Under the action of a bromine catalyst, an oxygen-containing gas (usually air) is introduced to oxidize p-xylene in a high-temperature liquid phase ...

Claims

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Application Information

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