Dissolution processing method for CTA draff in PTA production

A treatment method and technology for residues, applied in the field of dissolution treatment of CTA residues in the production of PTA, can solve the problems of complex process, high recovery cost, difficult to popularize and use, etc., achieve great economic benefits, solve processing problems, and high promotion and use value. Effect

Active Publication Date: 2009-04-08
XIAMEN HAIWAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned first method of recycling CTA residue is only to recycle one component in the residue, and other components are discarded as residue again, and its treatment is also a great environmental problem; the second meth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First take three small samples from the CTA residue of 6000KG, and measure the benzoic acid content in the CTA residue to be about 25%. According to the benzoic acid content recorded, the CTA residue and water are made into a slurry in a weight ratio of 1:4, and put in Heat to 95°C in a dissolving kettle, keep the temperature for 18 minutes, and filter while hot to obtain mixed acid filter cake and hot filtrate of crude benzoic acid. The obtained mixed acid filter cake is collected and bagged. The main components of the mixed acid filter cake are terephthalic acid, isophthalic acid and trimellitic acid, which can be directly used as raw materials for the production of unsaturated resins and plasticizers.

[0020] Then inject the hot filtrate of crude benzoic acid obtained in the previous step into a cooling pool and cool naturally to 35° C. to crystallize for 24 hours, and obtain crude benzoic acid filter residue and aqueous solution after filtration. The aqueous soluti...

Embodiment 2

[0024] First take three small samples from the CTA residue of 10000KG, and the benzoic acid content in the CTA residue is measured to be about 20%. According to the benzoic acid content recorded, the CTA residue and water are made into a slurry in a weight ratio of 1: 3.8, and put in Heat to 100°C in a dissolving kettle, keep the temperature for 20 minutes, and filter while hot to obtain mixed acid filter cake and hot filtrate of crude benzoic acid. The obtained mixed acid filter cake is collected and bagged. The main components of the mixed acid filter cake are terephthalic acid, isophthalic acid and trimellitic acid, which can be directly used as raw materials for the production of unsaturated resins and plasticizers.

[0025] Then pour the hot filtrate of crude benzoic acid obtained in the previous step into the cooling pool and cool naturally to 30° C. to crystallize for 24 hours, and obtain the crude benzoic acid filter residue and aqueous solution after filtration. The a...

Embodiment 3

[0029] First get three parts of small sample from the CTA residue of 5000KG, measure the benzoic acid content in the CTA residue to be about 30%, according to the benzoic acid content that records, CTA residue and water are made into slurry by weight ratio 1: 5, put in Heat to 100°C in a dissolving kettle, keep the temperature for 20 minutes, and filter while hot to obtain mixed acid filter cake and hot filtrate of crude benzoic acid. The obtained mixed acid filter cake is collected and bagged. The main components of the mixed acid filter cake are terephthalic acid, isophthalic acid and trimellitic acid, which can be directly used as raw materials for the production of unsaturated resins and plasticizers.

[0030]Then inject the hot filtrate of crude benzoic acid obtained in the previous step into a cooling pool and cool naturally to 36° C. to crystallize for 24 hours, and obtain crude benzoic acid filter residue and aqueous solution after filtration. The aqueous solution is s...

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Abstract

The invention relates to a solvent processing method for CTA residue during the PTA production. The method comprises the following steps: mixing the CTA residue and water into slurry which is dissolved and filtrated to obtain mixed acid filter cake and hot crude benzoic acid filtrate; injecting the obtained hot crude benzoic acid filtrate into a cooling pond for natural cooling and crystallization, and obtaining crude benzoic acid filter residue and aqueous solution after filtration; injecting the obtained crude benzoic acid filter residue into a sintering kettle for heating and melting, and obtaining a big block of crude benzoic acid after cooling and recrystallization in a reception tray; and adding the obtained big block of the crude benzoic acid into a distillation tower for benzoic acid distillation, and obtaining the industrial-grade benzoic acid from the top of the tower through the heat exchange and separation of filler gas liquid in the distillation tower. The method which carries out the synthesized processing of the CTA residue in the PTA production through the solvent processing method can sufficiently extract various valuable constituents in the CTA residue, thereby not only solving the problem of processing the CTA residue during the PTA production, but also creating great economic benefits. Therefore, the method has high promotion and application values.

Description

technical field [0001] The invention relates to a method for recycling residues in petrochemical production, in particular to a method for dissolving CTA residues in PTA production. Background technique [0002] In the PTA (purified terephthalic acid) plant, when PX (p-xylene) is oxidized to generate CTA (crude terephthalic acid), a large number of side reactions occur, and the generated by-products and unreacted raw materials enter the mother liquor , The solid impurity produced after the mother liquor is evaporated to recover acetic acid is called CTA residue. [0003] The composition of CTA residue is complex, and its composition often changes. It mainly contains the following components: benzoic acid, terephthalic acid, isophthalic acid, phthalic acid, other organic substances, and Co, Mn organic salt catalysts, etc. The components are complex and the composition is not fixed, and the cost of recycling and processing is high, so people usually use the following methods ...

Claims

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Application Information

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IPC IPC(8): C07C63/06C07C51/42C07C63/14C08G63/00
Inventor 陈少岳黄有明
Owner XIAMEN HAIWAN CHEM
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