Harmless recovery and incineration treatment method of purified terephthalic acid residue

Abstract

The invention discloses a method for the harmless recovery and incineration of purified terephthalic acid residues. An incinerator is used as the incineration treatment equipment, and a reaction kettle is used as the harmless recovery treatment equipment. The reaction kettle has a rectification tower, a first A condenser and a second condenser, the gas inlet of the first condenser is connected with the gas outlet of the rectification tower, the second condenser is connected in series with the first condenser, the gas inlet of the second condenser is connected with the gas outlet of the first condenser The gas outlet is connected, and the method includes the following steps: feeding, dehydrating, recovering benzoic acid, crushing waste residues, grinding waste residues, and incinerating waste residues. The present invention not only realizes waste recycling, extracts useful benzoic acid to be used as raw material for producing polyester fiber and PET resin, but also increases the amount of incineration by more than three times compared with the prior art, greatly improving the amount of incineration, and The residue is burned more fully, the harmless treatment is more thorough, more environmentally friendly, the energy consumption is low during treatment, and the process is simple and easy.

Description

technical field [0001] The invention relates to a method for treating chemical residues, in particular to a method for harmless recovery and incineration of purified terephthalic acid residues. Background technique [0002] Purified terephthalic acid (PTA) is the basic raw material for the production of polyester fiber and PET resin, and the residue of purified terephthalic acid is the chemical waste discharged during the process of preparing purified terephthalic acid. Landfill disposal or random stacking will cause pollution to the environment. The applicant applied for a patent of invention to the China Patent Office on October 10, 2001. The patent application number is 01134015.0, and the name is a method for incinerating purified terephthalic acid residues. Dehydration treatment is carried out to make the water content lower than 60%. The dehydrated material is heated by heating equipment to melt it into a paste material, and the melted paste material is sprayed into t...

AI Technical Summary

Problems solved by technology

[0003] (1) Due to direct incineration without recycling the residue, the useful resources in the residue are greatly wasted;

[0004] (2) Due to the use of paste material injection incineration method, not only the amount of incineration is small, but also the combustion is not sufficient;

[0005] (3) Since the pasty material has a certain amount of moisture, the flue gas processing capacity and processing difficulty of the incinerator are increased;

[0006] (4) Due to the spraying and incineration method of paste-like materials, the paste-like materials fall onto the grate of the incinerator, causing coking, and the furnace needs to be shut down frequently for cleaning, which increases the workload of operators and reduces the efficiency of residue treatment ;

[0007] (5) Since the molten paste material is sprayed into the incinerator for incineration, it is necessary to apply external compressed air with a temperature not lower than 50°C, which increases the cost of residue treatment

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