Purified terephthalic acid residue recycling and incineration treatment method

Abstract

The invention discloses a purified terephthalic acid residue recycling and incineration treatment method. An incinerator serves as an incineration treatment device, a reaction kettle is adopted as a resource recycling treatment device, the reaction kettle is provided with a rectifying tower, a first condenser and a second condenser, the first condenser is provided with a gas inlet and a liquid outlet, the second condenser is provided with a gas inlet and a liquid outlet, and the gas inlet of the first condenser and the gas inlet of the second condenser communicate with a gas outlet of the rectifying tower. The method comprises the following steps of feeding, dewatering, benzoic acid recycling, waste residue crushing, waste residue grinding and waste residue incineration. According to the method, useful resources in residues can be effectively extracted, resource recycling is achieved, and waste recycling is carried out on the residues. Besides, compared with the prior art, the incineration amount is improved by more than three times, the incineration amount is greatly improved, combustion of the residues is more sufficient, harmless treatment is more thorough and more environmentally friendly, the energy consumption during treatment is low, the process is simple and feasible, and the residue treatment cost is lower.

Description

technical field [0001] The invention relates to a treatment method for chemical residues, in particular to a recycling and incineration treatment method for 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...

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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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