Resourceful treatment method of purified terephthalic acid waste residue

Abstract

The invention relates to a process method for resource utilization of fine terephthalic acid waste residue, comprising: heating up the fine terephthalic acid waste residue to dissociate to obtain coarse monobasic acid and dibasic acid; removing light component in the coarse monobasic acid and then rectifying to obtain benzoic acid; adding alcohol and sulfuric acid, or titan series, aluminium series, or cobalt series catalytic agents to the coarse dibasic acid for reacting, decolorizing with activated carbon, obtaining terephthalic acid ester products after neutralization, water washing and rectification; sending the residue after rectification to a fuel-exemption incinerator for burning process, and abstracting rare metals such as cobalt and manganses in the ash from burning. The method for processing fine terephthalic acid waste residue can abstract chemical industry products like benzoic acid and terephthalic acid, and the rare metals like cobalt and manganses; the waste residue without utility value can be treated by burning having no using for any fuel to use the waste residue as a fuel and also to reclaim and reuse the calorific energy form burning, and the invention realizes the resource utilization, innocuity and reduce of quantity for chemical waste residue, can meet the require of cycle economy and environmental protection.

Description

technical field [0001] The invention relates to a resourceful treatment method of chemical waste residue, in particular to a resourceful treatment method of purified terephthalic acid waste residue. Background technique [0002] Purified terephthalic acid (PTA) is the basic raw material for the production of polyester fiber and PET resin. Purified terephthalic acid residue is the chemical waste discharged during the production process of purified terephthalic acid. Its composition is relatively complex. The main components are benzoic acid, terephthalic acid, p-phenylbenzoic acid, p-carboxybenzaldehyde, Dicarboxylic acid, isophthalic acid, phthalic acid and condensates, etc. Most of the processing methods of PTA waste residues by foreign major PTA manufacturers are through incineration, and coal or fuel oil is used to burn off the organic acids in the waste residues. Such residue treatment methods are harmful to resources and energy. cause great waste; some domestic PTA pr...

AI Technical Summary

Problems solved by technology

Most of the processing methods of PTA waste residues by foreign major PTA manufacturers are through incineration, and coal or fuel oil is used to burn off the organic acids in the waste residues. Such residue treatment methods are harmful to resources and energy. cause great waste; some domestic PTA production enterprises wash the PTA waste slag with water to recycle the cobalt acetate and manganese acetate, and the waste slag is stacked in the open air or diluted with a large amount of water. The environment is seriously polluted and precious resources are wasted

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