Resource treatment method for fine terephthalic acid waste residue

A technology of purified terephthalic acid and its treatment method, which is applied in the field of resourceful treatment of purified terephthalic acid waste residue, can solve problems such as environmental pollution, waste of valuable resources, waste of resources, and energy, and meet the requirements of circular economy and environmental protection required effect

Active Publication Date: 2009-08-26
TAIXING FUCHANG SOLID WASTE TREATMENT CO LTD
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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 valuable resources are wasted

Method used

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  • Resource treatment method for fine terephthalic acid waste residue

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Embodiment Construction

[0019] Put the PTA waste residue into the kettle, heat to 80°C, and stir at the same time to dissolve the benzoic acid, and use a centrifuge to centrifuge while it is hot. The obtained filtrate is crude monobasic acid (the quality is 43% of the original residue), and the filter residue is crude dibasic acid (the quality is 56% of the original residue).

[0020] Put the crude monobasic acid into the kettle, adjust the temperature to 60-70°C, evaporate and condense the light components into waste water; raise the temperature of the remaining liquid after removing the light components to 200-220°C, control the pressure at about 0.8Mpa, and carry out Rectification, worth benzoic acid with a purity of 98.5%.

[0021] The thick dibasic acid (acid value 568.46gKOH / kg, content is 80%) residue is placed in the reaction kettle, add ethanol (add 920 grams of ethanol in every kilogram of crude dibasic acid) and concentrated sulfuric acid (the addition amount is crude dibasic acid 4% of t...

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Abstract

The invention relates to a resource treatment method for fine terephthalic acid waste residue, which includes steps of heating and separating the fine terephthalic acid waste residue to obtain crude monoacid and dibasic acid; removing light component from the crude monoacid, and rectifying to obtain benzoic acid; adding alcohol and sulfuric acid or titanium series, aluminum series or cobalt series catalyst into the crude dibasic acid to react, using activated carbon to decolor, neutralizing, washing by water and rectifying to obtain terephthalic acid ester product; feeding rectified residue to fuel-free incinerator to burn, and extracting rare metal such as cobalt and manganese from ash generated by burning. By adopting the method to treat fine terephthalic acid waste residue, chemical product such as benzyl acid and terephthalic acid and rare metal such as cobalt and manganese can be extracted; worthless waste residue is burned without any fuel, the waste residue can be used as fuel, and the heat energy generated by burning can be recycled to realize resource, harmlessness and quantitative reduction of chemical waste residue treatment and accord with circular economy requirement and environmental protection requirement.

Description

technical field [0001] The invention relates to a method for resourceful treatment of chemical waste residue, in particular to a method for resourceful treatment 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 domesti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCC07C51/493Y02P20/52
Inventor 沈福昌沈建东
Owner TAIXING FUCHANG SOLID WASTE TREATMENT CO LTD
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