Resourceful treatment method of purified 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

Inactive Publication Date: 2008-09-03
沈福昌 +1
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  • Claims
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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; so

Method used

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  • Resourceful treatment method of purified terephthalic acid waste residue

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Embodiment 1

[0019] See figure 1 , a method for recycling purified terephthalic acid waste residues, comprising the following steps:

[0020] a. Heat the PTA waste residue to 60-100°C;

[0021] b. Use plate cabinet filter press or centrifuge to separate waste residue to obtain crude monobasic acid and dibasic acid;

[0022] c. Control the crude monobasic acid at 50-80°C, remove light components, and then carry out rectification at 180-280°C and negative pressure of 0.6-0.95Mpa to obtain benzoic acid. Cool the benzoic acid to room temperature and slice to obtain the finished product of benzoic acid.

[0023] d. The crude dibasic acid enters the reaction kettle, and one of methanol, ethanol, octanol or ethylene glycol, and sulfuric acid or titanium series, aluminum series, cobalt series catalysts are added for reaction, and the reaction temperature is controlled at 60-100 ° C. The reaction time is 2 to 10 hours;

[0024] e. The catalyzed material is decolorized with activated carbon at 50...

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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...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C63/06C07C63/15C07C63/26
CPCC07C51/493Y02P20/52
Inventor 沈福昌沈建东
Owner 沈福昌
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