Method for reutilization of residue from crude terephthalic acid product

A technology for terephthalic acid and crude products, which is applied in the field of recycling and utilization of terephthalic acid crude product residues, and can solve problems such as poor comprehensive utilization, uncontrollable human control, and complicated extraction process
CN1249013CInactive Publication Date: 2006-04-05EAST CHINA UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
EAST CHINA UNIV OF SCI & TECH
Publication Date
2006-04-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention is the method of recovering and using coarse terepthalic acid (CTA) residue and the method includes adding fatty acid, dihydric alcohol and catalyst in catalytic amount to catalytically esterify to produce mixed coarse ester, with the molar ratio among residue, fatty acid and dihydric alcohol being 1.0 to 0.2-9.0 to 0.8-5.0. The present invention has the advantages of one-step esterification of CTA residue to obtain mixed ester, short technological process, saving in energy source and low cost, and the outstanding advantage is the comprehensive utilization of CTA residue as industrial resource.
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Description

technical field

[0001] The present invention relates to the recycling method of the by-product industrial solid waste in the process of oxidizing p-xylene to terephthalic acid, that is, the crude product residue of terephthalic acid (hereinafter referred to as CTA residue), especially relates to the method of combining CTA residue with fatty acid and glycol The method of preparing plasticizer through esterification reaction. Background technique

[0002] CTA residue is the benzenecarboxylic acid residue produced in the process of oxidizing p-xylene to terephthalic acid, which is based on phthalic acid (there are three isomers: ), benzoic acid, methylbenzoic acid, p-carboxybenzaldehyde and other benzene carboxylic acid mixtures as the main components.

[0003] The composition of CTA residue is complex, and its composition content varies greatly with the fluctuation of oxidation conditions. At present, CTA residue is disposed of as industrial solid waste by incineration, lan...

Claims

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