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Method for comprehensive recycling of crude terephthalic acid (CTA) residue

A technology of resource utilization and residue, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of inconvenient operation, large investment, energy consumption, etc., and achieve high economic and social benefits.

Active Publication Date: 2011-10-05
FUJIAN TIANDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have disadvantages such as inconvenient operation, energy consumption, large investment and the risk of secondary pollution.

Method used

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  • Method for comprehensive recycling of crude terephthalic acid (CTA) residue
  • Method for comprehensive recycling of crude terephthalic acid (CTA) residue
  • Method for comprehensive recycling of crude terephthalic acid (CTA) residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The first step is to prepare mixed organic isooctyl ester from CTA residue

[0039] Put 4kg of CTA residue, catalyst and 9.1kg of isooctyl alcohol into the reaction kettle and raise the temperature to 225℃, keep the reaction temperature, reflux for about 10 hours, measure the acid value until the acid value ≤0.5mg koh / g, stop the reaction, and produce the crude The ester enters the next process.

[0040] The second step of dealcoholization

[0041] The isooctyl alcohol in the crude ester is recovered and used in the next batch of production. The recovery is divided into three processes: normal pressure dealcoholization, vacuum dealcoholization and steam stripping dealcoholization. Atmospheric dealcoholization means that the alcohol in the crude ester is steamed out under normal pressure. Vacuum dealcoholization refers to the distillation and dealcoholization under vacuum. The steam stripping dealcoholization is based on the principle of partial pressure. The trace amount of ...

Embodiment 2

[0054] It is basically the same as Example 1, except that in the first step: Put 4kg of CTA residue, catalyst and 9.45kg of isooctanol into the reactor and raise the temperature to 240°C, keep it for reaction, reflux for about 8 hours, and measure the acid Until the acid value is less than or equal to 0.5 mg koh / g, the reaction is terminated, and the crude ester produced enters the next step.

Embodiment 3

[0056] It is basically the same as Example 1, except that in the first step: Put 4kg of CTA residue, catalyst and 9.8kg of isooctyl alcohol into the reaction kettle and raise the temperature to 220°C, keep the temperature for reaction, reflux for about 12 hours, and measure the acid Until the acid value is less than or equal to 0.5 mg koh / g, the reaction is terminated, and the crude ester produced enters the next step.

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Abstract

The invention discloses a method for comprehensive recycling of crude terephthalic acid (CTA) residue. The method comprises: esterifying the CTA residue to obtain mixed diisooctyl phthalate, isooctyl methyl benzoate and isooctyl benzoate; and separating to obtained mixed diisooctyl phthalate, which serves as a heavy component, and a mixture of isooctyl methyl benzoate and isooctyl benzoate, whichserves as a light component, wherein the mixed diisooctyl phthalate is a plasticizer that can be used directly; and the mixture of isooctyl methyl benzoate and isooctyl benzoate can be formed into a mixture of (methyl) benzoic acid diethylene glycol ester by interesterification; the mixture of (methyl) benzoic acid diethylene glycol ester is also a high-performance plasticizer; and thus, all CTA residue is used for producing plastic products, the comprehensive recycling of the CTA residue is realized, and high economic benefit and social benefit are created.

Description

Technical field [0001] The present invention relates to the field of chemical industry, in particular to a method for comprehensive utilization of CTA residues in a PTA production process. Background technique [0002] Purified terephthalic acid (PTA) is one of the main raw materials for polyester chips and polyester fibers. The domestic production capacity has exceeded 12 million tons per year, and there is still huge room for growth. The main by-product produced in the PTA production process is the CTA residue of the para-xylene chemical section, which accounts for about three to five thousandths of the PTA output. The main component of the residue is mixed phthalic acid and methylbenzene. Formic acid, benzoic acid, etc., the conventional harmless treatment methods are incineration and sewage treatment. Both of these methods have disadvantages such as inconvenient operation, energy consumption, large investment, and the risk of secondary pollution. Summary of the invention [...

Claims

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Application Information

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IPC IPC(8): C07C69/80C07C69/78C07C67/08C07C67/03C08K5/12C08K5/103
CPCC08K5/103C08K5/12C07C67/08C07C67/03
Inventor 黄珍华李凌
Owner FUJIAN TIANDA CHEM
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