Catalyst used for dioctyl terephthalate production and use method thereof

A technology of diisooctyl terephthalate and diisooctyl phthalate, applied in the field of organic chemical industry, can solve the problem of low conversion rate of terephthalic acid, unfavorable large-scale industrialization cost, and easy deterioration and deactivation of catalysts and other issues, to achieve good product quality indicators, improve esterification efficiency, and high product yield.

Active Publication Date: 2017-09-29
JIANGSU ZHENGDAN CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, titanate is generally used as a catalyst in industrial production. The reaction time is long, and the catalyst is easily deteriorated and deactivated during the reaction process, which is very unfavorable for the reduction of large-scale industrialization costs.
The reaction temperature is high, the reaction time is long, the catalyst is easily deactivated, the conversion rate of terephthalic acid is not high, and the product yield is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Raw materials: terephthalic acid, isooctyl alcohol, methyltributylphosphine iodide, PVA17-99, n-propyl titanate. Among them, terephthalic acid and isooctyl alcohol are the main raw materials; methyltributylphosphine iodide, PVA17-99, and n-propyl titanate are the catalyst raw materials.

[0020] Put terephthalic acid and isooctyl alcohol (acid-alcohol molar ratio is 1:2.2) into the reactor, heat to 130°C for dehydration, then add 0.10% catalyst raw material relative to terephthalic acid, heat and stir, the catalyst consists of catalyst The total weight of raw materials is obtained by uniformly mixing 0.1% of methyltributylphosphine iodide, 15% of PVA17-99 and 84.9% of isopropyl titanate. During the reaction process, the water produced by the reaction was continuously removed through the water separator, the isooctyl alcohol was refluxed, and the temperature was raised to 220 ° C. When the acid value of the reaction liquid was 0.1 mgKOH / g, the reaction was stopped, and t...

Embodiment 2

[0022] Raw materials: terephthalic acid, isooctyl alcohol, ethyltributylphosphine iodide, PVA17-88, isopropyl titanate. Among them, terephthalic acid and isooctyl alcohol are the main raw materials; methyl tributylphosphine iodide, PVA17-88, and isopropyl titanate are the catalyst raw materials.

[0023] Put terephthalic acid and isooctyl alcohol (acid-alcohol molar ratio is 1:2.4) into the reactor, heat to 130°C for dehydration, and then add 0.13% catalyst by mass relative to terephthalic acid (accounting for the total weight of the catalyst raw material 0.2% ethyl tributyl phosphine iodide, 18% PVA17-88 and 81.8% isopropyl titanate are uniformly mixed) heating and stirring, during the reaction process, the water generated by the reaction is continuously removed through the water separator, and the isopropyl titanate Octanol reflux. Raise the temperature to 214°C, and the reaction can be stopped when the acid value of the reaction solution is 0.1 mgKOH / g, and the reaction ta...

Embodiment 3

[0025] Raw materials: terephthalic acid, isooctyl alcohol, ethyltributylphosphine bromide, PVA17-78, n-butyl titanate. Among them, terephthalic acid and isooctyl alcohol are the main raw materials; ethyl tributylphosphine bromide, PVA17-78, and n-butyl titanate are the catalyst raw materials.

[0026] Put terephthalic acid and isooctyl alcohol (acid-alcohol molar ratio is 1:2.6) into the reactor, heat to 130°C for dehydration, then add 0.15% catalyst by mass relative to terephthalic acid (accounting for the total weight of the catalyst raw material 0.3% ethyl tributyl phosphine bromide, 20% PVA17-78 and 79.7% n-butyl titanate are uniformly mixed) heating and stirring, during the reaction process, the water produced by the reaction is continuously removed through the water separator, and the iso Octanol reflux. Raise the temperature to 200°C, and the reaction can be stopped when the acid value of the reaction solution is 0.1 mgKOH / g, and the reaction takes 3 hours. The final ...

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Abstract

The invention discloses a catalyst used for dioctyl terephthalate production in the field of organic chemical industry and application thereof. The catalyst comprises halogenated tributyl quaternary phosphonate and macromolecule modified titanium metal compound, wherein the macromolecule modified titanium metal compound is polyvinyl alcohol modified titanate. The catalyst is used for the catalytic reaction of terephthalic acid and isooctyl alcohol to react to synthesize the dioctyl terephthalate. The catalyst has the advantages of moderate reaction temperature, short reaction time, long catalyst service life, good product color, high terephthalic acid conversion rate and high product yield.

Description

technical field [0001] The invention relates to a method for producing diisooctyl terephthalate, specifically synthesizing diisooctyl terephthalate through terephthalic acid and isooctyl alcohol in the presence of a modified titanate catalyst. It belongs to the field of organic chemical industry. Background technique [0002] Diisooctyl terephthalate (DOTP for short) is a colorless, transparent, low-viscosity liquid that is miscible with inert organic solvents but immiscible with water. DOTP is superior to di-isooctyl phthalate (DOP) in terms of physical and mechanical properties. It is an environmentally friendly new plasticizer that can replace DOP. Compared with commonly used DOP, DOTP has many irreplaceable advantages. DOTP has attracted more and more attention from the rubber and plastic industry due to its advantages of high insulation, low volatility, heat resistance, cold resistance, extraction resistance, good flexibility, and good compatibility with polyvinyl chl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J31/02C07C67/08C07C69/82
CPCB01J31/0211B01J31/0288B01J31/068B01J35/0006B01J2231/49C07C67/08C07C69/82
Inventor 曹正国任伟李江华王福储阳阳
Owner JIANGSU ZHENGDAN CHEM IND CO LTD
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