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Composite catalyst for preparing modified polyester

A technology of composite catalyst and modified polyester, which is applied in the field of composite catalyst, can solve the problems of increased side reactions, lower product quality, and poor color of polyester slices, and achieve the effect of less side reactions and shortened time

Inactive Publication Date: 2007-01-10
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this method, if the existing titanium-containing or antimony-containing catalysts are used, the polycondensation reaction time can be reduced by increasing the amount of the catalyst, but the result will increase the side reactions, making the color of the polyester chips worse and the product quality lower.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A 2-liter stainless steel pressure reactor is configured with a rectification column, a condenser and a vacuum system. Put 846 grams of purified terephthalic acid, 150 grams of isophthalic acid and 484 grams of ethylene glycol into the reactor, and add the composite catalyst.

[0019] The molar ratio of raw materials is:

[0020] (terephthalic acid + isophthalic acid): ethylene glycol = 1: 1.3

[0021] Terephthalic acid: isophthalic acid = 1: 0.177

[0022] The proportioning of composite catalyst is:

[0023] Titanium dioxide 0.165 g

[0024] Silicon dioxide 0.014 g

[0025] Molybdenum trioxide 0.014 g

[0026] Manganese acetate tetrahydrate 0.082 grams (equivalent to 0.058 grams of manganese acetate)

[0027] 0.122 grams of zinc acetate dihydrate (equivalent to 0.102 grams of zinc acetate)

[0028] Based on the total amount of terephthalic acid and isophthalic acid in the reaction system, based on the total amount of titanium dioxide and silicon dioxide in the c...

Embodiment 2

[0032] The proportioning of composite catalyst is:

[0033] Titanium dioxide 0.170 g

[0034] Silicon dioxide 0.012 g

[0035] Molybdenum trioxide 0.034 g

[0036] Manganese acetate tetrahydrate 0.082 grams (equivalent to 0.058 grams of manganese acetate)

[0037] 0.122 grams of zinc acetate dihydrate (equivalent to 0.102 grams of zinc acetate)

[0038] All the other are with embodiment 1.

Embodiment 3

[0040] The proportioning of composite catalyst is:

[0041] Titanium dioxide 0.206 g

[0042] Silicon dioxide 0.013 g

[0043] Molybdenum trioxide 0.021 g

[0044] Manganese acetate tetrahydrate 0.082 grams (equivalent to 0.058 grams of manganese acetate)

[0045] 0.122 grams of zinc acetate dihydrate (equivalent to 0.102 grams of zinc acetate)

[0046] Based on the total amount of terephthalic acid and isophthalic acid in the reaction system, the total amount of titanium dioxide and silicon dioxide in the catalyst is 220 ppm. All the other are with embodiment 1.

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PUM

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Abstract

The invention discloses a composite catalyst for preparing modified polyester, wherein the modified polyester employs terephthalic acid, m-phthalic acid and ethylene glycol as monomers, while the catalyst is a composition of a compound containing titanium dioxide, silicon dioxide, molybdenum, zinc acetate and a composition A, the molybdenum containing compound is selected from any one of molybdenum oxide or molybdenum sulfide or the mixture of the two, the compound A is selected from any one of manganese acetate or manganese chloride or the mixture of the two.

Description

technical field [0001] The invention relates to a composite catalyst for producing modified polyester from terephthalic acid, isophthalic acid and ethylene glycol. The composite catalyst contains titanium dioxide, silicon dioxide, molybdenum-containing compounds and the like. Background technique [0002] The polyester used to make high-shrinkage polyester fibers can be prepared by chemical modification, which is to change the components of the reactive diacid or the component of the reactive diol in the polyester monomer, that is, to use other diacids to partially To replace terephthalic acid, or to use other glycols to partially replace ethylene glycol. Partially replacing terephthalic acid with isophthalic acid is a commonly used method, and its advantages are lower cost and better product performance, such as Japanese Patent Laid-Open 5-302210, Patent Laid-Open 9-78345, and Patent Laid-Open 9-9- 132832 and JP-9-228154 introduced. The disadvantage of this method is that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/85
Inventor 陈恩庆瞿中凯钱瑛杜欣庄张技明
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD