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Titanium composite catalyst for polyester and copolyester synthesis

A composite catalyst and copolyester technology, which is applied in the field of preparation of titanium-based composite catalysts, can solve problems such as yellowish color and poor thermal stability of products

Inactive Publication Date: 2004-12-08
中国石化集团天津石油化工公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The titanium-based catalysts developed by the above-mentioned companies maintain high catalytic activity, but the product has poor thermal stability and yellowish color, which is manifested in a high b value. Therefore, while maintaining the high activity of the catalyst, improving the hue is the key to the development of titanium-based catalysts. difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of Catalyst Ti / Si / / Mg / Mn / Co by Co-precipitation

[0033] With 0.30g (1.5mmol) magnesium acetate tetrahydrate, 0.37g (1.5mmol) manganese acetate tetrahydrate, 1.3g (4.47mmol) cobalt nitrate hexahydrate, 11.37g (40mmol) isopropyl titanate, 0.52 g (2.5 mmol) of tetraethyl orthosilicate was dissolved in 200 ml of ethanol to obtain solution A; 0.66 g of NaOH was dissolved in 18 g of water, and 50 ml of ethanol was added to obtain solution B. Solution B was added dropwise to solution A at laboratory temperature for 40 minutes to form a precipitate, and then continued to stir for 1 hr. The precipitate was separated, washed with water, dried in vacuum for 20 hours, and pulverized to obtain a powdery polycondensation catalyst.

Embodiment 2

[0035] Preparation of Catalyst Ti / Si / / Mg / Mn / Co by Fractional Precipitation

[0036] The first step: 0.30g (1.5mmol) of magnesium acetate tetrahydrate, 0.37g (1.5mmol) of manganese acetate tetrahydrate, and 1.3g (4.47mmol) of cobalt nitrate hexahydrate were dissolved in 150ml of ethanol to prepare solution A , Dissolve 0.66g NaOH in 18g water, add 50ml ethanol to prepare solution B. Add solution B dropwise to solution A at laboratory temperature for 30 minutes to form a precipitate, and continue stirring for 15 minutes. The second step: 11.37g (40mmol) of isopropyl titanate and 0.52g (2.5mmol) of tetraethyl orthosilicate were dissolved in 50ml of ethanol to prepare solution C, and solution C was added dropwise at laboratory temperature Into the mixture prepared in the first step, add dropwise for 30 minutes, and then continue to stir for 1 hr. The precipitate is separated, dried and pulverized to obtain a powder polycondensation catalyst.

Embodiment 3

[0038] Preparation of Catalyst Ti / Si / / Mg / Mn / Co by Partial Co-precipitation and Sub-step Precipitation

[0039] The first step: dissolve 0.30g (1.5mmol) of magnesium acetate tetrahydrate, 0.37g (1.5mmol) of manganese acetate tetrahydrate, and 1.3g (4.47mmol) of cobalt nitrate hexahydrate in 150ml of ethanol, and then add 5.69g (20mmol) of isopropyl titanate, 0.26g of 1.25mmol) of tetraethyl orthosilicate to prepare solution A; dissolve 0.66g of NaOH in 18g of water, and add 50ml of ethanol to prepare solution B. Solution B was added dropwise to solution A at laboratory temperature for 20 minutes to obtain a precipitate, and then continued to stir for 0.5 hr. The second step: dissolve the remaining 5.69g (20mmol) of isopropyl titanate and 0.26g (1.25mmol) of tetraethyl orthosilicate in 50ml of ethanol to prepare solution C, and dissolve solution C at laboratory temperature Add it dropwise to the mixture prepared in the first step for 25 minutes, and then continue stirring for 1...

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Abstract

A Ti-series composite catalyst for the polycondensation reaction in synthesizing polyester and copolyester is prepared from isopropyl (or tetrabutyl) titanate, a compound of the element in IVA family and the compounds of 1-3 metal elements chosen from IA, IIA, IIIA, IIIB, VIIB and VIII families through alkaline hydrolysis and deposition. Its advantage is high activity.

Description

technical field [0001] The invention relates to a preparation method of a titanium series composite catalyst which can be used as a polycondensation reaction catalyst in the synthetic process of polyester and copolyester. Background technique [0002] Polyester, especially polyethylene terephthalate (PET), is widely used due to its various excellent properties. In particular, polyester fiber is the largest variety of synthetic fiber and has always dominated the chemical fiber market. In the past few years, due to the strong demand, major polyester manufacturers have expanded their production capacity, resulting in overcapacity of PET in the world, lower product prices, and fierce market competition. In order to improve market competitiveness, polyester companies have been seeking effective ways to reduce polyester costs in addition to constantly adjusting product structure and developing non-fiber polyester. At present, there are two effective methods that can effectively r...

Claims

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Application Information

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IPC IPC(8): C08G69/28
Inventor 郭灵通臧国强李明玉张媛黄震宇张丽梅
Owner 中国石化集团天津石油化工公司
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