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Preparation method of titanium series catalyst for polyester

A technology of titanium-based catalysts and polyesters, applied in the field of preparation of titanium-based catalysts, can solve the problems of poor light stability of titanium

Inactive Publication Date: 2007-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the problem of poor light stability of titanium existing in the prior art, and a new method for preparing a titanium-based catalyst for polyester is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of Catalyst A

[0030] Add 154 grams (0.8 moles) of citric acid monohydrate and 308 grams of isopropanol into a reactor equipped with a stirrer, a condenser and a thermometer, stir to dissolve the citric acid, and slowly drop tetraisopropyl titanate into the reactor 114 grams (0.4 moles) of ester, 30 DEG C of heating and refluxing for one hour, evacuating the isopropanol to obtain a solid substance, adding 200 grams of water to dissolve it, then adding ammonia water to neutralize the pH value of the system to about 7, to obtain a light Yellow transparent liquid, water was evaporated in vacuum to obtain white crystalline titanium citrate compound powder, the titanium content of which was 8.9% by weight according to plasma emission spectrometry analysis.

[0031] 2.70 grams (0.005 moles) of titanium citrate compound were dissolved in 10 grams of ethylene glycol to obtain a light yellow transparent liquid, and 2.06 grams (0.005 millimoles) of 50% aqueous soluti...

Embodiment 2

[0036] Preparation of Titanium Catalyst B

[0037] Catalyst B was prepared by a method similar to catalyst A, except that the reflux temperature for preparing the titanium compound was 100° C. and the time was 4 hours; the reaction temperature in step (2) was 25° C. and the reaction time was 3 hours. In step (3), The reaction temperature is 30° C., the reaction time is 3 hours, and 2.06 g of hydroxyethylidene diphosphonic acid is replaced with 5.40 g (0.01 mole) of 2-phosphonobutane-1,2,4-tricarboxylic acid. Catalyst B calculates that its titanium content is 1.25% by weight

[0038] Preparation of polyester

[0039] Polyester was prepared by the same method as in Example 1, using 0.694 g of Catalyst B as a catalyst (based on the amount of polyester produced, the weight of titanium atoms was 15 ppm).

[0040] The test results are shown in Table 1.

Embodiment 3

[0042] Catalyst C preparation

[0043] Catalyst C was prepared in a similar manner to catalyst A, except that 1.15 g (0.01 mol) of 85% phosphoric acid was replaced by 1.58 g (0.01 mol) of phenylphosphoric acid. Catalyst C has a titanium content of 1.47% by weight based on the feed.

[0044] Preparation of polyester

[0045] Polyester was prepared by the same method as in Example 1, using 0.590 g of Catalyst C as a catalyst (based on the amount of polyester produced, the weight of titanium atoms was 15 ppm).

[0046] The test results are shown in Table 1.

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PUM

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Abstract

The invention discloses a preparing method of titanium-system catalyst of polyester, which is characterized by the following: reacting titanic acid ester and 2-hydroxy carboxylic compound and organic phosphonic acid compound; making the product react with at least one phosphorus compound of phosphoric acid, phosphorous acid, hypophosphorous acid, phosphate ester or phosphite ester; fitting for polyester industry.

Description

technical field [0001] The invention relates to a preparation method of a titanium series catalyst for polyester. Background technique [0002] Polyethylene terephthalate is an important industrial raw material, which can be widely used in fibers, sheets, films and other materials. [0003] The research on polyester catalysts has never stopped since the advent of polyester. At present, the polyester catalysts with more industrial production and research are mainly three series of catalysts: antimony, germanium and titanium. Among them, the most commonly used antimony series catalysts (including Sb 2 o 3 , SbAc 3 and ethylene glycol antimony, etc.), currently 90% of polyester in the world is produced by antimony catalysts. The disadvantages of antimony-based catalysts are: low activity; heavy metal catalysts pollute the environment; polymers are gray. The germanium-based catalyst has good stability, causes fewer side reactions during the reaction process, and produces a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/85
Inventor 沈志刚周文乐赵微微陈丽娟
Owner CHINA PETROLEUM & CHEM CORP
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