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Composite esterification and polycondensation catalyst for preparing poly trimethylene terephthalate

A poly(trimethylene terephthalate) and composite catalyst technology, applied in the field of composite catalysts, can solve the problems of high carboxyl end content and low intrinsic viscosity, and achieve the effects of low carboxyl end content, reduced reaction time, and high ether content

Inactive Publication Date: 2006-08-30
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0004] The defect that all these existing catalysts exist is that when it is used in the corresponding preparation method, the end carboxyl group content of the PTT product obtained is higher, intrinsic viscosity is lower, is difficult to exceed 0.91dl / g usually

Method used

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Examples

Experimental program
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Effect test

Embodiment 1～8

[0023] Put terephthalic acid and propylene glycol into the reactor, the feeding molar ratio is terephthalic acid: propylene glycol = 1: (1.6-2.0), and the required amount of composite catalyst is added, and the system is stirred to carry out esterification reaction. The reaction temperature is 210-250°C, the reaction pressure is 0.1-0.3MPa, the water formed during the reaction is distilled, and the reaction time is 120-150 minutes;

[0024] The stabilizer trimethyl phosphate and an appropriate amount of 1,3-propanediol are prepared into a solution and added to the reaction system. The added amount of the stabilizer is based on the terephthalic acid in the reaction system, and the added amount is 15 ppm. React under normal pressure for 10-30 minutes;

[0025] Continue the precondensation reaction, the reaction temperature is 230-255 ° C, and the pressure is gradually reduced at the beginning of the reaction until the pressure is 0.3-1KPa absolute pressure, and the reaction tim...

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Abstract

The invention discloses a composite esterification and polycondensation catalyst for preparing poly trimethylene terephthalate, wherein the composite catalyst is a composition containing titanium dioxide, silicon dioxide and molybdenum trioxide. The prepared PTT product has very low end carboxyl content, ether content and rather high characteristic viscosity.

Description

technical field [0001] The invention relates to a composite catalyst used in the esterification and polycondensation process of producing poly(trimethylene terephthalate) from terephthalic acid and 1,3-propanediol. The composite catalyst contains an inorganic compound of titanium and an inorganic compound of molybdenum. Background technique [0002] Polytrimethylene terephthalate (PTT) is an aromatic polyester synthesized by esterification and polycondensation of terephthalic acid (PTA) and 1,3-propanediol (PDO). After the industrialization of ethylene glycol diformate (PET) and the industrialization of polybutylene terephthalate (PBT) in the 1970s, the industrial production of fiber-forming polyester polymer materials was realized. In addition to the chemical resistance of PET fiber, PTT fiber also has excellent elastic recovery and recovery rate, and its inherent stain resistance, antistatic property and color fastness are also very good. In addition, PTT also has a wide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/85
Inventor 陈克权张飚陈恩庆瞿中凯严国良王良生马雪琳任明利
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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