Process for preparing poly trimethylene terephthalate

A technology of polytrimethylene terephthalate and terephthalic acid, which is applied in the field of manufacturing polytrimethylene terephthalate, can solve the problems of low intrinsic viscosity and high content of carboxyl end groups, and achieve reduced reaction time and low carboxyl end content , the effect of reducing the content of by-products

Inactive Publication Date: 2005-01-19
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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Problems solved by technology

[0004] The defect that all these existing methods exist is that the end carboxyl group content of the PTT product that obtains is higher, intrinsic viscosity is lower, is difficult to surpass 0.91dl / g usually

Method used

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Embodiment 1～8

[0029] 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;

[0030] The stabilizer trimethyl phosphate and an appropriate amount of 1,3-propanediol are prepared into a solution and added to the reaction system. The addition amount of the stabilizer is based on the terephthalic acid in the reaction system, the addition amount is 15ppm, and the reaction is carried out under normal pressure for 10 to 30 minutes;

[0031] 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 p...

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Abstract

The invention discloses a process for preparing poly trimethylene terephthalate from terephthalic acid and 1,3-propylene glycol which comprises, subjecting terephthalic acid and propylene glycol to esterification reaction, conducting pre-polycondensation reaction to the esterification reactants, cutting the polycondensation polymer into granules, these reactions are conducted at the presence of a composite catalyst, which is a composition comprising titanium dioxide, silica and molybdenum oxidation.

Description

technical field [0001] The present invention relates to a kind of method of producing polytrimethylene terephthalate by terephthalic acid and 1,3-propanediol, the reaction process undergoes esterification, precondensation and polycondensation, and esterification, precondensation and polycondensation are carried out in titanium-containing In the presence of an inorganic compound and a molybdenum inorganic compound catalyst. 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, it is a polyester polymer material that can be industrialized to produce fibers. In addition to the chemical resistance of PET fiber, PTT fiber also has excellent elastic recovery and recovery rate, and its inherent stain res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/181C08G63/78
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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