Catalyst for preparing trimethylene terephthalate

A technology of propylene glycol terephthalate and a catalyst, which is applied in the field of high-efficiency esterification catalysts, and can solve problems such as low esterification rate, long reaction time, and application limitations of PTT polyester

Inactive Publication Date: 2007-02-07
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The catalysts used in these patented technologies have the following disadvantages for the esterification process: the reactio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] To a 50 mL flask equipped with a stirrer was added 8.307 g of PTA, 7.18 mL of 1,3-PDO and 100 ppm [n-Bu 2 Sn(OH)(OSO 2 CH 3 )] 2 Catalyst (calculated as PTA), equipped with a rectifying column and a temperature control system, feed high-purity nitrogen, stir, gradually increase the temperature, control the temperature at 220-270 ° C, and distill the generated water as the reaction progresses, and obtain a uniform solution after 4.0 hours. , Transparent liquid, solid after cooling to room temperature.

[0015] Add the product of the esterification reaction to the phenol / 1,1,2,2-tetrachloroethane solution, heat to dissolve, add methanol, filter and dry the solid under reduced pressure to obtain BHPT. The experimental results are shown in Table 1.

Embodiment 2～8

[0017] Except that catalyst is different, other conditions are the same as embodiment 1, and the obtained results are shown in Table 1.

[0018]

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PUM

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Abstract

The invention relates to a catalyst for preparing benzene dicarboxylic acid methyl glycol, which uses benzene dicarboxylic acid and 1, 3-methyl glycol, wherein said catalyst is beryllium organic tin compound, whose formula is [R2SnML]2; R is alkyl group, etc; M, L is replace group, as halide, hydroxyl group, alkoxy, phenoxy, etc; M and L can be same or different.

Description

technical field [0001] The invention relates to an efficient esterification catalyst for preparing propylene glycol terephthalate from terephthalic acid and 1,3-propanediol. The catalyst is a dialkyl organotin compound. Background technique [0002] Polytrimethylene terephthalate (PTT) is a new type of thermoplastic aromatic polyester polymerized from propylene terephthalate (BHPT). Softness, the bulkiness of acrylic fiber and the stain resistance of polyester, together with its inherent elasticity, moderate glass transition temperature and good processing performance, integrate the excellent wearability of various fibers into one, and has become the most popular fabric in the world. One of the hot new polymer materials. It is not only used in the field of synthetic fibers, but also develops rapidly in the fields of engineering plastics, and is more suitable for use in carpets, textile fibers, monofilaments, films, and engineering plastics. [0003] The monomer of PTT poly...

Claims

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Application Information

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IPC IPC(8): B01J31/12C07C67/03C07C69/82
Inventor 王公应贾树勇杜治平姚洁曾毅王越
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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