Method and device for continuously producing terephthalic acid-1,3-propylene glycol ester

Abstract

The invention relates to a method and a device for continuously producing terephthalic acid-1,3-propylene glycol ester. In the method, an esterifiction product is obtained by esterfying terephthalic acid-and 1,3-propylene glycol ester in the presence of an esterifiction catalyst, and the terephthalic acid-1,3-propylene glycol ester is obtained by polymerizing in the presence of a polymerization catalyst. The esterifiction is carried out in at least two phases, i.e. an initial first phase and a subsequent second phase, wherein the second phase is carried out in a reactor having a plurality of communicated reaction chambers, and the reaction chambers comprise at least one initial reaction chamber, an intermediate reaction chamber and a final reaction chamber so that the materials after finishing the reaction in the first phase carries out the second phase of esterifiction reaction by sequentially passing through the initial reaction chamber, the intermediate reaction chamber and the final reaction chamber, wherein the esterifiction rate for esterifiction in the intermediate reaction chamber reaches 95-99 percent. The method comprises the steps as follows: the esterifiction catalyst and the polymerization catalyst are added from the intermediate reaction chamber, and part materials in the intermediate reaction chamber circulate to return to the first phase of reactor for esterifiction. By adopting the invention, high-quality terephthalic acid-1,3-propylene glycol ester can be produced with lower cost and higher efficiency.

Description

technical field [0001] The invention belongs to the field of organic synthesis, in particular to a preparation method and device of poly-1,3-trimethylene terephthalate (PTT). Background technique [0002] Polytrimethylene terephthalate (PTT) is a promising new polyester material successfully developed in the mid-1990s. It is a new type of organic polymer aromatic polymer belonging to the same polymer series as PET and PBT. ester products. The successful development of PTT has further enriched the series of chemical fiber products. First, unlike PET polyester, which is almost linear in macromolecular conformation, the molecular conformation of PTT polymer is helical, which allows PTT fibers to be highly "expanded", endowing PTT fibers with good elasticity; secondly, the vitrification of PTT polyester The transition temperature is low, which allows its fibers and fabrics to be dyed at low temperatures, and has excellent dyeing properties of disperse dyes; in addition, the Yo...

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Moreover, high temperature reaction is easy to form a large number of aggregated particles

Affect spinning effect

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