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

A technology of polyterephthalic acid and terephthalic acid, which is applied in the field of organic synthesis, can solve the problems affecting the spinning effect and achieve the effects of reduced residence time, high esterification rate and excellent product performance

Active Publication Date: 2010-02-24
JIANGSU ZHONGLU TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, high temperature reaction is easy to form a la

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 As shown, according to the present invention, the device for continuous production of PTT mainly includes beating kettle 7, the first esterification reactor 1, the second esterification reactor 2, esterification rectification tower 3, the first polymerization reactor 50, the second The polymerization reactor 51, the third polymerization reactor 52 and the supporting vacuum system 8. In addition, the device also includes some other supporting facilities such as auxiliary modulation and recovery equipment, all of which are well-known technical contents in the field, and conventional technologies can be used, and will not be described in detail here. In addition, it should also be understood that any reaction in the production of PTT polyester is carried out under stirring conditions or conditions equivalent to stirring, so the supporting facilities should at least cover stirring devices or provide similar stirring devices.

[0039] The second esterificat...

Embodiment 2

[0043] A method for continuous production of PTT, using figure 1 As shown in the apparatus, the method is as follows:

[0044] 1) In the beating tank, 1,3-propanediol and terephthalic acid were mixed at a molar ratio of 1.12:1, and then the mixed slurry was transported to the first esterification reactor 1 at a flow rate of 7.918 tons / hour.

[0045] 2) A titanium-tin-cobalt composite system is used as an esterification catalyst and a polymerization catalyst, and the titanium-cobalt-nickel composite system is composed of isopropyl titanate, titanium ethylene glycol, tin oxide dilaurate, and cobalt chloride.

[0046] 3) The above-mentioned titanium-tin-cobalt composite catalyst is made into a preparation liquid according to the following method: the titanium-tin-cobalt composite catalyst is mixed with 1,4-cyclohexanedicarboxylic acid and neopentyl glycol, heated and dissolved to obtain a preparation liquid, The requirements for each component in the formulated liquid are: the c...

Embodiment 3

[0055] A method for continuous production of PTT, using figure 1The device shown is basically the same as in Example 1, except that the molar ratio of 1,3-propanediol to terephthalic acid is 1.25:1.

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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...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/78C08G63/85C08G63/16C08G63/688
Inventor 边树昌
Owner JIANGSU ZHONGLU TECH DEV
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