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Full-mixing esterification device and method in PBAT production process

A production process and chemical device technology, applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problems of high investment cost of PBAT, small production capacity, low esterification efficiency, etc., and improve the esterification efficiency. , to avoid the back mixing of materials and improve the efficiency of esterification

Pending Publication Date: 2022-01-04
华峰集团上海工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The stirred esterification kettle is an intermittent reaction kettle, which results in low esterification efficiency of BHBT and BSA, and is limited by the strength of the stirring shaft and blades and the heat exchange area. The production capacity of a single equipment is small, and it is suitable for large-scale production of PBAT The demand can only be increased by increasing the number of stirred esterification tanks, which also leads to higher investment costs for the production of PBAT

Method used

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  • Full-mixing esterification device and method in PBAT production process

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Embodiment 1

[0040] see figure 1 , is a specific embodiment of a fully mixed esterification device in the production process of PBAT. The fully mixed esterification device in the PBAT production process includes a reactor 1 and a flash tank 2. In this embodiment, the reactor includes a micro-interface generator, a coiled pipe, and a closed shell, and the closed shell extends vertically. The coiled tube of the housing is a material channel, and the space between the material channel and the housing is a heat medium channel. The medium inlet of the medium channel is located at the upper part of the side wall of the housing, and the medium outlet of the medium channel is located at the side of the housing. In the lower part of the wall, the heat medium channel uses a mixture of biphenyl and diphenyl ether as the heat medium. The mass ratio of biphenyl and diphenyl ether is 1:3. The material channel extends in a reciprocating bend in the inner space of the shell. Specifically , the pipeline i...

Embodiment 2

[0042] The method for synthesizing BAT using the fully mixed esterification device of embodiment 1 may further comprise the steps:

[0043] 1) BSA (butylene adipate, obtained from the AA / BDO esterification process), BHBT (bishydroxybutyl terephthalate, obtained from the PTA / BDO esterification process) in a molar ratio of 1:1, Enter the material channel of the reactor through the micro interface generator with the catalyst (tetrabutyl titanate, the addition amount is 0.1-0.5kg / tPBAT) to carry out the esterification reaction, and the inlet of the medium channel is passed into the gaseous heat medium (biphenyl Mixed with diphenyl ether at a mass ratio of 1:3), exothermic and liquefied, discharged from the outlet of the medium channel, and formed a cycle after vaporization, so that the temperature of the internal esterification reaction in the material channel is 200-270 ° C, in the material channel 1.5h of the time, obtain the mixture of BAT, oligomer;

[0044] 2) The mixture of B...

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Abstract

A full-mixing esterification device in a PBAT production process comprises a reactor and a flash tank, a material channel inlet of the reactor is used for being connected with a BSA source, a BHBT source and a catalyst source, a micro-interface generator is arranged at the material channel inlet, a material channel outlet of the reactor is connected with the flash tank, a bottom liquid outlet of the flash tank is used for discharging BAT outwards, a top steam exhaust port of the flash tank is connected with a vacuum separator through a condenser, and non-condensable gas outlets of the condenser and the vacuum separator are both connected with a negative pressure source. The device is simple in structure and convenient to operate, the operation efficiency is greatly improved, the production requirement for large-scale production of PBAT can be met at low cost, the esterification rate of BSA and BHBT can be effectively increased to 98.5% or above in the BAT synthesis process, material backmixing can be effectively avoided, the load of the esterification steam separation procedure is relieved, and energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a fully mixed esterification device and method in the production process of PBAT. Background technique [0002] Plastics currently used in large quantities, such as polyvinyl chloride, polyethylene, polypropylene, etc., are not biodegradable, forming a large amount of white garbage and causing serious environmental pollution. The use of incineration produces harmful gases such as fly ash and dioxin, which seriously pollutes the atmosphere and poses a serious threat to human health. [0003] Degradable plastics have great practical significance for environmental protection and sustainable development, and the production and use of bio-based degradable plastics is imperative. [0004] PBAT (polybutylene adipate terephthalate), is a copolymer of PTA (terephthalic acid), BDO (1,4 butanediol), AA (adipic acid), PBAT has good Ductility, elongation at break, heat resistance and impact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/00B01J19/00C08G63/183C08G63/85
CPCB01D3/009B01J19/0093C08G63/183C08G63/85
Inventor 姜国新孟启贵宋立新徐忠哲王烨
Owner 华峰集团上海工程有限公司
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