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Esterification device and method for AA and BDO in PBAT production process

A production process and esterification technology, which is applied in the field of AA and BDO esterification equipment, can solve the problems of limited production capacity of a single kettle-type esterification kettle, high investment cost of PBAT, and high cost of separating BDO, so as to improve the efficiency of esterification , reduce energy consumption, and shorten the esterification time

Pending Publication Date: 2021-10-15
华峰集团上海工程有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stirred esterification reactor is a discontinuous reactor, which results in low esterification efficiency of AA and BDO, and it is necessary to add excess BDO to ensure that the esterification reaction proceeds in a positive direction, resulting in higher costs for subsequent separation of BDO. In addition, for large The demand for large-scale production of PBAT, the production capacity of the tank-type esterification tank is limited by the agitator and the heat exchange area, the production capacity of a single tank-type esterification tank is limited, and the only way to increase the number of stirred-type esterification tanks is to cause the production The investment cost of PBAT is higher

Method used

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  • Esterification device and method for AA and BDO in PBAT production process

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Embodiment 1

[0042] see figure 1 , is a specific embodiment of the esterification device of AA and BDO in the production process of PBAT. The esterification device of AA and BDO in the production process of PBAT includes a reactor 1, a silo 2, and a vacuum flash tank 3. The silo 2 is formed as a whole by connecting the upper cylindrical section and the lower inverted conical section. The silo is also provided with a coil for heating and keeping warm the AA and BDO in the silo. There is an agitator in the silo. , the feed port of silo 2 is used to connect with AA source and BDO source, wherein AA (adipic acid) is usually a powder, and BDO (1,4-butanediol) is usually an oily liquid. The discharge port of the silo 2 is connected to the material channel inlet of the reactor 1 through the feed pump 4 and the heater 5. Usually, the feed pump adopts a jacketed gear pump, and the heater uses high-temperature heat transfer oil as the heat medium. The outlet of the material channel of the reactor ...

Embodiment 2

[0043] Embodiment 2 produces 300,000 tons / year PBAT

[0044] Adopt the method for the synthetic BSA of the esterification unit of embodiment 1, may further comprise the steps:

[0045] 1) Add BDO (60°C, oily liquid) and AA (30°C, powder) into the silo, stir and mix well, so that the powder AA and the liquid phase BDO are fully mixed to obtain AA / BDO solid-liquid slurry, and control The temperature of the solid-liquid slurry is 40-60°C;

[0046] 2) The AA / BDO solid-liquid slurry is pumped out by the feed pump, and the temperature is raised to 180°C by the heater to obtain the AA / BDO homogeneous slurry, and the catalyst (tetrabutyl titanate, the addition amount is 0.1-0.5kg / t PBAT)

[0047] Enter the material channel of the reactor through the micro-interface generator to carry out esterification reaction. The esterification temperature is 200°C. The time for AA / BDO homogeneous slurry in the material channel is 1h, and BSA and esterification water are discharged from the outl...

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Abstract

An esterification device for AA and BDO in the PBAT production process comprises a micro-interface wound tube type reactor, a stock bin and a vacuum flash tank. A feeding port of the stock bin is used for being connected with an AA source and a BDO source, a discharging port of the stock bin is connected with a material channel inlet of the reactor through a feeding pump and a heater, and a material channel outlet of the reactor is connected with the vacuum flash tank. A micro-interface generator is arranged at an inlet of the material channel, a liquid outlet in the bottom of the vacuum flash tank is used for discharging BSA, a steam outlet in the top of the vacuum 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 of large-scale production of PBAT can be met at low cost, the esterification reaction can be carried out in the forward direction without adopting an excessive BDO mode, the esterification rate of AA and BDO can be effectively improved and reaches 98.5% or above, material backmixing can be effectively avoided, the circulation amount of BDO is reduced by 95%, and energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to an esterification device and method for AA and BDO 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] On January 16, 2020, the National Development and Reform Commission and the Ministry of Ecology and Environment issued the "Opinions on Further Strengthening the Treatment of Plastic Pollution", requiring that in 2025, the management system for the production, circulation, consumption, recycling and disposal of plastic products should be improved, and non-degradable Plastics are gradually...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/00B01D3/06B01D3/10B01J19/00B01J19/24C08G63/78C08G63/79C08G63/16C08G63/85
CPCB01D3/009B01D3/06B01D3/10B01J19/0013B01J19/2415C08G63/785C08G63/79C08G63/16C08G63/85
Inventor 姜国新孟启贵陈发挥刘丹青张剑
Owner 华峰集团上海工程有限公司
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