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Reaction device for continuous bubble tower absorption of polysorbate

A technology of reaction device and bubble tower, which is applied in the field of reaction device for sorbic acid polyester continuous bubble tower absorption, and can solve problems such as poor effect

Active Publication Date: 2014-12-10
NANTONG ACETIC ACID CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The continuous reaction form introduced in the Chinese Patent Publication Application No. 200810098512 is that a part of the material in the tower kettle is continuously extracted, and most of it is used as a circulating material to carry out pressurized circulation to absorb ketene, that is, crotonaldehyde in the material used to absorb ketene The concentration of ketene has dropped significantly, which is more conducive to the self-polymerization of ketene and other side reactions. If the method of adding solvent is used to produce polyester, the effect will be even worse. Therefore, the method of continuously producing polyester in series with circulating spray packed towers is also Not the most ideal form of response

Method used

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  • Reaction device for continuous bubble tower absorption of polysorbate
  • Reaction device for continuous bubble tower absorption of polysorbate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The schematic diagram of the reaction device for the absorption of the sorbic acid polyester continuous bubble tower is attached figure 1 Shown.

[0059] Venturi jet pump 7 has a head of 30m and a flow rate of 100m 3 / h, pumping volume 150m 3 / h; the tower height of the secondary spray absorption tower 5 is 6m, and the tower diameter is 450mm; the tower height of the bubbling packed tower 2 is 3m, and the tower diameter is 400mm; the head of the first circulating pump 3 is 30m; the head of the second circulating pump 6 is 30m .

[0060] The mixed material with a content of 99% crotonaldehyde and polymerization catalyst is sprayed from the top of the spray absorption tower 5 into the tower. When the amount of liquid in the tower kettle is sufficient for the system to circulate, the second circulating pump 6 outside the tower kettle is started. The crotonaldehyde material is circulated. A part of the circulating material is sprayed from the top of the spray absorption tower 5...

Embodiment 2

[0063] The schematic diagram of the reaction device for the absorption of the sorbic acid polyester continuous bubble tower is as attached figure 1 Shown.

[0064] Venturi jet pump 7 has a head of 35m and a flow rate of 150m 3 / h, suction volume 180m 3 / h; the tower height of the secondary spray absorption tower 5 is 7m, and the tower diameter is 550mm; the tower height of the bubbling packed tower 2 is 4m, and the tower diameter is 500mm; the head of the first circulating pump 3 is 50m; the head of the second circulating pump 6 is 50m .

[0065] Refer to the operation in Example 1, change 99% crotonaldehyde to 60% crotonaldehyde solution with toluene as solvent, and control the reaction conversion rate of crotonaldehyde to 80%, and the obtained sorbic acid polyester solution is also The post-depolymerization treatment method of Example 1 was operated to obtain 815 g of white finished sorbic acid, with a content greater than 99.5%, and the depolymerization yield of the sorbic acid...

Embodiment 3

[0067] The schematic diagram of the reaction device for the absorption of the sorbic acid polyester continuous bubble column is attached figure 1 Shown.

[0068] Venturi jet pump 7 has a head of 40m and a flow rate of 250m 3 / h, suction volume 260m 3 / h; the tower height of the secondary spray absorption tower 5 is 10m, and the tower diameter is 650mm; the tower height of the bubbling packed tower 2 is 7m, and the tower diameter is 600mm; the head of the first circulating pump 3 is 60m; the head of the second circulating pump 6 is 50m .

[0069] Refer to the operation of Example 1, change 99% crotonaldehyde to 80% crotonaldehyde solution with toluene as solvent, and control the reaction conversion rate of crotonaldehyde to 60%. The obtained sorbic acid polyester solution is also The post-depolymerization treatment method of Example 1 was operated to obtain 823 g of white finished sorbic acid with a content of more than 99.5%, and the depolymerization yield of the sorbic acid polye...

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Abstract

The invention provides a reaction device for continuous bubble tower absorption of polysorbate. The device comprises a polyester groove (1) for receiving qualified polysorbate, a bubble packed tower (2) for a downstream absorption reaction, and a first circulating pump (3) which is connected to the bottom of the bubble packed tower (2); the reaction device is characterized by further comprising a secondary spray absorbing packed tower combination device (4) for keeping the bubble packed tower (2) under negative pressure. Through the reaction device, a polymerization reaction between butenal and ketene is continuously performed and finished in the downstream bubble packed tower (2) under micro-negative pressure, to realize continuous reaction between high-concentration butenal and high-concentration ketene within relatively short time, so as to avoid generation of more tar, guarantee safe and stable production, improve polymerization efficiency, polyester quality and polyester hydrolysis yield, and reduce production cost; the reaction device has good reaction prospect.

Description

Technical field [0001] The invention belongs to the field of chemical industry, and specifically relates to a reaction device for sorbic acid polyester continuous bubble tower absorption. Background technique [0002] Sorbic acid (sorbic acid), whose chemical name is 2,4-hexadienoic acid, is an unsaturated fatty acid with conjugated diene. It can effectively inhibit the activity of molds, yeasts and aerobic bacteria, and inhibit harmful microorganisms. The role of growth and reproduction is stronger than that of sterilization, and it is the preservative recommended by the United Nations Food Organization to countries around the world. Sorbic acid has been widely used in various food, vegetables, fruits, medicine, rubber, papermaking, animal feed, cosmetics, paint, tobacco, beverages and other industries for preservative and preservation. [0003] At present, the main preparation route adopted by sorbic acid is the polymerization of crotonaldehyde and ketene to form polyester, whic...

Claims

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Application Information

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IPC IPC(8): B01J19/00B01J10/00B01D53/14C08G63/08C08G63/78C07C57/10C07C51/09
Inventor 丁彩峰朱小刚刘芳姚俊生
Owner NANTONG ACETIC ACID CHEM
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