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Production method for continuous bubble tower absorption of polysorbate

A production method and sorbic acid technology, applied in the production field of sorbic acid polyester continuous bubbling tower absorption

Active Publication Date: 2013-12-18
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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  • Production method for continuous bubble tower absorption of polysorbate
  • Production method for continuous bubble tower absorption of polysorbate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Schematic diagram of the reaction device for sorbic acid polyester continuous bubble column absorption as attached figure 1 shown.

[0059] Venturi jet pump 7 has a lift of 30m and a flow rate of 100m 3 / h, pumping capacity 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 lift of the first circulation pump 3 is 30m; the lift of the second circulation pump 6 is 30m .

[0060] Content is that the material that 99% crotonaldehyde and polymerization catalyst mixes is sprayed in the tower by the top of spray absorption tower 5, and when the amount of liquid in the tower still is sufficient for system circulation, start the second circulation pump 6 outside the tower still. The crotonaldehyde material is circulated, and a part of the circulating material is sprayed into the top of the spray absorption tower 5, and returns...

Embodiment 2

[0063] Schematic diagram of the reaction device for sorbic acid polyester continuous bubble column absorption as attached figure 1 shown.

[0064] Venturi jet pump 7 has a lift of 35m and a flow rate of 150m 3 / h, pumping capacity 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 lift of the first circulation pump 3 is 50m; the lift of the second circulation pump 6 is 50m .

[0065] With reference to the operation of Example 1, 99% crotonaldehyde is changed into 60% crotonaldehyde solution taking toluene as solvent, and the reaction conversion rate of control crotonaldehyde is 80%, and the sorbic acid polyester solution obtained is equally pressed The depolymerization post-processing method operation of embodiment 1 obtains 815g of white finished product sorbic acid, and content is greater than 99.5%, and the depolymerizati...

Embodiment 3

[0067] Schematic diagram of the reaction device for sorbic acid polyester continuous bubble column absorption as attached figure 1 shown.

[0068] Venturi jet pump 7 has a lift of 40m and a flow rate of 250m 3 / h, pumping capacity 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 lift of the first circulation pump 3 is 60m; the lift of the second circulation pump 6 is 50m .

[0069] With reference to the operation of Example 1, 99% crotonaldehyde is changed into 80% crotonaldehyde solution taking toluene as solvent, and the reaction conversion rate of control crotonaldehyde is 60%, and the sorbic acid polyester solution obtained is equally pressed The depolymerization post-processing method operation of embodiment 1 obtains 823g of white finished product sorbic acid, and content is greater than 99.5%, and the depolymerizati...

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Abstract

The invention provides a production method for continuous bubble tower absorption of polysorbate. The production method is characterized in that butenal and a polymerization catalyst are sprayed and are continuously fed from the top of a secondary spray absorption tower (5), and the butenal and the polymerization catalyst, together with unreacted ketene tail gas released from the top of a bubble packed tower (2), are absorbed to the secondary spray absorption tower (5) through negative pressure formed by a Venturi jet pump (7) for a circulating absorption reaction, are fed to the bottom of the bubble packed tower (2) through a first circulating pump (3), and participate in a ketene and butenal polymerization reaction focusing on downstream negative pressure absorption together with ketene from the bottom of the bubble packed tower (2) under normal pressure; a qualified polyester solution is continuously extracted from the top of the bubble tower. The method can 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 the polymerization efficiency and the polyester quality, and reduce the production cost; the method has good reaction prospect.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a production method for sorbic acid polyester continuous bubble tower absorption. [0002] Background technique [0003] Sorbic acid (sorbic acid), the chemical name is 2,4-hexadienoic acid, is a kind of unsaturated fatty acid with conjugated diene, it can effectively inhibit the activity of mold, yeast and aerobic bacteria, and it can inhibit the activity of harmful microorganisms The effect of growth and reproduction is stronger than the bactericidal effect, and it is a preservative recommended by the Food Organization of the United Nations to countries all over the world. Sorbic acid has been widely used in antisepsis and preservation in various industries such as food, vegetables, fruits, medicine, rubber, paper, animal feed, cosmetics, paint, tobacco, and beverages. [0004] At present, the main preparation route of sorbic acid is to polymerize crotonaldehyde an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00B01J4/00B01J3/02C08G63/08C08G63/78
Inventor 丁彩峰朱小刚刘芳姚俊生
Owner NANTONG ACETIC ACID CHEM
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