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Continuous preparation method of sorbic acid

A sorbic acid, continuous technology, applied in the field of continuous sorbic acid preparation, can solve the problems of potential safety hazards, low equipment utilization rate, cumbersome process operation and the like

Active Publication Date: 2020-07-07
NANTONG ACETIC ACID CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this process are: each section adopts a conventional intermittent production process, crotonaldehyde is easy to polymerize with ketene itself, there are many side reactions, the process operation is cumbersome, the utilization rate of equipment is not high, and it is difficult to stop the reaction in time after the abnormality of the conventional reactor reaction There are security risks

Method used

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  • Continuous preparation method of sorbic acid

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Embodiment approach

[0037] Further embodiments of the present invention are as follows:

[0038] (1) Continuous preparation of raw materials: crotonaldehyde and solvent are continuously mixed in the pipeline at a mass ratio of 0.3 to 10:1, and then the catalyst is continuously injected into crotonaldehyde and solvent at a ratio of 0.1% to 5% of the total mass of crotonaldehyde and solvent. The crotonaldehyde solution is prepared in the solvent mixture.

[0039](2) Continuous condensation: The vinyl ketone and crotonaldehyde solution prepared by cracking acetic acid are poured into the condensation reactor with a molar ratio of 1:1 to 5 to carry out continuous condensation reaction, and at the same time, the condensed liquid after reaction is exported with equal feed quality (reaction The pressure is 0-0.1MPa, the reaction temperature is 30-80°C, and the residence time of the reaction is 1s-4h.)

[0040] (3) Continuous removal of solvent: the condensed liquid after the reaction enters the continu...

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Abstract

The invention belongs to the field of chemical production, and provides a continuous preparation method of sorbic acid; the preparation process relates to five processes of continuous condensation, continuous solvent removal, continuous hydrolysis, continuous washing and continuous crystallization, and all processes from reaction to aftertreatment are continuous processes. The method has the advantages that (1) the reaction retention time is greatly shortened, polymerization of crotonaldehyde or ketene can be inhibited, side reactions are reduced, and the product yield and quality are improved; and (2) the continuous preparation process can cut off feeding in time, so that the harm caused by abnormal reaction is reduced, and the safety coefficient is higher. And (3) continuous integrationof the preparation process is realized, the product production time is shortened, the productivity is increased, the equipment utilization rate is increased, the whole process is simple and easy to operate, and clean production is further realized by recycling the activated carbon.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a continuous preparation method of sorbic acid. Background technique [0002] Sorbic acid, also known as: 2,4-hexadienoic acid, appearance and properties: white needle-like or powdery crystals. Solubility: Slightly soluble in water, soluble in many organic solvents. Molecular weight: 112.13, melting point: 132-135°C, boiling point: 228°C (decomposition), density: 1.204 (19°C), flash point: 127°C, [0003] Function and use: This product is an unsaturated fatty acid with conjugated diene, which can effectively inhibit the activity of mold, yeast and aerobic bacteria, and its inhibitory effect on the development and reproduction of harmful microorganisms is stronger than the bactericidal effect , is a preservative recommended by the Food Organization of the United Nations to countries all over the world, and its safety is twice that of table salt. Sorbic acid has been...

Claims

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Application Information

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IPC IPC(8): C07C51/09C07C51/42C07C51/43C07C51/47C07C51/48C07C57/10C08G63/00
CPCC07C51/09C07C51/42C07C51/43C07C51/47C07C51/48C08G63/005C07C57/10Y02P20/584
Inventor 庆九俞新南朱小刚刘芳
Owner NANTONG ACETIC ACID CHEM
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