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Method for preparing refined acrylic acid by removing micro-impurity aldehyde

A technology for trace impurities, acrylic acid, applied in the separation/purification of carboxylic acid compounds, organic chemistry and other directions, can solve the problems of high cost of acrylic acid dealdehyde treatment, expensive alkyl mercaptan, incomplete dealdehyde removal, etc., and reduce production costs. , the effect of less agent and less dosage

Active Publication Date: 2010-05-19
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method does not generate deposits, alkyl mercaptans are more expensive, and with more expensive resin catalysts, the cost of acrylic acid dealdehyde treatment is higher
In addition, the resin catalyst needs to be replaced regularly, and the operation is more cumbersome
German patent GB02285046A, Japanese patents JP11060536 and JP10087552 all use phenylhydrazine and organic ammonia as dealdehyde agents for crude acrylic acid, and both have incomplete dealdehyde and deposits at the bottom of the reaction kettle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0021] Add 300 grams of thick acrylic acid containing 120ppm furfural, 20ppm acrolein and 150ppm benzaldehyde in a three-necked flask of 500ml, then add 1000ppm polymerization inhibitor hydroquinone and 0.5% (mass) alcohol dealdehyde agent, at 50 ℃ Reaction at high temperature for 40min. Then on the 500ml there-necked flask, connect the distillation packing column equivalent to 10 theoretical plates and carry out rectification under reduced pressure to obtain the product refined acrylic acid. The experimental results are shown in Table 1.

[0022] Table 1 Experimental results of dealdehydeization of crude acrylic acid by a single alcohol

[0023] Example

Embodiment 5-8

[0025] Except that the dealdehyde agent is changed from a single alcohol to a mixed alcohol, the raw material composition, reaction and rectification conditions are all the same as in Example 1, and the results are shown in Table 2.

[0026] Table 2 Mixed alcohol (ratio is 1: 1) to the dealdehyde experimental result of crude acrylic acid

[0027] Example

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PUM

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Abstract

The invention relates to a method for preparing high- purity acroleic acid. It comprises following steps: (1) water absorbing and fine distilling propone oxidate, and getting coarse acroleic acid containing foreign aldehyde of 10- 1000 ppm, said foreign aldehyde includes acrolein, acrolein and benzaldehyde; (2) adding inhibitor eldopaque and alcohol matter containing 3- 10 carbons into coarse acroleic acid, the alcohol matter and foreign aldehyde reacts at normal pressure and 25- 100 Deg. C for 0.1- 10 hours; (3) intermitten or continuous rectification material under vacuum of 0.1- 50 Kpa, getting high- purity acroleic acid with aldehyde content being zero and acroleic acid content being more than 99.8%. The invention is characterized by simple reaction, easy separation of foreigh materialfrom product, low production cost and high- purity of product.

Description

technical field [0001] The invention relates to a method for preparing high-purity acrylic acid by removing a small amount of impurity aldehyde, in particular to the raw material of crude acrylic acid containing impurity aldehyde obtained by catalytic oxidation of propylene, and chemically A method for preparing high-purity acrylic acid from dealdehyde. Background technique [0002] During the catalytic oxidation of propylene, a variety of by-products such as furfural and other aldehydes are produced, and these by-products are more or less brought into acrylic acid products, resulting in a decrease in the purity of acrylic acid products, thereby affecting the performance of acrylic acid products, especially When the user needs high-purity polymer grade refined acrylic acid, it often cannot meet the user's requirements because it contains aldehyde impurities. [0003] Because the physical properties of aldehydes such as furfural are similar to acrylic acid, the small amount ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C57/075C07C51/42
Inventor 刘书举马建学张庆怀舒月峰邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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