Hydrolysis method of esters

A kind of ester, said technology, applied in the field of ester hydrolysis, can solve the problems of high price, high cost of industrial use, loss of activity, etc., and achieve the effect of cheap price, low cost and easy separation

Inactive Publication Date: 2004-11-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this catalyst is: when the temperature is higher than 56.9°C, the catalyst will swell in the reaction system and lose its activity
The disadvantage of this catalyst is that it is expensive and the cost of industrial use is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 20g of phosphotungstic acid dried at 100°C and dissolve it in 80g of pure water to make solution A; weigh 0.67g of ammonium carbonate and dissolve it in 6g of water to make solution B; B. Stir fully; continue stirring for 40 minutes after the dropwise addition is completed; dry at 80°C to obtain the following catalyst: NH 4 h 2 PW 12 o 40 .

[0025] 10.00 g of the catalyst, 67.25 g of methyl acetate, and 32.75 g of water were charged into a 250 ml batch reactor, and the temperature was raised to 100° C. to hydrolyze the methyl acetate for 90 minutes. When the reaction product was collected and analyzed, the conversion rate of methyl acetate was 47.8%.

Embodiment 2

[0027] Weigh 5g of phosphotungstic acid dried at 100°C and dissolve it in 20g of water to make solution A; weigh 0.10g of ethylenediamine and dissolve it in 2g of methanol to make solution B; add the solution to solution A dropwise B. Stir fully; continue stirring for 40 minutes after the dropwise addition is completed; dry at 80°C to obtain the following catalyst: NH 4 CH 2 CH 2 NHH 2 PW 12 o 40 .

[0028] 10.00 g of the catalyst, 74.00 g of methyl butyrate, and 26.10 g of water were charged into a 250 ml three-necked bottle. The temperature was raised to 80° C. to hydrolyze methyl butyrate, and the reaction was carried out for 150 minutes. When the reaction product was collected and analyzed, the conversion rate of methyl butyrate was 24.4%.

Embodiment 3

[0030] Weigh 20g of silicotungstic acid dried at 100°C and dissolve it in 80g of pure water to make solution A; weigh 0.56g of ammonium nitrate and dissolve it in 5g of water to make solution B; add solution to solution A B, fully stir; continue to stir for 40 minutes after the dropwise addition is completed; add an appropriate amount of silicon dioxide fine powder to the mixture, and continue to stir vigorously for 60 minutes; dry and calcinate to obtain the following catalyst: NH 4 h 3 SiW 12 o 40 / SiO 2 .

[0031] 10.00 g of the catalyst, 81.00 g of ethyl benzoate, and 19.30 g of water were charged into a 250 ml batch reactor. The temperature was raised to 100° C., and ethyl benzoate was hydrolyzed for 120 minutes. When the reaction product was collected and analyzed, the conversion rate of ethyl benzoate was 44.8%.

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PUM

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Abstract

The ester hydrolyzing method includes hydrolyzing ester in water to produce C1-C10 fatty acid or aromatic acid and C1-C4 fatty alcohol under the presence of ammonium salt of heteropoly acid as catalyst. The ammonium salt of heteropoly acid is obtained through the reaction between heteropoly acid in Keggin structure and inorganic ammonium salt or organic amine, the heteropoly acid is selected from phosphotungstic acid, silicotungstic acid, silicomolybdic acid and phosphomolybdic acid; the inorganic ammonium salt is selected from ammonium carbonate, ammonium nitrate, ammonium sulfate, ammonium phosphate and diammonium hydrochloride; and the organic amine is selected from fatty amine, alicyclic amine and arylamine. The said ester hydrolyzing method can obtain high conversion rate in relatively lower water/ester ratio and relatively short time, and the catalyst is cheap and easy to separate from the product.

Description

technical field [0001] The present invention relates to a method for the hydrolysis of esters and a catalyst for use. technical background [0002] The hydrolysis of ester compounds is an important class of reactions widely used in various sectors of the national economy. For example, the hydrolysis of methyl acetate is an important step in the recovery and recycling of acetic acid and methanol in the polyvinyl alcohol industry. A large amount of by-products of methyl acetate are produced every year in industry, which need to be hydrolyzed into acetic acid and methanol for recycling to reduce costs. Existing methyl acetate hydrolysis catalysts include resins, heteropolyacids and cesium salts of heteropolyacids. [0003] Strongly acidic cation exchange resins are currently industrially used methyl acetate hydrolysis catalysts. The catalyst has the advantages that the catalyst is a solid insoluble in the reaction system, the catalyst and the product are easily separated aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/02
Inventor 陈海波吴巍叶岗俞芳时昭喻惠利
Owner CHINA PETROLEUM & CHEM CORP
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