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Esterification catalyst and method for synthesizing ester using the catalyst

A technology of esterification reaction and catalyst, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, etc., to achieve the effect of reducing color, less reaction side reactions, and reducing corrosion

Inactive Publication Date: 2008-10-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems existing in existing catalysts, the purpose of this invention is to provide a kind of esterification reaction catalyst and the method utilizing this catalyst to synthesize esters

Method used

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  • Esterification catalyst and method for synthesizing ester using the catalyst
  • Esterification catalyst and method for synthesizing ester using the catalyst
  • Esterification catalyst and method for synthesizing ester using the catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The reaction between oleic acid and methanol is catalyzed by the catalyst prepared by mixing DMF and concentrated sulfuric acid.

[0031] A. After mixing DMF and concentrated sulfuric acid at a mol ratio of 1:1, take 0.95g of the mixture and add it to a four-necked flask filled with 48ml of methanol, then add 63ml of oleic acid, stir and reflux for 3h, the reflux temperature is 70 degrees Celsius, oil Acid conversion reached 97%. The acid value of the product is 5.9, and the color of the product methyl oleate is very light.

[0032] B, after mixing DMF and concentrated sulfuric acid at a mol ratio of 2:1, take 1.35g of the mixture and add it to a four-necked flask equipped with 48ml of methanol, then add 63ml of oleic acid, stir and reflux for 3h, the reflux temperature is 70 degrees Celsius, oil The acid conversion reached 96.3%. The acid value of the product is 7.3, and the color of the product methyl oleate is very light.

Embodiment 2

[0034] The reaction between oleic acid and methanol is catalyzed by a catalyst prepared by mixing urea and concentrated sulfuric acid.

[0035] After mixing urea and concentrated sulfuric acid at a molar ratio of 1:1.2, take 0.77g of the mixture and add it to a four-neck flask filled with 48ml of methanol, then add 63ml of oleic acid, stir and reflux for 3 hours, the reflux temperature is 70 degrees Celsius, the oleic acid The conversion rate reached 97.2%. , the acid value of the product is 5.6.

Embodiment 3

[0037] The corrosion of stainless steel in the reaction of oleic acid and methanol is catalyzed by a catalyst prepared by mixing DMF and sulfuric acid.

[0038] After mixing DMF and concentrated sulfuric acid at a mol ratio of 1:1, take 0.95g of the mixture and add it to a flask filled with 20ml of methanol, then add 63ml of oleic acid, and put a 4.5mm×1.8mm in size and a thickness of 1mm in it. 304 type stainless steel sheet, after reflowing at 80 degrees Celsius for 5 hours, the surface of the stainless steel sheet has no corrosion (corrosion degree <0.004%). When concentrated sulfuric acid is used as a catalyst under the same conditions, the corrosion degree of stainless steel sheet is 0.64%.

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Abstract

The present invention discloses an acidic esterification catalyst which can reduce corrosion and a method for utilizing the catalyst to synthesize ester. The catalyst is formed by mixing acid amide and oil of vitriol according to a certain proportion. The method of utilizing the catalyst to synthesize ester includes: firstly adding a fixed amount of ester into a reactor, then adding the catalyst into the ester and dissolving, finally adding the acid according to a proper proportion and separating after heating and stirring reaction, thus obtaining the required ester. The catalyst provided by the present invention is easy to obtain with high catalyzing efficiency, which greatly reduces the occurrence of the secondary reactions and the color of the product and simultaneously decreases the corrosion to reacting equipment caused by a reaction system.

Description

technical field [0001] The invention relates to a catalyst, in particular to an esterification reaction catalyst in the chemical industry and a method for synthesizing esters using the catalyst. Background technique [0002] Low molecular weight esters can be used as solvents, and higher molecular weight esters are good plasticizers. Methyl methacrylate is a monomer used to make plexiglass (polymethyl methacrylate). Polyester resin is mainly used in fiber and paint industries, and can also be made into compression molding powder. Esters of many branched alcohols are excellent lubricating oils. Esters can also be used in industries such as fragrances, essences, cosmetics, soaps and pharmaceuticals. [0003] At present, when producing esters in industry, sulfuric acid is mainly used as a catalyst for the reaction. Sulfuric acid has the following disadvantages as a catalyst for the esterification reaction: 1. Side reactions such as oxidation and sulfonation are prone to occu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J31/04B01J27/02C07C67/08
Inventor 顾全荣章留留李雪白禹邹海王渊涛
Owner NANJING UNIV
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