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Application of calcium sulfate whisker as catalyst for ester synthesis

A technology of calcium sulfate whiskers and catalysts, which is applied in the direction of physical/chemical process catalysts, preparation of carboxylic acid esters, preparation of organic compounds, etc., can solve problems such as environmental pollution, achieve good product color, save equipment investment and energy consumption, The effect of less side effects

Inactive Publication Date: 2010-05-12
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Judging from the current situation, the ubiquitous problem is environmental pollution, so it is urgent to find a high-efficiency catalyst that does not increase production costs and does not have the "three wastes" problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 31g of acetic acid, 37g of n-butanol in a three-necked flask equipped with a thermometer, reflux condenser, water separator and stirrer, then add 1.36g of calcium sulfate whiskers and water-carrying agent (cyclohexane), stir, and heat After reaching 80°C, react for several hours until the volume of water in the water separator no longer increases. After the reaction is over, wait for the reaction system to cool down, filter out the calcium sulfate whiskers, wash and dry the filtrate, and then distill it. The fractions at 124° C. to 126° C. were collected and analyzed by a gas chromatograph. The yield of the product was 98.15%, and the target product was n-butyl acetate.

Embodiment 2

[0030] Add 31g acetic acid, 37g n-butanol in the three-necked flask that thermometer, reflux condenser, water separator and stirrer are housed, then add the calcium sulfate whisker and water-carrying agent (hexanaphthene) that reclaim among the embodiment 1 , stir, heat to 80°C and react for several hours until the volume of water in the water separator no longer increases, stop heating, after the reaction is over, wait for the reaction system to cool down, filter out calcium sulfate whiskers, wash and dry the filtrate After distillation, the fractions at 124° C. to 126° C. were collected and analyzed by a gas chromatograph. The yield of the product was 97.93%, and the target product was n-butyl acetate.

Embodiment 3

[0032] Add 31g acetic acid, 37g n-butanol in the three-necked flask that thermometer, reflux condenser, water separator and agitator are equipped with, then add the calcium sulfate whisker and water-carrying agent (hexanaphthene) that reclaim in embodiment 2 , stir, heat to 80°C and react for several hours until the volume of water in the water separator no longer increases, stop heating, after the reaction is over, wait for the reaction system to cool down, filter out calcium sulfate whiskers, wash and dry the filtrate After distillation, the fractions at 124° C. to 126° C. were collected and analyzed by a gas chromatograph. The yield of the product was 96.48%, and the target product was n-butyl acetate.

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Abstract

The invention belongs to the field of chemistry and chemical industry and in particular relates to application of a calcium sulfate whisker as a catalyst for ester synthesis, which is characterized by adopting the calcium sulfate whisker as the catalyst for ester synthesis reaction. The amount of the calcium sulfate whisker accounts for 1-6% of the total amount of the raw material for ester synthesis reaction. The target product from ester synthesis reaction is ethyl acetate or n-butyl acetate. The calcium sulfate whisker is a fibrous monocrystal of calcium sulfate dihydrate, calcium sulfate hemihydrate or anhydrous calcium sulfate. The ester synthesis reaction is carried out as follows: a. adding metered acid and alcohol into a three-neck flask with a thermometer, a reflux condensation tube, a water separator and an agitator; b. then adding the calcium sulfate whisker and a water-carrying agent into the three-neck flask in the step a to be agitated and heated; and c. after the reaction is finished and the reaction system is cooled, filtering out the calcium sulfate whisker, and washing, drying and then distilling filtrate, thus obtaining the ester target product. The calcium sulfate whisker has low cost, good environmental protection efficacy and simple process and is easy to separate, and the catalyst is convenient to recover.

Description

technical field [0001] The invention belongs to the field of chemistry and chemical engineering, and more specifically relates to the application of a calcium sulfate whisker as an ester synthesis catalyst. Background technique [0002] There are many types of catalysts for ester synthesis. Sulfuric acid or p-toluenesulfonic acid is usually used as a catalyst in the process of ester synthesis. Sulfuric acid catalyzed esterification is a classic method for ester synthesis. This traditional chemical process is very effective and mature. However, since the concept of green chemistry was introduced into our country in the late 1990s, the traditional chemical process has encountered serious challenges required by the sustainable development of human society. Research on new catalysts has become an inevitable trend. Because sulfuric acid can cause side reactions such as carbonization, oxidation, etherification, and sulfonation of organic matter when heated, and it is highly corro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053C07C67/08C07C69/14C07C69/704
Inventor 张连红梁红玉张洪林蒋林时
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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