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Composite catalyst for dehydration condensation reaction and preparation method thereof

A composite catalyst, dehydration condensation technology, applied in the preparation of organic compounds, organic compounds/hydrides/coordination complex catalysts, dehydration of hydroxyl-containing compounds to prepare ethers, etc. Low problems, to achieve the effect of improving the reaction rate, shortening the reaction time, and simplifying the refining process

Inactive Publication Date: 2014-08-20
TIANJIN CLEANTECH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of existing dehydration condensation catalysts such as single function, low reaction conversion rate and long reaction time, the present invention develops a catalyst with catalytic and Composite catalyst with dual functions of dehydration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of a composite catalyst for the synthesis of ethyl acetate: slowly add polyacrylic acid-acrylamide to acetone containing p-chlorotoluenesulfonic acid while stirring, the mass ratio of p-chlorotoluenesulfonic acid to polyacrylic acid-acrylamide 40:1, stirred and reacted at 35°C for 10 hours, filtered and dried after the reaction, and the composite catalyst polyacrylic acid-acrylamide-p-chlorotoluenesulfonic acid was obtained.

[0022] Synthesis of ethyl acetate: Add 30g of acetic acid, 23g of ethanol and 5.1g of composite catalyst (polyacrylic acid-acrylamide-p-chlorotoluenesulfonic acid) into the reactor, stir and react at 80°C for 1.0 hour, filter after the reaction The composite catalyst was produced, and the composition of the filtrate was analyzed by gas chromatography, and the conversion rate of acetic acid was calculated to be 99.7%, and the selectivity coefficient of ethyl acetate was 99.9%. Immerse the filtered composite catalyst in 25% sodium chlori...

Embodiment 2

[0024] Preparation of a composite catalyst for the synthesis of isopropyl acetate: polyacrylic acid-acrylamide is slowly added to acetone containing p-chlorotoluenesulfonic acid while stirring, the quality of p-chlorotoluenesulfonic acid and polyacrylic acid-acrylamide The ratio is 50:1, stirred and reacted at 50°C for 5 hours, filtered and dried after the reaction, and the composite catalyst polyacrylic acid-acrylamide-p-chlorotoluenesulfonic acid is obtained.

[0025] Synthesis of isopropyl acetate: Add 30g of acetic acid, 60g of isopropanol and 9g of composite catalyst (polyacrylic acid-acrylamide-p-chlorotoluenesulfonic acid) into the reactor, stir and react at 85°C for 2.0 hours, filter after the reaction The composite catalyst was produced, and the composition of the filtrate was analyzed by gas chromatography, and the conversion rate of acetic acid was calculated to be 99.8%, and the selectivity coefficient of isopropyl acetate was 99.9%. Immerse the filtered composite ...

Embodiment 3

[0027] Preparation of a composite catalyst for the synthesis of ether: slowly add commercially available polyacrylonitrile to ethanol containing trifluoromethyl phosphoric acid while stirring, the mass ratio of trifluoromethyl phosphoric acid to polyacrylonitrile is 35:1 , stirred and reacted at 50° C. for 8 hours, and filtered and dried after the reaction to obtain the composite catalyst polyacrylonitrile-trifluoromethylphosphoric acid.

[0028] Synthesis of ether: Add 60g of ethanol and 4.1g of composite catalyst (polyacrylonitrile-trifluoromethylphosphoric acid) into the reactor, stir and react at 100°C for 1.0 hour, filter out the composite catalyst after the reaction, and use gas chromatography The composition of the filtrate was analyzed, and the conversion rate of ethanol was calculated to be 99.6%, and the selectivity coefficient of ether was 99.5%. Immerse the filtered composite catalyst in 35% sodium chloride solution for 50 minutes, filter and dry, and complete the ...

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Abstract

The invention discloses a composite catalyst for a dehydration condensation reaction and a preparation method thereof. The composite catalyst has two effects of high catalysis performance and water absorption, and is made from a catalyst and super absorbent resin which participate in the dehydration condensation reaction through a chemical bonding function. The composite catalyst is used for the dehydration condensation reaction and is capable of immediately removing water generated by reaction to ensure that the conversion rate of a reactant and the selectivity coefficient of a target project is close to 100 percent; the reaction time is remarkably shortened, the composite catalyst can be repeatedly used by only simple regeneration processing, and high catalytic performance and water absorption capability can be kept. The composite catalyst disclosed by the invention can be used for dehydration condensation reactions such as esterification, etherification and acylation.

Description

technical field [0001] The invention relates to a composite catalyst for dehydration condensation reaction and a preparation method thereof, belonging to the technical field of chemical synthesis. Background technique [0002] Dehydration condensation reaction refers to the reaction in which two or more organic molecules interact under catalyst conditions to form a macromolecule by covalent bonding, while losing water, such as the reaction of acid and alcohol to form ester (also called esterification reaction), Amines and acids react to form amides (also known as acylation reactions), which all belong to dehydration condensation reactions. It can be said that dehydration condensation reactions are one of the most common reaction types in the field of chemical synthesis. , aerospace and other important products or intermediates. However, the dehydration condensation reaction is a typical reversible reaction, and the generated target product will be decomposed into reactants ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C07B61/00C07C67/08C07C69/14C07C41/09C07C43/06C07C51/56C07C53/12C07C231/02C07C233/05
Inventor 张学岗张静
Owner TIANJIN CLEANTECH TECH
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