Solid acid catalyst and preparation method and application thereof in esterification transesterification

A solid acid catalyst, a technology for transesterification, which is used in catalyst activation/preparation, fatty acid esterification, chemical instruments and methods, etc., and can solve the problems of difficult recovery and regeneration, environmental pollution, and insufficient activity.

Active Publication Date: 2020-07-07
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at defects such as difficult recovery and regeneration, insufficient activity and environmental pollution in the process of the current solid acid catalyst used in the esterification and transesterification of kitchen waste oil, the first purpose of the present invention is to provide a catalyst with a large specific surface area and high activity. A solid acid catalyst with many sites and two acid active centers, Lewis and Bronsted, which is not easy to lose and has more stable catalytic performance

Method used

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  • Solid acid catalyst and preparation method and application thereof in esterification transesterification
  • Solid acid catalyst and preparation method and application thereof in esterification transesterification

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Take quantitative graphene oxide suspension, weigh quantitative Al after ultrasonic 2 (SO 4 ) 3 9H 2 O was added to the GO suspension, and the mass ratio of graphene oxide to alumina in the product was controlled to be 2:1. After stirring evenly, the pH of the mixture was adjusted to about 7, and stirred at a constant temperature of 80°C for 2 hours. Take out the mixture and cool it down and leave it to age for 10 hours, filter and dry to obtain the aluminum oxide graphene nanocomposite material, denoted as GA 21 .

[0037] The above GO-Al 2 o 3 The nanocomposite material was impregnated by adding concentrated sulfuric acid in an amount of 100mg / mL, stirred evenly, ultrasonicated for 30 minutes, and reacted at 100°C for 12 hours, and the Al 2 o 3 Sulfation of GO and sulfonation of GO, filtered, washed and dried to obtain a solid acid catalyst, denoted as GAS 21 .

Embodiment 2

[0039] Take quantitative graphene oxide suspension, weigh quantitative Al after ultrasonic 2 (SO 4 ) 3 9H 2 O was added to the GO suspension, and the mass ratio of graphene oxide to alumina in the product was controlled to be 3:1. After stirring evenly, the pH of the mixture was adjusted to about 7, and stirred at a constant temperature of 80°C for 2 hours. Take out the mixture and cool it down and leave it to age for 10 hours, filter and dry to obtain the aluminum oxide graphene nanocomposite material, denoted as GA 31 .

[0040] The above GO-Al 2 o 3 The nanocomposite material was impregnated by adding concentrated sulfuric acid in an amount of 100mg / mL, stirred evenly, ultrasonicated for 30 minutes, and reacted at 100°C for 12 hours, and the Al 2 o 3 Sulfation of GO and sulfonation of GO, filtered, washed and dried to obtain a solid acid catalyst, denoted as GAS 31 .

Embodiment 3

[0042] Take quantitative graphene oxide suspension, weigh quantitative Al after ultrasonic 2 (SO 4 ) 3 9H 2 O was added to the GO suspension, and the mass ratio of graphene oxide and alumina in the product was controlled to be 4:1. After stirring evenly, the pH of the mixture was adjusted to about 7, and stirred at a constant temperature of 80°C for 2 hours. Take out the mixture and cool it down and leave it to age for 10 hours, filter and dry to obtain the aluminum oxide graphene nanocomposite material, denoted as GA 41 .

[0043] The above GO-Al 2 o 3 The nanocomposite material was impregnated by adding concentrated sulfuric acid in an amount of 100mg / mL, stirred evenly, ultrasonicated for 30 minutes, and reacted at 100°C for 12 hours, and the Al 2 o 3 Sulfation of GO and sulfonation of GO, filtered, washed and dried to obtain a solid acid catalyst, denoted as GAS 41 .

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Abstract

The invention discloses a solid acid catalyst and a preparation method and application thereof in esterification transesterification. The preparation method of the solid acid catalyst comprises the following steps of carrying out a liquid phase deposition reaction on a graphene oxide suspension dissolved with an aluminum salt to obtain aluminum oxide modified graphene oxide, and carrying out a mixed reaction on the aluminum oxide modified graphene oxide and concentrated sulfuric acid to obtain the solid acid catalyst. The preparation method is simple to operate, the method has the advantages of simple operation, mild conditions, very good catalysis effect on esterification and transesterification of the kitchen waste oil, realization of the fatty acid methyl ester yield higher than 90%, easy separation of the solid acid catalyst from the product, cyclic utilization after simple treatment, no pollution, and substantial reduction of the production cost of biodiesel prepared from the kitchen waste oil.

Description

technical field [0001] The invention relates to a solid acid catalyst, in particular to a solid acid catalyst for catalyzing the esterification or transesterification of kitchen waste oil and its preparation method and application, belonging to the technical field of solid acid catalyst preparation. Background technique [0002] At present, the catalysts used for transesterification are mainly alkali catalysts, such as sodium hydroxide, potassium hydroxide, sodium carbonate, etc. These catalysts have the advantages of mild reaction conditions and fast reaction rate, but the alkali-catalyzed transesterification reaction is harmful to the The content of water and free fatty acids is very sensitive, and waste cooking oil often contains a large amount of free fatty acids and water, so alkali-catalyzed transesterification is not suitable for catalyzing the transesterification of high acid value oils such as cooking waste oil. Therefore, acid catalysis is a more suitable method fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01J35/10B01J37/03C11C3/04C11C3/10
CPCB01J27/053B01J35/023B01J35/1004B01J37/0201B01J37/035C11C3/04C11C3/10Y02E50/10
Inventor 孙士权胡文涛欧吉何天豪李雪凝曾小康曾欣
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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