A kind of solid acid catalyst and its preparation method and application

A technology of solid acid catalysts and heteropolyacid salts, applied in chemical instruments and methods, physical/chemical process catalysts, dehydration of hydroxyl-containing compounds to prepare ethers, etc., can solve the problem of low yield, acid catalysts that cannot be recycled and reused, and recovery processes Complexity and other problems, to achieve high activity, simple production, simple separation effect

Inactive Publication Date: 2015-12-30
NANJING DECAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acid-catalyzed dehydration system generally has a low yield, needs to be added to a water outlet, and is prone to produce vanillyl ether and butyl ether by-products
Moreover, most acid catalysts cannot be recycled and reused, or will be damaged by water and the recycling process is complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Catalyst A preparation: Dissolve 300g of tin phosphotungstate in water, add 600g of activated carbon to the tin phosphotungstate solution and stir for 2 hours, add 100g of furfural and stir for 3 hours, evaporate to dryness in vacuo to obtain a black solid. The black solid was carbonized at 450° C. for 2 h under argon to obtain solid acid catalyst A containing 30% tin phosphotungstate.

Embodiment 2

[0017] Catalyst B preparation: Dissolve 400g of aluminum phosphotungstate in water, add 500g of activated carbon to the solution and stir for 4 hours, add 200g of furfuryl alcohol and stir for 2 hours, evaporate to dryness in vacuo to obtain a black solid. The black solid was carbonized under argon at 350° C. for 4 h to obtain solid acid catalyst B containing 40% aluminum phosphotungstate.

Embodiment 3

[0019] Preparation of Catalyst C: Dissolve 350g of gallium phosphotungstate in water, add 550g of activated carbon to the solution and stir for 3 hours, add 150g of glucose and stir for 4 hours, evaporate to dryness in vacuo to obtain a black solid. The black solid was carbonized at 550° C. for 3 h under argon to obtain solid acid catalyst C containing 35% phosphorous gallium tungstate.

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Abstract

The invention relates to a solid acid catalyst as well as a preparation method and an application thereof. The preparation method comprises the steps of loading metal salt of heteropolyacid by virtue of active carbon, and covering the surface of the active carbon with a carbon layer, so as to obtain the stable solid acid catalyst. The solid acid catalyst can be used for catalyzing citronellol and normal butanol under a mild condition to be subjected to etherification so as to obtain citronellol butyl ether. According to the solid acid catalyst, a process is environmentally-friendly, the catalyst can be repeatedly used, the citronellol butyl ether is easy to separate, and no waste is discharged.

Description

technical field [0001] The invention relates to a solid acid catalyst and its preparation method and application, in particular to the production of a solid Lewis acid and the synthesis of vanillyl butyl ether using the catalyst. The solid acid catalyst is a stable acid catalyst obtained by using activated carbon to support metal salts of heteropolyacids and covering the surface with a carbon layer. Background technique [0002] Vanillyl ether, also known as capsicum ether, has a strong curry aroma and is widely used as a food flavoring agent. And because of the remarkable heating effect, it has the effect of accelerating the blood circulation of the human body and causing a local heating sensation. As a heating agent in cosmetics, it is especially suitable for women's cleansing in cold winter, and as a heating agent in plasters, it has the effect of dispelling wind and cold. Among them, vanillyl butyl ether is most widely used in food and cosmetics. In the traditional syn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/18B01J31/16C07C43/15C07C41/09
Inventor 高丹常俊黄军
Owner NANJING DECAN CHEM
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