Catalyst used for preparing hydroxy acetone by glycerol dewatering, preparation and application thereof

The technology of hydroxyacetone and catalyst is applied in the field of metal additives modified copper chromite catalyst, which can solve the problems of insufficient stability, coking and deactivation, etc., and achieve the effects of prolonging the service life, improving the activity and reducing the reaction temperature.

Inactive Publication Date: 2010-04-28
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the glycerin dehydration reaction, although the copper chromite catalyst has high activity, its stability is not enough, and it is prone to coking and deactivation after repeated use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0021] Weigh 5.4 g of copper chromite powder and 0.62 g of zirconia, dissolve the zirconia in 30 ml of ethanol, add copper chromite powder, adjust the pH value to 6.0 with a volume ratio (the same below) of 1:1 nitric acid solution, and ultrasonicate for 60 Minutes, stirred at a constant temperature of 50°C for 3 hours, filtered, washed with deionized water until the pH was neutral, then placed in an oven and dried at a constant temperature of 120°C for 4 hours, taken out and ground, placed in a tube furnace for calcination at 350°C for 3 hours , to obtain the desired zirconium-modified copper chromite catalyst sample.

[0022] Take a three-necked flask with a capacity of 125ml, connect it to a cooling water circulation device, heat it through a silicone oil bath, and keep the temperature at 220°C. Use a circulating water-type multi-purpose vacuum pump to depressurize it. In the reactor, weigh 1.5g of the above-mentioned catalyst, First heat the catalyst to the reaction temper...

Embodiment 3

[0024] Weigh 5.4g copper chromite powder, 2.2g zinc nitrate hexahydrate, dissolve zinc nitrate with 30ml ethanol, add copper chromite powder, adjust pH value to 6.0 with 1:1 nitric acid solution, ultrasonic for 60 minutes, constant temperature 50 Stir at ℃ for 3 hours, filter, wash with deionized water until the pH is neutral, place and dry in an oven at a constant temperature of 120°C for 4 hours, take it out and grind it, and place it in a tube furnace for calcination at 350°C for 3 hours to obtain the obtained The desired zinc-modified copper chromite catalyst samples.

[0025] Take a three-necked flask with a capacity of 125ml, connect it to a cooling water circulation device, heat it through a silicone oil bath, and keep the temperature at 220°C. Use a circulating water-type multi-purpose vacuum pump to depressurize it. In the reactor, weigh 1.5g of the above-mentioned catalyst, First heat the catalyst to the reaction temperature, then immediately pour 30g of 70% glycerol...

Embodiment 4

[0027] Weigh 5.4g of copper chromite powder and 0.62g of titanium oxide, dissolve titanium oxide with 30ml of ethanol, add copper chromite powder, adjust the pH value to 6.0 with 1:1 nitric acid solution, ultrasonic for 60 minutes, and stir at a constant temperature of 50°C After 3 hours, filter, wash with deionized water until the pH is neutral, place it in an oven and dry at a constant temperature of 120°C for 4 hours, take it out and grind it, and place it in a tube furnace for calcination at 350°C for 3 hours to obtain the desired Titanium-modified copper chromite catalyst samples.

[0028]Take a three-necked flask with a capacity of 125ml, connect it to a cooling water circulation device, heat it through a silicone oil bath, and keep the temperature at 220°C. Use a circulating water-type multi-purpose vacuum pump to depressurize it. In the reactor, weigh 1.5g of the above-mentioned catalyst, First heat the catalyst to the reaction temperature, then immediately pour 30g of...

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PUM

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Abstract

The invention relates to a catalyst used for preparing hydroxy acetone by glycerol dewatering, preparation and an application thereof. The main component of the catalyst is copper chromite. A metal auxiliary agent is respectively one of the components of zinc, aluminum, magnesium, zirconium, titanium and the like and is prepared by a dipping method. The auxiliary agent metal is in the catalyst in an oxide form of the auxiliary agent metal. The catalyst is suitable for preparing the hydroxy acetone by crude glycerine dewatering. The catalyst has simple preparation process, and the introduction of the metal auxiliary agent can enhance the activity of the catalyst, lower the reaction temperature obviously, enhance the yield of the hydroxy acetone and prolong the service life of the catalyst.

Description

technical field [0001] The invention relates to a metal additive modified copper chromite catalyst, a preparation method thereof and an application in preparing hydroxyacetone by dehydrating crude glycerin. Background technique [0002] In recent years, non-toxic, biodegradable, high flash point, high cetane number, environment-friendly, green alternative fuel - biodiesel has attracted more and more attention and favor from all over the world. Glycerol is the main by-product in the process of biodiesel production, which can be further converted into fuels and chemicals. The US Department of Energy lists it as the 12 most important "BUILDING BLOCK" molecules in the future biomass development process. Due to the large-scale production of biodiesel, the price of glycerol in the international market has dropped by 50% in recent years. Therefore, the production of more commercially valuable chemical products using glycerol as a raw material will become the key and guarantee for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/86B01J23/80B01J21/06B01J21/10C07C49/17C07C45/29
Inventor 李浔谢丹周志明张跃飞戴益民朱志平周艺
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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