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Novel nano-solid strong base catalyst, preparation method thereof and application thereof

A base catalyst and solid technology, which is applied in the field of new nano-solid strong base catalyst and its preparation and application, can solve the problems of low DMC yield, high temperature and pressure, etc., and achieve the advantages of simple preparation, simple composition and small dosage Effect

Inactive Publication Date: 2010-11-10
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these catalysts require relatively high temperature and pressure, and the DMC yield is relatively low

Method used

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  • Novel nano-solid strong base catalyst, preparation method thereof and application thereof
  • Novel nano-solid strong base catalyst, preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 3.4g of SnCl 4 ·5H 2 O is dissolved in the NaOH solution of pH=12 to obtain a transparent solution, to which adding a mass fraction of 30% absolute ethanol solution (that is, the absolute ethanol solution accounts for 30% of the mass in the entire reaction system), and then the solution Put it into a crystallization kettle and crystallize at 150°C for 24 hours. The obtained precipitate was centrifuged, washed with water, dried, and heated to 450° C. for 4 hours under nitrogen at a rate of 5° C. / min and roasted for 4 hours to obtain the catalyst.

[0031] Add methanol, propylene carbonate and the above-mentioned catalyst into the reactor, the mol ratio of methanol and propylene carbonate is 9: 1, the catalyst consumption is 2.64wt%, and the reaction temperature is 60°C. After reacting for 6 hours, the product is centrifuged and taken The supernatant was analyzed by gas chromatography, and the conversion rate of PC was 53.4%.

[0032] The analysis of the product a...

Embodiment 2

[0035] Take 3.4g of SnCl 4 ·5H 2 O was dissolved in a pH=12 NaOH solution to obtain a transparent solution, 20% of the total mass of absolute ethanol was added thereto, and then the solution was placed in a crystallization kettle for crystallization at 150° C. for 8 hours. The obtained precipitate was centrifuged, washed with water, dried, and calcined at 5°C / min to 500°C for 4 hours under nitrogen to obtain the catalyst.

[0036] Ethanol, propylene carbonate and above-mentioned catalyst are added in the reactor, and the molar ratio of ethanol and propylene carbonate is 15: 1, and catalyst consumption is 2.64wt%, and reaction temperature is 120 ℃, after reacting for 6 hours, centrifugation of product, take The supernatant was analyzed by gas chromatography, and the conversion rate of PC was 33.6%.

Embodiment 3

[0038] Take 3.4g of SnCl 4 ·5H 2 O was dissolved in a pH=13 NaOH solution to obtain a transparent solution, 40% of the total mass of absolute ethanol was added thereto, and then the solution was placed in a crystallization tank and crystallized at 180° C. for 24 hours. The obtained precipitate was centrifuged, washed with water, dried, and heated to 550° C. for 6 hours under nitrogen at a rate of 5° C. / min and calcined for 6 hours to obtain the catalyst.

[0039] Add methanol, propylene carbonate and the above-mentioned catalyst into the reactor, the mol ratio of methanol and propylene carbonate is 15: 1, the catalyst consumption is 2.64wt%, and the reaction temperature is 80°C. After reacting for 6 hours, the product is centrifuged and taken The supernatant was analyzed by gas chromatography, and the conversion rate of PC was 79.7%.

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PUM

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Abstract

The invention provides a novel nano-solid strong base catalyst, which comprises the following raw material components in part by weight: 2.07 to 2.42 parts of halogenated tin, 1.99 to 3.09 parts of inorganic basic compound, 9.61 to 67.48 parts of ethanol and 28.50 to 85.23 parts of water. The invention also provides a preparation method and application of the novel nano-solid strong base catalyst. The novel nano-solid strong base catalyst provided by the invention has the advantages of simple composition, high catalytic activity and simple, convenient and easy preparation; when applied to various catalytic reactions, the catalyst is used in small dosage and has no corrosion to reactors and therefore is an environmental-friendly catalyst; and after the reaction is finished, the catalyst can be separated through centrifugation for reusing.

Description

【Technical field】 [0001] The invention relates to the technical field of catalysis and organic chemical synthesis, in particular to a novel nanometer solid strong base catalyst and its preparation and application. 【Background technique】 [0002] A solid base is a solid that can chemically adsorb acidic substances or that can change the color of an acid indicator. Solid strong base as a catalyst shows excellent effects in various reactions: (1) high catalytic activity, which can make the reaction conditions mild, and as a solid, it can withstand high temperature; (2) the selectivity is extremely high, the product purity is high, and it is easy It is separated from the product, and the process is simple; (3) the catalyst can be used repeatedly and continuously; (4) it is less corrosive to reaction equipment and has less waste water. In addition, solid strong base catalyst overcomes the deactivation phenomenon of solid strong acid catalyst due to coking with its unique perform...

Claims

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Application Information

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IPC IPC(8): B01J27/232B01J27/135B01J27/24C07C69/96C07C68/06C07D211/82C07D211/02C07C49/78C07C45/68C07C49/83C07C45/73C07C271/28C07C269/04C07C69/618C07C67/343C07C45/72
Inventor 尹双凤张树国罗胜联韦玉丹陈浪邱仁华
Owner HUNAN UNIV
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