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Preparation and application of stannate solid alkali catalyst

A solid super base and catalyst technology, applied in the preparation of organic compounds, carboxylic acid esters, organic carbonates, etc., can solve the problems of high temperature and pressure, low DMC yield, etc., and achieve simple composition and easy preparation Easy to use, small amount of effect

Inactive Publication Date: 2013-05-01
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take sodium stannate and place it in a roasting furnace under a nitrogen atmosphere, gradually increase the temperature at a rate of 5°C / min, until the temperature of the roasting furnace is 500°C, the flow rate of nitrogen in the process is 60ml / min, and then roast for 4 hours to obtain this reaction catalyst.

[0017] Get methyl alcohol and propylene carbonate by the molar ratio of 15:1, add in the reaction vessel, get the sodium stannate solid superbase catalyst that makes in front and join in the reaction system with 2.67wt% of reactant total amount; Under the conditions, the temperature of the reaction system was raised to 80° C., and the reaction was continued for 6 hours, cooled, filtered, and the catalyst was separated from the reaction solution. The reaction solution was analyzed by gas chromatography, and the conversion rate of PC was 91.8%.

[0018] Product analysis methods and conditions:

[0019] The product samples were analyzed and detected by GC9890F ga...

Embodiment 2

[0021] Sodium stannate was heated up to 600°C at a rate of 5°C / min in a hydrogen atmosphere and then calcined for 3 hours with a hydrogen flow rate of 80ml / min to obtain the reaction catalyst. All the other are the same as in Example 1, the reaction solution is analyzed by gas chromatography, and the conversion rate of PC is 92.1%.

Embodiment 3

[0023] Sodium stannate was heated to 450°C at 5°C / min under an argon atmosphere and then calcined for 6 hours with an argon flow rate of 50ml / min to obtain the reaction catalyst. All the other are the same as in Example 1, the reaction solution is analyzed by gas chromatography, and the conversion rate of PC is 90.5%.

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PUM

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Abstract

The invention provides a method for preparing a stannate solid alkali catalyst, which comprises the following steps of: taking one or more than two stannate or stannate hydrates; under the nitrogen atmosphere, placing the stannate or stannate hydrates into a roasting furnace; gradually raising the temperature to between 400 and 1,200 DEG C; and roasting for 2 to 12 hours so as to obtain the catalyst. The stannate solid alkali catalyst has the advantages of simple, convenient and practicable preparation, simple catalyst composition, high catalytic activity and application to a plurality of catalytic reactions.

Description

【Technical field】 [0001] The invention relates to the technical field of catalysis and organic chemical synthesis, in particular to the preparation and application of a stannate solid superbase catalyst. 【Background technique】 [0002] A solid base is a solid that can chemisorb acidic substances or that can discolor an acid indicator. Base strength of solid superbase (Hammert function H - ) greater than 26, it can also be considered that the intensity is higher than that of neutral substances (H - =7) 19 units higher in basic substances. It has been reported that H - >37 solid super base catalyst. As a catalyst, the solid superbase shows excellent performance in various reactions: (1) the catalytic activity is extremely high, 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, It is easy to separate from the product, and the process is simple; (3) the cataly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/14C07C69/96C07C68/06C07D211/82C07D211/02C07C49/78C07C45/68C07C49/83C07C45/73C07C271/28C07C269/04C07C69/618C07C67/343C07C45/72
Inventor 尹双凤张树国罗胜联韦玉丹陈浪邱仁华
Owner HUNAN UNIV