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Preparation method of surface modification calcium oxide

A surface modification and calcium oxide technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of poor water absorption resistance, low stability, and low solubility, and achieve good water absorption resistance and stability sex high effect

Inactive Publication Date: 2010-08-18
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limestone can be calcined to get quicklime, its main component is calcium oxide, calcium oxide is cheap, strong in alkalinity, its solubility in organic solvent is very small, and its preparation method is simple, it has been used as a solid base catalyst in various base-catalyzed reactions It has good catalytic activity, but due to the extremely fast adsorption of water and carbon dioxide on the surface of calcium oxide, it is easily inactivated by the erosion of water and carbon dioxide in the reaction system, so it has the disadvantages of low stability and poor water absorption capacity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of surface modified calcium oxide, comprising the following steps:

[0017] The first step is to pulverize calcium oxide, pass through a 100-mesh sieve, and sieve the calcium oxide fine powder for use.

[0018] In the second step, 100 mesh calcium oxide fine powders are dispersed in a container of 10 times the quality of anhydrous organic solvent, and the solvent is ethanol through anhydrous treatment,

[0019] The 3rd step, add the dehydrated alcohol solution of n-bromobutane in container under stirring, the substance ratio of added bromoethane and calcium oxide fine powder is 10000: 1,

[0020] In the fourth step, the reactant in the third step was stirred at a temperature of 78°C for 12 hours to obtain a modified calcium oxide precipitate,

[0021] The fifth step is to filter the modified calcium oxide precipitate with qualitative analysis filter paper and wash it with absolute ethanol until the modified calcium oxide has no modifier smell.

[...

Embodiment 2

[0025] A preparation method of surface modified calcium oxide, comprising the following steps:

[0026] The first step is to pulverize calcium oxide, pass through a 110-mesh sieve, and sieve the calcium oxide fine powder for use.

[0027] In the second step, 110 mesh calcium oxide fine powders are dispersed in a container of 11 times the mass of anhydrous organic solvent, and the solvent is normal hexane through anhydrous treatment,

[0028] The 3rd step, add the anhydrous n-hexane solution of n-bromobutane in container under stirring, the mass ratio of added n-butane bromide and calcium oxide fine powder is 10000: 1,

[0029] In the fourth step, the reactant in the third step was stirred at a temperature of 50° C. for 12 hours to obtain a modified calcium oxide precipitate,

[0030] The fifth step is to filter the modified calcium oxide precipitate with qualitative analysis filter paper and wash it with anhydrous n-hexane until the modified calcium oxide has no modifier smel...

Embodiment 3

[0034] A preparation method of surface modified calcium oxide, comprising the following steps:

[0035] The first step is to pulverize calcium oxide, pass through a 120-mesh sieve, and sieve the calcium oxide fine powder for use.

[0036] In the second step, the 120 mesh calcium oxide fine powder is dispersed in a container of 12 times the quality of anhydrous organic solvent, and the solvent is ethanol through anhydrous treatment,

[0037] The 3rd step, add the dehydrated alcohol solution of propylene bromide in container under stirring, the substance ratio of added propylene bromide and calcium oxide fine powder is 10000: 1,

[0038] In the fourth step, the reactant in the third step was stirred at a temperature of 100° C. for 12 hours to obtain a modified calcium oxide precipitate,

[0039] The fifth step is to filter the modified calcium oxide precipitate with qualitative analysis filter paper and wash it with absolute ethanol until the modified calcium oxide has no modif...

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PUM

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Abstract

The invention relates to a preparation method of surface modification calcium oxide, which comprises the steps of: first, grinding calcium oxide, and then dispersing the fine powder of the calcium oxide into a container of anhydrous organic solvent; then, adding anhydrous organic solvent solution of halogenated hydrocarbon into the container when stirring, and stirring reactant to obtain modified calcium oxide precipitation; filtering the modified calcium oxide precipitation by qualitative analysis filter paper, and washing by anhydrous organic solvent until the modified calcium oxide has no smell of modifying agent; and finally, vacuum drying the washed calcium oxide, and obtaining the finished product surface modification calcium oxide. As the calcium oxide has strong alkalinity and belongs to super-strong alkali, and the halogenated hydrocarbon has active carbon-halogen bond, the obtained surface modification calcium oxide has the advantages of high stability and good water absorption resisting capability, and can be used for the fields of solid alkali catalyst modification and calcium oxide material preparation.

Description

technical field [0001] The invention relates to the technical field of preparation of calcium oxide materials, in particular to a preparation method of surface-modified calcium oxide. Background technique [0002] my country is one of the countries rich in limestone mineral resources in the world. Its geographical distribution is extensive. Except for Shanghai, Hong Kong and Macao, it is distributed in all provinces, municipalities and autonomous regions. my country is also a major country in lime industry. Lime products rank first in the world. The technology and craftsmanship are very mature. Limestone can be calcined to get quicklime, its main component is calcium oxide, calcium oxide is cheap, strong in alkalinity, its solubility in organic solvent is very small, and its preparation method is simple, it has been used as a solid base catalyst in various base-catalyzed reactions It has good catalytic activity, but due to the extremely fast adsorption of water and carbon di...

Claims

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Application Information

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IPC IPC(8): C01F11/02
Inventor 汤颖陈刚顾雪凡
Owner XI'AN PETROLEUM UNIVERSITY
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