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Fluorination catalyst for preparing difluoromethane or monochlorodifluoromethane, preparation method and application

A technology of difluorochloromethane and fluorination catalysts, which is applied in the fields of physical/chemical process catalysts, chemical instruments and methods, preparation of halogenated hydrocarbons, etc., which can solve the impact of normal production operation, low by-product generation, strong corrosion, etc. problems, and achieve the effects of low manufacturing cost, convenient post-processing, and less waste

Active Publication Date: 2012-07-04
LINHAI LIMIN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the mass ratio of hydrogen fluoride to chlorodifluoromethane is generally about 2.0 to 4.0, and the conversion rate is very high. During the reaction, unreacted substances and intermediate products are recycled through the condensing reflux tower, and the amount of by-products generated is very low. If the raw material contains a small amount of water, the corrosion will be very strong, resulting in equipment damage and affecting the normal operation of production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Preparation of cocatalyst supported by activated carbon

[0025] First, 150kg of activated carbon is vacuumed under a vacuum pump of -60kPa for pretreatment, and 37.5kg of metal sulfate NaAl(SO 4 ) 2 Dissolved in deionized water at normal temperature and pressure to reach a supersaturated state, the saturated solution was taken out, and then the above-mentioned treated activated carbon and NaAl(SO 4 ) 2 The saturated solution is fully mixed and stirred evenly. After dehydration under vacuum conditions, the mixture is rinsed with deionized water while vacuuming. Finally, it is left to dry and the mixture is dried thoroughly in a dryer at 250 ° C. Dehydrated, ground into powder by a grinder, and sieved through 200 mesh to obtain a co-catalyst.

[0026] Above-mentioned carrier replaces activated carbon with one or more mixtures in activated carbon, aluminum oxide, magnesium oxide, diatomaceous earth or silicon dioxide, and metal sulfates use NaAl(SO 4 ) 2 ,...

Embodiment 2

[0027] Example 2 Preparation of cocatalyst supported by diatomaceous earth

[0028] Firstly, 150kg of the mixture of diatomite, silicon dioxide and alumina with a weight ratio of 1:2:1 is evacuated under a vacuum pump of -80kPa for pretreatment. In addition, 16kg of metal sulfate KAl(SO 4 ) 2 Dissolved in deionized water at normal temperature and pressure to reach a supersaturated state, then, the above activated carbon and KAl(SO 4 ) 2 The saturated solution is fully mixed and stirred evenly. After dehydration under vacuum conditions, the mixture is rinsed with deionized water while vacuuming. Finally, it is left to dry and the mixture is thoroughly dried in a dryer at 250 ° C. Dehydrated, ground into powder by a grinder, and sieved with 300 mesh to obtain a fluorination catalyst.

Embodiment 3

[0029] Example 3 Preparation of co-catalyst supported by diatomite and activated carbon

[0030] First, 150kg of diatomite and activated carbon with a weight ratio of 1:1 are vacuumed under a -70kp vacuum pump for pretreatment, and 26kg of metal sulfate KCr(SO 4 ) 2 Dissolved in deionized water at normal temperature and pressure to reach a supersaturated state, then, the above activated carbon and KCr (SO 4 ) 2 The saturated solution is fully mixed and stirred evenly. After dehydration under vacuum conditions, the mixture is rinsed with deionized water while vacuuming. Finally, it is left to dry and the mixture is thoroughly dried in a dryer at 250 ° C. Dehydrated, ground into powder by a grinder, and sieved to 250 mesh to obtain a co-catalyst.

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PUM

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Abstract

The invention relates to a fluorination catalyst for preparing difluoromethane or monochlorodifluoromethane, a preparation method and an application and belongs to the catalyst preparation technology. An antimonial chloride and a promoter are mixed to be the fluorination catalyst, wherein the promoter comprises metal sulfates and a carrier; the weight percentage of the antimonial chloride to the promoter is (50-70):(30-50); the weight percentage of the carrier to the metal sulfates is (80-90):(10-20); and the obtained fluorination catalyst is used for preparing the difluoromethane or monochlorodifluoromethane. The fluorination catalyst provided by the invention is low in preparation cost and is used for preparing the difluoromethane or monochlorodifluoromethane; the operation process is simple and the condition is mild; the purity of the difluoromethane or monochlorodifluoromethane reaches up to 99%; the corrosion to equipment is small; the service life is long; the service life of the reaction equipment of the difluoromethane is increased from 2-6 months to more than 6-18 months; and the service life of the reaction equipment of the monochlorodifluoromethane is increased from 12-18 months to more than 24-36 months.

Description

technical field [0001] The invention belongs to catalyst preparation technology, and in particular relates to a fluorination catalyst for preparing difluoromethane or difluorochloromethane, a preparation method and an application. Background technique [0002] Difluoromethane, chemical formula CH 2 f 2 , commonly known as HFC-32, has excellent environmental performance, the ozone depletion potential (ODP) of the atmosphere is 0, the global warming potential (GWP) is 0.12, and it also has excellent performance. The mixture of difluoromethane and other ODS substitutes such as pentafluoroethane (commonly known as HFC-125) is used as a refrigerant to replace HCFC-22 and also has energy-saving effects. It has a wide range of uses and a very broad development prospect. It occupies an important position in ODS substitutes and is the main variety. It is estimated that the global annual demand for difluoromethane will exceed 100,000 tons. Chlorodifluoromethane has the chemical fo...

Claims

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Application Information

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IPC IPC(8): B01J27/125B01J27/128B01J27/132B01J27/135C07C19/10C07C19/08C07C17/35
CPCY02P20/582
Inventor 何建明何甫长金崇献金望志裴文
Owner LINHAI LIMIN CHEM
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