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Preparation of 1,1,1-trifluoroethane

A technology of trifluoroethane and anhydrous hydrofluoric acid, applied in halogen substitution preparation, organic chemistry, etc., can solve high production cost, short service life of catalyst, product rate, equipment utilization rate of equipment capacity and low labor efficiency, etc. question

Inactive Publication Date: 2009-01-21
ZHEJIANG XINGTENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the inert diluent does not participate in the reaction and must occupy the equipment, the product rate, equipment capacity, equipment utilization rate and labor efficiency are very low, the service life of the catalyst is very short, and the production cost is high

Method used

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  • Preparation of 1,1,1-trifluoroethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] The reaction kettle is 8 liters, the reactor is made of 16Mn material, the condenser is 0.4 square meters, and the number of reflux trays is 12. First add 3,500 grams of HCFC142b to the reactor, then add 1,000 grams of SbCl5, and heat with hot water to stabilize the temperature of the reactor at 15°C. The jacket of the condenser is fed with frozen brine to maintain the temperature at the top of the condenser at -5°C. HF, HCFC141b, feed according to the ratio. The reaction pressure reaches 1.3 MPa, and the products are released from the condenser at different reaction temperatures.

Embodiment 2

[0010] Control reaction temperature is 35 ℃, other are the same as embodiment one.

Embodiment 3

[0012] Control reaction temperature is 45 ℃, other are the same as embodiment one.

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PUM

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Abstract

The invention relates to a preparation method for trifluoroethane, in particular to a method for preparing 1, 1, 1-trifluoroethane (HFC143a) through catalytic fluorination of HCFC141b (i.e. 1, 1, 1-HCFC141b) and anhydrous hydrofluoric acid in the presence of a liquid phase catalyst. The method comprises HCFC141b, anhydrous hydrofluoric acid, the liquid phase catalyst and a diluent agent, and is characterized in that the diluent agent is a mixed solution of one or two of HCFC141b and HCFC142b; the liquid phase catalyst preferably adopts a SbCl5 catalyst, and the molar ratio of HF to HCFC141b during reaction is preferably controlled between 2.0 and 2.3; reaction temperature is preferably controlled between 10 and 75 DEG C; and reaction pressure is preferably controlled between 0.6 and 2.0MPa. The preparation method not only has high productivity, equipment productivity, utilization rate of equipment and labor work efficiency, but also can greatly prolong the service life of the catalyst and greatly reduce production cost.

Description

technical field [0001] The present invention relates to a kind of preparation method of trifluoroethane, especially a kind of preparation method of using HCFC141b (namely 1,1,1-dichlorofluoroethane) and anhydrous hydrofluoric acid to prepare 1 by catalytic fluorination under liquid phase catalyst, 1,1-Trifluoroethane (HFC143a) method. Background technique [0002] The Chinese patent No. 94101617.X discloses the "1,1,1-dichlorofluoroethane liquid-phase catalytic production of 1,1,1-trifluoroethane" method, which uses an inert diluent to catalyze the fluorination of 1 , 1,1-Trifluoroethane. Because the inert diluent does not participate in the reaction and must occupy the equipment, the product rate, equipment capacity, equipment utilization rate and labor efficiency are all very low, the service life of the catalyst is very short, and the production cost is very high. Contents of the invention [0003] For above problem, the purpose of the present invention is to provide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/20
Inventor 苗国祥应振洲葛濯非陈文亮
Owner ZHEJIANG XINGTENG CHEM
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