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Process for producing 1, 1, 1, 2-tetrafluoroethane by gas-liquid phase method

A tetrafluoroethane, gas-liquid phase technology, applied in the chemical industry, can solve the problems of aggravating equipment investment cost, high maintenance cost, fast equipment depreciation, etc., and achieves reduced equipment maintenance cost, low reaction temperature, and reduced corrosiveness. Effect

Inactive Publication Date: 2013-05-15
江苏卡迪诺节能保温材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many ways to prepare 1,1,1,2-tetrafluoroethane. At present, the gas phase method is usually used to produce 1,1,1,2-tetrafluoroethane. The first step: trichlorethylene and hydrogen fluoride in the fluorination Under the action of a catalyst, the temperature is 320-330 ° C to produce the intermediate product F133a; the second step: the raw material hydrogen fluoride and the intermediate product F133a are under the action of a fluorination catalyst at a temperature of 350-360 ° C to produce the finished product F134a, and the reaction conversion rate is 28% , the conversion rate is low, the reaction temperature required by this method is higher, the higher the temperature, the more corrosive hydrogen fluoride and hydrogen chloride generated in the reaction process will be to the equipment, the higher the requirements for consumables and their alloys and other materials, which will increase the equipment cost. Investment costs, resulting in rapid depreciation of equipment and high maintenance costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The process for producing 1,1,1,2-tetrafluoroethane by gas-liquid phase method, using trichlorethylene and hydrogen fluoride as raw materials, comprises the following steps:

[0015] a. The trichlorethylene and anhydrous hydrogen fluoride in the large raw material storage tank are respectively measured by the metering tank and pressurized by the metering pump, and enter the raw material mixing preheater with a molar ratio of 1:3. The preheating temperature is 60°C, and then enter F133a fluorination reactor, keep the temperature at 60°C, control the reaction pressure at 0.5MPa, put in the catalyst SbCl 5 , Catalyst SbCl 5 The mass of hydrogen fluoride accounts for 10% of the mass of anhydrous hydrogen fluoride, and the reaction generates F133a and hydrogen chloride, and simultaneously generates by-products F123 and unreacted F131, as well as excess hydrogen fluoride;

[0016] b. Put the above-mentioned mixture of F133a, hydrogen chloride, by-product F123, unreacted F131...

Embodiment 2

[0021] The process for producing 1,1,1,2-tetrafluoroethane by gas-liquid phase method, using trichlorethylene and hydrogen fluoride as raw materials, comprises the following steps:

[0022] a. The trichlorethylene and anhydrous hydrogen fluoride in the large raw material storage tank are respectively measured by the metering tank and pressurized by the metering pump, and enter the raw material mixing preheater with a molar ratio of 1:4. The preheating temperature is 65°C, and then enter F133a fluorination reactor, keep the temperature at 65°C, control the reaction pressure at 0.55MPa, put in the catalyst Cr 2 o 3 , catalyst Cr 2 o 3 The mass of hydrogen fluoride accounts for 15% of the mass of anhydrous hydrogen fluoride, and the reaction generates F133a and hydrogen chloride, and simultaneously generates by-products F123 and unreacted F131, as well as excess hydrogen fluoride;

[0023] b. Put the above-mentioned mixture of F133a, hydrogen chloride, by-product F123, unreact...

Embodiment 3

[0028] The process for producing 1,1,1,2-tetrafluoroethane by gas-liquid phase method, using trichlorethylene and hydrogen fluoride as raw materials, comprises the following steps:

[0029] a. The trichlorethylene and anhydrous hydrogen fluoride in the large raw material storage tank are respectively measured by the metering tank and pressurized by the metering pump, and enter the raw material mixing preheater with a molar ratio of 1:4. The preheating temperature is 65°C, and then enter F133a fluorination reactor, keep the temperature at 65°C, control the reaction pressure at 0.55MPa, put in the catalyst Cr 2 o 3 , catalyst Cr 2 o 3 The mass of hydrogen fluoride accounts for 20% of the mass of anhydrous hydrogen fluoride, and the reaction generates F133a and hydrogen chloride, and simultaneously generates by-products F123 and unreacted F131, as well as excess hydrogen fluoride;

[0030] b. Put the mixture of the above-mentioned F133a, hydrogen chloride, by-product F123, unr...

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Abstract

The invention relates to a process for producing 1, 1, 1, 2-tetrafluoroethane by a gas-liquid phase method. The method taking trichloro ethylene and hydrogen fluoride as raw materials comprises the following steps of: generating F133a, hydrogen chloride, F123 and F131 under the effect of a fluorinating catalyst of trichloro ethylene and hydrogen fluoride; performing reaction between potassium hydroxide liquor and hydrogen fluoride to generate potassium fluoride, and performing reaction between potassium fluoride and F133a in the presence of the fluorinating catalyst to generate the product 1, 1, 1, 2-tetrafluoroethane, wherein the temperature is controlled at 250-280 DEG C, and the reaction conversion rate reaches 80%. Hydrogen fluoride and hydrogen chloride generated in the reaction process are less in corrosion to the device, the corrosion to reaction by potassium fluoride is far less than that of hydrogen fluoride, and the investment on the device is less.

Description

technical field [0001] The invention relates to a process for producing 1,1,1,2-tetrafluoroethane by a gas-liquid phase method, which belongs to the field of chemical industry. Background technique [0002] 1,1,1,2-Tetrafluoroethane is the most widely used medium and low temperature environmentally friendly refrigerant. It does not destroy the ozone layer at all. It is currently recognized and recommended by most countries in the world. It is widely used in new refrigeration Initial installation and re-addition during maintenance on air conditioning equipment. There are many ways to prepare 1,1,1,2-tetrafluoroethane. At present, the gas phase method is usually used to produce 1,1,1,2-tetrafluoroethane. The first step: trichlorethylene and hydrogen fluoride in the fluorination Under the action of a catalyst, the temperature is 320-330 ° C to produce the intermediate product F133a; the second step: the raw material hydrogen fluoride and the intermediate product F133a are unde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/20C07C31/38
Inventor 杨惠民
Owner 江苏卡迪诺节能保温材料有限公司
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