Preparation method of 1, 1, 2, 2-tetrafluoroethane

A technology of tetrafluoroethane and sodium tetrafluoropropionate, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of TFE self-polymerization explosion, incapability of long-distance transportation, and existence of safety risks. Stable long-term production, simple process, and beneficial to industrialization

Pending Publication Date: 2021-01-29
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many shortcomings in the preparation of R134 by catalytic hydrogenation of TFE, which leads to difficulties in industrial production: difficulty in obtaining raw materials, harsh storage conditions for TFE, easy self-polymerization and explosion, and cannot be transported remotely, so sampling can only be done nearby; the reaction temperature and pressure are high, and it is more likely to cause The self-polymerization explosion of TFE has safety risks; under high temperature and high pressure, the catalyst is easily deactivated and has a short life

Method used

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  • Preparation method of 1, 1, 2, 2-tetrafluoroethane

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Effect test

Embodiment 1

[0017] Add 336g (2mol) of sodium 2,2,3,3-tetrafluoropropionate, 36g (2mol) of water, and 504g of tetraethylene glycol dimethyl ether into a 2L high-pressure reactor, raise the temperature to 220°C and keep the reaction pressure at 1.4MPa During the reaction, the generated 1,1,2,2-tetrafluoroethane gas was dried and collected into a steel cylinder, and the conversion rate of 2,2,3,3-tetrafluoropropionate sodium was 99.1%, 1,1 , 2,2-tetrafluoroethane selectivity 95.7%.

Embodiment 2

[0019] Add 336g (2mol) of sodium 2,2,3,3-tetrafluoropropionate, 18g (1mol) of water, and 336g of tetraethylene glycol dimethyl ether into a 2L high-pressure reactor, raise the temperature to 250°C and keep the reaction pressure at 2.0MPa During the reaction, the generated 1,1,2,2-tetrafluoroethane gas was dried and collected into a steel cylinder, and the conversion rate of 2,2,3,3-tetrafluoropropionate sodium was 99.8%, 1,1 , 2,2-tetrafluoroethane selectivity 90.4%.

Embodiment 3

[0021] Add 336g (2mol) of sodium 2,2,3,3-tetrafluoropropionate, 72g (4mol) of water, and 672g of sulfolane into a 2L high-pressure reactor, raise the temperature to 200°C and keep the reaction pressure at 1.2MPa. The 1,1,2,2-tetrafluoroethane gas was dried and collected into steel cylinders, and the conversion rate of 2,2,3,3-tetrafluorosodium propionate was 95.2%. 1,1,2,2-tetrafluoroethane Fluoroethane selectivity 98.3%.

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Abstract

The invention discloses a preparation method of 1, 1, 2, 2-tetrafluoroethane, which is characterized by comprising the following steps of: adding sodium 2, 2, 3, 3-tetrafluoropropionate, a solvent andwater into a high-pressure reaction kettle, removing oxygen from the reaction kettle by replacing oxygen with nitrogen, and heating for reaction, thereby generating 1, 1, 2, 2-tetrafluoroethane. Themethod has the advantages of simple process, avoidance of explosive TFE tetrafluoroethylene, easily available raw materials, no geographical limitation, high safety, no use of a catalyst, stable long-term production, and facilitation of industrialization.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, in particular to a preparation method of 1,1,2,2-tetrafluoroethane. Background technique [0002] 1,1,2,2-tetrafluoroethane, English name 1,1,2,2-tetrafluoroethane, referred to as R134, HFC-134. R134 is a kind of HFC refrigerant that has appeared in recent years. It is an isomer of R134a. It is non-toxic, non-flammable, ODP is zero, and the GWP value is much smaller than R134a. It is a very potential alternative refrigerant and has been listed. One of the substitutes for CFC-12. R134 can also form a mixed working fluid with HC substances to obtain a more environmentally friendly alternative working fluid. As a pure refrigerant, R134 has great performance advantages and application potential for ordinary household refrigerators and air conditioners whose freezer temperature is higher than -19°C. [0003] At present, the main method of synthesizing R134 is the catalytic hydrogenation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/363C07C19/08
CPCC07C17/363C07C19/08
Inventor 张万宏
Owner JUHUA GROUP TECH CENT
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