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Producing process for synthesizing 1, 1, 1, 2-tetrafluoroethane by liquid phase-gas phase method

A kind of technology of tetrafluoroethane and production process, applied in the field of liquid phase-gas phase method synthesis 1

Active Publication Date: 2010-02-17
JIANGSU SANMEI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned problems existing in the industrial production of existing synthetic HFC-134a, the present invention provides a kind of liquid phase- Production process of gas phase synthesis of 1,1,1,2-tetrafluoroethane

Method used

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  • Producing process for synthesizing 1, 1, 1, 2-tetrafluoroethane by liquid phase-gas phase method
  • Producing process for synthesizing 1, 1, 1, 2-tetrafluoroethane by liquid phase-gas phase method
  • Producing process for synthesizing 1, 1, 1, 2-tetrafluoroethane by liquid phase-gas phase method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] According to the above process flow and steps, 10KgSbCl is installed in a 50L liquid phase reactor 1 5And drop into 20KgHF after activating for 5 hours, then drop into TCE, HF continuously simultaneously, TCE, HF feeding mass ratio is 1.7: 1, and the feeding rate of TCE is 3Kg / h, and reaction temperature is controlled at 45 ℃, and reaction pressure is controlled at 0.5Mpa, The temperature at the top of the reaction reflux column 2 is controlled at 26°C. The top temperature of the separation tower 7 is controlled at -35°C, the tower pressure is 0.8MPa, and the discharge temperature in the tower is 50°C. After the operation is stable, the reflux exhaust, the discharge sampling chromatographic analysis results in the separation tower 7 are shown in Table 1.

[0032] Table I

[0033]

[0034] From the data in Table 1, it can be concluded that the conversion rate of TCE is close to 100%, and the HCFC-133a and HF azeotrope extracted from the separation tower have less im...

Embodiment 2

[0036] By the operating steps of Example 1, 1Kg SbCl is charged in the liquid phase reactor 1 5 And put in 20KgHF and other conditions remain unchanged, after the operation is stable, the reflux exhaust, the discharge sampling chromatographic analysis results in the separation tower are shown in Table 2.

[0037] Table II

[0038]

[0039] Conclusion: As can be seen from the data in Table 2, when other conditions remain unchanged, HF and catalyst SbCl 5 When the mass ratio of TCE is greater than 15, the conversion rate of TCE decreases.

Embodiment 3

[0041] By the operating steps of Example 1, 5Kg SbCl is charged in the liquid phase reactor 1 5 And put in 5KgHF and other conditions remain unchanged, after the operation is stable, the reflux exhaust, the discharge sampling chromatographic analysis results in the separation tower are shown in Table 3.

[0042] Table three

[0043]

[0044] Conclusion: According to the above data, when the mass of antimony pentachloride and hydrogen fluoride accounts for a small amount of materials in the reactor, the conversion rate of TCE decreases, which is not conducive to the liquid phase fluorination reaction.

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Abstract

The invention discloses a producing process for synthesizing 1, 1, 1, 2-tetrafluoroethane by a liquid phase-gas phase method, comprising three steps: firstly, using trichloroethylene and hydrogen fluoride to synthesize 1, 1, 1-trifluoro-2- chloroethane by the liquid phase method under the action of a catalyst antimony pentachloride; sencondly, extracting and separating 1, 1, 1-trifluoro-2- chloroethane, hydrogen fluoride azeotrope, i.e. separating the mixed gas and the liquid phase coarse product obtained in the first step in a separating tower from a phase to another phase, separating the hydrogen chloride from the top of the tower, extracting the 1, 1, 1-trifluoro-2- chloroethane, hydrogen fluoride azeotrope from the tower, circulating a tower kettle with high-boiling to a liquid phase fluorinated reaction kettle; and thirdly, carrying out a gas phase fluorinated reaction on the 1, 1, 1-trifluoro-2- chloroethane obtained through the chromatography by a laminator and the hydrogen fluoride through a gasifier in the gas phase fluorinated reactor. The process has advantages of high conversion rate of the trichloroethylene, good selectivity, long service life of the catalyst, high yield, simple separating operation, low consumption and the like.

Description

technical field [0001] The invention relates to a production process for synthesizing 1,1,1,2-tetrafluoroethane, in particular to a production process for synthesizing 1,1,1,2-tetrafluoroethane by a liquid phase-gas phase method. Background technique [0002] 1,1,1,2-Tetrafluoroethane HFC-134a is the earliest developed and most widely used hydrofluorocarbon. Its thermodynamic properties and safety are similar to CFC-12. It has been widely used in automobile air conditioners, household appliances, etc. Use refrigerators, industrial and commercial refrigeration and medical aerosol projection, etc. Its demand is growing at a rate of 15% per year. [0003] At present, the main production methods for the conventional synthesis of HFC-134a are the trichlorethylene method and the tetrachlorethylene method. Most manufacturers use the trichlorethylene method. This route uses trichlorethylene TCE and hydrogen fluoride HF as raw materials. Under the action of a catalyst, the first st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/35C07C17/20B01J27/10
Inventor 占林喜胡有团何晓玲
Owner JIANGSU SANMEI CHEM
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