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Preparation method for 1,1,1,3,3-pentafluoropropane

A technology for pentafluoropropane and trifluoropropane, which is applied in the field of synthesis of hydrofluorochlorocarbons, can solve the problems of difficult preparation of raw materials, high cost of raw materials, etc., and achieves the effects of high conversion rate, good selectivity and high efficiency

Active Publication Date: 2014-03-12
JUHUA GROUP TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction is a batch production, and there are problems such as difficult preparation of raw materials and high cost of raw materials

Method used

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  • Preparation method for 1,1,1,3,3-pentafluoropropane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 4.32 moles of fluorinated antimony pentachloride and 12.96 moles of anhydrous hydrofluoric acid into a 2L liquid-phase reactor, heat up to 80°C, and add 3,3-dichloro-1,1,1-trifluoropropane (0.72 mol / hour) and anhydrous hydrofluoric acid (3.6 mol / hour) are continuously fed into the reactor at a molar ratio of 1:5 for reaction, and the pressure of the reactor is maintained at 0.6MPa, and the gas phase reaction product is collected and cooled , washing with water and washing with alkali to obtain 1,1,1,3,3-pentafluoropropane product. After continuing the reaction for 72 hours, the collected products were analyzed, and the reaction conversion rate was 97.8%, and the selectivity was 98.7%.

Embodiment 2

[0035] Add 6 moles of fluorinated tin tetrachloride and 12 moles of anhydrous hydrofluoric acid into a 2L liquid-phase reactor, heat up to 120°C, add 3,3-dichloro-1,1,1-trifluoropropane (0.6 mol / hour) and anhydrous hydrofluoric acid (1.2 mol / hour) are continuously fed into the reactor at a molar ratio of 1:2 for reaction, and the pressure of the reactor is maintained at 1.0MPa, and the gas phase reaction product is collected and cooled , washing with water and washing with alkali to obtain 1,1,1,3,3-pentafluoropropane product. After continuing the reaction for 72 hours, the collected products were analyzed, and the reaction conversion rate was 94.2%, and the selectivity was 95.1%.

Embodiment 3

[0037] Add 0.6 moles of fluorinated titanium tetrachloride and 3.6 moles of anhydrous hydrofluoric acid into a 1L liquid-phase reactor, heat up to 100°C, add 3,3-dichloro-1,1,1-trifluoropropane (0.3 mol / hour) and anhydrous hydrofluoric acid (3 mol / hour) are continuously fed into the reactor at a molar ratio of 1:10 for reaction, and the pressure of the reactor is maintained at 0.8MPa, and the gas phase reaction product is collected and cooled , washing with water and washing with alkali to obtain 1,1,1,3,3-pentafluoropropane product. After continuing the reaction for 72 hours, the collected products were analyzed, and the reaction conversion rate was 94.2%, and the selectivity was 96.0%.

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Abstract

The invention discloses a liquid phase continuous preparation method for 1,1,1,3,3-pentafluoropropane. The preparation method comprises the following steps: (1) adding a fluorination catalyst and anhydrous hydrofluoric acid into a reaction vessel, wherein a mol ratio of the fluorination catalyst to the anhydrous hydrofluoric acid is 1: 2-6; (2) continuously adding the anhydrous hydrofluoric acid and 1,1-dichloro-3,3,3-trifluoropropane according to a mol ratio of 2-10: 1 into the reaction vessel for a reaction with reaction temperature being 50 to 120 DEG C and reaction pressure being 0.3 to 1.0 MPa, wherein a mol ratio of the fluorination catalyst to 1,1-dichloro-3,3,3-trifluoropropane added into the reaction vessel per hour is 2-20: 1; and (3) collecting a reaction product and subjecting the reaction product to water scrubbing and alkali washing so as to obtain 1,1,1,3,3-pentafluoropropane. The preparation method has the advantages of simple process, mild reaction conditions, a high conversion rate and good selectivity.

Description

technical field [0001] The invention relates to a synthesis method of hydrofluorochlorocarbons, in particular to a synthesis method of 1,1,1,3,3-pentafluoropropane. Background technique [0002] Fluorocarbons have been widely used in industry in a variety of applications, including as refrigerants, blowing agents, aerosol propellants, gaseous dielectrics, and others. However, due to a series of environmental problems caused by the use of such substances, including relatively high ozone depletion value (ODP) and global warming potential value (GWP), most countries restrict production and use. [0003] 1,1,1,3,3-Pentafluoropropane has zero ozone depletion value and low global warming potential. It is a hydrofluorocarbon developed in recent years. It is used in blowing agents, solvents, aerosols and Refrigeration equipment and other fields have broad application prospects. Due to its good thermophysical properties, 1,1,1,3,3-pentafluoropropane also has many applications in he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/10C07C17/20
Inventor 陈欣周黎旸杨仲苗周强贺辉龙雷俊
Owner JUHUA GROUP TECH CENT