Preparation method of perfluoropropane

A technology for octafluoropropane and hexafluoropropene, which is applied in the field of preparation of octafluoropropane, can solve the problems of cumbersome process, pulverization of fluorinating agent, complicated operation and the like, and achieves the effects of simple process, reduced production cost and low reaction temperature

Inactive Publication Date: 2018-01-05
SHANGHAI HELI IND GAS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is divided into two steps, first cobalt difluoride is fluorinated into cobalt trifluoride, and then reacted with hexafluoropropylene, which requires two reactors in continuous production, one for fluorination and one for reaction, which makes the process relatively It is cumbersome and complicated to operate; in addition, in the producti

Method used

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  • Preparation method of perfluoropropane
  • Preparation method of perfluoropropane

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Put the cobalt-based catalyst into the reactor (dimensions ￠57×3.5×560), then heat the reactor, use nitrogen to purge the reaction device during the temperature rise, and after the internal temperature of the reactor rises to 280°C and the temperature is stable, the raw material Mixed gas (diluted fluorine gas with a concentration of 20% fluorine gas, nitrogen gas as the diluent gas, molar ratio of hexafluoropropylene to dilute fluorine gas is 1:6) with 0.16Nm 3 The flow rate of / h is passed into the reactor for reaction, and the mixed gas obtained by the reaction is sequentially passed into the alkali washing tower using potassium hydroxide and the adsorbent adopts the adsorber of activated alumina for treatment, and then enters the rectification system for purification to obtain high-purity Octafluoropropane, and the separated nitrogen can be used as the purge gas before the reaction of the reactor.

Embodiment 2

[0039] In this example, the fluorine concentration in the diluted fluorine gas is 30%, the molar ratio of hexafluoropropylene to the diluted fluorine gas is 1:4, the reaction temperature is set at 300°C, and the implementation steps and parameters are the same as in Example 1 .

Embodiment 3

[0041]In this example, the fluorine concentration in the diluted fluorine gas is 40%, the molar ratio of hexafluoropropylene to the diluted fluorine gas is 1:3, the reaction temperature is set at 300°C, and the implementation steps and parameters are the same as in Example 1 .

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Abstract

The invention discloses a preparation method of perfluoropropane. The preparation method comprises following steps: S1, hexafluoropropene and diluted fluorine gas are uniformly mixed at a certain molar ratio so as to obtain a mixed raw material gas; S2, the mixed raw material gas is delivered into a fixed bed reactor containing a cobalt catalyst at an appropriate temperature under appropriate pressure conditions for reaction so as to obtain a mixed gas containing perfluoropropane; S3, the mixed gas containing perfluoropropane is delivered into an alkaline washing tower and an absorber successively for treatment so as to remove a trace of fluorine gas, hydrogen fluoride, and water, and obtain crude perfluoropropane; and S4, the crude perfluoropropane is delivered into a rectification systemfor further refining so as to obtain high purity perfluoropropane. The beneficial effects are that: hexafluoropropene is taken as a preparation raw material, perfluoropropane is prepared via additionreaction of hexafluoropropene with diluted fluorine gas under the action of the cobalt catalyst, the raw material conversion rate is high, yield is high, selectivity is high, the preparation method is simple, production cost is low, operation is convenient, reaction temperature is low, and energy consumption is low.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing octafluoropropane with high raw material conversion rate, high yield, low cost and simple process. Background technique [0002] Octafluoropropane, also known as perfluoropropane, was first prepared in 1937 by American chemists Simons and Block by reacting fluorine gas and carbon in the presence of a catalyst. Octafluoropropane is currently a widely used fluorocarbon gas. It is often used as an etching or cleaning gas in the semiconductor device production process in the semiconductor industry. It can also be used as an ultrasound contrast agent in the medical industry. In addition, it is often used in other industries. One of the components of the refrigerant mixture. [0003] Regarding the preparation of octafluoropropane, the current main synthetic routes include direct gas-phase fluorination of hydrocarbons (patent US5406008), electrolytic fluorination...

Claims

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Application Information

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IPC IPC(8): C07C17/04C07C19/08
Inventor 梁成科
Owner SHANGHAI HELI IND GAS CO LTD
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