Preparation method for heptafluoropropane through gas phase catalysis fluorination

A technology of heptafluoropropane and heptachloropropane, which is applied in the field of preparing heptafluoropropane gas by a method of fluorine and chlorine replacement, which can solve the problems of restricted places and scope of use, strong corrosion of glassware and precision instruments, etc., and achieve low production costs and lower prices , the effect of simple steps

Inactive Publication Date: 2012-08-01
张超智
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  • Claims
  • Application Information

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Problems solved by technology

However, during use, it was found that under high temperature conditions at the fire site, hexafluoropropane cracked harmful substances, mainly hydrofluoric acid (HF), which has a strong corrosive effect on glassware and precision instruments
Therefore, due to its inherent disadvantages, the hexafluoropropane fire extinguishing agent greatly limits the place and scope of its use, and can only be used as a "transitional" fire extinguishing agent

Method used

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  • Preparation method for heptafluoropropane through gas phase catalysis fluorination
  • Preparation method for heptafluoropropane through gas phase catalysis fluorination
  • Preparation method for heptafluoropropane through gas phase catalysis fluorination

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preparation Embodiment 1

[0022] Activated carbon pretreatment: Pour 150 g of activated carbon particles with a diameter of 2-4mm into 1000 mL of 36.5wt% concentrated hydrochloric acid and 40wt% hydrofluoric acid aqueous solution, stir at room temperature for 24 hours, filter, wash with water until neutral, 120 ℃ for 10 hours, 300 ℃ for 5 hours, and then used as a catalyst carrier.

[0023] 5 g CrCl 3 and 0.5g LaF 3 Dissolve in 50 mL water to make a solution, weigh 44.5 g of the above activated carbon and pour it into CrCl 3 solution, stirred for 3 hours. 120 o C dried for 5 hours and dried at 300°C for 5 hours to obtain 10 wt% CrCl 3 / 1wt%LaF 3 / C catalyst, denoted as Cat-1.

preparation Embodiment 2

[0025] Take 5g Cr 2 o 3 , 0.25g LaF 3 And the activated carbon after the above-mentioned pretreatment of 44.75g, prepare 10wt%Cr in the same way as Example 1 2 o 3 / 0.5wt%LaF 3 / C and recorded as Cat-2, the difference is the use of Cr 2 o 3 Instead of CrCl 3 .

preparation Embodiment 3

[0027] Take 5g CrBr 3 , 0.05g LaF 3 And the activated carbon after the above-mentioned pretreatment of 44.95g, prepare 10wt%CrBr in the same way as Example 1 3 / 0.1wt%LaF 3 / C and denoted as Cat-3, the difference is the use of CrBr 3 Instead of CrCl 3 .

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Abstract

The invention discloses a preparation method for heptafluoropropane, which includes the following steps: gasifying 1,1,1,2,3,3,3-heptachloropropane and anhydrous hydrofluoric acid, mixing, preheating, reacting through a tubular fixed bed reactor with catalyst, rectifying, and obtaining the heptafluoropropane. Reaction temperature is 300-420 DEG C, reaction pressure is 2atm-40atm, and time for gas raw materials to pass through the surface of catalyst is 10-35 seconds. Molar ratio of 1,1,1,2,3,3,3-heptachloropropane to anhydrous hydrofluoric acid is 1:5-1:12. The catalyst is compound salt of chromium salt and rare earth compound La3F3, and aluminum oxide, zinc oxide, nickel oxide or activated carbon are used as carriers. The preparation method for the heptafluoropropane is low in cost and high in production rate.

Description

technical field [0001] The invention relates to a method for preparing heptafluoropropane, in particular to a method for preparing heptafluoropropane gas by replacing chlorine with fluorine. Background technique [0002] With the gradual strengthening of environmental protection awareness, the impact of the gas released by the fire extinguishing system on the atmosphere has attracted more and more people's attention. After the traditional halogenated alkanes are released, the residual time of the gas in the atmosphere can reach nearly a hundred years, which is harmful to the environment. Great impact. In order to protect the ozone layer of the atmosphere, according to the relevant provisions of international conventions, the production of this type of fire extinguishing agent has been banned since the end of 1993, and the use of this type of product has been banned worldwide since 2005. For example: Halon (Halon) fire extinguishing agent has excellent properties such as lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/20
Inventor 张超智
Owner 张超智
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