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Preparation method of heptafluoropropane

A technology for heptafluoropropane and heptachloropropane, which is applied in the field of heptafluoropropane gas preparation by a method of fluorine and chlorine replacement, can solve the problems of strong corrosion of glassware and precision instruments, restricted places and ranges of use, etc., and achieves low production cost and high production cost. The effect of lowering and lowering prices

Inactive Publication Date: 2013-12-18
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • 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 of heptafluoropropane
  • Preparation method of heptafluoropropane

Examples

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Effect test

Embodiment 1

[0017] Heat and vaporize 1,1,1,2,3,3,3-heptachloropropane, then mix 1,1,1,2,3,3,3-heptachloropropane gas with hydrogen fluoride gas (according to the molar ratio of 1: 5) into a fixed-bed reactor equipped with a catalyst (chromium trichloride supported on aluminum oxide, purchased from Nanhua Research Institute), at 30 atmospheres, at a temperature of 230 ° C, the time for passing the catalyst is 9 seconds, 1,1,1,2,3,3,3-heptafluoropropane was separated by rectification, and 1,1,1,2,3,3,3-heptachloropropane was converted into 1,1,1,2 , The single conversion rate of 3,3,3-heptafluoropropane is 46%.

Embodiment 2-9

[0019] Heat and vaporize 1,1,1,2,3,3,3-heptachloropropane, then mix 1,1,1,2,3,3,3-heptachloropropane gas with hydrogen fluoride gas (according to the molar ratio of 1: 5) into a fixed-bed reactor equipped with a catalyst (chromium trichloride supported on aluminum oxide, purchased from Nanhua Research Institute), and rectified to separate 1,1,1,2,3,3, 3-Heptafluoropropane. Wherein reaction temperature, pressure, feed gas pass through catalyst time and gained productive rate are shown in the following table:

[0020] Example 2 3 4 5 6 7 8 9 temperature / ℃ 320 380 230 320 380 230 320 380 pressure / atm 30 30 10 10 10 2 2 2 time / second 9 9 40 22 15 40 15 9 Yield / % 45 47 46 47 48 47 48 46

Embodiment 10

[0022] Heat and vaporize 1,1,1,2,3,3,3-heptachloropropane, then mix 1,1,1,2,3,3,3-heptachloropropane gas with hydrogen fluoride gas (according to the molar ratio of 1: 6) Into a fixed-bed reactor equipped with a catalyst (chromium trifluoride supported on aluminum oxide, purchased from Nanhua Research Institute), at 30 atmospheres, at a temperature of 230°C, the time for passing the catalyst is 9 seconds, 1,1,1,2,3,3,3-heptafluoropropane was separated by rectification, and 1,1,1,2,3,3,3-heptachloropropane was converted into 1,1,1,2 , The single conversion rate of 3,3,3-heptafluoropropane is 47%.

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Abstract

The invention discloses a preparation method of heptafluoropropane, which comprises the following steps: mixing 1,1,1,2,3,3,3-heptachloropropane and gasified anhydrous hydrofluoric acid, preheating, reacting in a catalyst-filled tubular fixed bed reactor, and rectifying to obtain heptafluoropropane, wherein the reaction temperature is 230-380 DEG C, the reaction pressure is 2-30atm, and the time of the gas raw material passing through the catalyst surface is 9-40 seconds; the mol ratio of the 1,1,1,2,3,3,3-heptachloropropane to the anhydrous hydrofluoric acid is 1:5-1:10; and the catalyst is a transition metal salt, aluminum oxide or activated carbon is used as a support. The preparation method of heptafluoropropane has the advantages of simple steps and low production cost.

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 Patents(China)
IPC IPC(8): C07C19/08C07C17/35
Inventor 张超智
Owner NANJING UNIV OF INFORMATION SCI & TECH
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