Preparation process of octafluoropropane

A preparation process and octafluoropropane technology, applied in the field of preparation technology of octafluoropropane, can solve the problems of increasing the amount of three wastes, increasing the reaction equipment, etc., so as to reduce the generation of short-chain perfluoroalkane by-products, the reaction is sufficient, and the fracture is reduced. Effect

Inactive Publication Date: 2019-10-25
FUJIAN DEER TECH CORP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The disadvantage of this method is that the process requires a two-step reaction, the reaction equipment increases accordingly, and the amount of three wastes generated in the process increases accordingly

Method used

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  • Preparation process of octafluoropropane
  • Preparation process of octafluoropropane
  • Preparation process of octafluoropropane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: the impact of fluorine gas concentration on product components

[0048] The operating conditions are as follows: the reaction temperature is 35-55°C, the pressure is 0 MPa, and the molar ratio of fluorine gas to HFP is about 1.25:1. Reaction product composition, reaction conversion and selectivity results such as image 3 shown. Among them, R218 in Figure 3(a) is octafluoropropane, R116 is perfluoroethane, and HFP is hexafluoropropylene.

[0049] From image 3 According to the experimental results, under a certain material ratio, the reaction conversion rate is not greatly affected by the concentration of fluorine gas. When the concentration of fluorine gas is 15% and 20%, the conversion rate reaches or approaches 100%, while when the concentration of fluorine gas is 10%, the conversion rate is about 95%. The possible reason is that when the concentration of fluorine gas is too low, the content of nitrogen gas is too high, which leads to insufficient c...

Embodiment 2

[0050] Embodiment 2: the influence of reaction mass ratio on fluorination reaction

[0051] 20% fluorine-nitrogen mixed gas and 99.9% HFP are used to react at a temperature of 2-30° C. and a pressure of nearly 0.0 MPa. The molar ratio of fluorine gas to HFP is respectively 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1.0:1, 1.1:1, 1.2:1, 1.4:1, 2.0:1, 2.4:1 and 3.7: 1. The experimental results such as product composition, reaction conversion rate and selectivity are as follows: Figure 4 shown.

[0052] It can be seen from the experimental results that the material ratio has an influence on the reaction conversion rate and R218 selectivity. The reaction conversion rate increases with the increase of the molar ratio of fluorine gas to HFP. This phenomenon is particularly obvious when the molar ratio of fluorine gas to HFP is in the range of 0.5-1.2, that is, the reaction conversion rate increases obviously with the increase of the molar ratio of fluorine gas to HFP. When the molar ratio of...

Embodiment 3

[0055] Embodiment 3: the influence of reaction temperature on fluorination reaction

[0056] 20% fluorine-nitrogen mixed gas and 99.9% HFP are used, the molar ratio of fluorine gas to HFP is about 1.2:1, and the reaction is carried out at a pressure of nearly 0.0 MPa. The reaction temperatures are respectively 2°C, 4°C, 40°C, 60°C, 70°C, 130°C, 135°C and 140°C. The experimental results such as product composition, reaction conversion rate and selectivity are as follows: Figure 5 shown.

[0057] It can be seen from the experimental results that the reaction temperature has little effect on the conversion rate of HFP fluorination reaction and the selectivity of R218 within the range of 0-100 °C. When the temperature is higher than 100°C, the reaction conversion remains at about 100%, but the selectivity of R218 decreases, mainly because the amount of R116 increases rapidly with the increase of temperature, that is, more carbon chain breaks occur Case. We believe that when t...

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Abstract

The invention discloses a preparation process of octafluoropropane. The preparation process includes a fluorination reaction section, in the fluorination reaction section, hexafluoropropylene and fluorine nitrogen mixed gases enter a tubular reactor in the form of a parallel flow, and a continuous flow gas-phase reaction is carried out under a certain temperature and pressure to generate the octafluoropropane, and at least one static mixer is installed in the tubular reactor. The preparation process has the advantages of simple process, high reaction efficiency, less by-products and high product purity.

Description

technical field [0001] The invention belongs to the technical field of producing octafluoropropane, and in particular relates to a preparation process of octafluoropropane. Background technique [0002] Octafluoropropane, also known as perfluoropropane, R218 and Flutec PP30, is a halogenated hydrocarbon (molecular formula is CF 3 CF 2 CF 3 ) has high chemical stability, thermal stability, non-combustibility and high physiological drug resistance. At present, octafluoropropane has been used more and more in industries such as medicine, refrigeration and the semiconductor industry, especially, as a plasma etching material in the semiconductor industry. With the vigorous development of semiconductors, solar energy and LEDs, the market Demand for high-purity octafluoropropane is on the rise. [0003] In existing literature reports, the synthesis methods of octafluoropropane mainly include: (1) direct fluorination reaction of fluorine gas and activated carbon; (2) electrochem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/04C07C19/08B01D3/14B01F5/06B01F13/10B01J19/24
CPCC07C17/04B01J19/2415B01D3/14B01F25/42B01F33/811C07C19/08
Inventor 张林溪张奎黄天梁
Owner FUJIAN DEER TECH CORP
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