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Method for preparing fluoromethane

A monofluoromethane and catalyst technology, applied in the field of preparation of monofluoromethane, can solve the problems of difficulty in industrialization, high production cost, unsatisfactory catalyst life, etc.

Inactive Publication Date: 2014-09-03
SINOCHEM LANTIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple and convenient, the use of carbon nanotubes as a catalyst carrier has high production costs and unsatisfactory catalyst life, making it difficult to realize industrialization

Method used

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  • Method for preparing fluoromethane
  • Method for preparing fluoromethane
  • Method for preparing fluoromethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 1g of Pd / AC (Pd mass content 2%) catalyst into the gas-phase catalytic hydrodechlorination reaction device, H 2 In the atmosphere, the temperature was raised from room temperature to 350°C over 2h, and the online reduction was carried out at 350°C for 2h. Then lower the temperature to 250°C, switch to reaction gas, at the volume ratio H 2 :CFC-11=4:1 (total flow rate 10ml / min), normal pressure reaction.

Embodiment 2

[0023] Add 1g of Pd / AC (Pd mass content 2%) catalyst into the gas-phase catalytic hydrodechlorination reaction device, H 2 In the atmosphere, the temperature was raised from room temperature to 350°C over 2h, and the online reduction was carried out at 350°C for 2h. Then lower the temperature to 250°C, switch to reaction gas, at the volume ratio H 2 :HCFC-21=4:1 (total flow rate 10ml / min), normal pressure reaction.

Embodiment 3

[0025] Add 1g of Pd / AC (Pd mass content 2%) catalyst into the gas-phase catalytic hydrodechlorination reaction device, H 2 In the atmosphere, the temperature was raised from room temperature to 350°C over 2h, and the online reduction was carried out at 350°C for 2h. Then lower the temperature to 250°C, switch to reaction gas, at the volume ratio H 2 : HCFC-31=4:1 (total flow rate 10ml / min), normal pressure reaction.

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PUM

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Abstract

The invention provides a method for preparing fluoromethane. In the presence of a catalyst, CHxClyF (x is equal to 0, 1 and 2, and y is equal to 3, 2 and 1) and hydrogen are subjected to hydrodechlorination reaction so as to generate HFC-41, the catalyst is selected from a self-loaded type Ni catalyst, a loaded type Pd catalyst, a loaded type Pt catalyst, a loaded type Rh catalyst or a metal carbide catalyst, and the metal carbide catalyst is selected from Mo2C, WC or W2C. The method provided by the invention is simple in process route, safe in production and environmentally friendly.

Description

technical field [0001] The present invention relates to a method for preparing monofluoromethane. Background technique [0002] Fluoromethane (HFC-41 for short) is a non-toxic and liquefiable gas at normal temperature and pressure. It can be used as a selective fluoromethylation reagent for organic molecules in organic synthesis and drug synthesis. At the same time, HFC-41 is also used as It is used as raw material for the production of bromofluoromethane, an important pesticide intermediate. High-purity HFC-41 gas is a green, high-efficiency new etching gas (ODP value 0, GWP value 97), which can be used for etching semiconductor and electronic products, such as selectively etching silicon compound films. The reports of the prior art for HFC-41 are as follows: [0003] JP-4-7330 reported the use of chromium fluoride catalyst to make methanol and hydrogen fluoride undergo gas-phase fluorination to prepare HFC-41. This method has problems such as low conversion rate of metha...

Claims

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Application Information

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IPC IPC(8): C07C19/08C07C17/23
Inventor 刘武灿张金柯金佳敏杨箭
Owner SINOCHEM LANTIAN
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