Purification process of monofluoromethane

A monofluoromethane and process technology, which is applied in the field of monofluoromethane purification process, can solve the problems of easy failure of adsorbent after repeated activation, easy saturation of adsorbent, and unqualified products, so as to maintain stable quality, reduce purification pressure, and ensure The effect of stability

Active Publication Date: 2019-01-22
FOSHAN HUATE GASES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Both of the above two patented technologies use adsorption to remove impurities, and the adsorbent is easily saturated, resulting in unqualified products, and the adsorbent is prone to failure after repeated activation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A kind of monofluoromethane purification process of the present embodiment, comprises the following steps:

[0064] (1), preliminary adsorption: make the monofluoromethane to be purified pass through activated alumina, 5A molecular sieve and 3A molecular sieve successively to carry out preliminary removal of impurities;

[0065] (2), feed and purification: rectifying tower comprises two rectifying tower A and rectifying tower B,

[0066] a. The monofluoromethane to be purified after preliminary adsorption enters the rectification tower A that has been cooled, and rectifies under the conditions of operating pressure of 0.5-0.6Mpa and temperature of -38°C--40°C, and 0.1-0.13kg / h speed discharges the crude product containing light components from the tower top gas phase of rectifying tower A, stops discharging until the light component content in the gas phase detects qualified, and the light components in the monofluoromethane to be purified include carbon dioxide;

[0...

Embodiment 2

[0070] A kind of monofluoromethane purification process of the present embodiment is basically the same as that of embodiment 1, the difference is that in step (2) a, the rectifying tower A is operated at a pressure of 0.6-0.7Mpa and a temperature of -30°C--35°C Carry out rectification under the condition of rectifying tower A with 0.15-0.0.18kg / h speed discharge the crude product containing light components from the tower top gas phase of rectifying tower A; Step (2) b, material in rectifying tower A is with 4kg The / h speed gas phase presses material to rectifying tower B, and stops pressing when the remaining 1 / 10 of the total mass of the substance in rectifying tower A.

Embodiment 3

[0072] A kind of monofluoromethane purification process of the present embodiment is basically the same as that of embodiment 1, the difference is that in step (2) a, the rectifying tower A is operated at a pressure of 0.7-0.8Mpa and a temperature of -20°C--25°C Carry out rectification under the condition of rectifying tower A with 0.18-0.2kg / h speed discharge the thick product containing light components from the tower top gas phase of rectifying tower A; Step (2) b, material in rectifying tower A is with 5kg / h The gas phase presses material to rectifying tower B at speed h, and stops pressing when the remaining total mass of the substance in rectifying tower A is 1 / 8.

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Abstract

The invention discloses a purification process of monofluoromethane, comprising the following steps: (1) preliminary adsorption: preliminarily removing impurities from monofluoromethane to be purifiedby an adsorbent; (2), feeding and purification: introducing the monofluoromethane to be purified, subjected to preliminary adsorption, into a cooled rectification column to remove light components inthe monofluoromethane to be purified, then discharging a material in the rectification column into a storage container, and remaining heavy components in the column, wherein the material put into thecontainer is monofluoromethane, and the purity is 4N-5N. According to the monofluoromethane purification process disclosed by the invention, preliminary adsorption by the adsorbent is performed, andthen rectification by the rectification column is performed; the purification process can reduce the purification pressure of the rectification column, ensure the stability of purification, and obtaina product with stable purity; moreover, even if the adsorbent is saturated and not replaced in time, the rectification column can trap impurities, so that the quality of a purified product remains stable.

Description

technical field [0001] The invention relates to the technical field of gas purification, in particular to a monofluoromethane purification process. Background technique [0002] Monofluoromethane, chemical formula CH3F, code name R41 or HFC-41, is a non-toxic, colorless, odorless, flammable liquefied gas stored in steel cylinders. Fluoromethane is used in the manufacturing process of semiconductors and electronic products, and it is also one of the ideal working fluids for low-temperature heat pumps. Fluoromethane has received more and more research and application. [0003] Patent 201610942390.3 discloses a method for preparing monofluoromethane. In the presence of a fluorination catalyst, monochloromethane (HCC-40) undergoes a gas-phase catalytic fluorination reaction with hydrogen fluoride. The product stream includes methane, monofluoromethane, and monochloromethane. , hydrogen fluoride and hydrogen chloride, obtain monofluoromethane by rectification, and described rect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/08C07C17/389C07C17/383
CPCC07C17/383C07C17/389C07C19/08
Inventor 杨俊豪何西陈艳珊卢建文韦杰广
Owner FOSHAN HUATE GASES
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