PURIFICATION OF TRIFLUOROMETHANE

Japanese Patent JP3856409

B2

PROBLEM TO BE SOLVED: To obtain the highly pure compound hardly containing impurities by industrially easily and profitably treating a crude trifluoromethane product containing compounds having chlorine and bromine as impurities by a specific purification method.
SOLUTION: This method for purifying trifluoromethane comprises reacting a crude trifluoromethane product containing compounds having chlorine and bromine as impurities with hydrogen fluoride in the presence of a fluorination catalyst (e.g. a carrier type catalyst mainly containing chromium) in a gas phase at an enhanced temperature to convert the chlorine and the bromine into hydrogen chloride and hydrogen bromide, and subsequently removing an acid content containing the hydrogen chloride and the hydrogen bromide preferably by a method for bringing the acid content into contact with a purifying agent to react the acid content with the purifying agent. The reaction of the crude product with the hydrogen fluoride is preferably carried out at 120-400°C at the atmospheric pressure to 1.5 MPa. The purifying agent preferably comprises quick lime, sodium aluminate, etc., or a carbonaceous solid material such as activated carbon.

JPH0777614	INDUSTRIAL APPLICABILITY: A catalyst for lightening heavy oil and a method for lightening using the catalyst.
JP2007246506	PRODUCTION METHOD OF CYCLOBUTALENE
JPS5830336	ZINC CONTAINING ALUMINUM SILICATE CATALYST AND PRODUCTION AND USE THEREOF

Hiroki Ohno
Tetsuo Nakajo
Toshio Oi
Arai Ryuharu

JP11832297A

December 13, 2006

May 08, 1997

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SHOWA DENKO K.K.

B01J23/06; C07C17/42; B01J23/26; B01J23/755; C07C17/395; C07C19/08; (IPC1-7): C07C19/08; B01J23/06; B01J23/26; B01J23/755; C07C17/395; C07C17/42

JP39021825B1
JP42003004B1
JP49043922B1
JP49000164B1
JP60019733A

Teruo Akimoto

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