Method for purifying fluid that includes trifluoroethylene, and method for producing trifluoroethylene
To provide a method for purifying trifluoroethylene, by which from a fluid containing trifluoroethylene, a C 1-5 alkane or alkene (excluding trifluoroethylene) in which at least one hydrogen atom may be substituted with a chlorine atom or a fluorine atom can be efficiently removed, and a method for producing trifluoroethylene by which trifluoroethylene can be efficiently produced. A fluid containing trifluoroethylene is brought into contact with at least one type of synthetic zeolite selected from synthetic zeolites 3A, 4A and 5A.
1. A method for producing trifluoroethylene, the method comprising:
bringing a fluid comprising trifluoroethylene and (E)-1,2-difluoroethylene into contact with at least one synthetic zeolite selected from the group consisting of synthetic zeolites 4A and 5A such that (E)-1,2-difluoroethylene is adsorbed in the at least one synthetic zeolite.
2. The method according to claim 1 , further comprising:
reducing chlorotrifluoroethylene with hydrogen gas in the presence of a catalyst to produce the fluid before the fluid is brought into contact with the at least one synthetic zeolite.
3. The method according to claim 1 , further comprising:
subjecting a composition comprising chlorodifluoromethane and/or tetrafluoroethylene and chlorofluoromethane to a synthetic reaction involving heat decomposition in the presence of a heating fluid to produce the fluid before the fluid is brought into contact with the at least one synthetic zeolite.
4. The method according to claim 1 , further comprising:
subjecting 1,1,1,2-tetrafluoroethane to dehydrofluorination in the presence of an alkali metal and/or an alkaline earth metal to produce the fluid before the fluid is brought into contact with the at least one synthetic zeolite.
5. The method according to claim 1 , wherein the synthetic zeolite is subjected to a heat treatment by a dry gas of from 100 to 400° C. or subjected to a heat treatment under reduced pressure before the fluid is brought into contact with the at least one synthetic zeolite.
6. A method for producing trifluoroethylene, the method comprising:
bringing a fluid comprising trifluoroethylene, (E)-1,2-difluoroethylene and water, into contact with synthetic zeolites 3A such that (E)-1,2-difluoroethylene and water are adsorbed in the synthetic zeolite 3A.
7. The method according to claim 6 , further comprising:
reducing chlorotrifluoroethylene with hydrogen gas in the presence of a catalyst to produce the fluid before the fluid is brought into contact with the synthetic zeolite 3A.
8. The method according to claim 6 , further comprising:
subjecting a composition comprising chlorodifluoromethane and/or tetrafluoroethylene and chlorofluoromethane to a synthetic reaction involving heat decomposition in the presence of a heating fluid to produce the fluid before the fluid is brought into contact with the synthetic zeolite 3A.
9. The method according to claim 6 , further comprising:
subjecting 1,1,1,2-tetrafluoroethane to dehydrofluorination in the presence of an alkali metal and/or an alkaline earth metal to produce the fluid before the fluid is brought into contact with the synthetic zeolite 3A.
10. The method according to claim 6 , wherein the synthetic zeolite is subjected to a heat treatment by a dry gas of from 100 to 400° C. or subjected to a heat treatment under reduced pressure before the fluid is brought into contact with the synthetic zeolite 3A.