Halon purification method
There is provided a halon purification method capable of simply, safely, and efficiently removing mixed bromine molecules to obtain high purity halon. The halon purification method is a method for removing bromine molecules from crude halon containing halon and the bromine molecules, and the method includes: a contact step of bringing the crude halon into contact with an absorbing liquid containing an aqueous solution containing metal iodide to obtain a mixed liquid containing the crude halon and the absorbing liquid; and a separation step of separating the halon from the mixed liquid to obtain the halon and the absorbing liquid having absorbed the bromine molecules.
1 . A halon purification method for removing bromine molecules from crude halon containing halon and the bromine molecules, the method comprising:
a contact step of bringing the crude halon into contact with an absorbing liquid containing an aqueous solution containing metal iodide to obtain a mixed liquid containing the crude halon and the absorbing liquid; and
a separation step of separating the halon from the mixed liquid to obtain the halon and the absorbing liquid having absorbed the bromine molecules.
2 . The halon purification method according to claim 1 , wherein the metal iodide is at least one selected from alkali metal iodides and alkaline earth metal iodides.
3 . The halon purification method according to claim 1 , wherein the metal iodide is potassium iodide.
4 . The halon purification method according to claim 1 , wherein
the crude halon in a gaseous state is brought into contact with the absorbing liquid in the contact step, and
the halon in a gaseous state is extracted from the mixed liquid by gas-liquid extraction in the separation step.
5 . The halon purification method according to claim 1 , wherein a number of carbons of the halon is 1 or more and 3 or less.
6 . The halon purification method according to claim 1 , wherein a number of carbons of halon is 1 or 2.
7 . The halon purification method according to claim 1 , wherein the halon is at least one of bromomethane, tribromofluoromethane, bromodifluoromethane, dibromodifluoromethane, bromotrifluoromethane, bromoethane, dibromotrifluoroethane, dibromotetrafluoroethane, tribromotrifluoroethane, bromofluoroethylene, bromodifluoroethylene, and bromotrifluoroethylene.
8 . The halon purification method according to claim 1 , wherein the absorbing liquid further contains potassium iodate or sodium iodate.
9 . The halon purification method according to claim 2 , wherein
the crude halon in a gaseous state is brought into contact with the absorbing liquid in the contact step, and
the halon in a gaseous state is extracted from the mixed liquid by gas-liquid extraction in the separation step.
10 . The halon purification method according to claim 3 , wherein
the crude halon in a gaseous state is brought into contact with the absorbing liquid in the contact step, and
the halon in a gaseous state is extracted from the mixed liquid by gas-liquid extraction in the separation step.
11 . The halon purification method according to claim 2 , wherein a number of carbons of the halon is 1 or more and 3 or less.
12 . The halon purification method according to claim 3 , wherein a number of carbons of the halon is 1 or more and 3 or less.
13 . The halon purification method according to claim 4 , wherein a number of carbons of the halon is 1 or more and 3 or less.
14 . The halon purification method according to claim 2 , wherein a number of carbons of halon is 1 or 2.
15 . The halon purification method according to claim 3 , wherein a number of carbons of halon is 1 or 2.
16 . The halon purification method according to claim 4 , wherein a number of carbons of halon is 1 or 2.
17 . The halon purification method according to claim 2 , wherein the halon is at least one of bromomethane, tribromofluoromethane, bromodifluoromethane, dibromodifluoromethane, bromotrifluoromethane, bromoethane, dibromotrifluoroethane, dibromotetrafluoroethane, tribromotrifluoroethane, bromofluoroethylene, bromodifluoroethylene, and bromotrifluoroethylene.
18 . The halon purification method according to claim 3 , wherein the halon is at least one of bromomethane, tribromofluoromethane, bromodifluoromethane, dibromodifluoromethane, bromotrifluoromethane, bromoethane, dibromotrifluoroethane, dibromotetrafluoroethane, tribromotrifluoroethane, bromofluoroethylene, bromodifluoroethylene, and bromotrifluoroethylene.
19 . The halon purification method according to claim 4 , wherein the halon is at least one of bromomethane, tribromofluoromethane, bromodifluoromethane, dibromodifluoromethane, bromotrifluoromethane, bromoethane, dibromotrifluoroethane, dibromotetrafluoroethane, tribromotrifluoroethane, bromofluoroethylene, bromodifluoroethylene, and bromotrifluoroethylene.
20 . The halon purification method according to claim 2 , wherein the absorbing liquid further contains potassium iodate or sodium iodate.