公开(公告)号：US20200095132A1

公开(公告)日：2020-03-26

申请号：US16612480

申请日：2018-04-25

Applicant: SHOWA DENKO K.K.

Inventor： Yohsuke FUKUCHI ,  Atsushi NAKAMURA ,  Nozomi INOUE ,  Mitsuhiro HINO ,  Tomoki SEKIGUCHI

IPC: C01G9/04

Abstract: Provided is a method for producing a highly pure aqueous solution of zinc halide from a mixture containing a zinc halide. The method for producing an aqueous solution of zinc halide includes an addition step of adding water and a hydrogen halide to a mixture containing an alcohol having a carbon number of 3 or less, a zinc halide, and zinc to give a liquid mixture, and a distillation step of distilling the liquid mixture to remove the alcohol having a carbon number of 3 or less from the liquid mixture, giving an aqueous solution of zinc halide.

公开(公告)号：US20210163382A1

公开(公告)日：2021-06-03

申请号：US16611879

申请日：2018-04-25

Applicant: SHOWA DENKO K.K.

Inventor： Yohsuke FUKUCHI ,  Atsushi NAKAMURA ,  Nozomi INOUE ,  Mitsuhiro HINO ,  Tomoki SEKIGUCHI

IPC: C07C17/23 ,  C07C17/383

Abstract: Provided is a method that is for producing hexafluoro-1,3-butadiene, discharges small amounts of industrial wastes, and is industrially applicable. The method for producing hexafluoro-1,3-butadiene includes a reaction step of reacting a halogenated butane represented by chemical formula, CF2X1-CFX2-CFX3-CF2X4 (X1, X2, X3, and X4 are each independently a halogen atom other than a fluorine atom) in an organic solvent in the presence of zinc to eliminate the halogen atoms, X1, X2, X3, and X4, other than the fluorine atoms to generate hexafluoro-1,3-butadiene, giving a reaction product containing the hexafluoro-1,3-butadiene, and an aftertreatment step of separating the hexafluoro-1,3-butadiene from the reaction product produced in the reaction step, then adding water to a reaction product residue after the separating, and removing the organic solvent, giving an aqueous solution of zinc halide.