公开(公告)号：US20200247735A1

公开(公告)日：2020-08-06

申请号：US16757501

申请日：2018-10-23

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Kazuhiro TAKAHASHI ,  Yuuko OHHIGASHI ,  Junpei IYOTA

IPC: C07C17/386

Abstract: By subjecting a starting material composition containing hexafluorobutadiene and at least one additional compound selected from the group consisting of octafluoro-1-butene, octafluoro-2-butene, heptafluoro-1-butene, and heptafluoro-2-butene to extractive distillation in the presence of an extraction solvent to reduce the concentration of the additional compound, hexafluorobutadiene with higher purity can be obtained.

公开(公告)号：US20230331647A1

公开(公告)日：2023-10-19

申请号：US18212281

申请日：2023-06-21

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Yuuko OHHIGASHI ,  Tatsuya TAKAKUWA ,  Kazuhiro TAKAHASHI

IPC: C07C17/383 ,  C07C19/08 ,  C09K5/04

CPC classification number: C07C17/383 ,  C07C19/08 ,  C09K5/04

Abstract: An object of the present invention is to provide a method that can efficiently remove water contained in pentafluoropropane. Provided as a solution is a method comprising distilling a composition comprising pentafluoropropane and water to thereby extract pentafluoropropane with a water content higher than that of the composition as a first stream, and pentafluoropropane with a water content lower than that of the composition as a second stream.

公开(公告)号：US20220177395A1

公开(公告)日：2022-06-09

申请号：US17677355

申请日：2022-02-22

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Yuuko OHHIGASHI ,  Tatsuya TAKAKUWA ,  Kazuhiro TAKAHASHI

IPC: C07C17/383 ,  C07C19/08 ,  C09K5/04

Abstract: An object of the present invention is to provide a method that can efficiently remove water contained in pentafluoropropane. Provided as a solution is a method comprising distilling a composition comprising pentafluoropropane and water to thereby extract pentafluoropropane with a water content higher than that of the composition as a first stream, and pentafluoropropane with a water content lower than that of the composition as a second stream.