Sadaharu Mishumi

Title: Sadaharu Mishumi: Innovator in Refrigerant Technology

Introduction

Sadaharu Mishumi is a notable inventor based in Kawagoe, Japan. He has made significant contributions to the field of refrigerant technology, particularly through his innovative methods of preparing specific chemical compounds.

Latest Patents

Mishumi holds a patent for a method of preparing 1,1,1,2-tetrafluoroethane, a refrigerant. This process minimizes the formation of isomers or chlorofluoroethanes that have similar boiling points. The method involves reacting 1,1-dichloro-1,2,2,2-tetrafluoroethane (R-114a), which may contain up to about 25 wt% of 1,2-dichloro-1,1,2,2-tetrafluoroethane (R-114), with hydrogen gas. This reaction occurs in the presence of a palladium-on-active alumina catalyst at temperatures ranging from 120°C to below 200°C. The result is R-114a that is almost free of R-114.

Career Highlights

Mishumi is associated with Central Glass Company, Limited, where he has been able to apply his expertise in chemical engineering and innovation. His work has contributed to advancements in the production of environmentally friendly refrigerants.

Collaborations

Mishumi has collaborated with notable colleagues, including Hideki Oshio and Kiyoshi Yagii. These partnerships have fostered a collaborative environment that encourages innovation and the development of new technologies.

Conclusion

Sadaharu Mishumi's contributions to refrigerant technology exemplify the impact of innovative thinking in the chemical industry. His patent for the preparation of 1,1,1,2-tetrafluoroethane showcases his commitment to developing efficient and environmentally friendly solutions.