Makoto Yasui

Title: The Innovations of Makoto Yasui

Introduction

Makoto Yasui is a prominent inventor based in Yokohama, Japan. He has made significant contributions to the field of chemical engineering, particularly in the production of bisphenol A. With a total of 6 patents to his name, Yasui's work has had a substantial impact on the industry.

Latest Patents

Yasui's latest patents focus on innovative processes for the production of bisphenol A. One of his notable patents describes a method for producing high-quality bisphenol A with excellent purity and hue. This process involves washing a crystalline adduct of bisphenol A and phenol with specifically purified phenol, followed by the decomposition of the washed adduct to separate bisphenol A. The purification method includes contacting raw material phenol with a strong-acid ion exchange resin to obtain treated phenol, which is then distilled.

Another significant patent outlines a process for producing bisphenol A from a neutral crystalline adduct of bisphenol A and phenol. This method involves fusing the adduct in an atmosphere with a maximum oxygen content of 0.005% by volume, followed by the evaporation of liberated phenol. To enhance the quality of the product, the crystalline adduct may be mixed with an aliphatic carboxylic acid before fusion. The evaporation process is performed using a two-stage steam stripping method, ensuring optimal results.

Career Highlights

Makoto Yasui is currently employed at Chiyoda Corporation, where he continues to innovate and develop new processes in chemical production. His expertise in bisphenol A production has positioned him as a key figure in the industry.

Collaborations

Yasui has collaborated with notable coworkers such as Sachio Asaoka and Kouji Sakashita. Their combined efforts have contributed to advancements in chemical engineering and production techniques.

Conclusion

Makoto Yasui's contributions to the field of chemical engineering, particularly in the production of bisphenol A, highlight his innovative spirit and dedication to advancing industry standards. His patents reflect a commitment to quality and efficiency in chemical processes.