Sumio Otsuka

Title: Sumio Otsuka: Innovator in Chemical Processes

Introduction

Sumio Otsuka is a notable inventor based in Takamatsu, Japan. He has made significant contributions to the field of chemistry, particularly in the preparation of specialized chemical compounds. With a total of two patents to his name, Otsuka's work has implications in various industrial applications.

Latest Patents

Otsuka's latest patents focus on the preparation of 5,5'-bi-1H-tetrazole salts. The first patent describes a process for creating a 5,5'-bi-1H-tetrazole diammonium salt through a one-pot reaction. This method involves the careful addition of aqueous hydrogen peroxide to a solution containing hydrogen cyanide or its sodium and potassium salts, along with sodium azide and copper sulfate. The reaction is conducted at low temperatures to maintain a pH between 5 and 6, leading to high yields and purity of the desired product. The second patent outlines a method for preparing the same diammonium salt using dicyan, sodium azide, and ammonium chloride in water. This process is advantageous for its simplicity and efficiency, yielding over 90% of the desired product, which serves as a low-toxicity gas-generating agent for air bags.

Career Highlights

Throughout his career, Sumio Otsuka has worked with reputable companies such as Japan Hydrazine Co., Ltd. and Masuda Chemical Industry Co., Ltd. His experience in these organizations has contributed to his expertise in chemical processes and innovations.

Collaborations

Otsuka has collaborated with notable coworkers, including Shunji Hyoda and Masaharu Kita. Their collective efforts have further advanced the field of chemical engineering and innovation.

Conclusion

Sumio Otsuka's contributions to the preparation of 5,5'-bi-1H-tetrazole salts highlight his innovative spirit and dedication to advancing chemical processes. His work not only enhances industrial applications but also demonstrates the importance of efficiency and safety in chemical manufacturing.