Kaliprasanna Dhara

Title: Kaliprasanna Dhara: Innovator in Lignin Sulfonate Chemistry

Introduction

Kaliprasanna Dhara is a notable inventor based in West Bengal, India. He has made significant contributions to the field of chemistry, particularly in the area of lignin sulfonates. His innovative work has led to the development of a unique patent that showcases his expertise and creativity.

Latest Patents

Kaliprasanna Dhara holds a patent for "Alkylene oxide esters of lignin sulfonic acid." This invention involves converting lignin sulfonates into sulfonic acid esters by blocking free phenolic hydroxyl groups. The process includes subjecting the blocked lignin sulfonate in aqueous solution to ion exchange, producing the free sulfonic acid. The aqueous solvent is then exchanged for a polar organic solvent, such as isopropanol, where the sulfonic acid derivative reacts with an aliphatic epoxide. The resulting sulfonic acid ester adduct is soluble in various organic solvents and insoluble in water, making it a valuable compound in chemical applications.

Career Highlights

Kaliprasanna Dhara is associated with Virginia Tech Intellectual Properties, Inc., where he continues to advance his research and development efforts. His work has garnered attention for its innovative approach to utilizing lignin, a byproduct of the paper industry, in creating useful chemical compounds.

Collaborations

One of his notable collaborators is Wolfgang G. Glasser, with whom he has worked on various projects related to lignin chemistry. Their partnership has contributed to the advancement of knowledge in this specialized field.

Conclusion

Kaliprasanna Dhara's contributions to lignin sulfonate chemistry exemplify the innovative spirit of modern inventors. His patent on alkylene oxide esters of lignin sulfonic acid highlights the potential of lignin as a resource for creating valuable chemical products. His work continues to inspire future research and development in this area.