Francis Loiseau

Title: Francis Loiseau and Sulfonated Lignin-Based Compositions.

Introduction

Francis Loiseau is an inventor associated with Saint-Hubert, Canada, and Rg Dispersants Ltd. His work includes a patented process for preparing sulfonated lignin-based compositions, materials that can serve as dispersants in a range of industrial and agricultural applications.

Latest Patents

The supplied information identifies one patent associated with Loiseau: “Process of Making Sulfonated Lignin-Based Compositions, Sulfonated Lignin-Based Compositions So-Obtained and Their Use.” The process begins by mixing lignin with water to form an aqueous suspension with a solids content of up to about 45 percent by weight and a pH greater than about 6. The suspension is heated to between about 65°C and 160°C, then sulfonated using an agent that generates sulfite ions, bisulfite ions, or both. Sulfonation takes place at about 90°C to 160°C, at a pH of about 6 to 11, and within a specified ratio of sulfonating agent to lignin. The resulting mixture is then cooled.

The sulfonated lignin can be used in an aqueous mixture or as a powder. Potential applications include concrete, grout, mortar, oil-well cement, cement board, gypsum wallboard, agricultural products, drilling fluids, and coal slurries. The record provided lists 1 patent for Loiseau.

Career Highlights

Loiseau’s listed patent reflects work on processing lignin into sulfonated compositions with potential dispersant uses. The invention describes preparation conditions for producing the compositions and identifies several sectors where they may be applied. The supplied information associates him with Rg Dispersants Ltd.

Collaborations

The supplied information names Mario Dupuis and Iordana Triantafillu as Loiseau’s coworkers. Their inclusion indicates professional connections, though no specific roles or contributions to the patent are provided.

Conclusion

Francis Loiseau’s listed invention focuses on a controlled process for producing sulfonated lignin-based compositions and describes their potential use as dispersants across industrial and agricultural applications.