John David Withenshaw

Title: John David Withenshaw: Innovator in Alkaline Bleaching Technologies

Introduction

John David Withenshaw is an accomplished inventor based in Clwyd, GB, with a notable portfolio comprising four patents. His work primarily focuses on innovations in the field of pulp bleaching, employing advanced methodologies that enhance the efficiency and effectiveness of the bleaching process.

Latest Patents

Among his latest patents is a groundbreaking method for the alkaline bleaching of pulp utilizing a peroxyacid-based oxygen bleaching species combined with an agglomerated bleach activator. This innovative process involves the addition of a carefully formulated agglomerate to a dilute solution of hydrogen peroxide. The agglomerate consists of essential components, including the bleach activator tetraacetyl ethylene diamine (TAED) and a peroxide-soluble binder like polyvinyl alcohol (PVOH).

The methodology includes agitating the solution to keep the agglomerate suspended, allowing for a complete reaction of TAED with hydrogen peroxide. The pH of the bleach solution is then adjusted using caustic soda, followed by the bleaching of wood and non-wood pulp under alkaline conditions. This process promises to offer significant advancements in pulp bleaching, making it more efficient and environmentally friendly.

Career Highlights

John is associated with Warwick International Group Limited, where he continues to push the boundaries of innovation in the chemical processing sector. His expertise and inventions have paved the way for improved techniques that are likely to have a lasting impact on the industry.

Collaborations

Throughout his career, John has collaborated with fellow innovators Mark Ardern Chadwick and Jane Williams. Together, they have contributed to advancements in technologies related to pulp bleaching, demonstrating the importance of teamwork in driving innovation.

Conclusion

In summary, John David Withenshaw stands out as a significant figure in the realm of inventions related to alkaline bleaching processes. His dedication to innovation and collaboration underscores the vital role that inventors play in shaping the future of industry technologies. With several patents to his name, John continues to be a driving force for advancements in the field.