Stephen John Evans

Title: Stephen John Evans: Innovator in Ethylene Processing

Introduction

Stephen John Evans, located in Roodepoort, South Africa, is an accomplished inventor known for his significant contributions to the field of chemical engineering. With four patents to his name, Evans has developed innovative processes that enhance the production of olefins, particularly in the context of ethylene tetramerization and oligomerization.

Latest Patents

Among his notable inventions, one is titled "Tetramerisation of Ethylene," which details a process for the tetramerization of ethylene under solution phase conditions. This method utilizes an activated catalyst composed of chromium and a diphosphine ligating compound, operated at temperatures ranging from 80°C to 115°C. This process is capable of generating at least 30% 1-octene and a polyethylene co-product that remains largely ensconced in the liquid phase, maintaining a specific set of molecular weight properties.

Another significant patent by Evans is related to the "Oligomerisation of Olefinic Compounds with Reduced Polymer Formation." This method involves the oligomerization of an olefinic compound to create an oligomeric product, utilizing a catalyst system that includes a source of chromium and a non-metal oxygen-containing additive. The precise ratio of the additive to chromium ensures optimal productivity, demonstrating Evans's meticulous approach to chemical innovation.

Career Highlights

Stephen John Evans has contributed his expertise to Sasol Technology, holding roles in both Sasol Technology Proprietary Limited and Sasol Technology (Pty) Limited. His work in these organizations has allowed him to refine his inventive processes and collaborate with leading professionals in the chemical industry.

Collaborations

Throughout his career, Evans has worked closely with esteemed colleagues such as Kevin Blann and Martin John Hanton. Their collaborations have been instrumental in furthering the applications and efficiencies of the technologies they developed together.

Conclusion

Stephen John Evans exemplifies the spirit of innovation within the field of chemical engineering. His patents not only advance the understanding of olefin processing but also enhance the commercial viability of ethylene derivatives. As a pioneering inventor, his contributions continue to impact the industry, leaving a legacy of creativity and technical prowess.