John Hessler

Title: John Hessler: Innovator in Carbon Molecular Sieve Membranes

Introduction

John Hessler, an accomplished inventor based in Ellsworth, ME, has made significant contributions to the field of materials science, particularly in the development of carbon molecular sieve membranes. With two patents to his name, Hessler's work focuses on innovative methods that enhance the efficiency and selectivity of gas separation technologies.

Latest Patents

Hessler's latest patents revolve around the method of making carbon molecular sieve (CMS) membranes. The first patent details an improved process through which a precursor polymer undergoes pyrolysis to create a CMS membrane. This membrane is then exposed to a specific conditioning atmosphere containing target permeate gas molecules, such as ethylene. This exposure occurs ideally within five days of cooling from the pyrolyzing temperature, ensuring that the desired levels of permeance and selectivity are maintained. The membranes produced in this manner demonstrate enhanced stability and effectiveness in separating gases from hydrocarbon gas streams, including methane from natural gas and oxygen from air.

The second patent elaborates on a refined method for producing CMS membranes, wherein a polyimide precursor polymer is subjected to a carefully controlled pyrolysis process. This method involves heating the polymer to a final pyrolysis temperature of between 600°C to 700°C, maintained for a maximum of 60 minutes in a non-oxidizing atmosphere. The cooling rate is optimized to hasten heat removal. The resulting membranes again exhibit improved selectivity and permeance, positioning them effectively for gas separation applications.

Career Highlights

John Hessler has collaborated with leading organizations in his field, including Dow Global Technologies LLC and Georgia Tech Research Corporation. His career is marked by a commitment to advancing gas separation technologies, making significant strides in the utility and applicability of carbon molecular sieve membranes.

Collaborations

Throughout his career, Hessler has worked alongside esteemed colleagues, including William John Koros and Liren Xu. These collaborations have fostered a dynamic exchange of ideas and techniques, contributing to the innovation and refinement of gas separation processes.

Conclusion

John Hessler's contributions to the field of carbon molecular sieve membranes highlight his role as a key figure in materials science innovation. Through his patents and collaborative efforts, he continues to pave the way for advancements in gas separation technology, showcasing the impact of inventive work within the industry. His commitment to improving the functionality and efficiency of CMS membranes underscores the importance of ongoing innovation in scientific research and development.