Stefan Hendrikus Schaafsma

Title: Innovations of Stefan Hendrikus Schaafsma

Introduction

Stefan Hendrikus Schaafsma is a notable inventor based in Susteren, Netherlands. He has made significant contributions to the field of chemical engineering, particularly in the development of urea products and controlled release fertilizers. With a total of six patents to his name, Schaafsma's work has had a considerable impact on agricultural practices.

Latest Patents

One of Schaafsma's latest patents is focused on the granulation of urea products. This invention discloses a method for creating a granulate of a urea product that includes urea and a salt, such as urea ammonium sulfate. The method allows for a high content of salt, which is above the solubility limit in urea, resulting in a granulate characterized by a smooth surface. This is particularly significant for urea ammonium sulfate, where such a smooth surface is not typically achieved with high ammonium sulfate content. The process involves dividing the feed liquids for granulation based on their salt content.

Another notable patent pertains to the method of making controlled release fertilizer particles. This invention describes a process that achieves high mechanical strengths in urea-containing particles through a lower degree of cooling. The method includes several steps, such as providing a first polymer layer, feeding urea droplets onto this layer, and applying a second polymer layer to encapsulate the droplets.

Career Highlights

Schaafsma has worked with prominent companies in the chemical industry, including Stamicarbon B.V. and Ciba Specialty Chemicals Corporation. His experience in these organizations has contributed to his expertise in developing innovative solutions for agricultural applications.

Collaborations

Throughout his career, Schaafsma has collaborated with notable colleagues, including Richard Johannes Matheus Janssen and Theodorus Marie Leopold Evers. These collaborations have likely enriched his work and led to further advancements in his field.

Conclusion

Stefan Hendrikus Schaafsma is a distinguished inventor whose contributions to the development of urea products and controlled release fertilizers have made a significant impact on agricultural practices. His innovative methods and collaborations continue to influence the industry positively.