Company Filing History:
1 out of 8 
1 out of 15 Years Active: 1998-2025
Title: Douglas S. Hubbell: Innovator in Styrene and Paraxylene Recovery
Introduction
Douglas S. Hubbell is a notable inventor based in Sudbury, MA (US), recognized for his contributions to the fields of chemical engineering and purification processes. He holds two patents that showcase his innovative approaches to enhancing the recovery of valuable chemical compounds.
Latest Patents
One of his latest patents is titled "Systems and methods for enhancing the recovery of styrene." This method involves feeding a hot liquid residue stream to a stripping vessel from a styrene monomer purification finishing system. The hot liquid residue stream contains styrene and compounds that are less volatile than styrene. The method introduces a gas to the stripping vessel to strip a portion of the styrene as vapor, generating a vaporized styrene portion. This vaporized styrene portion and the gas are returned to the styrene monomer purification finishing system, allowing for the recovery of at least a portion of the vaporized styrene into a styrene monomer product. The process also produces a final liquid residue stream from the bottom of the stripping vessel, which has a lower concentration of styrene than the hot liquid residue stream that feeds the stripping vessel.
Another significant patent by Hubbell is the "Crystallization process for purification of paraxylene." This patent discloses an improved process and apparatus for purifying paraxylene from mixed C8-aromatic feedstocks. The innovation involves the use of at least two crystallization stages operated at different temperatures, combined with a final product separator. This approach enhances purity and recovery while simultaneously reducing capital and energy costs.
Career Highlights
Throughout his career, Douglas S. Hubbell has worked with prominent companies such as Raytheon Engineers & Constructors, Inc. and T.en Process Technology, Inc. His experience in these organizations has contributed to his expertise in chemical processes and innovations.
Collaborations
Hubbell has collaborated with notable professionals in his field, including Philippe W. Rutten and Slawomir A. Oleksy. These collaborations have likely enriched his work and contributed to the advancements in his patented technologies.
Conclusion
Douglas S. Hubbell is a distinguished inventor whose work in enhancing the recovery of styrene and purifying paraxylene has made significant contributions to the chemical engineering field. His innovative patents reflect his commitment to improving industrial processes and
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