Patents by Inventor Gerardus W. A. Hangx

Gerardus W. A. Hangx has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for recovering caprolactam from aqueous caprolactam product using in situ prepared alkali amino caproate
    Patent number: 7615137
    Abstract: A continuous process is provided for recovering caprolactam from aqueous caprolactam product which includes (i) caprolactam, (ii) impurities, and (iii) water by (a) adding alkali hydroxide to the aqueous caprolactam product, in an amount of not more than 100 mmol alkali hydroxide per kg of caprolactam; (b) reacting at least part of the added alkali hydroxide to form alkali amino caproate, to obtain a caproate-enriched caprolactam product; and (c) distilling the caproate-enriched caprolactam product at reduced pressure.
    Type: Grant
    Filed: August 23, 2002
    Date of Patent: November 10, 2009
    Assignee: DSM IP Assets B.V.
    Inventors: Arnold G M Jetten, Nicolaas F Haasen, Gerardus W A Hangx
  • Process for recovering caprolactam
    Patent number: 7141668
    Abstract: The invention relates to a process for recovering caprolactam from a mixture comprising caprolactam, water, light and heavy components, by subjecting the mixture to a first vacuum distillation resulting in a first bottom product comprising heavy components and caprolactam and in a fist overhead product comprising caprolactam, water, unsaturated lactams and light components; and subjecting at least part of the unsaturated lactams to a hydrogenation.
    Type: Grant
    Filed: November 25, 2002
    Date of Patent: November 28, 2006
    Assignee: DSM IP Assets B.V.
    Inventors: Theodorus M Smeets, Gerardus W. A. Hangx