Patents by Inventor Sylvain A. R. Dewaele

Sylvain A. R. Dewaele 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).

  • Conversion of 2-dialkylamino-3H-azepines into epsilon caprolactams
    Patent number: 4110323
    Abstract: This invention relates to a process of catalytically converting nitrobenzene to 2-amino-3H-azepines by the reaction of the nitrobenzene with trisaminophosphine and an amine of the formula HNR'.sub.2, where R' is lower alkyl containing 1 to 6 carbon atoms.In addition, this invention concerns the catalytic hydrogenation of 2-amino-3H-azepine to epsilon caprolactam.
    Type: Grant
    Filed: November 15, 1976
    Date of Patent: August 29, 1978
    Assignee: S.A. Texaco Belgium n.v.
    Inventor: Sylvain A. R. Dewaele
  • Process for treating an acidic waste water stream
    Patent number: 4035293
    Abstract: Disclosed is a process for purifying an effluent containing acids such as phosphonic and phosphoric acids by the addition of CaO or Ca(OH).sub.2 in an amount ranging from 55-93 per cent by weight basis acids at a temperature of 35.degree. to 100.degree. C to a pH of 8 to 12. After removing the precipitated material, the effluent can be neutralized with CO.sub.2 gas. The precipitate can be calcined to tri calcium phosphate.
    Type: Grant
    Filed: July 17, 1975
    Date of Patent: July 12, 1977
    Assignee: S.A. Texaco Belgium N.V.
    Inventors: Antoine Benoit, Sylvain A. R. Dewaele, Andre Verhelst
  • Process for making o- and p-chlorophenols
    Patent number: 3953530
    Abstract: Disclosed is a process for making ortho- and para-chlorophenols by treating alpha-cumylchloride with an aqueous hydrogen peroxide solution. The two products can be separated by distillation.
    Type: Grant
    Filed: January 10, 1972
    Date of Patent: April 27, 1976
    Assignee: S. A. Texaco Belgium N.V.
    Inventors: Lothar G. Dulog, Sylvain A. R. Dewaele