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Title: Recovery of o-chlorobenzilidene malononitrile from finely divided mixtures thereof with colloidal silica

Abstract: A method of recovering o-chlorobenzilidene malononitrile from finely divi particulate mixtures thereof with colloidal silica. The mixture is contacted with a solvent such as methylene chloride, in which the o-chlorobenzilidene malononitrile is highly soluble and the colloidal silica is insoluble, the resulting solution is filtered to remove the insoluble colloidal silica, and the o-chlorobenzilidene malononitrile is crystallized from the filtrate.


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Inventors: Klein, Joel M. (Baltimore, MD, US)

Application Number: 930082
Filing Date: 1978-08-01
Publication_date: 1979-02-20
Assignee: The United States of America as represented by the Secretary of the Army (Washington, DC)
Primary Class(es): 558/401
Other Classes:
US Patent Ref:
3549683Dec, 1970Rosin260/465.
3963770Jun, 1976Knapp260/465.

Other Refs:
Primary Examiner: Torrence, Dolph H.
Assistant Examiner:
Attorney: Edelberg; Nathan, Card, Jr.; Harold H., Erkkila; A. Victor