The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 29, 1987
Filed:
Dec. 16, 1985
Louis F Bolzan, Briarcliff Manor, NY (US);
Stauffer Chemical Company, Westport, CT (US);
Abstract
The invention pertains to a process for producing a disulfide dimer of hydrocarbylthiophosphonic dichloride wherein a hydrocarbylthiophosphonic dichloride is reacted with hydrogen sulfide. In the process disclosed, the reaction is conducted in the presence of a small amount of solvent which dissolves the product at high temperature and has very low solubility in the product at low temperature. In recovering the product an additional amount of solvent is added to the reaction product thereby allowing for the recovery of the product as a slurry after completion of the reaction. Optionally and preferably, a packed column is used in the process which increases the reaction rate.