Louis B Bolzan

46786120, Jul 7, 1987

Jan 31, 1986

6/824741

Louis F. Bolzan - Briarcliff Manor NY
Edward D. Weil - Hastings-on-Hudson NY

Stauffer Chemical Company - Westport CT

C07C14370

260543R

There is disclosed a process for the production of arylsulfonyl halides, e. g. , benzenesulfonyl chloride. The disclosed process adds a phosphorus-containing additive, e. g. , phosphorous acid, before the reaction of an arylsulfonic acid with a sulfur halide and a halogen. The phosphorus-containing additive reduces the thermal instability of the residue remaining after distillation of the arylsulfonyl halide.

46970282, Sep 29, 1987

Dec 16, 1985

6/809631

Louis F. Bolzan - Briarcliff Manor NY

Stauffer Chemical Company - Westport CT

C07F 938

558 89

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.