Process for producing a disulfide dimer of EPTD

Details Process for producing a disulfide dimer of EPTD Process for producing a disulfide dimer of EPTD

1985-12-16

1987-09-29

Sneed, Helen M. S.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

568 14, C07F 938

Patent

active

046970282

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.

REFERENCES:
patent: 3155708 (1964-11-01), Chupp et al.
patent: 3155709 (1964-11-01), Newallis et al.
patent: 3496235 (1970-02-01), Maier
Maier, Topics in Phosphorus Chemistry, vol. 2, pp. 50-59, Interscience (1980).

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