PREPARATION OF SYMMETRICAL AND ASYMMETRICAL DISULPHIDES BY REACTIVE DISTILLATION OF MIXTURES OF DISULPHIDES

摘要

The invention relates to a process for the preparation of symmetrical or asymmetrical dialkyl disulphides by involving at least one mixture of symmetrical and/or asymmetrical dialkyl disulphides in a basic and/or photochemical catalytic reaction, with joint extraction, preferably continuously, of the symmetrical and/or asymmetrical disulphide(s) which it is desired to obtain.;The process of the invention is particularly suited to the preparation of dimethyl disulphide or diethyl disulphide from a mixture of symmetrical and/or asymmetrical dialkyl disulphides.

主权项

1. A process for preparing symmetrical or asymmetrical dialkyl disulphides, the process comprising at least the following stages:
a) introducing, into a reactor, at least one mixture of at least two organic disulphides of general formula (1): R—Sn—R′, in which:
R and R′, which are identical or different, represent, each independently of one another, a linear or branched hydrocarbon radical comprising from 1 to 12 carbon atoms, and optionally one or more unsaturations in the form of double and/or triple bond(s); andn represents 2, b) carrying out a basic and/or photochemical catalytic reaction, during which the organic disulphides of formula (1) are converted, by reproportionation and by disproportionation, into a mixture of symmetrical and/or asymmetrical dialkyl disulphides, c) extracting the symmetrical and/or asymmetrical dialkyl disulphide(s) desired.