Method for preparing alkali metal sulphide

摘要

The present invention concerns a method for preparing an alkali metal sulfide, from at least one oxygenated alkali metal compound comprising at least one step a) involving reacting said oxygenated alkali compound(s) with at least one sulfur compound of formula (I):;;in which: R represents a linear or branched alkyl or alkenyl radical, containing 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms; n is equal to 0, 1 or 2; x is equal to 0 or to a whole number having a value of between 1 and 10, preferably x is a whole number equal to 1, 2, 3 or 4; R′ represents a linear or branched alkyl or alkenyl radical, containing 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms or, only if n=x=0, a hydrogen atom; or indeed R and R′ can form, together and with the sulfur atom(s) bearing them, a sulfur heterocycle containing 2 to 12 carbon atoms, preferably 2 to 8 carbon atoms, and optionally one or a plurality of heteroatoms chosen from oxygen, nitrogen and sulfur.

主权项

1. A process for the preparation of an alkali metal sulfide from at least one oxygen-comprising alkali metal compound, comprising at least one stage a) involving reacting said oxygen-comprising alkali metal compound(s) with at least one sulfur-comprising compound of formula (I): in which:
R represents a linear or branched alkyl or linear or branched alkenyl radical comprising from 1 to 6 carbon atoms, limits included;n is equal to 0, 1 or 2;x is equal to 0 or to an integer taking the values from 1 to 10, limits included;R′ represents a linear or branched alkyl or linear or branched alkenyl radical comprising from 1 to 6 carbon atoms, limits included, or, only if n=x=0, a hydrogen atom;or else R and R′ can together form, and with the sulfur atom(s) which carry(ies) them, a sulfur-comprising heterocycle comprising from 2 to 12 carbon atoms, limits included, and optionally, in addition to the sulfur atom(s) indicated in the formula (I), one or more heteroatoms chosen from oxygen, nitrogen and sulfur.