FIELD: chemistry.
SUBSTANCE: invention pertains to methods (alternatives) of obtaining dinitrile compounds through hydrocyanation of unsaturated mononitrile compounds in the presence of a catalyst system, consisting of an organometallic complex, made from a metal and a mixture of organophosphorous ligands, containing at least one monodentante compound of organophosphite and at least, one organophosphorous bidentante compound, chosen from a group, consisting of organophosphite, organophosphinite, organophosphine, and possibly a promoter. The essence of the invention lies in that, in the method, there is control of the concentration unsaturated nitriles in the reaction medium after the hydrocyanation reaction for obtaining a mass concentration of unsaturated nitriles lower than 20% in the given medium. The given medium is passed to the decantation stage on two phases, the upper and the lower. These two phases are separated. The lower phase at least partially, is recirculated on the stated hydrocyanation stage, while the upper phase, through liquid phase extraction, is divided into an organometallic complex and organophosphorous compounds, present in the given upper phase of the dinitriles.
EFFECT: methods allow for separation and extraction of a catalyst and a product with minimum loss of compounds.
28 cl, 2 ex
