METHOD FOR RECLAMATION OF ISOBUTYL ALCOHOL IN PRODUCTION OF HIGH-STRENGTH ARAMID FIBRES Russian patent published in 2014 - IPC C07C31/12 C07C29/80 D01F6/80 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for reclamation of isobutyl alcohol in production of high-strength aramid fibres. The method includes neutralising starting solutions, rectification of a stretch bath solution in two columns, vacuum evaporation of a mixture of the still residue of a second column and the settling bath, rectification of the still residue of the vacuum evaporation apparatus, vacuum rectification of the evaporated product of the vacuum evaporation apparatus and a third column, rectification of the aqueous fraction to remove lutter water and rectification of the organic fraction to obtain the end product. Multicomponent starting mixtures containing 0-60% dimethyl acetamide (DMAA), 0-70% isobutyl alcohol, as well as lithium chloride (LiCl) or calcium chloride (CaCl₂), hydrogen chloride, water and impurities making up the balance, are initially divided into mixtures containing lithium chloride or calcium chloride and mixtures not containing ether; the mixtures which do not contain lithium chloride or calcium chloride are divided into mixtures containing DMAA and mixtures which do not contain DMAA, and a liquid stream consisting of isobutyl alcohol and water and which does not contain DMAA, after cooling, is divided into two phases - an aqueous phase and an organic phase; the organic phase is fed for heteroazeotropic rectification, where water is separated at atmospheric pressure and anhydrous isobutyl alcohol is obtained.

EFFECT: method enables to obtain isobutyl alcohol of high quality.

1 dwg