METHOD OF EXTRACTING AND SENDING FOR RECYCLING RUTHENIUM HOMOGENEOUS CATALYSTS Russian patent published in 2016 - IPC B01J31/40 B01J38/52 B01D11/04 B01J23/46 B01J31/18 C07C27/04 

FIELD: chemistry.

SUBSTANCE: invention describes method for extraction of homogeneous ruthenium catalyst from glycolic acid hydrogenation reaction product, glycolic acid esters and/or glycolic acid oligomers under action of extractant containing hydrophobic solvent and optional hydrophilic solvent. Ruthenium catalyst, which may include 1,1,1-tris(diaryl- or dialkylfosfinomethyl)alkane ligands, can be extracted from hydrophobic extract phase as result of extraction under action of hydrophilic solvent and sent for recycling in process of producing ethylene glycol as result of glycolic acid and glycolic acid derivatives hydrogenation.

EFFECT: technical result is effective method of ruthenium-1,1,1-tris(diaryl- or dialkylfosfinomethyl)alkane catalyst compositions extracting from glycolic acid hydrogenation waste product till maximum extraction of catalyst system at minimal costs in combined method, taking into account stages of both reaction and separation for producing ethylene glycol.

29 cl, 7 dwg, 26 tbl, 17 ex