NOVELTY - Method of separating mixture comprising alcohol, fatty acid alkyl esters, glycerol and fatty acid glycerol ester involves separating portion of fatty acid alkyl ester by membrane filtration.    USE - Method of separating mixture comprising alcohol, fatty acid alkyl esters, glycerol and fatty acid glycerol ester used for biodiesel.    ADVANTAGE - The method efficiently and economically separates mixture comprising alcohol, fatty acid alkyl esters, glycerol and fatty acid glycerol ester.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) reactor system (1) for production of fatty acid alkyl ester, which comprises a transesterification station (2) with an oil inlet (4), an alcohol inlet (5) and an outlet (6), and a filtration unit (3) comprising a filter (10) with an retentate space (11) with an inlet (14) operatively connected to the outlet of the transesterification station, an permeate space (12) and a filter membrane (13) separating the retentate space from the permeate space. The retentate space comprises a residue outlet and the permeate space comprises a filtrate outlet (16); and    (2) filtration unit, which comprises a filter (10) with retentate space (11), a permeate space (12) and a filter membrane (13) selective for fatty acid alkyl ester and glycerol separating the retentate space from the permeate space. The retentate space comprises inlet (14) and residue outlet (15). The permeate space comprises a filtrate outlet (16) operatively connected to a filter (20) of the filtration unit (3). The filter (20) comprises retentate space (21) with an inlet (24) and a residue outlet (26), a permeate space (22) with a filtrate outlet (26) and an alcohol selective filter membrane (23) separating the etentate space from the permeate space.    DESCRIPTION OF DRAWING(S) - The drawing shows the flowchart of method of separating mixture comprising alcohol, fatty acid alkyl ester.    Reactor system (1)    Transesterification (2)    Filtration unit (3)    Oil inlet (4)    Alcohol inlet (5)    Outlet (6)    Filter (10)    Retentate space (11,21)    Permeate space (12,22)    Filter membrane (13)    Inlet (14,24)    Filtrate outlet (16)    Filter (20)    Residue outlet (26)