Fig. 1. Flow diagram of two-stage sunflower oil transesterification using ethanol and sodium methoxide as catalyst. R-1, -2: transesterification reactors 1 and 2; R3: glycerine
phase neutralization reactor; D-1, -2: decanters 1 and 2; W-1, -2: washing tanks; DY-1: drying tank; E-1: esterification reactor; DES-1: distillation tower. The streams 1- to
14-are identified using the same numbers as in Table 2.