C CHEMISTRY; METALLURGY
C07 ORGANIC CHEMISTRY
C07C ACYCLIC OR CARBOCYCLIC COMPOUNDS
C07C67/00 Preparation of carboxylic acid esters
C07C67/48 Separation; Purification; Stabilisation; Use of additives
C07C67/52 by change in the physical state, e.g. crystallisation
C07C67/54 by distillation