Recovery of residue liquid from the process for carbonylation of methanol to acetic acid

Recovery of the residue liquid from the process for carbonylation of methanol to acetic acid was studied experimentally.The residue liquid firstly was evaporated by the Pope wiped-film molecular still and evaporator,then separated by precise rectification to obtain three high pure products—acetic acid,acetoxyacetic acid and ethylene glycol diacetate.Gas chromatography method was used to determine the separated components quantitatively.The optimized operation parameters of the whole recovery process were obtained and the process feasibility was verified,which provided reliable foundation data for its commercialization.