METHOD OF AUTOMATICALLY CONTROLLING PROCESS OF PRODUCTION OF 1,2-DICHLOROETHANE FROM ETHYLENE AND CHLORINE RECOVERED FROM EMISSION GASES Russian patent published in 2003 - IPC

FIELD: industrial organic synthesis. SUBSTANCE: invention, in particular, relates to controlling chemical-engineering processes carried out on reactor series to produce 1,2- dichloroethane via ethylene chlorination in boiling liquid reaction medium. Automated process control is effected when process is conducted in two consecutively engaged reactor units in refluxed reaction medium, the first unit being initial ethylene chlorination unit and the second after-chlorination unit for unreacted ethylene leaving chlorination unit. Streams of condensed products are partly returned into corresponding reactors to maintain required level of reaction medium and to some extent are withdrawn from unit by regulating specified consumption (100%) of chlorine. Correction of measured value of recovered chlorine consumption (which determines simplified dichloroethane product stream) is effected according to temperature, pressure, and concentration. Ratio of ethylene (in excess) stream to chlorine stream is regulated according to temperature and ethylene pressure. Ethylene excess stream factor in regard stream of 100% chlorine at the chlorinator inlet is corrected in dependence on concentration of chlorine in initial recovered chlorine stream: the higher concentration of chlorine the lesser its excess value. Stream of initial recovered chlorine is fed into post-chlorinator proportionally to ethylene stream coming out of chlorinator together with emission gases. EFFECT: minimized losses of ethylene and recovered chlorine. 1 dwg