RU99101837A - METHOD FOR PRODUCING 1,2-Dichloroethane by Direct Chlorination - Google Patents

Claims (10)

1. The method of producing 1,2-dichloroethane (ethylene dichloride, EDC) by introducing ethylene and chlorine into the circulating EDC with vigorous stirring and heat recovery, characterized in that the interaction is carried out at a temperature of 65-125 ° C and an absolute pressure of 0.5 to 3 , 2 bar. moreover, the pressure and temperature are selected so as to ensure boiling of the reaction mixture, and the heat of reaction is removed from the space filled with gases and sent to at least one heat exchanger.  2. The method according to p. 1, characterized in that part of the gaseous reaction mixture is removed from the space filled with gases, the EDCs are condensed in a heat exchanger, and the liquid EDC is returned to the reactor.  3. The method according to p. 1 or 2, characterized in that a part of the gaseous reaction mixture is introduced laterally into the distillation column, from which inert gas components and unreacted ethylene are removed from above, pure EDC is removed from the side below the reaction mixture inlet, and high boilers are separated from the cube by-products.  4. The method according to p. 3, characterized in that for the operation of the distillation column using the heat of reaction from the gas-filled reactor space.  5. The method according to one or more of the preceding paragraphs, characterized in that carry out intensive mixing using a mixer without additional mixing devices.  6. The method according to one or more of the preceding paragraphs, characterized in that the reaction is carried out using a catalytic system consisting of Lewis acid and a metal halide of the first or second main groups of the Periodic system of elements.  7. The method according to p. 6, characterized in that the catalyst used is sodium chloride and iron (III) chloride in a molar ratio of less than 0.5.  8. Installation for implementing the method according to PP. 1-7, characterized by the presence of a reactor (1), mixer (2), level (3) of liquid EDC, a circulation pipe (4) for liquid EDC, a pump (5), supply pipelines (6.7) for chlorine, respectively ethylene, a discharge pipe (8) for the gaseous reaction mixture, a pipe (9) to a heat exchanger (10), a heat exchanger (10), a return pipe (11) from a heat exchanger (10) to a reactor (1), a pipe (12) to a distillation column and pipelines (13, 14) to the heat consumer, respectively, from the heat consumer.  9. Installation according to claim 8, characterized by the presence of a distillation column (15), a pipeline (16) for volatile products, a condenser (17), a circulation pipe (18), a tank (19) for reflux, a pump (20), and a pipe (21) ) for removal of low-boiling products, a dryer (22), a pipeline (23) for exhaust gases, a condenser (24), a pump (25), a pipeline (26) for EDC and a pipeline (27) for high-boiling products.  10. Installation according to claim 9, characterized in that it does not have a dryer (22) and a return pipe (28) is provided from the condenser (24) to the tank (19).