Patent ID: 6235953
Filing Date: 2001-05-22
Classification: B01J,C07C,Y02P

Abstract:
A process for preparing 1,2-dichloroethane (EDC) by feeding ethylene and chlorine into circulating EDC with intensive mixing and heat recovery, which comprisescarrying out reaction in a reactor (1) at a temperature of from 65 to 125.degree. C. and at a pressure of from 0.5 to 3.2 bar absolute, pressure and temperature being chosen such that a reaction mixture boils;conducting heat of reaction away from a gas space and supplying said heat to at least one heat exchanger (10);taking off part of the gaseous reaction mixture from the gas space, condensing the EDC in said heat exchanger (10) and passing the liquid EDC back to the reactor;feeding a part (12) of the gaseous reaction mixture (8) at a side infeed point into a distillation column (15) from which inert gas fractions and unreacted ethylene (16) are taken off from the top, pure EDC (26) is taken off at the side below the infeed point, and high-boiling by products (27) are separated off from the bottom; andproviding from said distillation column (15) said line for volatile products (16) to a condenser (17) having a circuit line (18) to a return flow vessel (19) connected to a pump (20) having a line for taking off low-boiling products (21) and a drier (22) and there being a line for off-gas (23) leading to a condenser (24) and a pump (25).