公开(公告)号：DE3662257D1

公开(公告)日：1989-04-13

申请号：DE3662257

申请日：1986-05-16

Applicant: HOECHST AG

Inventor： SCHWARZMAIER PETER ,  FROHLICH WALTER DR ,  KUHN WENZEL DR ,  RIEDL JOSEF DR ,  SCHAFFELHOFER IWO DR ,  MITTERMAIER ERICH ,  KRUMBOCK REINHARD

IPC: C07C17/04 ,  C07C17/00 ,  C07C17/38 ,  C07C17/383 ,  C07C19/045 ,  C07C67/00

Abstract: A process for the purification of 1,2-dichloroethane is described, in which the crude product, containing not more than 3% by weight of high-boilers, is distilled in a first column at 125 DEG to 180 DEG C. in such a way that the bottom product contains not more than 7% by weight of high-boilers. The purified, vaporous 1,2-dichloroethane discharged at the head of this column is used to heat product streams containing 1,2-dichloroethane. The bottom product from the first column is distilled in a second column, advantageously at a pressure of 5 to 40 kPa, together with a feed composed of vaporous 1,2-dichloroethane obtained from the reaction of ethylene with chlorine. The process makes it possible to purify 1,2-dichloroethane with a saving in energy.

公开(公告)号：DE3460268D1

公开(公告)日：1986-08-07

申请号：DE3460268

申请日：1984-08-03

Applicant: HOECHST AG

Inventor： FELIX BERND DR ,  FROHLICH WALTER DR ,  KATZENBERGER HEINER

IPC: C07C17/00 ,  C07C17/25 ,  C07C21/06 ,  C07C67/00 ,  C07C17/34

公开(公告)号：ES2054710T3

公开(公告)日：1994-08-16

申请号：ES88100904

申请日：1988-01-22

Applicant: HOECHST AG ,  UHDE GMBH

Inventor： LINK GERHARD ,  FROHLICH WALTER DR ,  KRUMBOCK REINHARD ,  PRANTL GEORG ,  SCHAFFELHOFER IWO DR

IPC: C07C21/06 ,  C07C17/00 ,  C07C17/25 ,  C07C67/00 ,  C07C17/34

Abstract: Gaseous 1,2-dichloroethane which has been produced in a variety of ways is heated indirectly by the hot, vinyl chloride-containing gases which are led away from the radiation zone of the pyrolysis furnace. This allows the heat of the pyrolysis gases to be utilised in a favourable manner, pyrolysis rates to be increased, and operation times of the pyrolysis furnace to be prolonged.