公开(公告)号：CA1070449A

公开(公告)日：1980-01-22

申请号：CA252138

申请日：1976-05-10

Applicant: BASF AG

Inventor： MIETZNER FRANZ G ,  BUECHNER OSKAR ,  STEIGERWALD KLAUS ,  SCHLICHTHAERLE GOTTFRIED ,  URBAN FRIEDRICH

IPC: C08F6/00 ,  C08F2/00 ,  C08F6/06 ,  C08F10/02 ,  C08F110/02

Abstract: A process for the manufacture of ethylene polymers by homopolymerization and copolymerization of ethylene at pressures of from 500 to 5,000 bars and at from 50 to 450.degree.C, with subsequent isolation of the polymers in high pressure product isolation zones and low pressure product isolation zones. The various parallel product isolation zones are at different temperatures, and the mean product residence times in the zones may be identical or different. Very different products, in amounts which can be chosen according to requirements, and with mutually independent polymer properties, can be obtained using only one high pressure polymerization system.

公开(公告)号：CA1068448A

公开(公告)日：1979-12-18

申请号：CA270376

申请日：1977-01-21

Applicant: BASF AG

Inventor： BOETTCHER KLAUS ,  HOERDT HEINRICH G ,  ZACHER WIELAND ,  BUECHNER OSKAR

IPC: C08F6/00 ,  C08F2/00 ,  C08F2/34 ,  C08F6/06 ,  C08F6/26 ,  C08F10/00 ,  C08F10/02 ,  C08F2/02

Abstract: A process for the high pressure polymerization of ethylene at elevated temperatures in a polymerization zone followed by transfer of the reaction mixture, through a cooling zone, into the separation zone. In this process, the pressure at the cooling zone outlet is perodically reduced briefly, at recurring intervals, these brief pressure reductions being independent of the pressure reductions in the polymerization zone. Using this process, the conversion in the polymerization unit can be increased and a more homogeneous ethylene polymer can be obtained.

公开(公告)号：CA873413A

公开(公告)日：1971-06-15

申请号：CA873413D

Applicant: BASF AG

Inventor： BUECHNER OSKAR ,  IMMEL WOLFGANG ,  SCHMIDT-THOMEE GEORG ,  URBAN FRIEDRICH ,  PFANNMUELLER HELMUT