公开(公告)号：US3756996A

公开(公告)日：1973-09-04

申请号：US3756996D

申请日：1971-02-25

Applicant: NAT DISTILLERS CHEM CORP

Inventor： PUGH D ,  PALMER W ,  HORNEY R ,  SPOMER R ,  WOLFENBERGER C

IPC: B01F7/00 ,  B01F15/00 ,  B01J3/04 ,  B01J19/00 ,  B01J19/18 ,  B01J19/20 ,  C08F2/00 ,  C08F10/00 ,  C08F1/60 ,  C08F3/04

CPC classification number: B01F7/0025 ,  B01F7/00141 ,  B01F7/00908 ,  B01J3/042 ,  B01J19/002 ,  B01J19/18 ,  B01J19/20 ,  B01J2219/00063 ,  B01J2219/00094 ,  B01J2219/00155 ,  B01J2219/00159 ,  B01J2219/00779 ,  B01J2219/185 ,  C08F10/00 ,  C08F4/28

Abstract: A PROCESS AND APPARATUS FOR THE PRODUCTION OF ETHYLENE POLYMERS AT HIGH PESSURES WITHIN A MODIFIED, STIRRED AUTOCLAVE-TYPE REACTION SYSTEM SUBDIVEDED INTO THREE ZONES, INTO THE FIRST OF WHICH A FIRST, LOW TEMPERATURE FREE RADICAL, CHAIN-INITATING CATALYST IS FED, AND INTO THE SECOND OF WHICH A SECOND, INTERMEDIATE TEMPERATURE FREE RADICAL, CHAIN-INITATING CATALYST AND A THIRD, HIGH TEMPERATURE FREE RADICAL, CHAIN-INITIATING CATALYST ARE INTRODUCED. THE FIRST ZONE IS SO AGITATED AS TO PRODUCE BOTH RADIAL AND END-TOEND MIXING THEREIN TO THEREBY ESTABLISH A SIBSTANTIALLY UNIFORM REACTION TEMPERATURE THEREIN, WHEREAS THE SECOND ZONE IS SO AGITATED AS TO PRODUCE RADIAL MIXING THEREIN, WITH THE DEGREE OF END-TO-END MIXING DECREADING LONGITUDINALLY OF THE ZONE TO THEREBY ESTABLISH A TEMPERATURE DIFFERENTIAL LONGITUDINALLY THEREOF. BOTH RADIAL AND ENDTO-END MIXING ARE ESTABLISHED WITHIN THE THIRD ZONE IN A MANNER SUCH AS TO INCREASE BACK MIXING OF THE REACTION MIXTURE THEREIN, AND THEREBY CONTROL THE TEMPERATURE OF THE REACTION MIXTURE LEAVING SUCH ZONE AND EXITING FROM THE REACTION SYSTEM.