公开(公告)号：US3809688A

公开(公告)日：1974-05-07

申请号：US22310572

申请日：1972-02-03

Applicant: SNAM PROGETTI

Inventor： CLEMENTI A ,  BATTINI R

IPC: B01J19/24 ,  C08F2/00 ,  C08F10/00 ,  C08F1/60 ,  C08F1/88 ,  C08F3/04

CPC classification number: B01J19/2415 ,  B01J2219/00094 ,  B01J2219/00159 ,  B01J2219/00162 ,  C08F10/00 ,  C08F4/28

Abstract: ETHYLENE IS POLYMERIZED UNDER A PRESSURE OF 1000 TO 5000 ATMOSPHERES IN THE PRESENCE OF A CATALYST AND POLYMERIZATION PROMOTER IN A TUBULAR REACTOR HAVING A PREHEATING ZONE AND A REACTION ZONE FROM WHICH A MIXTURE INCLUDING POLYETHYLENE AND UNREACTED ETHYLENE IS CONTINUOUSLY FED TO AN EXPANSION TUBE WHOSE INTERNAL DIAMETER IS SUBSTANTIALLY LESS THAN THE INTERNAL DIAMMETER OF THE REACTION ZONE TUBE AND WHERE THE PRESSURE AND TEMPERATURE OF THE MIXTURE FROM THE REACTION ZONE IS SUBSTANTIALLY REDUCED, THEN THE POLYETHYLENE IS SEPARATED FROM UNREACTED ETHYLENE WHICH IS RECYCLED.

公开(公告)号：US3772262A

公开(公告)日：1973-11-13

申请号：US3772262D

申请日：1971-02-18

Applicant: SNAM PROGETTI

Inventor： CLEMENTI A

IPC: C08C2/06 ,  C08F10/00 ,  C08D3/04 ,  C08D3/06 ,  C08D5/00

CPC classification number: C08C2/06 ,  C08F10/00 ,  Y10S159/10 ,  C08F2/38

Abstract: THE PRESENT INVENTION PROVIDES A PROCESS FOR RECOVERING POLYMERS OF CONJUGATED DIENE MONOMERS FROM ORGANIC SOLUTIONS BY MEANS OF TWO STRIPPERS USING STEAM AND WATER AND EFFECTING TRANSFER FROM THE FIRST TO THE SECOND STRIPPER BY A PRESSURE DIFFERENTIAL.