公开(公告)号：US3825512A

公开(公告)日：1974-07-23

申请号：US28817672

申请日：1972-09-11

申请人： SUMITOMO CHEMICAL CO ,  UNIVERSAL PVC RESINS

发明人： REITER W ,  COOPER J ,  SHETH K

IPC分类号： C08F14/00 ,  B01J19/00 ,  B01J19/26 ,  C08F2/00 ,  C08F6/00 ,  C08F6/06 ,  C08F14/06 ,  C08F1/11

CPC分类号： B01J19/26 ,  B01J19/0013 ,  B01J2219/00101 ,  B01J2219/00108 ,  C08F14/06 ,  C08F2/16

摘要： FFIG-01 THIS INVENTION PROVIDE AN IMPROVED PROCESS FOR POLYMERIZING VINYL CHLORIDE IN AN AQUEOUS MEDIUM USING A REFLUX CONDENSER. THE IMPROVEMENT COMPRISES (1) DURING THE CONDENSATION PERIOD SPRAYING A COATING OF WATER ON THE INNER SURFACES OF THE COMDENSER TO INHIBIT THE FORMATION THEREON OF POLYMERIZED VINYL CHLORIDE PARTICLES, AND (2) SPRAYING WATER IN THE PATHOF AND IN A DIRECTION COUNTER-CURRENT TO THE FLOW OF VINYL CHLORIDE VAPORR AS IT PROGRESSES FROM THE REACTOR TO WITHIN THE CONDENSER THEREBY TO ASSIST IN CONDENSING THE VINYL CHLORIDE FOR RETURN TO THE REACTOR. THE SPRAY MAY INCLUDE A DEFOAMER TO REDUCER THE TENDENCY OF CARRYOVER OF POLYMER INTO THE CONDENSER TUBES.

公开(公告)号：US3808184A

公开(公告)日：1974-04-30

申请号：US26285072

申请日：1972-06-14

申请人： UNIVERSAL PVC RESINS

发明人： REITER W ,  SHETH K ,  STALLINGS J

IPC分类号： C08J11/02 ,  C08F1/88

CPC分类号： C08J11/02

摘要： IN THE POLYMERIZATION OF VINYL CHLORIDE, UNREACTED MONOMER RECOVERED AFTER POLYMERIZATION IS PREVENTED FROM POLYMERIZING IN THE RECOVERY SYSTEM BY A NONTOXIC, WATER-MISCIBLE, VINYL CHLORIDE-IMMISCIBLE POLYMERIZATION INHIBITOR HAVING A HIGH BOILING POINT, SUCH AS TRIETHANOL AMINE, ADDED TO THE UNREACTED MONOMER IN THE RECOVERY SYSTEM.