公开(公告)号：US3644483A

公开(公告)日：1972-02-22

申请号：US3644483D

申请日：1967-09-12

Applicant: INVENTA AG

Inventor： GRIEHL WOLFGANG ,  HAHN WOLF DIETER ,  PLENZ JOACHIM

IPC: C08G63/78 ,  C07C69/82

CPC classification number: C08G63/785

Abstract: A PROCESS FOR THE CONTINOUS MANUFACTURE OF FIBERFORMING POLYESTER OF COPOLYESTER FROM DICARBOXYLIC ACIDS AND GLYCOLS WHEREIN THE FORMATION OF UNDESIRABLE DIGLYCOLS IS SUPPRESSED. THE MATERIAL ARE DIRECTLY ESTERIFIED BY INTRODUCING THEM INTO A TUBULAR REACTION CONE AT 150-250* WHEREIN A CONSIDERABLE PORTION ESTERIFIES. THE PRODUCT THEN IS INTGRODUCED INTO A PRECONDENSATE OF THE SAME INGREVACUUM OR 25-100 TORR. THE WATER OF EACTION AND FREE GLYCOL IMMEDIATELY EVAPORATE UNDER THE INFLUENCE OF THE VACUUM. AS SOON AS THIS REACTION PRODUCT ATTAINS A DEGREE OF POLYCONDENSATION FO 2-6, A PORTION THEREOF CONTINUOUSLY IS WITHDRAWN IN PROPORTION TO NEW ACID INTRODUCED. THE CONDENSATE WITHDRAWN THEN POLYCONDENSED IN THE CONVENTIONAL MANNER TO A FIBER-FORMING POLYESTER. IN A PREFERRED EMBODIMENT, A PART OF THE GLYCOL IS WITHHELD AND SUBJECTED TO A GLYCOLYSIS WITH THE PRECONDENSATE PRIOR TO ITS ENTRY INTO THE REACTION.