公开(公告)号：US3544525A

公开(公告)日：1970-12-01

申请号：US3544525D

申请日：1968-03-26

Applicant: ALLIED CHEM

Inventor： BALINT LASZLO J ,  ABOS RAMON LUIS ,  SNIDER ORVILL E

IPC: B29B9/06 ,  B29B13/06 ,  C08G63/80 ,  C08G63/88 ,  C08J3/12 ,  C08G17/003

CPC classification number: C08J3/12 ,  B29B9/06 ,  B29B13/065 ,  B29K2067/00 ,  C08G63/80 ,  C08G63/88 ,  C08J2367/02

Abstract: 1,257,967. Solid state polymerisation. SNIA VISCOSA SOC: NAZIONALE INDUSTRIA APPLICAZIONI VISCOSA S.p.A. 4 Feb., 1969 [26 March, 1968], No. 5907/69. Heading B1X. [Also in Divisions C3 and F4] Crystallised polyester pellets are simultaneously dried and solid-state polymerised by passing them continuously through a vessel 47 in countercurrent to a heated inert gas. Polyester which has been either pelletised and crystallised in a fluidised bed enters at the top of vessel 47 and falls as a bed under gravity, the pellets being removed at the base of the vessel by discharge rotary valve 58. The inert gas is first heated to a temperature of from 160 to 212‹C in heater 43 and then enters vessel 47 via plenum chamber 46, leaving via chamber 51. The gas velocity is kept below fluidization rates (below 2.1 ft/sec.). A level controller 50 is provided for controlling the residence time of the polymer in the vessel. The vessel should preferably have a height of at least six times its diameter and a cross-sectional area of at least twice that of the fluidised crystalliser used in the preceding step. Specified dimensions for the vessel are given in Examples 7-10.