Patent ID: 7850926
Filing Date: 2010-12-14
Classification: B01F,B01J,C08G

Abstract:
1. A stirring reactor having horizontal axis and comprising vertical product entraining surfaces as well as at least one filling port, at least one recirculation port, one vapor port, one outlet port and means for heating the reactor for the discontinuous polycondensation of a precondensate to obtain a polycondensation polymer with a dynamic viscosity in the range from about 100 to 1600 Pa·s at the respective polycondensation temperature, wherein a) the reactor comprises a housing the interior shape of which approximates that of a horizontal, single or double truncated cone tapered in the direction of both sides of the reactor wherein the taper is of different lengths on each side of the reactor, said truncated cone having a wall angle of inclination α in the range from 5 to 45°, the walls of which are optionally spherically curved, and optionally a coaxial cylindrical housing section adjoining the end or ends of the conical section or sections having the largest diameter, the outlet port being disposed in the section of the reactor having the largest diameter and at least one recirculation port being remote from the outlet port, b) the product entraining surfaces consist of a plurality of mutually parallel rotatable stirring discs, where the entraining surfaces are concentrated on the outer reactor region close to the wall, and the entraining-surface density in the vicinity of the outlet port is 1 to 8 m c) at least one stationary baffle plate is disposed centrally between two stirring discs, and d) the outlet port is connected with the at least one recirculation port via a product pump and at least one circulation line.