DEVICE AND METHOD FOR DEGASSING SOLVENT-CONTAINING POLYCARBONATE SOLUTIONS

摘要

The device has a down pipe evaporator (15) combined with an evaporating extruder i.e. double screw extruder. The down pipe evaporator is directly arranged over the extruder, and water vapor lines (17) are attached to the down pipe evaporator. The evaporator consists of a tube bundle-heat exchanger with tubes, which are heated outwardly. The extruder comprises degassing zones in a conveyor direction. The down pipe evaporator is heated by condensed water vapor by a condensed organic heat medium or a fluid organic heat medium. An independent claim is also included for a method for removing gas from polycarbonate solutions containing solution.