Device for the synthesis of a polmer with extraction of a gaseous substance comprising a reaction chamber having at least one circular-cylindrical section

A process for synthesizing a polymer by polymerizing a prepolymer melt (6) to give a polymer melt (7) with separation of a gaseous substance (8) in an apparatus comprising

• a reaction space (1) comprising an essentially circular cylindrical upper section (11) which is bounded by two circular faces (111, 112) and one shell face (113) and has a longitudinal cylinder axis, and a lower section (12),
• an inlet orifice (2) disposed in a circular face (111, 112) or the shell face (113) of the upper section (11),
• a first outlet orifice (3) disposed in a wall of the lower section (12),
• a second outlet orifice (4) disposed in the shell face (113) of the upper section (11) opposite the first outlet orifice (3) and
• a removal device (5) which is disposed so as to be rotatable about the longitudinal cylinder axis and is in contact with both circular faces (111, 112) and the shell face (113), the removal device (5) taking the form of a rotor with several rotor blades (51), and which is immersed into the prepolymer melt (6), and wherein the cross section of the reaction space (1) which encloses at least one circular face (111, 112) of the upper section (11) is essentially droplet-shaped,
• having the following process steps:
• a) feeding a prepolymer melt (6) into a reaction space (1) through an inlet orifice (2),
• b) polymerizing the prepolymer melt (6) to give a polymer melt (7),
• c) removing the polymer melt (7) from the reaction space (1) through a first outlet orifice (3) in the reaction space (1), and
• d) removing a gaseous substance (8) from the reaction space (1) through a second outlet orifice (4) in the reaction space (1),
• wherein deposits on at least one inner wall of the reaction space (1) are removed by a removal device (5) immersed into the prepolymer melt (6), and transported into the prepolymer melt (6).