Method and apparatus for producing aromatic polycarbonate

A production system for producing an aromatic polycarbonate by melt-polycondensing an aromatic dihydroxy compound and a carbonic acid diester in the presence of a catalyst continuously, the system comprising:

• a plurality of polycondensation vessels connected to each other in series,
• an extrusion die connected to the lowest downstream polycondensation vessel via a polymer filter, and
• pipes between all the polycondensation vessels and between the lowest downstream polycondensation vessel and the extrusion die,
• wherein all the pipes except for one between first and second upstream polycondensation vessels have a self-lubricating gear pump and also have valves, bends and detecting probes such that a total of flow inhibition strengths become 10 or less,
• provided that flow inhibition strength per valve or bend is 1 and flow inhibition strength per detecting probe is 0.5.

A production system for producing an aromatic polycarbonate by melt-polycondensing an aromatic dihydroxy compound and a carbonic acid diester in the presence of a catalyst continuously, the system comprising:

• a plurality of polycondensation vessels connected to each other in series,
• an extruder connected to the lowest downstream polycondensation vessel,
• an extrusion die connected to the extruder via a polymer filter, and
• pipes between all the polycondensation vessels, between the lowest downstream polycondensation vessel and the extruder and between the extruder and the extrusion die,
• wherein all the pipes except for one between first and second upstream polycondensation vessels have a self-lubricating gear pump and also have valves, bends and detecting probes such that a total of flow inhibition strengths become 10 or less,
• provided that flow inhibition strength per valve or bend is 1 and flow inhibition strength per detecting probe is 0.5.

A production system for producing an aromatic polycarbonate, the system comprising:

• an extruder,
• an extrusion die, and
• a pipe which connects the extruder and the extrusion die with each other via a polymer filter and has valves, bends and detecting probes such that a total of flow inhibition strengths become 10 or less,
• provided that flow inhibition strength per valve or bend is 1 and flow inhibition strength per detecting probe is 0.5.