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AssigneeMitsubishi Chemical Corporation
InventorsKazuyuki Takahashi, Ryuuji Uchimura, Toshiyuki Hamano, Masaaki Miyamoto, Kodama Miyamoto, Taro Miyamoto, Hideo Miyamoto, Hanae Miyamoto
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The present invention relates to a production apparatus of a polycarbonate resin in which generation of adherents or foreign matters in a polymerization tank is reduced, and a production method of a polycarbonate resin in which crystallized foreign matters or burned foreign matters are reduced, by melt method. The present invention relates to a continuous production apparatus of a polycarbonate resin using a plurality of polymerization tanks, wherein when supplying a molten reactant to a liquid phase in a polymerization tank, or supplying the molten reactant to a gas phase in the polymerization tank by an insertion pipe, in at least one polymerization tank, and/or producing a polycarbonate resin by an ester exchange reaction between an aromatic dihydroxy compound and a carbonic diester by using three vertical polymerization tanks and one horizontal polymerization tank, equipped with a stirring device, a wall surface temperature T of a distillation pipe 10c is set to a temperature higher than a boiling point t1 of by-produced phenol such that the relationship of the boiling t1 of the by-produced phenol under a pressure in at least a third vertical polymerization tank 14, the wall surface temperature T of the distillation pipe 10c and an inner temperature t2 of the third vertical polymerization tank 14 is satisfied with the formula (1). t1<T≦t2 (1)
A production apparatus for a polycarbonate resin, wherein in a continuous production of a polycarbonate resin using a plurality of polymerization tanks, a molten reactant is supplied in a liquid phase to at least one polymerization tank, or is supplied in a gas phase part to the at least one polymerization tank through an insertion pipe.
A production method for a polycarbonate resin which comprises a method of producing a polycarbonate resin by an ester exchange reaction between an aromatic dihydroxy compound and a carbonic diester, which is characterized by having a raw material preparation step of preparing a molten mixture of raw materials of at least one of an aromatic dihydroxy compound and a carbonic diester, and a polycondensation step of continuously polycondensing the raw material molten mixture prepared by the raw material preparation step in the presence of a ester exchange catalyst using a plurality of polymerization tanks, wherein the polycondensation step takes place in at least one polymerization tank, a molten reactant by an ester exchange reaction is directly supplied in a liquid phase part in the polymerization tank, or is supplied to a gas phase part in the polymerization tank through an insertion pipe having an opening at the gas phase part in the polymerization tank.
A production method for a polycarbonate resin which comprises a method of producing a polycarbonate resin by an ester exchange reaction between an aromatic dihydroxy compound and a carbonic diester, which is characterized in that the relationship of a boiling point t1 (° C.) of a by-produced monohydroxy compound under a pressure in a reactor which conducts an ester exchange reaction, a wall surface temperature T (° C.) of a distillation pipe which distills a by-produced monohydroxy compound from the reactor, and an inner temperature t2 (° C.) in the reactor is satisfied with the following formula (1)
A production method for a polycarbonate resin, wherein in conducting a continuous ester exchange reaction between an aromatic dihydroxy compound and a carbonic diester using a polymerization apparatus having a plurality of vertical polymerization tanks which are connected in series, at least one horizontal polymerization tank connected to the vertical polymerization tanks, and a distillation pipe provided at the upper portion of the at least one vertical polymerization tank, which distills a monohydroxy compound by-produced in the ester exchange reaction from the polymerization tank, a boiling point t1 (° C.) of a by-produced monohydroxy compound under a pressure in the vertical polymerization tank, an inner temperature t2 (° C.) in the vertical polymerization tank, and a wall surface temperature T (° C.) of the distillation pipe are satisfied with the following formula (3)
Dependencies are inferred from the claim text.