Oligomeriser with an improved feed system
AssigneeSabic Global Technologies B.V.
InventorsIgnacio Vic Fernandez, Fernan Mateos Salvador, Surya Prakasa Rao Daliparthi
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Abstract
In an embodiment, a reactor for carrying out a melt transesterification reaction at a reactor temperature of 160 to 300° C. and a reactor pressure of 5 to 200 mbar, comprises a cylindrical tank comprising a top, a side, and a bottom, wherein the bottom is convex, extending away from the top; a stirring shaft disposed within the cylindrical tank along an axis thereof so that it is rotatable from outside of the cylindrical tank; a stirring blade extending from the stirring shaft in the cylindrical tank; a reactant solution inlet located on the bottom; and a reaction solution outlet located on the bottom. The reactor can be used for the polymerization of a polycarbonate oligomer.
Claims11
A method of melt polymerizing a polycarbonate, comprising:
- adding a precursor solution comprising a polycarbonate precursor through a reactant solution inlet of a reactor for carrying out a melt transesterification, said reactor comprising:
- a cylindrical tank comprising a top, a side, and a bottom, wherein the bottom is convex, extending away from the top;
- a stirring shaft disposed within the cylindrical tank along an axis thereof so that it is rotatable from outside of the cylindrical tank;
- a stirring blade extending from the stirring shaft in the cylindrical tank;
- a reactant solution inlet located on the bottom;
- and a reaction solution outlet located on the bottom;
- wherein the stirring shaft is disposed from a top of the cylindrical tank along the axis thereof;
- the reactant solution outlet is located on the bottom of the cylindrical tank and along the axis of the stirring shaft;
- and the reaction solution inlet is located on the bottom of the cylindrical tank at a location outside of a rotation column of the stirring blade;
- reacting the polycarbonate precursor at the reactor temperature of 160 to 300° C. and the reactor pressure of 5 to 200 mbar to form a mixed solution comprising a polycarbonate oligomer having a weight average molecular weight that is greater than that of the polycarbonate precursor;
- withdrawing the mixed solution from the reaction solution outlet;
- and
- polymerizing the polycarbonate oligomer to form the polycarbonate.
A method of melt polymerizing a polycarbonate, comprising:
- adding a precursor solution comprising a polycarbonate precursor through a reactant solution inlet of a reactor for carrying out a melt transesterification, said reactor comprising:
- a cylindrical tank comprising a top, a side, and a bottom, wherein the bottom is convex, extending away from the top;
- a stirring shaft disposed within the cylindrical tank along an axis thereof so that it is rotatable from outside of the cylindrical tank;
- a stirring blade extending from the stirring shaft in the cylindrical tank;
- a reactant solution inlet located on the bottom;
- and a reaction solution outlet located on the bottom;
- reacting the polycarbonate precursor at the reactor temperature of 160 to 300° C. and the reactor pressure of 5 to 200 mbar to form a mixed solution comprising a polycarbonate oligomer having a weight average molecular weight that is greater than that of the polycarbonate precursor;
- maintaining the reactor temperature via a plurality of heating coils located in the cylindrical tank that are supported by a plurality of supports;
- wherein an innermost diameter of the heating coils is greater than an outermost diameter of the stirring blade;
- withdrawing the mixed solution from the reaction solution outlet;
- and
- polymerizing the polycarbonate oligomer to form the polycarbonate.
Dependencies are inferred from the claim text.