Abstract: Described is a continuous process for producing a polycarbonate in a plant comprising a mixing vessel, a pre-transesterification reactor, at least two transesterification reactors, at least one pre-polycondensation reacotr and a final polycondensation reactor mixing vessel to form a raw material melt, b) adding transesterification catalyst to the raw material melt to form a raw material melt mixture, c) pre-transesterfying the mw material melt mixture in the pre-transesterification reactor at a pressure of equal to or above 1 bar(a) to form a partially transesterified reaction mixture, d) continuing transesterification of the partially transesterified reaction mixture in the transesterification reactors at a pressure of below 1 bar(a) to form a transesterified reaction mixture, e) polycondensing the transesterified reaction mixture in the pre-polycondensation reactor(s) at a pressure of below 1 bar(a) to form a pre-polycondensation product, and f) continuing the polycondensation of the pre-polycondensation pr

Abstract: The invention relates to a method for producing a polycarbonate and the reaction of one or more diaryl carbonates with one or more aromatic compounds, wherein a catalyst combination is used in the process. The invention further relates to a catalyst combination and to the use thereof in a process for producing a polycarbonate.

Abstract: A method is described for producing a polycarbonate by reacting one or more diaryl carbonates with one or more aromatic hydroxy compounds, which are first mixed in a mixing device and enter, as a raw material mixture, a raw material mixture container to subsequently react in one or more reactors under reduced pressure and increased temperature to form polycarbonate, wherein the mixture of diaryl carbonate and aromatic hydroxy compound is subjected to a purification by an inert gas in a countercurrent process, in a stripping device, before entering the raw material mixture container. The present invention also relates to a stripping device which is particularly suitable for purifying a raw material mixture stream, and to the use of such a stripping device in a method for producing polycarbonate.

Abstract: The invention relates to a method for producing a polycarbonate and the reaction of one or more diaryl carbonates with one or more aromatic compounds, wherein a catalyst combination is used in the process. The invention further relates to a catalyst combination and to the use thereof in a process for producing a polycarbonate.

Abstract: A method is described for producing a polycarbonate by reacting one or more diaryl carbonates with one or more aromatic hydroxy compounds, which are first mixed in a mixing device and enter, as a raw material mixture, a raw material mixture container to subsequently react in one or more reactors under reduced pressure and increased temperature to form polycarbonate, wherein the mixture of diaryl carbonate and aromatic hydroxy compound is subjected to a purification by an inert gas in a countercurrent process, in a stripping device, before entering the raw material mixture container. The present invention also relates to a stripping device which is particularly suitable for purifying a raw material mixture stream, and to the use of such a stripping device in a method for producing polycarbonate.

Abstract: The invention relates to a method for producing a polycarbonate comprising at least the following steps: a) transesterification of one or more bisphenols with one or more diaryl carbonates in at least one transesterification reactor under continuous removal of the hydroxy aryl reaction product released, b) pre-polycondensation of the reaction product of the transesterification in at least one pre-polycondensation reactor under continuous removal of the hydroxy aryl reaction product released, c) polycondensation of the reaction product of the pre-polycondensation in at least one polycondensation reactor, wherein the aryl reaction product is removed during the transesterification reaction and the hydroxy aryl reaction product is removed during the pre-polycondensation reaction through a common column, wherein entrained diaryl carbonate is separated from the hydroxy aryl reaction product drawn off.

Abstract: The invention relates to a method for producing a polycarbonate comprising at least the following steps: a) transesterification of one or more bisphenols with one or more diaryl carbonates in at least one transesterification reactor under continuous removal of the hydroxy aryl reaction product released, b) pre-polycondensation of the reaction product of the transesterification in at least one pre-polycondensation reactor under continuous removal of the hydroxy aryl reaction product released, c) polycondensation of the reaction product of the pre-polycondensation in at least one polycondensation reactor, wherein the aryl reaction product is removed during the transesterification reaction and the hydroxy aryl reaction product is removed during the pre-polycondensation reaction through a common column, wherein entrained diaryl carbonate is separated from the hydroxy aryl reaction product drawn off.

Abstract: A modular device for the continuous degas sing of reaction products, such as of a carboxylic acid or a polycarboxylic acid with a multi-functional alcohol suitable for application in the production of precondensates (or also prepolymers), has a heated enclosure in which a plurality of modules are stacked one above the other, each said module having a base. There is a vapor inlet to the uppermost module and a discharge port at the lower most module with at least one module intermediate the uppermost and lowest modules to provide space for expansion of the vapor. The base of each module preferably is concave and there are conduits that provide flow communication between the modules.

Abstract: A device for degassing a flowable, viscous and pasty product includes a reactor having a product inlet and a product discharge outlet. A plurality of rotors each defining a reaction zone are located side-by-side in the reactor and a separate driving system mounted outside of the reactor for rotating each rotor with each driving system being an hydraulic system.

Abstract: A device for degassing a flowable, viscous and pasty product includes a reactor having a product inlet and a product discharge outlet. A plurality of rotors each defining a reaction zone are located side-by-side in the reactor and a separate driving system mounted outside of the reactor for rotating each rotor with each driving system being an hydraulic system.

Abstract: A modular device for the continuous degassing of reaction products, such as of a carboxylic acid or a polycarboxylic acid with a multi-functional alcohol suitable for application in the production of precondensates (or also prepolymers), has a heated enclosure in which a plurality of modules are stacked one above the other, each said module having a base. There is a vapor inlet to the uppermost module and a discharge port at the lower most module with at least one module intermediate the uppermost and lowest modules to provide space for expansion of the vapor. The base of each module preferably is concave and there are conduits that provide flow communication between the modules.

Abstract: Distributors for viscous fluids, consisting of a central inlet line and at least two valves that are connected radially to the inlet line, each valve having one valve spindle that moves in the axial direction in the cylindrical valve casing and an outlet opening that opens into an outlet line, whereby a flow displacer having a cylindrical bottom part and a conical top part is inserted centrally into the inlet line at the level of the valves, forming a ring gap, and where the cross section of flow is constricted in the outlet opening and then immediately thereafter is enlarged in the outlet line.