Method and device for producing polyesters, copolyesters and polycarbonates
First Claim
1. A method for the continuous production of polyesters, copolyesters or polycarbonates by the esterification of dicarboxylic acids or dicarboxylic acid esters and diols or by the transesterification of dialkylcarbonates or diarylcarbonates with bisphenols in at least one reaction stage, prepolycondensation of the esterification or reesterification product in at least one reaction stage and polycondensation of the precondensation product in at least one reaction stage, wherein at least one of the reaction stages, the supplied product stream before or within the reaction stage is subdivided into at least two partial streams and the partial streams are passed through the same reaction stage, entirely or partly, separately from one another.
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Accused Products
Abstract
In a process for producing polyester, the esterification of dicarboxylic acids and diols is carried out in at least one reaction stage, the prepolycondensation of the esterification product in at least one reaction stage and the polycondensation of the prepolycondensation product in at least one reaction stage. To increase the capacity of the apparatus forming one or more of the reaction stages in the production of the polyesters, at at least one of the reaction stages the supplied product system before it enters the reaction stage or within the reaction stage is divided into at least two partial streams and the partial streams entirely or partially separate from one another are passed through the reaction stage.
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Citations
19 Claims
- 1. A method for the continuous production of polyesters, copolyesters or polycarbonates by the esterification of dicarboxylic acids or dicarboxylic acid esters and diols or by the transesterification of dialkylcarbonates or diarylcarbonates with bisphenols in at least one reaction stage, prepolycondensation of the esterification or reesterification product in at least one reaction stage and polycondensation of the precondensation product in at least one reaction stage, wherein at least one of the reaction stages, the supplied product stream before or within the reaction stage is subdivided into at least two partial streams and the partial streams are passed through the same reaction stage, entirely or partly, separately from one another.
- 8. A device for carrying out the method for continuous production of polyesters, copolyesters or polycarbonates by esterification of dicarboxylic acids or dicarboxylic acid esters and diols or by transesterification of dialkylcarbonates for or diarylcarbonates with bisphenols in at least one reaction stage which is an esterification stage prepolycondensation of the esterification or transesterification product in at least one reaction stage which is a prepolycondensation stage and polycondensation of the prepolycondensation product in at least one reaction stage which is a polycondensation stage, whereby in at least one of the reaction stages the product stream supplied before or within the reaction stage is divided into at least two partial streams and the partial streams are passed through the same reaction stage entirely or partly separate from one another, wherein the reaction stage guiding the partial streams is a cascade reactor or a cage reactor which has at least two spatially separate sections divided into partial spaces through which the partial streams may flow separately one after the other.
Specification