Reactive extrusion process with partial condensor and reflux

C - Chemistry – Metallurgy – 08 – F

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C08F 8/14 (2006.01)

Patent

CA 2431223

An esterification or transesterification process comprises the steps of reacting a first polymer with a first alcohol as a by-product. The second alcohol has a lower boiling point than the first alcohol, preferably at least about 100~ C lower. A gas stream is vented from the extruder apparatus that comprises both the first alcohol and the second alcohol, At least part of the first alcohol condensed from the gas stream, thereby forming a liquid stream, which is then fed back into the reactive extruder. The condensed first alcohol then continues to further the extent of the reaction in the extruder producing the second polymer.

Un processus d'estérification ou de transestérification comprend des étapes qui consistent à faire réagir un premier polymère avec un premier alcool dans une extrudeuse réactive pour produire un deuxième polymère ainsi qu'un deuxième alcool lequel fait office de sous-produit. Le deuxième alcool présente un point d'ébullition plus faible que le premier alcool, qui est de préférence inférieur d'au moins 100 ·C environ. Un flux gazeux est évacué de l'appareil d'extrusion qui comprend le premier et le deuxième alcools. Au moins une partie du premier alcool est condensée dans le flux gazeux, ceci formant un flux liquide qui est ensuite renvoyé dans l'extrudeuse réactive. Le premier alcool condensé continue ensuite à participer à la réaction dans l'extrudeuse produisant le deuxième polymère.

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