Continuous production of 1,3-dioxolan-2-ones

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 317/36 (2006.01) C07D 317/38 (2006.01)

Patent

CA 2326888

The invention relates to a method for continually producing 1,3-dioxolan-2- ones such as ethylene carbonate or propylene carbonate by reacting a corresponding oxirane with carbon dioxide in liquid phase in the presence of a catalyst. The reaction is carried out in a two-part reactor. In the first part of the reactor, the reaction is carried out with back-mixing until a conversion rate of oxirane II of at least 80 % has been reached. In the second part, the reaction is completed under conditions without back-mixing, the carbon dioxide being guided to the oxirane II in a counterflow throughout the reactor.

L'invention concerne un procédé de préparation continue de 1,3-dioxolane-2-ones, tels que du carbonate d'éthylène ou du carbonate de propylène par réaction d'un oxirane correspondant avec du dioxyde de carbone en phase liquide en présence d'un catalyseur. La réaction s'effectue dans un réacteur à deux parties. Selon ce procédé, la réaction est effectuée dans la première partie par remélangeage jusqu'à obtention d'un taux de conversion de l'oxirane II d'au moins 80 %. Dans la seconde partie, la réaction est parachevée dans des conditions de non remélangeage, le dioxyde de carbone étant acheminé dans l'ensemble du réacteur à contre-courant jusqu'à l'oxirane II.

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