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AssigneeBayer Aktiengesellschaft
InventorsPaul Wagner, Christine Mendoza-Frohn, Hans-Josef Buysch
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A bubble column reactor is described which is characterized by a slenderness ratio at a ratio of height to diameter of 2 to 50, a feed, at the bottom end of the bubble column, for the ethylene glycol carbonate (EGG) or propylene glycol carbonate (PGC) already present serving as reaction medium, one or more metering sites for the starting materials CO.sub.2 and ethylene oxide (EOX) or propylene oxide (POX) above the feed for the reaction medium, an outlet for the reaction mixture at the top end of the bubble column, a dividing apparatus connected thereto for the reaction mixture flowing off for dividing it into reaction mixture to be taken off and worked up on the one hand and reaction mixture to be recycled on the other hand and additionally a return line to the feed for the reaction mixture to be recycled. This bubble column reactor can be advantageously used in a process for the continuous preparation of EGG or PGC which is carried out in the temperature range from 100.degree. to 200.degree. C., in the pressure range from 5 to 200 bar and at a molar ratio of 1.01 to 1.5 mol of CO.sub.2 per mol of alkylene oxide in EGG or PGC already present as reaction medium in an amount which is 7 to 350 times that of the newly formed EGG or PGC.
A reactor for the continuous preparation of ethylene glycol carbonate (EGC) or propylene glycol carbonate (PGC) from CO.sub.2 and ethylene oxide (EOX) or propylene oxide (POX), respectively, in EGC or PGC, respectively, already present as reaction medium, in the form of a bubble column, characterized by a) a slenderness ratio as ratio of height to diameter of 2 to 80, b) a feed, at the bottom end of the bubble column, for the EGC or PGC, already present serving as reaction medium, c) one or more metering sites for the starting materials CO.sub.2 and EOX or POX above the feed b), d) an outlet for the reaction mixture at the top end of the bubble column, e) a dividing device connected to d) for the reaction mixture flowing off for dividing it into reaction mixture to be taken off and worked up and reaction mixture to be recycled and f) a return line and to the feed b) for the reaction mixture to be recycled.
A process for the continuous preparation of ethylene glycol carbonate (EGC) or propylene glycol carbonate (PGC) by reaction of ethylene oxide (EOX) or propylene glycol oxide (POX), respectively, with 1.01 to 1.5 mol of CO.sub.2 per mol of the alkylene oxide in the temperature range from 100.degree. to 200.degree. C. and in the pressure range from 5 to 200 bar in the EGC or PGC to be formed as reaction medium in an amount which is 7 to 350 times that of the newly formed EGC or PGC, wherein a bubble column reactor with a) a slenderness ratio of height to diameter of 2 to 80, b) a feed, at the bottom end of the bubble column, for the EGC or PGC, already present serving as reaction medium, c) one or more metering sites for the starting materials CO.sub.2 and EOX and POX above the feed b), d) an outlet for the reaction mixture at the top end of the bubble column, e) a dividing device connected to d) for the reaction mixture flowing off for dividing it into reaction mixture to be taken off and worked up and reaction mixture to be recycled and f) a return line to the feed b) for the reaction mixture to be recycled is used for the reaction.
Dependencies are inferred from the claim text.