Process for the preparation of propylene glycol carbonate

Details Process for the preparation of propylene glycol carbonate Process for the preparation of propylene glycol carbonate

C - Chemistry, Metallurgy

07

C

C07C 68/04 (2006.01) C07C 69/96 (2006.01) C07D 317/36 (2006.01)

Patent

CA 2125075

A process is described far the catalytic preparation of propylene glycol carbonate (PGC) by reacting propylene oxide (POX) and CO2 in PGC as reaction medium at elevated temperature and elevated pressure and separating off from the catalyst the PGC formed. The process is carried out continuously under adiabatic temperature conditions. Per unit of time, PGC as reaction medium flows into the reactor at 7 to 350 times the amount of the PGC formed per unit of time. At all points of the reactor a CO2 excess is maintained over the other reaction partner POX. Of the effluent reaction mixture, 80 to 98 % by weight are returned to the entrance of the reactor, while the remainder is worked up to give PGC. The sensible heat of the reaction product resulting from the adiabatic temperature conditions can be used for the work-up.

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