Process for preparation of cyclic carbonate

Details Process for preparation of cyclic carbonate Process for preparation of cyclic carbonate

2005-08-02

2005-08-02

Shameem, Golam M M (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S228000

Reexamination Certificate

active

06924379

ABSTRACT:
A catalytic system comprising of Zinc-substituted polyoxometalate, Na12[WZn3(H2O)2(ZnW9O34)2].48H2O and a Lewis base has been discovered to be efficient for chemical fixation of CO2with epoxides (I) to form cyclic carbonates of structure II as given below:wherein R is selected from a halogen atom, aliphatic and aromatic group. The reaction was carried out at moderate CO2pressure of 60 psig and in the temperature range 100-140° C. with very high turn number of more than 40,000, with nearly a quantitative conversion and 95-99% selectivity. The Zinc-substituted polyoxometalate catalyst is easy to separate after the reaction by filtration and reusable for many cycles. The reaction can be carried out without any solvent.

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patent: 5153333 (1992-10-01), Schubert et al.
patent: 5349077 (1994-09-01), Doya et al.
patent: 6384240 (2002-05-01), Machac, et al.

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