Organisation Nationale Interprofessionelle Des Oleagineux (o.n.i.d.ol.)

Organisation Nationale Interprofessionnelle Des Oleagineux (o.n.i.d.ol.)

Jeong-Woo Yoo

Antoine Gaset

Zephirin Mouloungui

Sylvain Claude

Z&eacute;phirin Mouloungui

The invention concerns a method for preparing an epoxide, in particular glycidol, wherein a cyclic organic carbonate, in particular glycerol carbonate, is heated under reduced pressure so as to carry out a reaction to contract the carbonate ring into an epoxide ring. According to the present invention, the reaction is carried out in a solid/liquid system in the presence of a polyol and a solid catalyst consisting of a type A zeolite or &ggr;-alumina. The method, which may be carried out continuously, enables the epoxide to be formed in a single step, the epoxide being exhausted in the form of vapor which only has to be extracted and separated from the carbon dioxide formed.

Method for producing an epoxide, in particular of glycidol, and installation for implementation

The invention concerns a method for preparing glycerol carbonate. This method consists of making urea and glycerol react at a temperature substantially between 90.degree. C. and 220.degree. C. in the presence of a catalyst bearing Lewis acid sites, in particular metallic or organometallic salts or supported metallic compounds. The invention enables glycerol carbonate to be obtained, by a catalytic carbamoylation/carbonation reaction, in a highly pure state under economic conditions.

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Toulouse, France

Jeong-Woo Yoo