Glycerol polycarbonate, organic compositions containing same and method for obtaining said compositions

Method for catalytic production of an organic composition, including a glycerol carbonate, in a mixture at least one compound selected from the group consisting of polyglycerols, [(α-hydroxymethyl)oxyethylene/(α-hydroxymethyl ethylene carbonate) copolymers;

• [(α-alkyl)oxyethylene/(α-alkyl)ethylene carbonate] copolymers, [(α-alkyl)oxyethylene/(α-hydroxyalkyl)oxyethylene] copolymers, glycerol carbonate and/or other organic carbonates, glycerol and/or other co-produced and residual compounds, said method comprising catalytic polymerisation in a heterogeneous reaction medium comprising an organic liquid phase made up of at least one compound providing hydroxyl functions and at least one compound providing carbonate functions, a solid phase that may be solubilised, formed by a catalyst containing active sites in the Lewis and/or Bronsted sense and an ambient gaseous phase, with the reaction medium being heated, the catalytic polymerisation further comprising:
• in a first step, bringing the heterogeneous reaction medium to a temperature no higher than 160° C., subjecting the reaction medium and the ambient gaseous phase to a pressure equal to at least 105 Pa, while controlling the flow of gaseous or liquid reaction co-products, throughout said step,
• in a second step, when the emission of CO2 begins, bringing the heterogeneous reaction medium to a temperature equal to at least the final temperature of the first step, subjecting the gaseous phase containing CO2 generated in situ to a pressure equal to at least 2.5×103 Pa while controlling nascent gaseous emission.