| 摘要 |
<p>The present invention concerns a process for preparing of alkylene carbonates, and more particularly it relates to a process for the direct preparation of alkylene carbonates from olefines. More particularly, the present invention relates to a direct process for the preparation of alkylene carbonates, characterized in that an olefine selected from the group consisting of linear olefines and cyclic olefines having from 2 to 15 carbon atoms is reacted in a liquid phase with carbon dioxide in the presence of a gas selected from the group of oxygen and air and in the presence of a catalytic system consisting of: (a) iodine in a form selected from the group consisting of elementary iodine, alkali metal iodides, alkaline earth metal iodides, iodides of a metal selected from the group consisting of groups IB, IIB, IIIA, IIIB, IVA, VA, VIIB, and VIII of the periodic table and iodohydrines of the olefine reactant, and of (b) an oxygen conveyor selected from the group consisting of manganese dioxide, nitrites, nitrates, nitrogen oxides and a cobalt complex; at a temperature between 30.degree. and 120.degree.C., and at a pressure between atmospheric pressure to 100 atmospheres, and at a pH value between 3 and 8.</p> |
