C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 68/06 (2006.01) C07C 69/96 (2006.01)
Patent
CA 2638070
A process for the preparation of an alkanediol and a dialkyl carbonate is provided, which process comprises: (a) contacting an alkylene carbonate with an alkanol feedstock under transesterification conditions in a reactive distillation column to obtain an upwardly moving stream comprising dialkyl carbonate and the alkanol and a downwardly moving stream comprising the alkanediol; (b) recovering the alkanediol at the bottom of the column; (c) withdrawing a dialkyl carbonate- and alkanol-containing product stream at the upper part of the column, which upper part is below the top of the column; and (d) removing lower-boiling compounds at the top of the column.
La présente invention concerne un procédé de préparation d'un alcanediol et d'un carbonate de dialkyle, ledit procédé comprenant: (a) la mise en contact d'un carbonate d'alkylène avec une charge d'alcanol dans des conditions de transestérification dans une colonne de distillation réactive en vue d'obtenir un flux ascendant comprenant du carbonate de dialkyle et l'alcanol et un flux descendant comprenant l'alcanediol; (b) la récupération de l'alcanediol au pied de la colonne; (c) le retrait d'un flux de produit contenant du carbonate de dialkyle et de l'alcanol dans la partie supérieure de la colonne, ladite partie supérieure étant sous la tête de la colonne; et (d) le retrait de composés à bas point d'ébullition au niveau de la tête de la colonne.
Nisbet Timothy Michael
Van Der Heide Evert
Shell Internationale Research Maatschappij B.v.
Smart & Biggar
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