Alkylation and acylation reactions

Details Alkylation and acylation reactions Alkylation and acylation reactions

C - Chemistry, Metallurgy

07

B

C07B 37/02 (2006.01) B01J 3/00 (2006.01) C07B 37/04 (2006.01) C07C 2/66 (2006.01) C07C 2/86 (2006.01) C07C 41/30 (2006.01) C07C 45/46 (2006.01)

Patent

CA 2265777

Method of performing alkylation or acylation reactions of aromatic substrates under supercritical or near-critical reaction conditions. In particular, a method of performing Friedel-Crafts alkylation or acylation reactions is disclosed under those conditions. Friedel-Crafts reactions may be effected using a heterogeneous catalyst in a continuous flow reactor containing a supercritical or near-critical reaction medium. Selectivity of product formation can be achieved by varying one or more of the temperature, pressure, catalyst, flow rates and also by varying the ratios of aromatic substrate to acylating or alkylating agent.

Procédé permettant d'effectuer des réactions d'alkylation ou d'acylation de substrats aromatiques dans des conditions supercritiques ou quasi critiques. Cette invention concerne plus particulièrement un procédé permettant d'effectuer des réactions d'alkylation ou d'acylation du type Friedel-Crafts dans ces mêmes conditions. On peut effectuer des réactions du type Friedel-Crafts à l'aide d'un catalyseur hétérogène dans un réacteur à flux continu contenant un milieu réactionnel supercritique ou quasi critique. On peut obtenir une sélectivité de la formation du produit en faisant varier un ou plusieurs paramètres tels que la température, la pression, le catalyseur, les débits ainsi que les rapports entre le substrat aromatique et l'agent d'acylation ou d'alkylation.

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