Method of preparing dichloropropanols from glycerine

C - Chemistry – Metallurgy – 07 – C

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C07C 29/62 (2006.01) C07C 31/36 (2006.01)

Patent

CA 2537131

A method of highly selective catalytic hydrochlorination of glycerine and/or monochloropropanediols to the dichloropropanol products 1,3-dichloro-2- propanol and 2,3~-dichloro-l-propanol, carried out in at least one continuous reaction zone at reaction temperatures in the range of 70-140 ~C and with continuous removing of the water of reaction, the liquid feed containing at least 50 % by weight of glycerine and/or monochloropropanediols. The method can be carried out in a continuously operating one-step circulation reactor or a cascade of continuous flow reactors of the liquid-gas type.

L'invention concerne une méthode d'hydrochloration catalytique hautement sélective de glycérine et/ou de monochloropropanediols, destinée à produire les produits du dichloropropanol: 1,3-dichloro-2-propanol et 2,3-dichloro-l-propanol. La méthode est mise en oeuvre dans au moins une zone de réaction continue, à des températures de réaction comprises entre 70 et 140 ·C, avec élimination continue de l'eau de réaction, le liquide d'alimentation contenant au moins 50 % en poids de glycérine et/ou de monochloropropanediols. La méthode peut être mise en oeuvre dans un réacteur de circulation en une étape à fonctionnement continu ou dans une cascade de réacteurs à débit constant de type liquid-gaz.

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