Methods for preparing 1,3-butylene glycol

C - Chemistry – Metallurgy – 07 – C

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C07C 29/141 (2006.01)

Patent

CA 2551682

1,3 butylene glycol, prepared through an intermediate aldol condensation reaction of acetaldehyde, is produced at increased yield efficiencies. The efficiencies are achieved by utilizing an acetaldehyde having low carboxylic concentrations. The aldol condensation takes place in the presence of an alkali agent at a concentration of about 2 ppm to about 10 ppm to produce a 3- hydroxybutanal intermediate product that is hydrogenated in the presence of a Raney nickel catalyst to yield 1,3 butylene glycol at efficiency yields of greater than about 75%.

L'invention concerne du 1,3 butylène glycol, préparé par le biais d'une réaction de condensation d'aldol intermédiaire d'acétaldéhyde, produit avec des économies de rendement amélioré. Les économies sont réalisées par utilisation d'un acétaldéhyde possédant de faibles concentrations carboxyliques. La condensation d'aldol s'effectue en présence d'un agent alcalin à une concentration d'environ 2 ppm à environ 10 ppm afin de produire un produit intermédiaire de 3-hydroxybutanal qui est hydrogéné en présence d'un catalyseur de nickel de Raney afin de produire du 1,3 butylène glycol à un rendement supérieur à environ 75 %.

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