Method for producing mixtures of 1,4-butanediol,...

Details Method for producing mixtures of 1,4-butanediol,... Method for producing mixtures of 1,4-butanediol,...

C - Chemistry, Metallurgy

07

C

C07C 29/17 (2006.01) C07C 29/136 (2006.01) C07C 29/149 (2006.01) C07C 51/16 (2006.01) C07C 67/08 (2006.01) C07D 307/08 (2006.01) C07D 307/33 (2006.01) C07C 31/20 (2006.01) C07C 69/60 (2006.01)

Patent

CA 2329353

The invention relates to a method for producing 1,4-butanediol, tetrahydrofuran and .gamma.-butyrolactone by oxidation of butane to a product flow containing maleic anhydride, absorption of maleic anhydride from the product flow with a high-boiling alcohol, which yields a liquid absorption product containing maleic acid half- and diesters and high- boiling alcohol, post-esterification of the liquid absorption product and subsequent hydrogenation of the post-esterified product in the liquid phase. The high-boiling alcohol is a polyvalent alcohol with a boiling point at normal pressure of more than 233 °C and the post-esterified product has an acid value of less than 30 mg KOH/g and a water content of less than 1 weight %.

L'invention concerne un procédé pour la préparation de 1,4-butandiol, tétrahydrofurane et gamma -butyrolactone par oxydation de butane en vue de donner un flux de produit contenant de l'anhydride maléique, absorption de l'anhydride maléique, contenu dans le flux de produit, avec un alcool à haut point d'ébullition, un extrait d'absorption liquide étant obtenu et contenant des monoesters et des diesters d'acide maléique ainsi que l'alcool à haut point d'ébullition, post-estérification de l'extrait d'absorption liquide et hydrogénation subséquente de l'extrait post-estérifié en phase liquide, l'alcool à haut point d'ébullition étant un alcool multivalent avec un point d'ébullition à la pression normale supérieur à 233 DEG C, et l'extrait post-estérifié présentant un indice d'acidité inférieur à 30 mg KOH/g et une teneur en eau inférieure à 1 % en poids.

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