Method for producing 1,4-butanediol

C - Chemistry – Metallurgy – 07 – C

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C07C 29/17 (2006.01) C07C 51/16 (2006.01) C07C 67/03 (2006.01) C07D 307/08 (2006.01) C07D 307/33 (2006.01) C07C 31/20 (2006.01) C07C 69/60 (2006.01)

Patent

CA 2329477

The invention relates to a method for producing 1,4-butanediol and possibly .gamma.-butyrolactone and tetrahydrofurane by oxidation of butane or benzol into a product flow containing maleic anhydride, absorption of maleic anhydride from the product flow by means of an inert, high-boiling solvent in an absorption stage, which yields a liquid absorption product, and esterification of said liquid absorption product with a C1-C5 esterification alcohol in an esterification step, yielding an esterification product containing the corresponding diester and high-boiling inert solvent. This is followed by hydrogenation of the esterification product, which results in an hydrogenation product containing the products 1,4-butanediol and optionally .gamma.-butyrolactone and tetrahydrofurane as well as the esterification alcohol. The hydrogenation product is separated by distillation into the products and the esterification alcohol and the esterification alcohol is returned to the esterification zone. Prior to hydrogenation the esterification product is separated by distillation under reduced pressured into the diester and the inert solvent, the inert solvent is returned to the absorption stage and the diester is hydrogenated in the liquid phase on a fixed-bed catalyst.

L'invention concerne un procédé pour la production de 1,4-butanediol et éventuellement de gamma -butyrolactone et de tétrahydrofurane par oxydation de butane ou de benzène pour obtenir un flux de produit contenant de l'anhydride maléique, absorption de l'anhydride maléique, contenu dans ce flux de produit, avec un solvant inerte à haut point d'ébullition, dans un étage d'absorption, un extrait d'absorption liquide étant obtenu, estérification de cet extrait d'absorption liquide avec un alcool d'estérification C1-C5, dans un étage d'estérification, pour obtenir un extrait d'estérification contenant le diester correspondant et le solvant inerte à haut point d'ébullition, hydrogénation subséquente de cet extrait d'estérification, un extrait d'hydrogénation étant obtenu, lequel contient les produits 1,4-butanediol et éventuellement gamma -butyrolactone et tétrahydrofurane, ainsi que l'alcool d'estérification, ledit extrait d'estérification est séparé par distillation dans lesdits produits et l'alcool d'estérification, et ce dernier est ramené dans la zone d'estérification, l'extrait d'estérification étant, avant l'hydrogénation, séparé sous pression réduite par distillation dans le diester et le solvant inerte. Ce dernier est ramené à l'étage d'absorption et le diester est hydrogéné en phase liquide sur un catalyseur à lit fixe.

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