Process for preparing tetrahydrofuran

Details Process for preparing tetrahydrofuran Process for preparing tetrahydrofuran

C - Chemistry, Metallurgy

07

D

C07D 307/08 (2006.01)

Patent

CA 2064561

2064561 9101981 PCTABS00003 Separation of tetrahydrofuran (THF) from a mixture containing water, THF and a lower alkanol such as ethanol or methanol, is achieved by distillation in two zones, the vaporous mixture from the first zone being condensed and redistilled at a higher pressure in the second zone. Substantially pure THF is recovered from a lower part of the second zone, whilst the vapour from the top of the second zone is combined with the vapour from the first zone prior to condensation and the resulting condensate forms the liquid feed to the second zone. The process is suitable for recovering THF from complex reaction mixtures, containing also butane-1,4-diol and gamma-butyrolactone, obtained by hydrogenation of a dialkyl maleate.

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