Process for preparing tetrahydrofuran from dialkoxybutenes

Details Process for preparing tetrahydrofuran from dialkoxybutenes Process for preparing tetrahydrofuran from dialkoxybutenes

C - Chemistry, Metallurgy

07

D

C07D 307/08 (2006.01) C07C 41/01 (2006.01) C07C 41/26 (2006.01) C07C 43/10 (2006.01) C07C 43/15 (2006.01)

Patent

CA 2257928

The invention concerns a process for preparing tetrahydrofuran by reacting 1,4- butene diol diethers of formulae (I) -RO-CH2-CH=CH-CH2-OR and/or (II) -RO-CH2- CH2=CH-CH2-OR, in which the R groups can be identical or different and stand for C1-C15 alkyl or cycloalkyl groups, C6-C12 aryl groups or C7-C15 aralkyl groups, with water and hydrogen at temperatures of between 20 and 300 ~C and a pressure of between 1 and 300 bar in the presence of catalysts or catalyst combinations which both contain components which can hydrogenate and comprise acid or basic centres. The invention further concerns a novel process for preparing the 1,4-butene diol diethers of formula (I) by metathesis.

L'invention concerne un procédé de préparation de tétrahydrofurane par réaction de diéthers de 1,4-butène-diol des formules (I) -RO-CH¿2?-CH=CH-CH¿2?-OR et (II) -RO-CH¿2?-CH¿2?=CH-CH¿2?-OR dans lesquelles les restes R peuvent être identiques ou différents et désignent des restes alkyle C¿1?-C¿15? ou cycloalkyle, des restes C¿6?-C¿12? ou des restes aralkyle C¿7?-C¿15?, avec de l'eau et de l'hydrogène à des températures comprises entre 20 et 300 ·C et à une pression comprise entre 1 et 300 bar, en présence de catalyseurs ou de combinaisons de catalyseurs qui contiennent aussi bien des constituants pouvant être hydrogénés que des centres acides ou basiques. L'invention concerne en outre un nouveau procédé permettant de préparer des diéthers de 1,4-butène-diol de la formule (I) par métathèse.

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