Basf Aktiengesellschaft

Klaus Broellos

Klaus Volkamer

Alfred Lindner

Hans-Martin Weitz

Ulrich Wagner

Klaus-Juergen Schneider

Herbert Mueller

Werner Hefner

Gerhard Sandrock

Walter Mesch

1,2,4-Butanetriol is prepared by catalytic hydrogenation of malic esters over a copper-containing catalyst by passing the esters over the fixed-bed catalyst at from 130.degree. to 190.degree. C. under hydrogen partial pressures of from 100 to 300 bar while substantially avoiding the formation of a gas phase.

Preparation of 1,2,4-butanetriol

A C.sub.4 -hydrocarbon mixture which essentially contains n-butenes and butanes is separated by a process in which

Separation of a C.sub.4 -hydrocarbon mixture essentially containing

A process for isolating a conjugated diolefin from a C.sub.4 - or C.sub.5 -hydrocarbon mixture containing the diolefin, by single-stage or multi-stage extractive distillation using a selective solvent, wherein the selective solvent is a solvent mixture which comprises

Isolation of a conjugated diolefin from a C.sub.4 - or C.sub.5

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Seeheim-Jugenheim, Germany

Klaus Broellos