Basf Aktiengesellschaft

Juergen Dehler

Matthias Schwarzmann

Wolf D Mross

Herwig Hoffmann

Siegfried Winderl

Wolfgang Reiss

Ladislaus Meszaros

Klaus Pfitzner

Juergen Plueckhan

Hans-Ingo Joschek

Rudolf Schnur

Juergen Plueckham

Phosphate-containing, glycol-based coolant mixtures which are stable in hard water and are free of nitrites, silicates, amines and borates contain

Phosphate containing coolant mixtures which are stable in hard water

The Al.sub.2 O.sub.3 carrier material from Ag/Al.sub.2 O.sub.3 supported catalysts which is obtained after the silver has been removed from such spent catalysts in a conventional manner is regenerated by a method in which the carrier material

Regeneration of the Al.sub.2 O.sub.3 carrier material of a spent

The subject invention relates to a process for regenerating silver-containing carrier catalysts used in the preparation of ethylene oxide which comprises treating a deactivated catalyst with a solution comprising a potassium, rubidium, or cesium compound and a reducing agent. The subject process provides improved catalyst regeneration.

Process for regenerating silver-containing carrier catalysts for the

Butynediol is prepared by reacting acetylene and formaldehyde in contact with a heavy metal acetylide as catalyst, in the liquid phase by the Reppe method. Acetylene is fed upwardly through a suspension of the catalyst in formaldehyde at such a rate that it is virtually completely consumed and a liquid zone containing no catalyst is formed above the suspension.

Manufacture of butynediol

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Neuhofen, Germany

Juergen Dehler