Basf Aktiengesellschaft

Wolfgang Muehlthaler

Hans Diem

Christian Dudeck

Gunter Lehmann

Werner Fliege

Karl-Heinz Ross

Guenther Matthias

Bernd Meissner

Norbert Petri

Heinrich Sperber

Dieter Merkel

Guenter Halbritter

Calcium propionate is prepared by passing a vaporous mixture of propionic acid and water into an aqueous solution containing calcium propionate and calcium hydroxide, with or without propionic acid.

Preparation of calcium propionate

Aliphatic hydroxycarbonyl compounds etherified with aliphatic groups are prepared by oxidizing hydroxyalcohols in the presence of a metal catalyst which consists of one or more layers, each of a particular weight and each containing particles of a particular size, the catalyst bed also having a particular total thickness, and the catalyst components used being silver and copper, with or without added copper/tin/phosphorus or silver alone. The etherified hydroxyaldehydes and hydroxyketones obtainable by the process of the invention are valuable starting materials for the preparation of dyes, pesticides, plastics and scents.

Manufacture of aliphatic hydroxycarbonyl compounds etherified with

Formaldehyde is prepared by oxidative dehydrogenation of methanol in the presence of a silver catalyst, specific amounts of steam and specific amounts of an off-gas, of a specific composition, taken from the manufacture of formaldehyde. The reaction is started at a lower throughput of methanol and at a lower temperature. The formaldehyde obtainable by the process is a disinfectant, tanning agent and reducing agent, and a starting material for the manufacture of synthetic resins, adhesives and plastics.

Manufacture of formaldehyde

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Hemsbach, Germany

Wolfgang Muehlthaler