Naphthensäuren und Naphthensulfosäuren

Naphthenic Acids. II. Manufacture, Properties, and Uses.

“…The true naphthenic acids are probably normal constituents of all crude oils, in which they occur to the extent of about 0.03 to 3.0 per cent (52,54,64,78,82). By using an average acid content of 0.1 per cent, Ellis (26) has estimated the potential annual production at 50,000 tons or 12,000,000 gallons.…”