Methods for preparing normal and overbased phenates

A calcium sulphurised alkyl phenate (I) of total base number (TBN) 50-150, substantially free of polyol promoter oxidation products, is prepd. by contacting (a) an alkyl phenol having at least one 3-36C alkyl substituent, (b) sulphur, (c) a promoter selected from 1-3C alkanoic acids, and mixtures th...

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Bibliographische Detailangaben
Hauptverfasser:	SMALL, VERNON R., JR, WILLIS, WILLIAM W., JR, LE COENT, JEAN LOUIS
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY FUELS INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATINGCOMPOSITIONS LUBRICANTS LUBRICATING COMPOSITIONS METALLURGY ORGANIC CHEMISTRY PEAT PERFORMING OPERATIONS PETROLEUM, GAS OR COKE INDUSTRIES PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL TECHNICAL GASES CONTAINING CARBON MONOXIDE THEIR RELEVANT APPARATUS TRANSPORTING USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION
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Beschreibung
Zusammenfassung:	A calcium sulphurised alkyl phenate (I) of total base number (TBN) 50-150, substantially free of polyol promoter oxidation products, is prepd. by contacting (a) an alkyl phenol having at least one 3-36C alkyl substituent, (b) sulphur, (c) a promoter selected from 1-3C alkanoic acids, and mixtures thereof with alkaline earth metal salts of alkanoic acids; and (d) a calcium base, in at least an amt. sufficient to neutralise (A) and the alkanoic acid at 130-250 [deg]C in absence of polyol promoter or 1-5C monohydric alcohol, for sufficient time to react essentially all the sulphur and produce (I) free of elemental sulphur. Also claimed is the prepn. of a calcium overbased sulphurised alkyl phenate (II) of TBN 200-350, substantially free of polyol promoter oxidation products, by contacting product (I) with carbon dioxide, and additional calcium base if required to provide the said TBN, in presence of a 2-6C alkylene glycol at 200-260 [deg]C.