PROCESS FOR PREPARING A SALT OF A SULFURIZED ALKYL-SUBSTITUTED HYDROXYAROMATIC COMPOSITION

摘要

Disclosed herein is a process for preparing a salt of a sulfurized alkyl-substituted hydroxyaromatic composition and the process involves the steps of: (a) providing a composition comprising (i) a salt of a sulfurized alkyl-substituted hydroxyaromatic compound; (ii) an unsulfurize'd alkyl-substituted hydroxyaromatic compound and (iii) an unsulfurized metal salt of the alkyl-substituted hydroxyaromatic compound;wherein the alkyl-substituted hydroxyaromatic compound is derived from alkylation of a hydroxyaromatic compound with one or more olefins comprising C9 to C18 oligomers of monomers selected from propylene, butylene or mixtures thereof; (b) protonating the unsulfurized metal salt of the alkyl-substituted hydroxyaromatic compound with an acidic compound capable of protonating the unsulfurized metal salt of the alkyl-substituted hydroxyaromatic compound; and ( c) removing the unsulfurized alkyl-substituted hydroxyaromatic compound and the protonated unsulfurized metal salt of the alkyl-substituted hydroxyaromatic compound from the composition.