Process for preparing a salt of a sulfurized alkyl-substituted hydroxyaromatic composition
US8772209B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 2012 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Nov 20, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2070/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed herein is a process for preparing a salt of a sulfurized alkyl-substituted hydroxyaromatic composition having a reduced content of unsulfurized alkyl-substituted hydroxyaromatic compound and its unsulfurized metal salt. The process involves the steps of: (a) providing a composition comprising (i) a salt of a sulfurized alkyl-substituted hydroxyaromatic compound; (ii) an unsulfurized 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 effective amount of 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.