Patent ID: 9688939
Date: 2017-06-27
CPC Classifications: C10M,C10N

Claim:
1. A process for preparing a sulfurized calcium phenate detergent having a reduced content of unsulfurized alkyl-substituted phenol comprising the steps of: (A) providing, made from an unsulfurized alkyl-substituted phenol, a sulfurized calcium phenate detergent that, optionally, may have been further reacted with carbon dioxide; (B) adding to the detergent from 1 to 100 mass %, based on the mass of the detergent, of an organic solvent that has a boiling point of above 100° C. and below the boiling point of the unsulfurized alkyl-substituted phenol; and (C) distilling the solvent from the detergent thereby to reduce the content of the unsulfurized alkyl-substituted phenol.