Process for making overbased calcium sulfonate detergents using calcium oxide and a less than stoichiometric amount of water

US6015778A · kind A · utility

Assignee

• The Lubrizol Corporation · US

Inventors

• Allen J. Rolfes · Mentor, US
• Scot Jaynes · Lockport, US

Key dates

• Filing date: Mar 27, 1998
• Grant date: Jan 18, 2000
• Expiry date: Mar 27, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07G99/0024
• WIPO field: Biotechnology
• WIPO sector: Chemistry

Abstract

A process for producing an overbased oil soluble calcium sulfonate, comprising the steps of: (a) mixing a substrate comprising a sulfonic acid or a calcium salt of a sulfonic acid, with at least one alcohol, a diluent oil, a carboxylic acid, an acidic material, water and calcium oxide to form a mixture; (b) heating the mixture to its reflux point to form a neutral calcium salt of the acid moieties; (c) removing a substantial portion of distillable solvents to form an intermediate residue; (d) adding to the intermediate residue at least one alcohol, a surfactant, calcium oxide and water such that for every 100 parts of substrate, there are not more than 25 parts water to form an intimate mixture having a direct base number of 90-250; (e) heating said intimate mixture (d) to below its reflux point to form a heated intimate mixture; (f) passing gaseous carbon dioxide into the heated intimate mixture (e) to form an overbased calcium sulfonate and a mixture of calcium hydroxide, calcium carbonate and regenerated water until the direct base number is from 90-150; (g) adding additional calcium oxide until the direct base number is from 90-250 followed by the passing of additional gaseous …