METHOD FOR PREPARING A SULFURIZED ALKALINE EARTH METAL DODECYLPHENATE

摘要

An overbased sulfurized alkaline earth metal alkylphenate is prepared by reacting an alkylphenol with an alkaline earth metal hydroxide or an alkaline earth metal oxide and sulfur in the presence of an alkylene glycol or dialkylene glycol, or ether thereof and in the presence of an oil of lubricating viscosity, and optionally further reacting the product thereof with carbon dioxide; thereby forming a sulfurized alkaline earth metal alkylphenate composition in oil. The composition is heated and subjected to steam stripping followed by filtration. The resulting product exhibits an improved rate and efficiency of filtration.

主权项

1. A process for preparing a sulfurized alkaline earth metal alkylphenate, comprising:
(a) reacting
(i) an alkylphenol, wherein the alkyl group contains about 6 to about 24 carbon atoms, with:(ii) an alkaline earth metal hydroxide or an alkaline earth metal oxide in an amount of about 0.4 to about 10 moles per mole of alkylphenol charged to the reaction; and(iii) a sulfur source in an amount to provide about 0.8 to about 3 moles sulfur (as S) per mole of alkylphenol charged to the reaction; in the presence of(iv) an alkylene glycol or dialkylene glycol, or ether thereof, in an amount of about 0.2 to about 2 moles per mole of alkylphenol charged to the reaction; and including in the reaction mixture(v) an oil of lubricating viscosity; and optionally further reacting the product thereof with:
(vi) carbon dioxide; thereby forming a sulfurized alkaline earth metal alkylphenate composition in oil; (b) heating said alkylphenate composition to about 120 to 280° C.; (c) supplying steam to said alkylphenate composition; (d) removing said steam under reduced pressure; and (e) filtering the resulting composition to provide, as the filtrate, a sulfurized alkaline earth metal alkylphenate in oil.