| 摘要 |
A method for the preparation of overbased metal naphthenates of improved clarity and filterability by reacting a mixture of an oil soluble metal naphthenate, and a metal hydroxide in a light hydrocarbon-alcohol-nonpolar diluent oil solvent medium with carbon dioxide at a temperature of 140 to 155 DEG F using a mole ratio of metal hydroxide to metal naphthenate ranging from 1:1 to 10:1 and a CO2 to metal naphthenate mole ratio of 0.75 to 1.1, allowing the mixture to stand for 1 to 100 hours; then filtering the resulting carbonated mixture and recovering the desired composition wherein the degree of overbasing of the naphthenate ranges from 1 to 10.
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