| 摘要 |
<p>IMPROVED PHENATE PRODUCT AND PROCESS There is provided a process for the preparation of an overbased sulfurized alkaline earth metal alkylphenate product which provides improved bright stock solubility and reduced foam stability, the overbased alkylphenate products produced thereby, and lubricating oil compositions containing such overbased alkylphenate products. According to the process, a mixture of an alkylphenol having an alkyl group containing from about 8 to about 40 carbon atoms, elemental sulfur, a dihydric alcohol containing from 2 to 6 carbon atoms, an alkaline earth metal compound, a lubricating oil, and a high boiling point linear monohydric alcohol having from about 18 to about 60 carbon atoms is heated to a first temperature within the range of about 121.degree.C (250.degree.F) to about 204.degree.C (400.degree.F); the resulting intermediate product mixture is contacted with carbon dioxide at a second temperature below 193.degree.C (380.degree.F) to provide a carbonated product mixture; the carbonated product mixture is treated to remove unreacted alkylphenol, unreacted dihydric alcohol, and substantially all of the remaining water of reaction to provide a final product mixture; and the final product mixture comprising said overbased alkylphenate and substantially all of the high boiling point linear monohydric alcohol is recovered.</p> |
