C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 39/235 (2006.01) C10M 135/02 (2006.01) C10M 159/22 (2006.01)
Patent
CA 2109758
OVERBASED PHENATE PROCESS Abstract of the Disclosure Overbased sulfurized alkaline earth metal alkylphenate having excellent water tolerance properties in lubricant formulations is prepared by charging into a reactor a pre- heated (280-380°F) mixture of alkaline earth metal base and alkylphenol (preferably in oil), while simultaneously, but separately, charging a promoter solvent such as a glycol. Then a controlled amount of molten sulfur is charged at a rate that controls the reaction exotherm and off-gas evolu- tion, while maintaining the 280-380°F temperature. Upon completing the sulfur charge, the reactor contents are al- lowed to interact at 280-380°F long enough to form the sul- furized alkylphenate. While keeping the temperature at 280- 380°F, the sulfurized alkylphenate is overbased by charging the reactor simultaneously with controlled amounts of al- kaline earth metal base, promoter solvent, and carbon diox- ide gas, at a controlled charge rate not much greater or less than the rate at which the reactants undergo reaction to form the overbased phenate. Upon completing the charging of the alkaline earth metal base and promoter solvent, the carbon dioxide charge is continued until completion of the carbonation reaction. Unreacted alkylphenol and promoter solvent are stripped off under vacuum with inert gas purge at 400-480°F, and the resultant reaction product is filtered and the filtered product recovered. The reaction cycle time is no more than about 6 hours, and the filtered product has water tolerance properties normally associated with a batch preparation of the same product requiring a reaction cycle time of at least 8 hours.
Ethyl Petroleum Additives Inc.
Macrae & Co.
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