High overbased metal sulfurized alkylphenates

Details High overbased metal sulfurized alkylphenates High overbased metal sulfurized alkylphenates

C - Chemistry, Metallurgy

07

C

C07C 323/31 (2006.01) C07C 319/20 (2006.01) C10M 159/22 (2006.01)

Patent

CA 2213373

Process for preparing high overbased metal sulfurized alkylphenates, wherein a majority of the alkalinity is provided by at least a stoichiometric excess of metal. The process is characterized by a sulfurization reaction using a promoter, followed by overbasing with carbon dioxide, a polyamine, and additional metal base in the presence of an alkylene glycol under reactive conditions at temperatures in the range of about from 150° C to 190° C. The process affords a metal sulfurized phenate product which is substantially insensitive to overcarbonation, which exhibits low corrosive wear, and which exhibits high rates of acid neutralization. These compositions are useful in theformulation of marine cylinder lubricants.

Méthode pour préparer des alkylphénates sulfurés métalliques, fortement surbasiques, où la majeure partie de l'alcalinité provient d'au moins un excès stoechiométrique de métal. Le procédé est caractérisé par une réaction de sulfuration utilisant un promoteur, suivie d'une surbasification à l'aide de dixoyde de carbone, une polyamine et un métal de base supplémentaire en présence d'un alkylèneglycol, entre 150 et 190 degrés C environ. Le procédé permet d'obtenir un phénate sulfuré de métal, pratiquement insensible à la surcarbonatation, présentant une faible usure par corrosion et un taux élevé de neutralisation d'acide. Ces compositions sont utiles dans une formulation de lubrifiants pour corps de marine.

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