Method of preparing overbased calcium sulfonates

Details Method of preparing overbased calcium sulfonates Method of preparing overbased calcium sulfonates

1987-12-07

1988-10-25

Howard, Jacqueline V.

Compositions

Electrolytes for electrical devices

252 33, 252 334, 252 18, C10M13510

Patent

active

047802243

ABSTRACT:
In an overbased sulfonate process calcium hydroxide is formed in situ by first adding 25% of the total water and then adding the remainder of the water uniformly to the calcium oxide over the entire hydration and carbonation time rather than incrementally. It has been found experimentally that by first adding at least 25% of the total water in a single aliquot that crystalline calcium carbon formation is suppressed.
A 300 TBN product is formed with an H.sub.2 O/CaO molar ratio of 0.4 and a 3 hour hydration time. A 400 TBN product is formed with an H.sub.2 O/CaO molar ratio of 0.8 and 3 hour hydration time.
Improved storage stability is achieved by eliminating crystalline calcium carbonate formation. Crystalline calcium carbonate has been related to engine wear.

REFERENCES:
patent: 4427559 (1984-01-01), Whittle
patent: 4597880 (1986-07-01), Eliades
patent: 4604219 (1986-08-01), Whittle
patent: 4698170 (1987-10-01), Le Coent

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