| 摘要 |
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 H2O/CaO molar ratio of 0.4 and a 3 hour hydration time. A 400 TBN product is formed with an H2O/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.
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