Process for producing calcium trisulfoaluminate and apparatus for use in said process
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United States of America Patent
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Dec 23, 2008
Grant Date -
Aug 23, 2007
app pub date -
Feb 2, 2007
filing date -
Aug 4, 2004
priority date (Note) -
Expired
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Abstract
This invention provides a production process, which can stably produce high-quality satin white (calcium trisulfoaluminate) having very small and homogeneous particulate shapes suitable for incorporation into coated paper for printing, and an apparatus for use in said process. In this process for producing calcium trisulfoaluminate, a calcium hydroxide suspension (A) is reacted with an aqueous aluminum sulfate solution (B) to produce calcium trisulfoaluminate (C). The aqueous aluminum sulfate solution (B) is added in plurality of stages to the calcium hydroxide suspension (A). At least any one stage of the plurality of stages addition, addition of the aqueous aluminum sulfate solution (B) to the calcium hydroxide suspension (A) is carried out in such a manner that the aqueous aluminum sulfate solution (B) is continuously added to the calcium hydroxide suspension (A) being continuously transferred.
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