Method for the production of precipitated calcium carbonate...

Details Method for the production of precipitated calcium carbonate... Method for the production of precipitated calcium carbonate...

2008-05-13

2008-05-13

Langel, Wayne A. (Department: 1793)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

C423S432000, C423S636000, C423S637000, C423S640000

Reexamination Certificate

active

07371356

ABSTRACT:
Calcium carbonate with high brightness is prepared by treating calcium carbonate and/or the milk of lime used for its preparation by reacting milk of lime with carbon dioxide and/or at least one of the calcium-containing preliminary products used for the preparation of the milk of lime before, during and/or after this reaction with a bleaching agent which comprises at least one compound of the formula (I):in-line-formulae description="In-line Formulae" end="lead"?A[(CR1R2)SOpM(1/q)]r  (I)in-line-formulae description="In-line Formulae" end="tail"?where the variables have the following meanings:Ais NR3R4, NR3, N or OH;R1, R2, R3, R4independently of one another, are hydrogen oran organic radical;Mis ammonium or metalpis 2 or 3;qis the valency of M; andris 1 when A = OH or NR3R4, is 2 when A = NR3and is 3 when A = N;and where variables, if a mixture of compounds is used and/or r=2 or 3, are chosen independently of one another for each individual compound and/or for each [(CR1R2)SOpM(1/q)] group.

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J.A.H. Oates, Lime and Limestone: Chemistry and Technology, Production and Uses; 1998, pp. 109; 352-354.
Ullmann's Encyclopedia of Industrial Chemistry, 5thEd., vol. A25, “Sulfonic Acid and Derivatives”, pp. 461-476.
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