Method for reducing the amount of colorants in a caustic liquor
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United States of America Patent
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-
Nov 26, 1991
Issued Date -
N/A
app pub date -
Apr 10, 1990
filing date -
Jul 31, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for treating caustic solutions to remove colorants, including iron, therefrom comprises: contacting the solution with a substance comprising a calcined product of a compound having the formula: A.sub.w B.sub.x (OH).sub.y C.sub.z.nH.sub.2 O, wherein A represents a divalent metal cation; B a trivalent metal cation; C a mono- to tetravalent anion; and w, x, y, z and n satisfying the following: 0
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