Method for reducing the amount of colorants in a caustic liquor

Details Method for reducing the amount of colorants in a caustic liquor Method for reducing the amount of colorants in a caustic liquor

1990-04-10

1991-11-26

Langel, Wayne A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423183, 423600, 423629, 423641, C01D 132, C01F 704

Patent

active

050680951

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<z.ltoreq.x.ltoreq.4.ltoreq.w.ltoreq.1/2y and 12.gtoreq.n.gtoreq.1/2(w-x). On a preferred basis, the contacted substance is a hydrotalcite derivative made by reacting activated magnesia with an aqueous solution of aluminate, carbonate, and hydroxyl anions before calcining at one or more temperatures between about 400.degree.-650.degree. C. There is further disclosed a method for producing an aluminum hydroxide having improved whiteness according to the invention.

REFERENCES:
patent: 4915930 (1990-04-01), Goheen et al.

Affiliated with

Also associated with

Rating

Method for reducing the amount of colorants in a caustic liquor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for reducing the amount of colorants in a caustic liquor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for reducing the amount of colorants in a caustic liquor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2385400