Process for making basic alkali metal sulfate pigments

Details Process for making basic alkali metal sulfate pigments Process for making basic alkali metal sulfate pigments

1997-12-24

1999-04-20

Straub, Gary P.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

23302R, 23305A, 106401, 423184, 423199, C09C 140, C09D 1700

Patent

active

058955232

ABSTRACT:
A process is provided for making K.sub.2 SO.sub.4 3Al.sub.2 O.sub.3 4S0.sub.3 +xH.sub.2 O or Na.sub.2 SO.sub.4 3Al.sub.2 O.sub.3 4SO.sub.3 +xH.sub.2 O where x is a number from 4 to 12, which is used as a pigment. Sulfuric acid, one of a sulfate salt or a hydroxide of either potassium or sodium and one of a sulfate of aluminum or a hydroxide of aluminum are inputted into a crystallizer and reacted to form either Al.sub.2 (SO.sub.4).sub.3 K.sub.2 SO.sub.4 +24H.sub.2 O or Al.sub.2 (SO.sub.4).sub.3 Na.sub.2 SO.sub.4 +24H.sub.2 O. A fluid flow containing either Al.sub.2 (SO.sub.4).sub.3 K.sub.2 SO.sub.4 +24H.sub.2 O or Al.sub.2 (SO.sub.4).sub.3 Na.sub.2 SO.sub.4 +24H.sub.2 O is drawn off from the crystallizer and transferred into a pigment reactor where it is subjected to a temperature of about 200.degree. C. and a pressure ranging from 120 to 350 pounds per square inch so as to result in the production of either basic potassium aluminum sulfate K.sub.2 SO.sub.4 3Al.sub.2 O.sub.3 4SO.sub.3 +xH.sub.2 O or basic sodium aluminum sulfate Na.sub.2 SO.sub.4 3Al.sub.2 O.sub.3 4SO.sub.3 +xH.sub.2 O where x is a number from 4 to 12 which is further treated in a filtration step to obtain pigment solids and a mother liquor. A portion of the reaction mixture is bled off from the crystallizer in an amount that is inversely proportional to the purity of the materials inputted into the crystallizer and the mother liquor is recycled back to the crystallizer, so that this process is able to process and react starting materials that may be of relatively lower purity.

REFERENCES:
patent: 2895813 (1959-07-01), Brooksbank et al.
patent: 4769080 (1988-09-01), Clark et al.

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