Liquid purification or separation – Automatic control
Patent
1991-10-10
1993-05-18
Silverman, Stanley S.
Liquid purification or separation
Automatic control
210206, 210241, 2102571, 156642, C02F 162
Patent
active
052118436
ABSTRACT:
A chelation process and apparatus for treating an acid solution, namely nitric acid photoengraving etchant, having a high concentration of magnesium and having a heavy metal contaminant produced by zinc leached during etching. The process requires adjusting pH of a batch quantity of the etch solution to a value permitting chelating to occur and mixing carbamic sodium salt hydrate chelating agent with the solution in quantity sufficient to cause precipitation from the solution of a carbamic salt compound precipitate of the contaminant, and separating the precipitate from the remaining solution by filter press for removal from the solution for safe environmental disposal. The remaining liquor is safely sewered. The apparatus is mobile for use on photoengraving premises.
REFERENCES:
patent: 2938046 (1960-05-01), Morehouse
patent: 3102808 (1963-09-01), Weisberg et al.
patent: 3438901 (1969-04-01), Vassileff
patent: 3816306 (1974-06-01), Roy
patent: 3843504 (1974-10-01), Nayder
patent: 3849218 (1974-11-01), Beckwith et al.
patent: 3920552 (1975-11-01), Elkern
patent: 3953306 (1976-04-01), Lancy
patent: 3966601 (1976-06-01), Stevenson et al.
patent: 4033764 (1977-07-01), Colegate et al.
patent: 4180469 (1979-12-01), Anderson
patent: 4233111 (1980-11-01), Valayil et al.
patent: 4482377 (1984-11-01), Heins
patent: 4578195 (1986-03-01), Moore et al.
patent: 4664798 (1987-05-01), Bergh
patent: 4670160 (1987-06-01), Moriya et al.
patent: 4678584 (1987-07-01), Elfline
patent: 4731187 (1988-03-01), Moriya et al.
patent: 4749497 (1988-06-01), Kanzleiter et al.
patent: 4762691 (1988-08-01), Miyazaki et al.
patent: 4765834 (1988-08-01), Ananthapadmanabhan et al.
patent: 4802993 (1989-02-01), Katoh
patent: 4957634 (1990-09-01), Bowers, Jr.
patent: 5069779 (1991-12-01), Brown et al.
Environmental Analysis, Ed. Galen Ewing, Academic Press, Inc., New York, N.Y., 1977, 253-265.
Anal. Chem. 1982, 54, 2536-2539.
Plating and Surface Finishing, Jan., 1982, 66-71.
Moore Bill W.
Wester Gary R.
McCarthy Neil M.
Silverman Stanley S.
Spectrulite Consortium, Inc.
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