Regeneration of carbon employed in the wet process production of

Details Regeneration of carbon employed in the wet process production of Regeneration of carbon employed in the wet process production of

1981-07-21

1983-01-18

Thomas, Earl C.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423321R, 252412, C01B 1516, C01B 2526, C01B 2516

Patent

active

043691684

ABSTRACT:
In a process for regenerating the activated carbon and in the purification of brown phosphoric acid or alkali phosphates obtained via the so-called wet process employing mineral acid digestion of crushed phosphate rock, the activated carbon used to filter brown H.sub.3 PO.sub.4 is removed from service, washed with water, the initial washings being recovered to reclaim phosphoric acid, and then steeped in a basic aqueous solution, e.g., aqueous alkali hydroxide, alkali carbonate, ammonium hydroxide, loweralkyl amines or loweralkanol amines. After again water washing the activated carbon, to remove residual base, the activated carbon is either returned to service or steeped in an aqueous solution of mineral acid, e.g., sulfuric, hydrochloric, or nitric acid, again washed with water to remove residual acid and returned to service. Usually, the acid steep need not be employed with every base cycle to maintain good decolorization, although if desired the acid steep can be used with each caustic cycle.

REFERENCES:
patent: 1533031 (1925-04-01), Sauer
patent: 3186793 (1965-05-01), Gillis et al.
patent: 3720626 (1972-03-01), Benzama et al.
patent: 3944513 (1976-03-01), Greenwald et al.
Chemical Abstracts, vol. 87, No. 24, (12/12/77); Abstract No. 188820r, p. 267, col. 1.
Journal of Applied Chemistry of the USSR, vol. 51, No. 8, Part 1, (8/78).

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