Process for the purification of industrial gases or waste gases

Details Process for the purification of industrial gases or waste gases Process for the purification of industrial gases or waste gases

1986-07-23

1988-03-15

Doll, John

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

204 1T, 204293, 423224, 423573R, 436150, B01D 5334

Patent

active

047312327

ABSTRACT:
In purifying gas wash waters containing cyanide with formaldehyde, the exact dosing of formaldehyde presents a problem, especially with strongly fluctuating cyanide contents. By continuous potentiometric measurement in a side stream which is regulated to a pH of 7 to 10, while the pH of the main stream remains unchanged, the formaldehyde can be adjusted safely to any cyanide content.

REFERENCES:
patent: 2859090 (1958-11-01), Karchmer et al.
patent: 2912367 (1959-11-01), Asendorf et al.
patent: 3923608 (1975-12-01), Frant et al.
patent: 4211646 (1980-07-01), Westbrook et al.
"Electrode Indicator Technique for Measuring Low Levels of Cyanide", Frant et al., Analytical Chemistry, vol. 44, No. 13 (11-1972), pp. 2227-2230.
"Amperometric Titrations", Stock, Analytical Chemistry, vol. 46, No. 5 (4-1974), pp. 1R-7R.

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