Inexpensive purification of urea waste streams

Details Inexpensive purification of urea waste streams Inexpensive purification of urea waste streams

1977-10-31

1980-02-12

Spitzer, Robert H.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 38A, 210 38B, 210 63R, C02B 116, C02B 144

Patent

active

041882920

ABSTRACT:
Urea is destroyed in aqueous waste streams containing various anions and cations plus urea by contacting the stream with a cation exchange resin, then reacting the resulting stream with nitric oxide, nitrous acid or a nitrite salt to convert the urea to nitrogen, carbon dioxide and water and treating the resulting stream with an anion exchange resin. A pure aqueous stream is obtained which does not adversely affect the environment and which may be recycled to a plant as fresh water resulting in large monetary savings in fresh water cost.

REFERENCES:
patent: 2744840 (1956-05-01), Daniels
patent: 3313726 (1967-04-01), Campbell
patent: 3316171 (1967-04-01), Mastrorilli
patent: 3655395 (1972-04-01), Karnemat
patent: 3755088 (1973-11-01), Higgins
Hackh's Chemical Dictionary, McGraw-Hill Book Co., New York, Fourth Edition, 1972, pp. 461-462, 457 and 459.
Organic Chemistry, Astle and Shelton, 2nd Edition, New York, 1959, p. 208.
Amber-Hi-Lites, Rohm and Haas, Oct. 1971.

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