Process for treating an aqueous medium containing phosphate...

Details Process for treating an aqueous medium containing phosphate... Process for treating an aqueous medium containing phosphate...

2007-01-09

2007-01-09

Page, Thurman K. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C423S390100

Reexamination Certificate

active

10497230

ABSTRACT:
The invention relates to a process for preparing nitric acid by treating an aqueous medium containing organic compounds and phosphate, said process comprising:feeding the aqueous medium to a nitric acid synthesis zone;forming nitric acid by contacting the aqueous medium with a gaseous medium in said nitric acid synthesis zone, said gaseous medium containing NO2;discharging an off-gas from said nitric acid synthesis zone;wherein the total organic carbon concentration in the aqueous medium entering the nitric acid synthesis zone is less than 0.03 wt. %.

REFERENCES:
patent: 3940442 (1976-02-01), de Rooij
patent: 3948988 (1976-04-01), De Rooij
patent: 3997607 (1976-12-01), de Rooij
patent: 1138750 (1969-01-01), None
patent: 1284515 (1971-04-01), None

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