Chemistry of inorganic compounds – Nitrogen or compound thereof – Oxygen containing
Patent
1978-11-15
1981-08-25
Vertiz, O. R.
Chemistry of inorganic compounds
Nitrogen or compound thereof
Oxygen containing
423235, C01B 2120
Patent
active
042859239
ABSTRACT:
Calcium nitrate with low nitrate content is prepared by reacting in a series of absorption reactors lime slurry and nitrogen oxide gases. The lime slurry flows serially through the series of absorption reactors with a major portion being recycled to the inlet of a Venturi absorber in each reactor. Nitrogen oxide gases flow cocurrently with the slurry from each reactor to the following Venturi inlet and are contacted by recycle slurry in each Venturi with a molar ratio of calcium hydroxide to nitrogen oxides of at least about 20. Slurry from the last reactor with a calcium nitrite content of below about 22 weight percent and a calcium hydroxide content of at least about 2 weight percent may be freed of unreacted calcium hydroxide, for example by treatment with NO.sub.x gases, and then concentrated to the desired product concentration. The exit gases may be scrubbed with incoming lime slurry after passing through a holdup vessel which increases the ratio of NO.sub.2 to NO.
REFERENCES:
patent: 1070070 (1913-08-01), Rothe
patent: 3928543 (1975-12-01), Gregory et al.
patent: 4009246 (1977-02-01), Wendel
patent: 4208391 (1980-06-01), Endo et al.
Bean Samuel L.
Hoffman Robert J.
Low William W.
Seeling Philip F.
Allied Chemical Corporation
Doernberg Alan M.
Hoffman Thomas D.
Langel Wayne A.
Vertiz O. R.
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