Process for producing aqueous solution of calcium nitrite

Details Process for producing aqueous solution of calcium nitrite Process for producing aqueous solution of calcium nitrite

1980-04-09

1981-06-16

Vertiz, O. R.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Oxygen containing

423235, C01B 2120

Patent

active

042737540

ABSTRACT:
An aqueous solution of calcium nitrite having high purity and high concentration is obtained by contacting a nitrogen oxides containing gas with an aqueous slurry of calcium hydroxide.
It is necessary to use the aqueous slurry having high calcium hydroxide content such as 20 to 40 wt. %, whereby it is necessary to feed the gas having high nitrogen oxides concentration such as 5 to 12 vol. % to give high conversion to calcium nitrite. In order to prevent a formation of a by-product of calcium nitrate, a nitrogen oxides containing gas having 5 to 12 vol. % of a nitrogen oxides concentration and 1.5 to 2.5 of a molar ratio of NO/NO.sub.2 is fed under a high pressure enough to prevent a condensation of said slurry as a first stage and then, the unabsorbed gas is oxidized and the resulting gas having 1 to 5 vol. % of a nitrogen oxides concentration and 1.6 to 2.5 of molar ratio of NO/NO.sub.2 is fed to the aqueous slurry having 2 to 12 wt. % of a calcium hydroxide obtained in the first stage so as to convert the residual calcium hydroxide to calcium nitrite without forming a by-product of calcium nitrate. The process is carried out as continuous process having a first reaction zone and a second reaction zone.

REFERENCES:
patent: 4208391 (1980-06-01), Endo et al.

Affiliated with

Also associated with

Rating

Process for producing aqueous solution of calcium nitrite does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing aqueous solution of calcium nitrite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing aqueous solution of calcium nitrite will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-155173