substance

Sodium nitrite

Formula: NaNO2
CAS: 7632-00-0
InChIKey: LPXPTNMVRIOKMN-UHFFFAOYSA-M
ChEBI: CHEBI:78870

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Made by

Sodium nitrite from ammonia oxidation and soda absorption (with sodium nitrate by inversion)Main productConcept · not reviewed

Used by

No process in the Atlas uses this yet.

When a process with this chemical is added to the library, it appears here.

Takes part in

3NaNO₂+2HNO₃gives3NaNO₃+2NO+H₂OReactant · Inversion of sodium nitrite to sodium nitrate with nitric acid · one process
Na₂CO₃+2NO₂givesNaNO₂+NaNO₃+CO₂Product · Absorption of excess NO2 in soda solution to nitrite and nitrate (side reaction) · one process
Na₂CO₃+NO+NO₂gives2NaNO₂+CO₂Product · Absorption of equimolar NO + NO2 (N2O3) in soda solution to nitrite · one process

Routes compared

One route in the Atlas makes Sodium nitrite: nothing to compare yet. A comparison appears when a second route is added.

Per 1 kg of Sodium nitrite: inventory from each route's LCI dataset, unallocated; footprints per the functional unit of their own LCA.

Route	Tier, design maturity, review status	Geography, year	Energy	Feedstocks	Key emissions	Footprint	Comparability
Sodium nitrite from ammonia oxidation and soda absorption (with sodium nitrate by inversion)Ammonia oxidation over Pt/Rh gauze near atmospheric pressure with waste heat boiler, NOx absorption in 20 wt-% soda solution, double-effect evaporation, NaNO2 vacuum crystallisation, centrifuging and drying, inversion of the mother-liquor purge with 60 wt-% nitric acid to sodium nitrate; 20 kt/a NaNO2	flowsheet or hand-writtenDesign maturity: Concept (research)Not independently reviewedDataset review: unreviewed	GLO, 2026	Electric power (AC, grid): 0.0752 kWh Low-pressure steam 450 kPa(a) from the site header: 0.798 kWh	Liquid ammonia from ammonia-1 (battery limit, 1600 kPa(a)): 0.272 kg Ambient air: 4.01 kg (free) Soda ash, dense, from soda-ash-1: 0.866 kg Nitric acid 60 wt-% from nitric-acid-1: 0.0958 kg	CO2 to the environment: 0.359 kg N2O to the environment: 0.00492 kg NH3 to the environment: 0 kg NO to the environment: 0.00245 kg NO2 to the environment: 0 kg	not published	–

ISO 14044 requires a critical review (by a panel of interested parties, ISO/TS 14071) of a comparative assertion intended to be disclosed to the public. These routes are listed side by side for screening; a statement that one is better than another needs that review. None of these routes has had such a review.