Ways to make Ammonium nitrate

2 routes in the Atlas, side by side per the same functional unit. Whether they compare is computed from their data, criterion by criterion; a warning sits next to each route it concerns.

Not comparable as they standAllocation: differs; System boundary: differs; Data quality (TfS DQR): not stated by every route; Reference product (grade, state): differs. The rows say which route each warning concerns.

Per 1 kg of Ammonium nitrate: 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
Ammonium nitrate and calcium ammonium nitrate by neutralisation of nitric acid with ammoniacontinuous neutralisation of 60 wt% nitric acid with gaseous ammonia at elevated pressure, evaporation to a melt, prilling or granulationammonium-nitrate/solid	Tier 1 (sourced conceptual)Design maturity: Concept (research)Not independently reviewedDataset review: unreviewed	RER, 2001	Electricity: 0.0425 kWh	Ammonia, anhydrous (vaporised on site): 0.213 kg Nitric acid, 60 wt% (weak acid): 1.31 kg Steam imported, by mass: 0.025 kg	Water of the acid, as vapour to air (vented process steam, prilling and cooling air): 0.441 kg Ammonia to air (after the scrubbers): 0.0000153 kg Dust to air (after the scrubbers, filters and cyclones): 0.0000379 kg	no footprint	Reference product (grade, state): product is ammonium-nitrate/solid; the routes state ammonium-nitrate/solid, ammonium-nitrate/solution System boundary: boundary is gate-to-gate: ammonia vaporisation, neutralisation, evaporation, prilling or granulation, cooling, screening, exhaust gas and condensate treatment; steam and power from outside; storage excluded; the routes state gate-to-gate: ammonia vaporisation, neutralisation, evaporation, prilling or granulation, cooling, screening, exhaust gas and condensate treatment; steam and power from outside; storage excluded, gate-to-gate: rock digestion in nitric acid, sand removal, CNTH crystallisation and filtration, CNTH conversion with NH3 and CO2 to CaCO3 and AN solution, AN evaporation, neutralisation, potash addition, granulation, drying, cooling, coating; ammonia, nitric acid, CO2, steam and power from outside Allocation: allocation is none (single product); the routes state mass, none (single product) Data quality (TfS DQR): states no data quality rating (TfS DQR)
NPK 15-15-15 by the nitrophosphate (ODDA) route, with CNTH conversion to ammonium nitrate and limenitrophosphate (ODDA) process: digestion in about 60 % HNO3, cooling crystallisation of calcium nitrate tetrahydrate, ammoniation of the nitrophosphoric acid, spherodiser or drum granulation; the mixed-acid route and CN fertiliser instead of conversion are not modelledammonium-nitrate/solution	Tier 0 (stoichiometric)Design maturity: Concept (research)Not independently reviewedDataset review: unreviewed	RER, 2002	a co-product of a multi-output dataset (product:npk, product:calcium-carbonate besides it): its share needs the allocation of the LCI database build			no footprint	Reference product (grade, state): product is ammonium-nitrate/solution; the routes state ammonium-nitrate/solid, ammonium-nitrate/solution System boundary: boundary is gate-to-gate: rock digestion in nitric acid, sand removal, CNTH crystallisation and filtration, CNTH conversion with NH3 and CO2 to CaCO3 and AN solution, AN evaporation, neutralisation, potash addition, granulation, drying, cooling, coating; ammonia, nitric acid, CO2, steam and power from outside; the routes state gate-to-gate: ammonia vaporisation, neutralisation, evaporation, prilling or granulation, cooling, screening, exhaust gas and condensate treatment; steam and power from outside; storage excluded, gate-to-gate: rock digestion in nitric acid, sand removal, CNTH crystallisation and filtration, CNTH conversion with NH3 and CO2 to CaCO3 and AN solution, AN evaporation, neutralisation, potash addition, granulation, drying, cooling, coating; ammonia, nitric acid, CO2, steam and power from outside Allocation: allocation is mass; the routes state mass, none (single product) Data quality (TfS DQR): states no data quality rating (TfS DQR)

How comparability is checked

Allocation: differs (same allocation method: mass, none (single product))
Background data (impacts): not applicable (same background data and boundary behind the impact numbers (only routes with a footprint))
System boundary: differs (same system boundary of the inventory (the dataset's boundary): gate-to-gate: ammonia vaporisation, neutralisation, evaporation, prilling or granulation, cooling, screening, exhaust gas and condensate treatment; steam and power from outside; storage excluded, gate-to-gate: rock digestion in nitric acid, sand removal, CNTH crystallisation and filtration, CNTH conversion with NH3 and CO2 to CaCO3 and AN solution, AN evaporation, neutralisation, potash addition, granulation, drying, cooling, coating; ammonia, nitric acid, CO2, steam and power from outside)
Data quality (TfS DQR): not stated by every route (data quality: every route states a TfS DQR, none more than 1 above the best)
Functional unit: same (same functional unit (amount and unit of the reference product): 1 kg)
Reference product (grade, state): differs (same reference product: registry grade and state: ammonium-nitrate/solid, ammonium-nitrate/solution)
System model: same (same system model (docs/system-model.md): cutoff)

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.