Search results for: “ammonia”

Crop production: what CO2 intensity?

The CO2 intensity of producing corn averages 0.23 tons/ton, or 75kg/boe. 50% is from N2O emissions, a powerful greenhouse gas, from the breakdown of nitrogen fertilizer. Producing 1 kWh of food energy requires 9 kWh of fossil energy.
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Cyanide production: the economics?

Hydrogen cyanide is a chemical intermediate, used for making perspex, nylon-6,6 and sodium cyanide, which in turn is a crucial chemical for extracting gold and silver from precious metal ores. Marginal costs are usually $1,500-1,650/ton and CO2 intensities are 2-3 tons/ton.
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Crop production: how much does nitrogen fertilizer increase yields?

How much does fertilizer increase crop yields? Aggregating all of the global data, a good rule of thumb is that up to 200kg of nitrogen can be applied per acre, increasing corn crop yields from 60 bushels per acre (with no fertilizer) to 160 bushels per acre (at 200 kg/acre). But the relationship is logarithmic,…
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Costs of hydrogen from coal gasification?

What are the costs of hydrogen from coal gasification? This model looks line-by-line, across different plant configurations, aggregating data from technical papers. Black hydrogen costs $1-2/kg. But CO2 intensity is very high, as much as 25 tons/ton. It can possibly be decarbonized resulting in semi-clean hydrogen costing c$2.5/kg.
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