Hydrochloric acid: Emissions

Carbon depends on whose chlorine it really is

What this tab covers The greenhouse-gas footprint per tonne, split by lifecycle phase (feedstock, production, movement, use, end of life), the global total, other environmental impacts, levers and low-carbon routes, India's position, and where the investment opportunity lies. Emission intensity 0.90 t CO2e per t range close to zero for by-product acid (allocation) to about 1.5 for synthesis on coal power · 0.97 t chlorine per t HCl x chlorine footprint about 0.7-1.6 t per t, plus minor absorption energy

Per t of HCl (100% basis), cradle-to-gate, direct synthesis. Intensity: derived from Euro Chlor 2022 eco-profile (indicative). Global total: not published.

Share of footprint by lifecycle phase

Feedstock 92% Production / process 2% Movement 6%

Footprint by lifecycle phase

Phase	Intensity	Share	Main sources of emissions	Notes	Source
Feedstock	about 0.85 t CO2e per t	92%	embodied footprint of chlorine and hydrogen	for by-product acid most burden is allocated to the main product	derived (indicative)
Production / process	about 0.02 t CO2e per t	2%	cooling and pumping; the reaction releases heat	minor	indicative
Movement	about 0.05 t CO2e per t	6%	road tankers carrying two-thirds water	shipping dilute acid is inefficient	indicative
Use	small	–	reaction with carbonates in wells and steel scale releases some CO2	acidising carbonate rock releases about 0.6 t CO2 per t HCl reacted (stoichiometric, indicative)	stoichiometry
End of life	not applicable	–	neutralised to chloride salts	spent pickle liquor is regenerated or neutralised	indicative

Other environmental impacts

Acid mist and spills; chloride loading in effluents; drug precursor diversion risk.

Levers to cut emissions

Low-carbon chlorine (renewable-powered electrolysis)
Regenerate spent pickle liquor instead of neutralising
Recycle by-product HCl to chlorine on site

India

Not published; India's HCl footprint follows its coal-heavy chlor-alkali power.

Emission figures are indicative global averages from the life-cycle studies named; actual footprints vary widely by site, energy mix and method.

Low-carbon routes

Route	Intensity	Cost premium	Status	Source
By-product HCl recycling and regeneration	low (allocation)	not published	standard at large steel and isocyanate sites	indicative

For a climate investor HCl itself is not an investment theme; it is a balancing product. The opportunity is in acid regeneration for steel pickling and in mineral-processing routes (synthetic rutile, rare earths, lithium) that can use cheap HCl from India's chlor-alkali clusters.