# Citric acid: Emissions

Coal steam versus cleaner heat: the hidden footprint

Source page: https://www.materialinsights.org/chemicals/citric_acid/emissions/

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.

Per t of citric acid, cradle-to-gate. Intensity: not published (indicative). Global total: not published.

#### Footprint by lifecycle phase

| Phase | Intensity | Share | Main sources of emissions | Notes | Source |
|---|---|---|---|---|---|
| **Feedstock** | maize about 0.3-0.5 t CO2e per t grain (indicative, maize tile range); sugar farming 59-89% of mill-gate cane sugar emissions (sugar tile) | – | fertiliser N2O, diesel, land use | about 2 t of maize per t acid multiplies the crop footprint | maize and sugar tiles; indicative |
| **Production / process** | not published | – | aeration power, sterilisation and evaporation steam; coal boilers in China | lime-sulphuric acid recovery adds reagent footprints | indicative |
| **Movement** | not published; small | – | container shipping from China |  | indicative |
| **Use** | not applicable | – | consumed in food or released to wastewater, where it biodegrades |  | not applicable |
| **End of life** | biogenic CO2 from biodegradation | – | readily biodegradable | biogenic carbon, not counted as fossil | indicative |

#### Other environmental impacts

About 1 t of gypsum per t acid from the classical process (indicative); high-strength fermentation wastewater; maize and sugar land use.

#### Levers to cut emissions

- Switch Chinese fermentation steam from coal to biomass or electric boilers (indicative)
- Solvent or chromatographic recovery to cut gypsum and reagent use (indicative)
- Low-carbon maize and sugar sourcing
- Use mycelium and wastewater for biogas (indicative)

#### India

India has almost no citric acid production, so its footprint sits in Chinese plants; a domestic plant on Indian maize or molasses with bagasse steam could be lower carbon (indicative).
 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 |
|---|---|---|---|---|
| **Fermentation with renewable steam and power** | not published | not published | European producers report renewable energy use (indicative) | indicative |

 For a climate investor Citric acid is a mature, low-margin product dominated by China, so there is little room for a premium green product. The opportunity for India is import substitution: Indian maize millers and sugar mills with surplus sugar and bagasse steam could add fermentation lines. What has to be true: Chinese export prices stay above an Indian cash cost, or trade defence makes room. Gujarat Ambuja Exports' move into sodium gluconate shows the capability exists.

## Other sections

- [Summary](https://www.materialinsights.org/chemicals/citric_acid/index.md)
- [Overview](https://www.materialinsights.org/chemicals/citric_acid/overview/index.md)
- [Correlation](https://www.materialinsights.org/chemicals/citric_acid/correlation/index.md)
- [Production route](https://www.materialinsights.org/chemicals/citric_acid/routes/index.md)
- [Production](https://www.materialinsights.org/chemicals/citric_acid/production/index.md)
- [Feedstocks](https://www.materialinsights.org/chemicals/citric_acid/feedstocks/index.md)
- [Cycles](https://www.materialinsights.org/chemicals/citric_acid/cycles/index.md)
- [Trading](https://www.materialinsights.org/chemicals/citric_acid/trading/index.md)
- [Movement](https://www.materialinsights.org/chemicals/citric_acid/movement/index.md)
- [Regulation](https://www.materialinsights.org/chemicals/citric_acid/regulation/index.md)
- [Characteristics](https://www.materialinsights.org/chemicals/citric_acid/characteristics/index.md)
- [Relationships](https://www.materialinsights.org/chemicals/citric_acid/links/index.md)