# Lactic acid and PLA: Production route

Why fermentation beat chemistry, and the gypsum problem

Source page: https://www.materialinsights.org/chemicals/lactic_acid_pla/routes/

What this tab covers How it is made: the main production routes or, for product families, the main product types and technologies, compared on share of supply, inputs per tonne, plant scale, yield, co-products and unit cost.

Lactic acid is made almost entirely by fermentation, because it gives the pure L-form needed for PLA; chemical synthesis from acetaldehyde and HCN gives a racemic mix and has largely disappeared (indicative). PLA is made in two main ways: through lactide and ring-opening polymerisation, which all large plants use, or by direct polycondensation, which gives low molecular weight. The key cost levers are sugar yield, the recovery step (which can create a tonne of gypsum per tonne) and scale of the lactide unit.

#### Routes compared

| Route | Share of supply | Inputs per tonne | Typical scale | Yield | Co-products | Unit cost |
|---|---|---|---|---|---|---|
| **Lactic acid fermentation with lime neutralisation** | most lactic acid capacity (indicative) | about 1.1-1.3 t sugar per t lactic acid; similar tonnages of lime and sulphuric acid (indicative) | 50-200 kt/yr (indicative) | about 0.9 t per t glucose (indicative) | gypsum about 1 t per t (indicative) | sugar dominates cash cost (indicative) |
| **Low-pH or gypsum-free fermentation** | growing (indicative) | less lime and acid | commercial and demonstration | similar | little gypsum | higher capex, lower reagent cost (indicative) |
| **PLA via lactide and ring-opening polymerisation** | nearly all PLA (indicative) | about 1.4 t lactic acid per t PLA; 1.5-1.7 t sugar per t PLA (Balrampur figures, 2026) | 75-150 kt/yr lines: NatureWorks Blair 150 kt, Thailand 75 kt; TotalEnergies Corbion Rayong 75 kt | about 90-95% from lactic acid (indicative) | water | PLA sells at roughly $2,000-3,000/t (indicative); Balrampur says it is initially dearer than conventional plastics (S&P Global, 2026) |
| **Chinese integrated PLA from maize** | a rising share of world PLA capacity (indicative) | about 2.5 t maize per t PLA (indicative) | 30-150 kt/yr (indicative) | not published | maize co-products | not published |

#### How each route works
**Lactic acid fermentation with lime neutralisation**

Lactobacillus or Bacillus strains ferment glucose at near neutral pH; lime keeps pH up and forms calcium lactate, which sulphuric acid splits, leaving gypsum.

Mature; gypsum waste.
 indicative **Low-pH or gypsum-free fermentation**

Acid-tolerant yeasts or bacteria, or salt-splitting by electrodialysis or ammonium routes, avoid most gypsum. Corbion and NatureWorks have developed such routes (indicative).

Cleaner; less proven.
 indicative **PLA via lactide and ring-opening polymerisation**

Lactic acid is condensed to oligomers, cracked to lactide, purified by distillation or crystallisation, then polymerised with a tin catalyst. Ratios of L- and D-lactide set crystallinity and heat resistance.

High molecular weight and full grade range; capital intensive.
 MarketsandMarkets 2026; S&P Global 2026; indicative **Chinese integrated PLA from maize**

Chinese groups such as COFCO, BBCA/Fengyuan and Hisun integrate maize milling, lactic acid and PLA (indicative). New Chinese capacity pushed Asian prices down in early 2025 (Procurement Resource).

Low cost; quality and utilisation uneven.
 Procurement Resource H1 2025; MarketsandMarkets; indicative Unit economics are indicative ranges from the sources named; costs move with feedstock and energy prices, plant size and region.

## Other sections

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