E-Factor Rechner — Formel
## E-Factor (Environmental Factor)
The E-factor is a green chemistry metric that quantifies the waste intensity of a chemical process.
### Formula
**E-factor = total waste (kg) / desired product (kg)**
Typical values: bulk chemicals 1-5, fine chemicals 5-50, pharmaceuticals 25-100+. Lower is better. The related Process Mass Intensity (PMI) = (waste + product) / product = E-factor + 1.
The E-factor is a green chemistry metric that quantifies the waste intensity of a chemical process.
### Formula
**E-factor = total waste (kg) / desired product (kg)**
Typical values: bulk chemicals 1-5, fine chemicals 5-50, pharmaceuticals 25-100+. Lower is better. The related Process Mass Intensity (PMI) = (waste + product) / product = E-factor + 1.
Lösungsbeispiel
A pharmaceutical synthesis produces 1 kg of product and 25 kg of waste.
- E-factor = 25 / 1 = 25
- PMI = (25 + 1) / 1 = 26
- For every kg of product, 25 kg of waste is generated.