Green Chemistry Reactor: Atom Economy & E-Factor

Reaction Controls

Catalyst loading 4.0 mol%

Temperature 80 °C

Alcohol excess 1.5 equiv

Solvent

Live Metrics

Conversion

Selectivity

Yield

Atom economy

83.0%

E-factor

0.0

PMI

0.0

Waste generated

0.0 kg / kg product

Green Score

How it works

The reactor runs a catalyzed Fischer esterification: acetic acid + ethanol → ethyl acetate + water, fed with excess alcohol and an acid catalyst. Three classic green-chemistry metrics update live from the reaction conditions:

Atom Economy = MW(product) / Σ MW(reactants) × 100
             = 88.1 / (60.1 + 46.1) × 100 ≈ 83.0%  (fixed by stoichiometry)

E-factor = mass(all waste) / mass(product)
         = [unreacted acid + unreacted alcohol + water + solvent] / product mass

PMI (Process Mass Intensity) = E-factor + 1

Conversion rises with catalyst loading and temperature through an Arrhenius-like rate term; selectivity falls at high temperature as a competing decomposition pathway speeds up faster than the main reaction. Yield = conversion × selectivity, and it is yield — not atom economy — that ultimately sets how much product actually reaches the outlet per batch of reagents fed in.

Catalyst loading — more catalyst speeds conversion but has no effect on atom economy (a true catalyst is not consumed).
Temperature — trades conversion for selectivity; the real optimum balances both against yield.
Alcohol excess — pushes conversion up but every unreacted excess mole becomes waste, hurting the E-factor even while yield improves.
Solvent — water and ethanol are low-hazard, low-mass-tax choices; dichloromethane (DCM) and toluene add hazard and raise PMI even at identical yield — the essence of solvent selection in real green-chemistry process design.

Acetic acid Ethanol Ethyl acetate (product) Water + waste

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