Sheet 'h+ Estimation' Of Biomass Hydrolysis

1. Input data in yellow cells 2. Observe whether Q_trial ~ Q_actual 3. If Q_trial is not ~ Q_actual, set Q_trial = Q_actual manually 4. Do no. 3 untill Q_trial ~ Q_actual

1. Calculation of concentration of acid solution added to fresh wood Specify weight percent of acid for hydrolysis* 1.00 * weight of pure acid divided by water from wood (moisture) plus from acid solution

Specify weight of dry wood to be hydrolysed Specify moisture of wood to be hydrolysed Water from wood to be hydrolysed

100 kg 50 %w of fresh wood 100 kg

Specify weight of pure acid (H2SO4) to be added Water from acid solution to be added Then: Concentration of acid solution added to fresh wood

2 kg 100 kg 2 %w

2. Calculation of Corrected Hydrogen Ion Concentration (Neutralizing Capacity of Wood) Specify temperature of hydrolysis 140 oC 413.15 K EQW (neutralizing capacity of wood) 131 meq/kg OD wood EQR (neutralizing capacity of residue) 49 meq/kg OD wood A (an empirical constant) 0.4 LS (Liquid-to-solid ratio) EQ (equivalents of cations released to solution) Concentrations of sulfate plus bisulfate ions Concentration of cations in solution D (dielectric constant for water) K (bisulfate dissociation equilibrium constant) S (Debye-Hückel limiting slope at temperature) Q_trial (bisulfate dissociation quotient)

2 8.2 0.103072 0.041414 37.38198 0.000265 0.950495 0.000797

Q_actual (bisulfate dissociation quotient) Then [H+] (Corrected Hydrogen Ion Concentration)

0.000792

kg/kg meq/kg OD wood mol/ 1 kg of water eq/ 1 kg of water

Target Q_trial ~ Q_actual

Concentration of sulfate ions in solution [HSO4-] Concentrations of bisulfate ions in solution [SO42-] IS (ionic strength)

=

0.062946 0.101783 0.001289 0.105649

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