Table 2 Change in Gibbs energy and enthalpy for different steps on route B towards OME-4, published by Burger [9, 76]. Columns 5 and 6 show gases that were approximated as ideal even at high pressure; liquids were assumed as ideal mixtures (IG: ideal Gas, IM, ideal mixture). Columns 7 and 8 indicate gases that were approximated as real gases (RG) with an equation of state, i.e., polar Soave Redling Kwong, even at high pressure and liquids assumed as real mixtures with UNIFAC as GE model for excess Gibbs energy of mixture
From: Thermodynamic and ecological preselection of synthetic fuel intermediates from biogas at farm sites
Product | Eq. | p, bar | T, K | ΔHR (IG, IM), kJ/mol | ΔGR (IG, IM), kJ/mol | ΔHR (RG,GE), kJ/mol | ΔGR (RG, GE), kJ/mol |
|---|---|---|---|---|---|---|---|
Methanol | (8) | 80 | 523 | − 58.7 | 8.3 | − 72.0 | 5.1 |
Formaldehyde | (9) | 1 | 903 | − 148.2 | − 210.3 | − 155.4 | − 217.8 |
Methylal (l) | (10) | 2 | 333 | − 60.0 | − 30.4 | − 56.5 | − 30.0 |
Trioxan (l) | (11) | 1 | 343 | − 130.4 | − 40.9 | − 126.4 | − 38.9 |
OME-4 (l) | (12) | 1 | 343 | − 30.7 | 33.2 | − 29.5 | − 33.6 |