Table 4 Change in Gibbs energy and enthalpy for different steps from methanol and DME to olefins. The gases in rows 4-7 were approximated as ideal; the liquids assumed as ideal mixtures. Thermodynamic property data were taken from [68] for ideal gas and liquid states. The real gases in rows 8 and 9 were calculated by Aspen Plus® with a modified EOS SRK for polar components [81]
From: Thermodynamic and ecological preselection of synthetic fuel intermediates from biogas at farm sites
Quantity | C2H4 from CH3OH | C3H6 from CH3OH | C4H8 from CH3OH | C2H4 from DME | C3H6 from DME | C4H8 from DME |
|---|---|---|---|---|---|---|
p. bar | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 |
T. K | 788 | 788 | 788 | 788 | 788 | 788 |
ΔHR.id (STP). kJ/mol | − 29.2 | − 102.9 | − 164.0 | − 5.2 | − 66.9 | − 116.0 |
ΔGR.id (STP). kJ/mol | − 64.1 | − 136.6 | − 194.8 | − 47.3 | − 111.5 | − 161.2 |
ΔHR.id(p.T). kJ/mol | − 23.4 | − 93.6 | − 159.4 | − 3.5 | − 63.8 | − 110.6 |
ΔGR.id(p.T). kJ/mol | − 130.3 | − 205.7 | − 263.5 | − 119.2 | − 190.5 | − 244.3 |
ΔHR.RG (p.T). kJ/mol | − 23.4 | − 93.1 | − 150.3 | − 3.5 | − 63.4 | − 110.6 |
ΔGR.RG (p.T). kJ/mol | − 117.7 | − 190.5 | − 246.7 | − 110.3 | − 179.3 | − 231.8 |