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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

QuantityC2H4 from CH3OHC3H6 from CH3OHC4H8 from CH3OHC2H4 from DMEC3H6 from DMEC4H8 from DME
p. bar3.53.53.53.53.53.5
T. K788788788788788788
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