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Table 1 Change in Gibbs energy and enthalpy for different steps on route B towards OME-4 published by Burger [9, 76]. Gases were approximated as ideal gas; liquids assumed as ideal mixtures. Thermodynamic property data were taken from Perry and Green for the ideal gas state and liquid state [68]

From: Thermodynamic and ecological preselection of synthetic fuel intermediates from biogas at farm sites

Product

Eq.

p, bar

T, K

ΔHR (STP), kJ/mol

ΔGR (STP), kJ/mol

ΔHR(p,T), kJ/mol

ΔGR(p,T), kJ/mol

Methanol

(8)

80

523

− 49.2

3.5

− 58.7

8.3

Formaldehyde

(9)

1

903

− 156.7

− 176.1

− 148.2

− 210.3

Methylal (l)

(10)

2

333

− 72.2

− 20.2

− 60.0

− 30.4

Trioxan (l)

(11)

1

343

− 118.0

− 7.2

− 130.4

− 40.9

OME-4 (l)

(12)

1

343

− 9.0

38.1

− 30.7

33.2

  1. STP standard pressure and temperature, R real gas