B	exergy rate of stream, kW
$N$	molar flow rate, mol/s
$ex$	specific molar exergy, kJ/mol
$C_{MeOH}$	conversion ratio of methanol
$S_{DMC}$	selectivity of DMC
$ST{Y}_{DMC}$	space-time yield of DMC, $mg·g_{cat}^{-1}·h^{-1}$
$H$	enthalpy, kJ/mol
$S$	entropy, kJ/(mol·K)
$y_i$	mole fraction of component $i$
$\dot{Ex}$	standard chemical exergy, mol/s
$T$	temperature, K
$R$	universal gas constant, kJ/(mol·K)
$∆G_f$	Gibbs free energy variation in the direction of a given chemical Reaction, kJ/mol
$n$	number of moles of element
$\dot{m}$	mass flow rate, kg/s
$h$	specific enthalpy, kJ/kg
${\mathsf{\phi }}_1$	exergy efficiencies
$\dot{Q}$	heat transfer rate, kW
$\dot{W}$	work rate, kW
$∆{\mathrm{H}}_{\mathrm{R}}$	Reaction Heat, kJ/mol
0	ambient reference
ch	chemical
ph	physical
ki	kinetic
po	potential
in	feed stream
out	outbound stream
d	destruction
el	element
r	high-grade heat sources
c	low-grade heat sources
p	products
u	utilities