The name is absent

J2M^mi-l) (lnp_i - 1)-£x_i(m_i-l) (in g^fc_i^s(⅛)) ,
i                                                 i

(2.14)

or simply,

A^fcc ч .           . ч A^hs

---— = > Xi (InPj — 1) + > Х_гГП,———

NkT              > ^{г l}N_skT

i                                        i

In eqn. 2.15, the first term is the ideal free energy of the mixture of chain fluids.

Hence, the residual helmholtz free energy of a mixture of hard chain fluids from

SAFT-HS is given as

Λ he,res     __          A hs

=          ^- ∑^^m, -1) (⅛⅛)) ∙      (2∙16)

i                 ^s               i

Ghonasgi and Chapman [80] and independently Chang and Sandier [81] proposed
a modification of the expressions for the free energy contribution due to chain con-
nectivity [80]. Ghonasgi and Chapman labeled the resulting equation of state SAFT-
Dimer (or SAFT-D for short). The change to the chain term (A^cfcam) is schematically
illustrated in figure 2.3, and consists in the addition of an extra step in the deriva-
tion of the expression for the free energy contribution due to chain connectivity. In
SAFT-HS, all the bonds between segments are formed simultaneously, and are thus
equivalent. In SAFT-D, dimers are formed in a first step from the mixture of hard

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