  Within a mean field approximation, we study a nontopological soliton solution
of the Polyakov quark-meson model in the presence of a fermionic vacuum term
with two flavors at finite temperature and density. The profile of the
effective potential exhibits a stable soliton solution below a critical
temperature $T\leq T_{\chi}^c$ for both the crossover and the first-order phase
transitions, and these solutions are calculated here with appropriate boundary
conditions. However, it is found that only if $T\leq T^c_d$,the energy of the
soliton $M_N$ is less than the energy of the three free constituent quarks
$3M_q$. As $T> T^c_d$, there is an instant delocalization phase transition from
hadron matter to quark matter. The phase diagram together with the location of
a critical end point (CEP) has been obtained in $T$ and $\mu$ plane. We notice
that two critical temperatures always satisfy $T^c_d\leq T_{\chi}^c$. Finally,
we present and compare the result of thermodynamic pressure at zero chemical
potential with lattice data.
