In case of adding new equipment in parallel to the synthesized batch processes, there are two operating modes for the added equipment. One is "out-of-phase (in-sequence)" mode and the other is "in-phase" mode. However, previous approaches in solving the synthesis problem as a MINLP (Mixed Integer NonLinear Programming) problem so far have considered only the out-of-phase mode. In this paper, using MINLP, heuristics and NLP (nonlinear programming) formulation, we deal with the problems where the in-phase mode is also considered. The effectiveness of this approach is verified by solving three literature problems.