Distillation boundaries are created by saddle azeotropes. They divide composition space for distillation regions. There are simple distillation boundaries (SDB), total reflux distillation boundaries (TRB) and pitchfork distillation boundaries (PDB). This is not clear if node azeotropes are able also to create PDB and if PDB influence upon distillation region in that case. This paper is addresses this question.