I have two terms related to distillation and would like an explanation from you

Try checking whether the reactant is in an intermediate boiling state or at an saddle point on the residue curve diagram of the mixture. The reactant is either in an intermediate boiling state or at the saddle point (concave area) on the residue curve graph of the mixture. As for intermediate boiling, Wikipedia explains it as follows: There are two main types of boiling; nucleate boiling, in which small bubbles of vapor form at discrete points, and critical heat flux boiling, in which the boiling surface is heated above a certain critical temperature and a film of vapor forms on the surface. Transition boiling is an intermediate, unstable form of boiling that combines elements of both types. There are two modes of boiling: 1) nucleate boiling, where small bubbles form at specific locations; 2) critical heat flux boiling, where the boiling surface is heated to a certain critical temperature, resulting in the formation of a vapor film on that surface. The unstable transitional state between these two modes is what’s known as intermediate boiling. I’m not sure if this is correct; let’s wait for experts to give their opinions