Nitrogen blanketing implies a constant pressure system in which only enough nitrogen is added to maintain the vessel pressure. If the partial pressure of all volatile materials in the reactor sums to less than the control pressure, then the remaining partial pressure is N2. This composition should be used at the entrance to the reflux condenser. All “non-condensables” will be those vapors/gasses which will not condense at the discharge temperature of the reflux condenser. A flash calculation must be done to determine vapor and liquid phases at the entrance and exit of the unit. For reflux condensors, it is best to utilize a differential flash rather than an integral flash. If possible, simulate the entire reactor utilizing either equilibrium or kinetic reaction constants and henry’s law data for nitrogen solubility.