High-pressure vapor-liquid phase equilibrium (P, x, y) were measured for the binary systems of nitrogen + dimethyl sulfoxide, nitrogen + N-methyl-2-pyrrolidone, and nitrogen + diethylene glycol monobutyl ether over a temperature rage between (323.15 and 393.15) K. In addition to the new data, the Soave-Redlich-Kwong, Peng-Robinson, and Patel-Teja equations of state accompanied by several types of mixing rule were also used to correlate these vapor-liquid phase behaviors. In general, the Patel-Teja equation incorporated with mixing rule-C (linear temperature-dependent combining rule for a(ij)) yielded the best representation.