Ternary copolymerization of N-antipyryl acrylamide (NAA) with different alkyl acrylates [methyl acrylate (MA), ethyl acrylate (EA), butyl acrylate (BuA)] or styrene (ST) and acrylonitrile (AN) were carried out in solution at 65-degrees-C in the presence of AIBN as a free radical initiator. Experimental terpolymerization data agree well with calculations based on the Alfrey-Goldfinger equation. The determination of unitary, binary, and ternary azeotropes of various systems studied was easily handled by a computer program. Ternary azeotropic compositions for NAA-MA-AN, NAA-EA-AN, NAA-BuA-AN, and NAA-ST-AN systems were 31.0 : 10.0 : 59.0, 37.0 : 09.0 : 54.0, 23.0 : 10.0 : 67.0, and 66.5 : 30.50 : 03.0 mol %, respectively. Selective unitary and binary azeotropic compositions were polymerized and the obtained results show good agreement between the theoretical and experimental terpolymer composition for each case. Also, pseudo-azeotropic regions were identified where the deviation between feed and polymer composition is very small. The azeotropic points of the four systems were confirmed using Tarasov et al.’s equations and were found to have satisfactory results.