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1 INTRODUCTIONVapor-liquid equilibrium(VLE)data are useful for the study of solution properties ofnon-ideal mixtures as well as for the design of the separation equipment.Then-methylpyrrolidone(NMP)is a new-type and excellent solvent which can be used in somechemical engineering separation processes.The NMP sucks up moisture so easily that it isnecessary to study the VLE relations of the NMP-H_2O binary system,
1 INTRODUCTION Vapor-liquid equilibrium (VLE) data are useful for the study of solution properties ofnon-ideal mixtures as well as for the design of the separation equipment.Then-methylpyrrolidone (NMP) is a new-type and excellent solvent which can be used in somechemical engineering separation processes. NMP sucks up moisture so easily that it isnecessary to study the VLE relations of the NMP-H_2O binary system,