This paper reports the study on the phase transition and classification of critical points in the multistability chemical reaction systems. It is demonstrated that the higher the order of the multistability, the wider variety of phase transitions. A classification scheme of critical points according to the stability criteron and the continuity of thermodynamic functions is suggested. It is useful for us to study critical phenomena especially in the nonequilibrium systems including the multistable chemical ones.

Key words: PHASE TRANSFORMATION, CRITICAL POINTS, NON LINEAR, CHEMICAL REACTION