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Multiple Reaction Kinetics 에 의한 핏치로부터 메조페이스 형성의 해석
인세진,이진기,김종필,유승곤,이보성 ( S . J . In,J . K . Lee,J . P . Kim,S . K . Ryu,B . S . Rhee ) 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.1
Kinetic studies on the mesophase formation in the pitch were carried out. Naphtha tar pitch(NTP) and straight asphalt(SA) were heat-treated in the temperature range of 410-450℃. The weight loss(V) of the pitches during the reaction was measured and the heat-treated pitches were also fractionated into benzene solubles(R), benzene insolubles/quinoline solubles(S) and quinoline insolubles(C). The kinetics of the mesophase formation can be analysed by the following multiple reaction model in which the rate equation of each step is assumed to be first order: The activation energies(E) of each step for NTP and SA were 15-65 and 29-61 ㎉/mole, respectively. The kinetic studies indicate that the following heat treatment conditions would be appropriate for preparing a spinnable mesophase : -NTP : a lower temperature since E₁<E₂ & E₄ -SA : a higher temperature at an early stage and a lower temperature at a later stage since E₄<E₁<E₂