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납사 타르 핏치로부터 메조페이스 형성시 교반속도와 N2-blowing속도의 영향

Effect of Stirring Speed and N2-blowing Rate on Mesophase Formation from Naphtha Tar Pitch

HWAHAK KONGHAK, June 1989, 27(3), 291-298(8), NONE
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Abstract

납사 타르 핏치(Naphtha tar pitch)를 410-450℃에서 열처리하여 메조페이스 핏치를 제조할 때 교반 속도와 N2-blowing 속도가 이의 형성에 미치는 영향에 대하여 검토하였다. 메조페이스 함량은 agitator Reynolds number(NRe,a)와 질소가스의 superficial velocity가 증가함에 따라 증가하였으나 이들이 각각 24, 5, 31, 4cm/min이상에서는 오히려 감소하는 경향을 나타내었다.
메조페이스는 교반에 의해 변형되었고, agitator Reynolds number의 증가에 따라 교반 방향으로 배향되어 침상구조를 나타내었으며, 배향의 정도는 교반속도에 크게 의존하였다. 변형된 메조페이스는 annealing에 의해 구형으로 재변형되었다.
The effect of stirring speed and N2-blowing rate on the mesophase formation during the heat treatment of Naphtha tar pitch at 410-450℃ was investigated. The mesophase content was found to increase with agitator Rey-nolds number and superficial velocity of N2 gas. However, the mesophase content decreased slightly when the agitator Reynolds number and superficial velocity of N2 gas were above 24.5, 31.4cm/min respectively. It was also found that the mesophase was deformed by stirring and needle like structures aligned to stirring direc-tion were observed with increasing agitator Reynolds number. The degree of alignment caused by the stirring depend-ed on the stirring speed. The mesophase deformed was rearranged to the spheres by annealing.

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