Clean Technology (청정기술)
- Volume 12 Issue 3
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- Pages.157-164
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- 2006
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- 1598-9712(pISSN)
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- 2288-0690(eISSN)
Purification of Naphthalene from Naphthalene and 2-methylnaphthalene System by Layer MelMelt-Crystallization
경막형 용융결정화에 의한 나프탈렌과 2-메틸나프탈렌 혼합물로부터 나프탈렌의 분리
- Koh, Joo-Young (Chemical Process and Engineering Center, Korea Research Institute of Chemical Technology) ;
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Kim, Chul-Uog
(Chemical Process and Engineering Center, Korea Research Institute of Chemical Technology) ;
- Park, So-Jin (Department of Chemical Engineering, Chungnam National University)
- Received : 2006.05.29
- Accepted : 2006.08.23
- Published : 2006.09.30
Abstract
In order to purify 2-methylnaphthalene as main impurity included in naphthalene, SLE (solid-liquid equilibria) on two components system including naphthalene and 2-methylnaphthalene were measured and a layered melt crystallization has been studied. SLE in the present system is shown a simple eutectic mixture and the experimental results using DSC method is similar to the static method. Purity and yield of naphthalene in crystal depended mainly on the cooling rate: Increasing cooling rate, the purity of naphthalene in crystal increase, whereas the yield of that decrease. The effective distribution coefficient (Keff) as the degree of impurity removal was observed to decrease with decreasing of cooling rate. Therefore, the purity of naphthalene by melt crystallization can be enhanced to 5~7 %.
나프탈렌에 포함된 주요 불순물이 2-메틸나프탈렌을 정제하기 위해, 나프탈렌과 2-메틸나프탈렌의 2성분계에 관한 고액상평형 데이터를 측정하였으며, 경막형 용융결정화에 관한 실험을 실시하였다. 이러한 2성분계의 고액상평형은 단순 고용계를 형성하였는데, 시차주사 열량분석에 의한 열분석 방법과 정적인 방법에 의해 측정한 결과는 거의 유사하였다. 결정화 실험에서 나프탈렌의 순도와 결정의 수율은 냉각속도에 주로 의존하였는데, 냉각속도가 낮을 수 록 나프탈렌의 순도 및 수율은 증가하는 경향을 나타내었으며, 분리정제 효율의 척도인 유효분배계수는 냉각속도가 증가함에 따라 감소하는 경향을 나타내었다. 결과적으로, 용융결정화에 의해 나프탈렌의 순도는 약 5 ~ 7% 정도가 증가하였다.
Keywords