Korean Chemical Engineering Research, Vol.44, No.3, 259-264, June, 2006
염화반응법으로 제조된 TaCl5의 분리공정에 관한 비교 연구
A Comparison Study on the Separation Process of TaCl5 from the Chlorinated Reaction Product
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초록
염화반응에 의한 TaCl5의 제조에서 반응생성물 중 NbCl5, TiCl4, FeCl2 등이 주요 불순물로 존재하게 된다. TaCl5와 NbCl5는 증류나 수소 환원법에 의해 쉽게 분리가 되므로, 반응생성물에서 TaCl5/NbCl5 혼합물을 99.9% 이상 순도로 분리하기 위해 2기의 연속식 증류공정을 사용하여 light한 성분과 heavy한 성분을 제거하는 공정을 구성하였다. 본고 에서는 순차배열(direct sequence)과 비 순차배열(indirect sequence)으로서의 두 분리공정에 대한 비교연구를 상용성 화학공정모사기인 Aspen Plus 13.1을 이용해서 전산모사를 수행하였다. 비교결과 순차배열이 비 순차배열에 비하여 초기 장치투자비용이나 운전비용에서 좀 더 우수한 것으로 나타났다.
The separation and purification of TaCl5 is indispensable in the synthetic process of TaCl5 by chlorination of tantalum oxide. The reaction products are mainly TaCl5, NbCl5, TiCl4 and FeCl2. However, we need to separate TaCl5/NbCl5 mixture from the reaction product, because TaCl5 and NbCl5 are easily separated each other by distillation or hydrogen reduction process. In this work, a comparison study was carried out between direct sequence and indirect sequence to obtain TaCl5/NbCl5 mixture from the reaction product by removing light component, TiCl4 and heavy component, FeCl2 using two distillation columns. It was concluded that the direct sequence gave better results than indirect sequence in the aspect of initial capital costs and the associative operating costs.
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