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이성분계 물질을 함유한 다공성 물질 건조공정의 선택성
Selectivity of the Drying Process of Porous Materials Containing Binary Mixture
HWAHAK KONGHAK, December 1995, 33(6), 771-779(9), NONE
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Abstract
이성분계 혼합물을 함유하는 다공성 물질의 건조시 잔류하는 혼합물의 농도는 어떤 한 성분이 우선적으로 제거되는 건조공정의 선택성에 의하여 변한다. 건조공정의 선택성은 주어진 건조조건에성의 평형상태, 기상 및 액상측 물질전달 현상에 의존한다. 이로 인하여 공비점을 가지는 혼합물의 건조시 건조공정의 선택성에 의하여 휘발성이 낮은물질이 우선적으로 제거되기도 한다. 특히, 액상측물질 전달 현상은 정속구간과 감속구간에서 서로 상이하며, 다공성 물질의 특성에도(모세관의 크기 및 길이)좌우한다. 이러한 특성 때문에 액상측 물질전달현상이 선택성에 미치는 영향은 매우 중요하다. 본 연구에서는 액상측 물질전달 현상이 선택성에 미치는 영향을 조사하기 위하여 건조물체 내의 농도 및 함량분포를 측정하였다.
The concentration of the mixture changes during the drying process of porous materials containing binary mixture, when a component is removed preferentially, so called the selectivity of the drying process. The selectivity depends on the phase equilibria, gas-and liquid-side mass transfer for given drying conditions. For this reason the less volatile component can be removed preferentially during the drying of porous materials containing binary mixture with azeotrope point. The liquid-side mass transfer rate of the constant rate period differs from that of the falling rate period. The liquid-side mass transfer rate depends on the characteristic of the porous materials(size and length of the capillary). The distribution of the concentration and the content of the binary mixtures in the porous materials were determined to investigate the influence of the liquid-side mass transfer on the selectivity.
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