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초임계 유체에 의한 Wool Grease의 탈착에 미치는 Cosolvent의 영향
The Effect of Cosolvent on Desorption of Wool Grease with Supercritical Fluid
HWAHAK KONGHAK, April 1993, 31(2), 229-234(6), NONE
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Abstract
양모에 부착되어 있는 wool grease에 대하여 0.6-4.4mol%의 cosolvent를 포함하는 초임계 이산화탄소를 용매로 사용한 탈착 실험을 313.2-333.2K와 15-35MPa의 조건에서 수행하여 탈착 특성을 조사하고 이를 이론적으로 검토하였다. Wool grease의 탈착속도는 cosolvent의 농도가 증가할수록 증가하며, 온도는 증가할수록 감소되고 압력이 증가할수록 현저하게 증가한다. 최종탈착율은 주어진 조건에서 거의 일정한 값을 가진다. 위의 탈착실험조건에서 동일 농도의 cosolvent를 사용한 경우, benzene이 n-hexane과 methylacetate보다 더 좋은 탈착율을 나타내는 가장 좋은 cosolvent임이 확인되었다. 일정한 압력과 cosolvent의 농도에서 탈착 속도정수 k1은 거의 일정한 값을 나타내었으며, k2는 탈착율이 클수록 증가하였다. 추출된 wool grease를 HPLC로 분석한 결과 조건에 따라 탈착성분의 조성이 변함을 확인하였다.
We have studied experimentally and theoretically the desorption characteristics of wool grease on the wool with supercritical carbon dioxide, contiaining 0.6-4.4mole% of cosolvent, at the pressures up to 35MPa, the temperature of 313.2K, 323.2K and 333.2K and constant flow rate of solvent. Desorption rates of wool grease are found to increase with the concentration increase of cosolvent, to decrease generally with the temperature increase and to increase markedly with increasing pressure. The final desorption amounts are nearly constant at a specified condition. Benzene is proved to be a better cosolvent than n-hexane or methylacetate of the same concentrations in above desorption experiments. The desorption rate constants in the model, k1 is nearly constant at constant pressure and concentration of cosolvent, k2 increases with the increase of desorption amount. HPLC chromatograms of the wool grease desorbed show that compositions of the desorpted wool grease are varied with various desorption conditions.
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