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Benzaldehyde-물-설탕의 3성분계 확산flux에 필요한 3성분계 확산계수를 격막cell 방법으로 측정하였다. 설탕수용액의 농도범위 ( 0~60 wt% )에서 1000 ppm의 미량의 benzaldehyde를 용해하여 25℃의 일정한 온도에서 격막cell을 이용, 확산시킨 후 자외선 분광기 및 굴절계로 비이상성 (nonidealily)을 나타내는 설탕농도의 변화에 따른 benzaldehyde의 활동도계수를 gas-chromatography를 이용 기상분석법으로 측정하였다. 3성분계의 확산flux에 필요한 4개의 확산계수중 ...

Benzaldehyde-물-설탕의 3성분계 확산flux에 필요한 3성분계 확산계수를 격막cell 방법으로 측정하였다. 설탕수용액의 농도범위 ( 0~60 wt% )에서 1000 ppm의 미량의 benzaldehyde를 용해하여 25℃의 일정한 온도에서 격막cell을 이용, 확산시킨 후 자외선 분광기 및 굴절계로 비이상성 (nonidealily)을 나타내는 설탕농도의 변화에 따른 benzaldehyde의 활동도계수를 gas-chromatography를 이용 기상분석법으로 측정하였다. 3성분계의 확산flux에 필요한 4개의 확산계수중 물의 주확산계수는 2성분계 확산계수를 이용하였고 benzaldehyde의 무확산계수 및 상호확산계수는 격막cell 방법에서 유도한 식 및 본 실험에서 측정한 농도차를 이용하여 계산하였으며 나머지 benzaldehyde의 상호확산계수는 Onsager의 reciprocily관계를 이용하여 계산 하였다. 실험결과 benzaldehyde의 주확산계수 및 상호확산계수는 물의 농도변화에 따라 큰 영향을 받으며 benzaldehyde의 주확산계수와 의사2성분계 확산계수는 물의 농도 차가 적을 경우 거의 비슷하다는 결론을 얻었다. 그리고 benzaldehyde의 활동도계수는 설탕의 농도가 커질수록 작아졌다.

Abstract ▼ AI-Helper

The ternary diffusion coefficients of benzaldehyde-water-sucrose were measured with the diaphragm cell at 25℃. Solutions of sucrose ranging from 0 to 60 percent by weight were prepared with distilled water and benzaldehyde of 1,000 ppm was then added as the dilute organic species. The difference in ...

The ternary diffusion coefficients of benzaldehyde-water-sucrose were measured with the diaphragm cell at 25℃. Solutions of sucrose ranging from 0 to 60 percent by weight were prepared with distilled water and benzaldehyde of 1,000 ppm was then added as the dilute organic species. The difference in sucrose concentration and benzaldehyde between the solutions on either side of diaphragm cells were analyzed respectively by refractometer and ultra-violet spectrophotometer at 249.5 nm. And gas chromatographic analysis by direct headspace injection was used in order to measure the activity coefficients of benzaldehyde, by which the extent of nonideality of the system is evaluated, a□□□ function of sucrose concentration. F□□□□□e quation derived in the diaphragm cell and two in □□□□pendent experimental measurements, together with known binary diffusion data for aqueous sucrose soltuion, the three independent ternary diffusion coefficients were determined. The fourth diffusion coefficients was then obtained from these three ternary diffusion coefficients by the use of the Onsager's reciprocity relationship. The experimental results showed that the main and corss diffusion coefficients of benzaldehyde were influenced greatly with the variation of water concentration and the main diffusion coefficients of benzaldehyde was similar to the pseudo-binary diffusion coefficients of that in the case of small difference of water concentration. And the activity coefficients of benzaldehyde decreased with increasing sucrose concentration.

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