本實驗中，將廢白土置於方形高溫爐中，在空氣流量中為5 mL/s，溫度為500℃及時間為50分鐘的條件下煆燒，使它成為再生白土。利用感應耦合電漿質譜儀、X光繞射分析儀、掃描式電子顯微鏡、表面積測定儀、密度測量儀、水份天平及pH計對活性白土及再生白土進行組成分析及物理性質之觀察或測定。
接著，以再生白土為吸附劑在氮氣流下，對脫酸大豆油進行脫色。以氧化還原滴定的方式量測出脫色前及脫色後油中的過氧化物值。探究操作變數對過氧化物值變化的影響。
過氧化物值變化的動力學研究結果顯示：在氮氣流下、降低白土粉粒大小、提高過氧化物初始濃度、提高白土/油比值、提高攪拌速率或提高吸附溫度都可提升大豆油中過氧化物值的下降速率。而改變氮氣流量或白土含水量時，過氧化物值的下降速率不會受到影響。
根據實驗數據所迴歸出的油中過氧化物值變化的方程式為：

Ln(C/C0)=-1.523×10^8×exp(-45,000/RT)×d^-0.988×(C0/-0.4+0.7×(C0))×r2^1.605×s^0.805×t^0.5

Spent clay was regenerated in a box furnace under the following conditions : air flowrate 5 mL/s, temperature 500℃ and time 50 min. The composition and physical properties of the activated clay and the regenerated clay were determined by an inductively coupled plasma-mass spectrometer (ICP-MS), an X-ray diffractometer (XRD), a scanning electron microscope (SEM), a surface area meter, a density meter, a moisture determination balance, and a pH meter, respectively.
The regenerated clay thus produced was employed in bleaching water-degummed and alkali-refined soy oil. Peroxide values in the oil before and after bleaching were determined by oxidation- reduction titration. The influences of operation variables on the variation rate of peroxide value were investigated.
Experimental results indicated that the peroxide value in the oil was found to be reduced monotonically with bleaching time. The rate of reduction was increased by bleaching in nitrogen steam, decreasing particle size of clay or increasing initial peroxide value, ratio of clay/oil, agitation speed or bleaching temperature. The flow rate of nitrogen stream or water content of clay, however, was found not to influence the rate.
Based on the data obtained, the expression of variation of peroxide value was regressed as

Ln(C/C0)=-1.523×10^8×exp(-45,000/RT)×d^-0.988×(C0/-0.4+0.7×(C0))×r2^1.605×s^0.805×t^0.5

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