Variation of Peroxide Value in Water-degummed and Alkali-refined Soy Oil during BleachingProcess

• Main Authors: Yun-Kai Wang, 王韻凱
• Other Authors: Chun-I Lin
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/89069672277767293540

碩士 === 國立臺灣科技大學 === 化學工程系 === 93 === 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/Co)=-1.523×10^8×EXP(-45,000/RT)×d^-0.988×(C0/(-0.4+0.7CO))×r2^1.605×s^0.805×t^0.5