Tocopherol and fatty acid methyl esters (FAME) were recovered through a process involving acid-catalysed methyl esterification and crystallisation of sterols followed by molecular distillation from rapeseed oil deodoriser distillate (RODD), a by-product of vegetable refining edible oil. The effects of evaporating temperature, feed flow rate and wiper rolling speed on yield of tocopherol were systematically studied by response surface methodology (RSM) based on the separation of fame previously. The first fraction, which was collected at 50℃ at 2.66 Pa, contains mainly hydrocarbons, ketones and aldehydes. The second fraction, which was collected at 100-110℃ at 5.32 Pa, contains mainly FAME and the content of FAME in the second distillate was above 90% by analysis of gas chromatography-mass spectrometry (GC-MS). The fraction collected at 200-230℃C at 2.66 Pa was rich in tocopherol (nearly 35%). The overall recovery of tocopherol and FAME were around 50% and 90%, respectively, of the original content in RODD.

通过测定示踪剂在膨胀床体内的停留时间分布，考察表观流速、装柱高径比、介质颗粒物性等因素对膨胀床的影响，并利用一维轴向扩散模型计算得到了液体轴向扩散系数。结果表明：对于大颗粒、低密度介质的膨胀特性可用Richardson-Zaki方程来描述，各因素对床体内扩散系数的影响可用无因次方程来模拟。