甘一酯的非等温结晶动力学研究  

Non-isothermal crystallization kinetics of monoglycerides

作　　者：马传国[1,2] 娄丽娟[1,3] 荆运洁[4] 

机构地区：[1]河南工业大学粮油食品学院,郑州450001 [2]粮食深加工国家工程实验室,郑州450001 [3]国家粮食储备局西安油脂科学研究设计院,西安710082 [4]河南工业大学材料科学与工程学院,郑州450001

出　　处：《中国油脂》2013年第1期52-55,共4页China Oils and Fats

基　　金：国家"863"课题(2010AA101506);河南省财政厅粮食专项科技基金项目(ZX20110014)

摘　　要：用差示扫描量热仪(DSC)对甘一酯进行了非等温结晶动力学研究。结果表明:甘一酯的结晶放热峰为双峰,随着降温速率的减慢,结晶所用的时间越长,结晶峰向高温移动,高温结晶峰的结晶焓变减少,低温结晶峰的结晶焓变有所增加,而结晶总焓变是增加的。用Takhor方程和Kissinger方程得到了甘一酯的非等温结晶活化能,高温结晶的活化能分别为-246.73 kJ/mol和-251.63kJ/mol;低温结晶的活化能分别为-99.26 kJ/mol和-103.62 kJ/mol。用莫志深法对甘一酯的结晶动力学机理进行了研究,得到高温峰a值为1.43～1.90,F(T)值为0.77～1.28;低温峰a值为1.20～1.50,F(T)值为1.12～1.60。Differential scanning calorimetry（DSC） was used to study the non -isothermal crystallization ki- netics of monoglycerides （MG）. The results indicated that crystallization exothermic peak of MG was doub- le peaks ; with the decrease of cooling rate, the crystallization time was longer and crystallization peaks shif- ted towards the higher temperature direction; the crystallization enthalpy of crystallization peak at high tem- perature reduced, while crystallization peak at low temperature possessed an opposite behavior, but the to- tal crystallization enthalpy increased. Non - isothermal crystallization activation energy of MG was obtained by Takhor equation and Kissinger equation, and the activation energy of high temperature crystallization was -246. 73 kJ/mol and -251.63 kJ/mol, respectively; the activation energy of low temperature crystal- lization was - 99.26 kJ/mol and - 103.62 kJ/mol, respectively. The mechanism of non - isothermal crys- tallization kinetics of MG was investigated using the Mo. method and the a value of high temperature crys- tallization peak was from 1.43 to 1.90 and the F（T） was from 0. 77 to 1.28 ; the a value of low temperature crystallization peak was 1.20 -1.50 and the F（ T） was from 1.12 to 1.60.

关 键 词：DSC 甘一酯 非等温结晶动力学 结晶机理 

分 类 号：TQ423.2[化学工程]