摘要
为有效利用稻壳(rice husk,RH),通过双螺杆挤压技术处理RH制备挤压改性稻壳(extrusion-modified rice husk,ERH)。对比恒温恒湿箱(温度25℃、相对湿度80%)中ERH与RH于不同时间的吸湿性能,研究吸湿动力学模型。在相对湿度80%时,测得吸湿剂在不同温度下的吸湿量,得到吸湿标准态热力学参数。结果表明:ERH吸湿速率大于RH,平衡吸湿量是RH的4.6倍,ERH与RH吸湿过程均符合准二级吸湿动力学模型,说明吸湿过程存在化学吸附;ERH与RH吸湿热力学参数表明吸湿反应是自发、熵增、放热的物理吸附过程,降温有利于吸湿。综上,ERH与RH吸湿反应存在物理吸附与化学吸附的综合吸湿。
In order to make effective use of rice husk(RH),RH was treated by twin-screw extrusion technology to prepare extrusion-modified rice husk(ERH).The hygroscopicity of ERH and RH in constant temperature and humidity box(temperature 25℃and relative humidity 80%)at different time were compared,and the hygroscopic dynamic model was studied.When the relative humidity was 80%,the hygroscopic capacity of hygroscopic agent at different temperatures was measured,and the thermodynamic parameters of the standard state of hygroscopicity were calculated.The results showed that the hygroscopicity rate of ERH was higher than that of RH,and the equilibrium hygroscopic capacity was 4.6 times that of RH.The hygroscopic processes of ERH and RH was in accordance with the pseudo-second order hygroscopicity dynamic model,indicating the presence of chemical sorption in the hygroscopic process.The thermodynamic parameters of hygroscopicity of ERH and RH showed that hygroscopic reaction was a spontaneous,entropy increasing and exothermic physical sorption process,and cooling was conducive to hygroscopicity.In conclusion,there was a comprehensive hygroscopic of physical sorption and chemical sorption in the hygroscopic reaction of ERH and RH.
作者
李艳艳
刘婷婷
王大为
张闪闪
LI Yan-yan;LIU Ting-ting;WANG Da-wei;ZHANG Shan-shan(College of Food Science and Engineering,Jilin Agricultural University,Changchun 130118,Jilin,China;Engineering Research Center of Grain Deep-processing and High-efficiency Utilization of Jilin Province,Changchun 130118,Jilin,China;Scientific Research Base of Edible Mushroom Processing Technology Integration,Ministry of Agriculture and Rural Affairs,Changchun 130118,Jilin,China;Key Laboratory of Technological Innovations for Grain Deep-processing and High-efficiency Utilization of By-products of Jilin Province,Changchun 130118,Jilin,China)
出处
《粮食与油脂》
北大核心
2022年第2期35-38,48,共5页
Cereals & Oils
基金
吉林省科技发展计划项目(20200403165SF)。
关键词
挤压改性
稻壳
吸湿性能
动力学
热力学
extrusion modification
rice husk
hygroscopicity
dynamics
thermodynamics
作者简介
李艳艳(1993-),女,硕士,研究生,研究方向为谷物食品科学与副产物高值化利用;通信作者:刘婷婷(1984-),女,博士,副教授,研究方向为谷物食品科学与副产物高值化利用。
