磁化甘蔗混合汁微滤过程中膜面吸附对传质模型的影响  

Effect of surface adsorption of microfiltration for magnetized sugarcane mixed juice on model of mass transfer

作　　者：马森[1] 高俊永[2] 

机构地区：[1]河南工业大学粮油食品学院,郑州450001 [2]广州甘蔗糖业研究所,广东省甘蔗改良与生物炼制重点实验室,广州510316

出　　处：《农业工程学报》2015年第8期296-301,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(31301594);河南工业大学河南省省属高校基本科研业务费专项资金项目(2014YWQQ02);河南工业大学高层次人才基金(2012BS031)

摘　　要：为研究磁化甘蔗混合汁微滤膜分离过程,分析膜面吸附作用对传质过程的影响。以甘蔗混合汁为原料,研究了磁化甘蔗混合汁在微滤过程中质量传递模型。在不考虑膜表面层的吸附作用下,0.45和0.20μm陶瓷微滤膜分离的传质系数分别为-81.406和-83.130,回归方程的决定系数R2分别为0.921和0.920,P值分别为0.002和0.010;考虑膜表面层的吸附作用,0.45和0.20μm陶瓷微滤膜分离的传质系数分别为-323254.006和573281.937,吸附系数分别为0.995和0.994,回归方程的决定系数R2分别为0.939和0.999,P值分别为0.015和0.0008,可见,对于上述磁化条件和膜分离过程进出口操作压力差0.03~0.04 MPa,控制温度（35±1）℃,全回流试验条件下,膜面吸附作用对微滤膜分离过程传质模型影响显著（P〈0.05）。该研究有助于微滤膜分离设备的选型设计参数和操作条件的优化。Chemical substances such as lime, phosphate and sulfur dioxide are needed in the sugar refinery process, resulting in high COD （chemical oxygen demand） of factory sewage and high cost. Membrane technology has the advantages of low energy consumption, no phase change and molecular screening, which may improve the clarification effect of mixed sugar juice and reduce the chemical adding quantity. However, the concentration polarization phenomenon causes the decrease of membrane flux, so a more effective method is needed in order to improve the membrane process for the clarification of sugar mixed juice. Magnetic field combined with microfiltration process is a key issue in recent years, but there are few researches about the proper mass transfer phenomenon. So, the mass transfer modeling of microfiltration process for magnetic cane mixed juice was studied in this paper. By analyzing the mechanism of mass transfer process on the membrane surface, the mass transfer model of microfiltration was deduced according to the theory of osmotic pressure and gel layer. However, the sugar cane mixed juice suffered different adsorption effects on the membrane surface and concentration polarization layer. The forming trend of the adsorbed layer on the membrane surface had close relationship with its surface properties. Therefore, adsorption effect was considered in the process of deducing model. The mass transfer modeling of microfiltration process for magnetic cane mixed juice was deduced at two important cases under the optimum magnetic conditions. Without considering the adsorption of membrane surface layer, the mass transfer coefficient of 0.45 μm ceramic microfiltration membrane for separation was -81.406, the regression equation was significant, and the value of R2 was 0.921. While the mass transfer coefficient of 0.20 μm ceramic microfiltration membrane for separation was-83.130, the regression equation was significant, and the value of R2 was 0.920. When considering the adsorption of membrane surface layer, the mass

关 键 词：膜 模型 传质 磁化甘蔗混合汁 浓差极化 

分 类 号：TQ028[化学工程]