响应曲面法优化优先透乙醇渗透汽化复合膜的操作条件  

Optimization of ethanol permselective pervaporation process using surface response methodology

作　　者：祝振洲[1,2] 苏仪[1] 伊守亮[1,2] 周浩力[1,2] 陈向荣[1] 苏志国[1] 万印华[1] 

机构地区：[1]中国科学院过程工程研究所,生化工程国家重点实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《膜科学与技术》2010年第3期70-75,共6页Membrane Science and Technology

基　　金：国家973计划资助课题(2007CB714305)

摘　　要：采用自制的硅橡胶-沸石杂化优先透乙醇渗透汽化复合膜,利用响应曲面法研究原料液温度和循环流速两个参数对乙醇质量分数为4.05%的乙醇-水体系渗透汽化分离过程的影响.试验表明,温度对膜的通量和分离因子都有显著的影响,温度升高通量增加,而在50℃以下分离因子随温度升高而增加,此后分离因子随温度升高而下降.循环流速的增加会导致通量和分离因子的下降.综合考虑分离因子和通量这两个响应值,利用回归方程求得本试验所采用的渗透汽化复合膜在乙醇-水体系中最优操作条件是:温度59.8℃,循环流速30 L/h,此时总通量和乙醇分离因子分别达到242.8 g/(m2.h)和20.6.Using self-made ethanol permselective pervaporation composite membrane, a central composite rotatable design （CCRD） of response surface methodology was used to analyze pervaporation performance of PDMS/PAN membranes for separation of binary ethanol-water mixture. The results show that temperature has the most significant affection on membrane＇s flux and separation factor. The flux and separation factors increase when the temperature increases but the separation factors decrease when the temperature is higher than 50 ℃. The increase of flow rate leads to the decrease of both flux and separation factor. A regression model was used for the pervaporation flux and selectivity as a function of the operating conditions： temperature, and flow-rate. The optimized variables were found to be 59.8 ℃ and 30 L/h for temperature and flow-rate, respectively. Under these conditions the permeate flux is 242. 77 g/（m^2 · h） and the separation factor is 20. 6.

关 键 词：响应曲面 渗透汽化 工艺优化 

分 类 号：TQ028.8[化学工程]