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本文研究了经丙酮水溶液改性处理后的醋酸纤维素 ( CA)反渗透 ( RO)膜的有机物渗透性。在丙酮改性处理过程 ,透过 CA- RO膜的丙酮溶剂量 ,开始时迅速下降 ,然后逐渐趋于零 ,多孔膜变成了致密均相膜。非对称性的超滤 ( UF)膜、纳滤 ( NF)膜、RO膜 ,分别经丙酮改性处理后 ,甲苯透过膜的渗透速率依次减少。孔径越小、脱盐率越低的 RO膜 ,经改性处理后 ,甲苯渗透速率越小。三醋酸纤维素 ( CTA)与醋酸丁酸纤维素 ( CAB)二组分共混的 CTACAB膜 ,或者与醋酸丙酸纤维素( CAP)三组分共混的 CTACABCAP膜 ,随着实验时间的延长 ,甲苯的渗透速率 ,前者逐渐下降到接近零时趋于稳定 ,后者没有变化。改性的 CA膜和 CTACAB共混膜分离甲基叔丁基醚 ( MTBE) /甲醇 ( Me OH)混合物时 ,渗透通量分别为 835和 2 2 6( g/m2· h) ,渗透物中 Me OH浓度都达到88wt%。
In this paper, the organic permeation of cellulose acetate (CA) reverse osmosis (RO) membranes modified with acetone aqueous solution was investigated. During the acetone modification process, the amount of acetone solvent passing through the CA-RO membrane initially decreased rapidly and then gradually became zero and the porous membrane became a dense homogeneous membrane. Asymmetric ultrafiltration (UF) membrane, nanofiltration (NF) membrane, and RO membrane, respectively, after acetone modified treatment, the permeation rate of toluene through the membrane in order to reduce. The smaller the pore size, the lower the desalination rate of the RO membrane, the modified treatment, the smaller the toluene permeation rate. CTACAB films blended with two components of cellulose acetate triacetate (CTA) and cellulose acetate butyrate (CAB), or CTACABCAP films blended with three components of cellulose acetate propionate (CAP). With the extension of experimental time , The penetration rate of toluene, the former gradually decreased to nearly zero when the tended to be stable, which did not change. The permeation flux of modified CA membrane and CTACAB blend membranes were 835 and 226 (g / m2 · h), respectively, when the methyl tert-butyl ether (MTBE) / methanol (Me OH) Me OH concentration of 88wt%.