聚环糊精填充PDMS渗透蒸发膜分离苯酚水溶液

Pervaporation separation of phenol aqueous solution using cyclodextrin polymer-filled PDMS membranes

以聚二甲基硅烷为预聚体,正硅酸乙酯为交联剂,二丁基二月桂酸锡为催化剂,三氯甲烷或正庚烷为溶剂,通过相转化法制备得到了空白聚二甲基硅氧烷(PDMS)膜和聚环糊精(CDP)填充PDMS(CDPfPDMS)膜.考察了空白PDMS膜和CDPfPDMS膜对苯酚水溶液的渗透蒸发分离性能,证明填充膜优于空白膜.还分别考察了溶剂类型、填充剂用量等制膜因素和操作温度、原料液流量、原料液浓度等操作因素对PDMS膜的渗透蒸发分离性能的影响.当温度为60℃,CDP填充量为1%(质量)时,CDPfPDMS膜的渗透通量和分离因子分别可达32.0g·m-2·h-1和7.2.

The PDMS and CDP-filled PDMS membranes were prepared by the phase inversion approach using polydimethylsiloxane as precursor, tetraethyl orthosilicate as crosslinker, dibutyltin dilaurate as catalyst and chloroform or heptane as solvents. Pervaporation separation of phenol aqueous solution using unfilled PDMS and CDP-f-PDMS membranes was investigated. It was demonstrated that the separation performance of PDMS membranes was improved by incorporating CDP into PDMS membrane. The effects of solvent type and filling amount of CDP on pervaporation properties were examined. The effects of the operation parameters including feed temperature, feed flow rate and feed concentration on pervaporation properties were also investigated. The permeation flux and separation factor could be 34.5 g ·m^-2·h^-1 and 10.3 when the experimental temperature was 67℃ and the filling amount is 2%.