摘要
以聚二甲基硅氧烷(PDMS)为原料,甲苯为溶剂,甲基三乙氧基硅烷为交联剂,二丁基二月桂酸锡为催化剂,制得PDMS渗透蒸发膜,以分离因子、渗透通量作为膜分离性能的主要评价指标,研究了交联剂用量及操作条件对膜性能的影响。结果表明,交联剂用量增加,膜对苯酚的选择性增加,渗透通量先上升后下降;料液温度升高,膜的选择性降低,而渗透通量增加;料液浓度增加,膜的选择系数和渗透通量均增加;料液流速加快,膜的渗透通量和选择系数均增加;下游侧压力升高,渗透通量减小,而选择系数增加。在料液温度为60℃、质量浓度为0.5 g.L-1、体积流量为0.6 L.min-1,下游侧压力为6 kPa时,膜的渗透通量为98 mg.m-.2h-1,膜对苯酚的选择系数为5.12。
The PDMS membranes were prepared by using poly dimethyl siloxane （PDMS） as precursor, toluene as solvent, triethoxy methylsilane as cross linker, dibutyltin dilaurate as catalyst. The PDMS membranes were evaluated with permeation flux and separation factor. The effects of cross linker dosage and the operation parameters during the process ofpervaporation were investigated. It was shown from the results that： The selectivity of the membranes increased while the permeation flux first increased and then decreased as the linker dosage increased; the selectivity ofthe membranes decreased while the permeation flux increased as the feed temperature increased; the selectivity and the permeation flux of the membranes both increased as the feed concentration increased; the selectivity and the flux also both inereased as the feed flow rate increased; the selectivity increased while the permeation flux decreased as the separation press increased. When the proportion of the PDMS, solvent, cross linker and catalyst were immobile, The permeation flux and separation factor could be 98 mg·m^-2·h^-1 and 5.12 when the feed temperature was 60 ℃, feed concentration was 0.5 g·L^-1, feed flow rate was 0.6 L·min^-1 and separation press was 6 kPa.
出处
《水处理技术》
CAS
CSCD
北大核心
2010年第1期74-77,共4页
Technology of Water Treatment
