摘要
对采用平均孔径50nm、表面疏水的陶瓷膜脱除油中水分的过程进行了研究,考察了跨膜压差、膜面流速、原料液水含量对膜渗透通量及水截留率的影响.结果表明,采用疏水陶瓷膜脱除异辛烷中水分可得到较好的分离效果;增大跨膜压差或减小原料液水含量可以增加膜稳定通量,而随着膜面流速的增加,膜稳定通量先升后降.实验得出适宜的操作参数为跨膜压差0.1MPa、膜面流速1.67m/s,获得的水截留率均在98%以上.基于所用陶瓷膜稳定的亲油疏水表面,渗透侧水含量在不同的操作条件下变化很小.
Hydrophobic ceramic membranes with the average pore size of 50 nm were employed to remove water from water-in-oil emulsions, in which isooctane and distilled water were selected as continuous and dispersed phase, respectively. The effects of transmembrane pressure, crossflow velocity and feed water content on permeate flux and water rejection were systematically investigated. Either increasing the transmembrane pressure or decreasing the feed water content could improve the permeate flux, and with the increase of crossflow velocity, the permeate flux initially raised and then decreased. The optimal operating conditions were obtained with transmembrane pressure of 0. 1 MPa and crossflow velocity of 1.67 m/s, and the water rejection was stable and as high as more than 98%. It was found that, the water content in the permeate changed little with the operating conditions, owing to the hydrophobic surface of the ceramic membrane.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2012年第3期86-90,共5页
Membrane Science and Technology
基金
国家自然科学基金资助项目(20776067)
江苏省科技支撑计划项目(BE2009677)
关键词
油品脱水
陶瓷膜
疏水表面
膜分离
water removal
ceramic membrane
hydrophobic surface
membrane separation
