摘要
针对醇氨法脱除柴油中环烷酸技术存在的溶剂回收过程能耗大的问题,制备出聚酰亚胺纳滤膜以分离环烷酸和溶剂,考察了铸膜液表观黏度、铸膜液挥发时间、凝固浴组成等膜制备工艺对膜通量和截留率的影响,同时考察了抽提液中环烷酸盐质量分数和操作压力等使用条件对膜分离性能的影响规律。结果表明:所得纳滤膜的通量超过17 L.m-2.h-1,截留率超过50%;使用黏度为310 mPa.s的铸膜液、在60 s铸膜液挥发时间、使用纯乙醇为凝固浴可得到综合性能最佳的纳滤膜;提高抽提液中环烷酸盐质量分数,膜通量下降,但对截留率基本无影响;升高操作压力,膜通量和截留率均增大。
The ethanol-ammonia chemical extraction technology for removing naphthenic acid from diesel has a disadvantage of high energy consumption in the so/vent recovery process. To solve this problem, polyimide nanofiltration membrane was prepared to separate naphthenic acid from solvent in the extraction. The influences of membrane preparation parameters such as apparent viscosity of the casting solution, the volatilization time and the composition of solidification liquid on permeation flux and rejection of naphthenate were investigated. The influences of operation conditions such as concentration of naphthenate in extraction and operation pressure on separation performance were also studied. The permeation flux of membrane can reach 17 L · m^-2· h^-1 and the rejection is over 50%. The results show that the membrane with optimal separation performance can be obtained under the conditions of using casting solution with viscosity of 310 mPa · s, volatilization time of 60 s and ethanol solidification liquid. The ascent of naphthenate concentration decreases the permeation flux, but has little effect on the rejection of naphthenate. The permeation flux and rejection increase along with the rising of operation pressure.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第2期144-148,共5页
Journal of China University of Petroleum(Edition of Natural Science)
关键词
环烷酸
醇氨抽提液
聚酰亚胺纳滤膜
制备
分离性能
naphthenic acid
ethanol-ammonia extraction
polyimide nanofiltration membrane
preparation
separation performance
