摘要
对电还原硝基苯（NB）合成对氨基苯酚（PAP）过程中受到污染的Nafion425型阳离子交换膜进行了清洗再生研究．筛选出的较佳清洗剂成分是：脂肪醇聚氧乙烯醚磺酸钠（AES）、十二烷基磺酸钠（ABS）、脂肪醇聚氧乙烯醚琥珀酸单酯磺酸二钠（R-3）、脂肪醇聚氧乙烯醚（JFC）、烷基多糖苷（APG-10）、Tween-60及异丙醇，质量分数分别为：0．15，0．17，0．10，0．05，0．10，0．02及0．05，余量为水；其在线清洗适宜工艺条件为：清洗剂稀释倍数为300，清洗温度60℃，清洗液pH值10～11，清洗时间2～2．5h．实验结果表明，清洗后的膜电阻降为4．812／cm^2左右，与新膜基本相同，膜强度基本不变，扫描电镜（SEM）观察显示其表面形貌与新膜也几乎相同，用于电合成PAP的槽电压降为3．03V左右，与新膜相关数据十分接近．
The cleaning processes of fouled cation- exchange membrane （Nafion425） used in electrochemical reduction of nitrobenzene to p - aminophenol were investigated. A membrane cleaning agent （NA- 1 ） consisted of anionic surfactants（AES,ABS and R- 3）, nonionic surfactants（JFC, APG- 10 and Tween- 60）, isopropanol and water was developed. The factors affecting the cleaning effect of the fouled membrane were investigated. It was found that the optimum online cleaning conditions were as follows： cleaning agent＇s dilution ratio of 300, cleaning temperature of 60℃, cleaning solution＇ s pH value of 10 - 11 and cleaning time of 2 - 2.5 h. The cleaning experimental results show that the membrane resistances of rinsed membranes can be decreased from 5.6 to 4.8Ω/cm^2, which is close to the value of a new membrane, the strength of rinsed membranes is still the same as that of a new membrane and the bath voltages for electrochemical reduction of nitrobenzene with rinsed membranes can be recovered to about 3.03 V, which is close to the value （about 3.00 V） of a new membrane as well. The scanning electron microscopy （SEM） micrographs show the surface morphology of the rinsed membranes is similar to that of a new membrane, which demonstrates the effective cleaning effect of fouled membrane.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2006年第4期52-56,共5页
Membrane Science and Technology
基金
河南省2003年重点科技攻关资助项目(03223023800)
关键词
膜污染
膜清洗
Nation膜
对氨基苯酚
电合成
离子膜
membrane fouling
membrane cleaning
Nafion membrane
p - aminophenol
electrochemical synthesis
ionic exchancane membrane
