陶瓷膜分离对氨基苯酚料液中催化剂微粒研究

对陶瓷膜微滤分离净化含骨架镍催化剂的对氨基苯酚料液的工艺进行研究,通过小试实验确定采用孔径为0.2μm的陶瓷膜过滤对氨基苯酚料液,对工业上用过的污染膜和滤饼层的组分分析表明,污染物主要是骨架镍催化剂。提出了工业应用中膜清洗的具体方案,在100℃下用酒精-水溶液清洗膜装置10 min,体积分数为1%的NaOH溶液清洗20 min,体积分数为3%的硝酸溶液清洗1 h,工业软水清洗1 h。经过工厂长期运行,膜的平均渗透通量是400 L/(m2.h),用原子吸收光谱仪在全部过滤运行的渗透液中没有检出镍,可见在工业环境中用陶瓷膜微滤对氨基苯酚料液是一种可靠和有效的净化技术。

Separation of p-Aminophenol From Raney Nickel Catalyst by Ceramic Membrane

Clarification of p-aminophenol feed containing Raney nickel catalyst by micro-filtration(MF) of ceramic membrane has been investigated.The experiments in the lab confirmed filtration the p-aminophenol feed by the ceramic membrane with pore size of 0.2 μm.The component of the cake and fouled membrane in pilot tests were analyzed and found that the pollutants were mainly Raney nickel catalyst.In the industrial application,an effective cleaning method to recover the membrane flux was suggested as follows: firstly washing with circulate solution of alcohol-water for 10 minutes;then rinsing the rig with 1vol% NaOH solution for 20 minutes;and 3% nitric acid solution for 60 minutes;finally industrial soft water for 60 minutes.The above cleaning operations were all performed at 100 ℃.The average permeate flux of a long running in the plant was 400 L/(m2·h).The nickel content in the permeate liquid could not be determined by an atomic absorption spectrometry.So that in industrial conditions the Microfiltration of PAP suspension by a ceramic membrane is a reliable and efficient technology of the clarification.