Study On Nonafiltration For Concentration Of 6APA

Membrane technology has been an efficient industrialized separation technology. The application areas is being expanded day and day. At present, fermentation industry develops rapidly. It's important to use new separation technology to reform the traditional process. So, fermentation is one of the most perspective areas in which the membrane technology will be applied with the fermentation developing.The application of membrane technology in the production of 6-APA has been studied: nonafiltration(NF) for concentration, membrane fouling and cleaning.The thesis includes three sections:First, some basic knowledge about the membrane separation technology are presented , stressing on NF. The principle of the fouling and cleaning of membrane are introduced, too. The current situation of some applications has been summed up.Second, in the 6-APA concentration experiments, four kinds of NF membrane are used. The thesis focused on the processing parameters, separation efficiency, the product yield, membrane flux, diafiltration and concentration times. The results show that the concentrate quality and yield for NF001 are more excellent than the others used in the experiment. The yield and the concentration times, membrane flux up to 99.4%, 7.5, 44.4LMH, respectively.Third, the configurations of the foulants on the membrane surface have been investigated qualitatively by SEM. After cleaning, the membrane flux and the operating lasting are also studied. The recovering ratio are 96.8%and 88.4, respectively, for S-1# and S-2#. The effects of different cleaning reagents have been compared.