การแยกอะซิโตไนไทรล์ออกจากสารละลายเจือจางโดยกระบวนการเพอร์แวปพอเรชัน / พนิดา ปรารัตน์ = Separation of acetonitrile from diluted solution by pervaporation process / Panida Prarat
Pervaporation process was examined as a possible technique for separation of acetonitrile from diluted solution by using polytetrafluoro ethylene membrane. The experiments were performed using the feed concentration (5 to 20 vol%), permeate pressure (10 to 40 mmHg), feed temperature (25 to 50 ํC) and feed flow rate (6 to 20 ml/min). The concentration of acetonitrile in the permeate and feed solution were determined by gas chromatography. The results showed that organic flux increased, while water flux decreased with increasing the feed concentration and feed temperature. The organic and water fluxes increased with increasing feed flow rate but increased with decreasing permeate pressure. For the selection factor, it increased with increasing feed temperature, feed flow rate and decreasing permeate pressure but decreased with increasing feed concentration. The optimum conditions of pervaporation process for separation of acetonitrile from diluted solution were obtained at the feed concentration of 5 vol%, permeate pressure of 10 mmHg, feed temperature of 40 ํC and feed flow rate of 20 ml/min. The comparison of pervaporation process performance indicated that the separation of acetonitrile from HPLC wastewater did not differ from acetonitrile-water mixtures. In addition, wastewater treatment and recovery efficiency were 33.46% and 33.60%, respectively.