微波加热脱附回收Y分子筛吸附的酮类有机分子

Desorption and recovery of ketone organic molecules on Y-zeolite adsorber under microwave irradiation

微波再生技术被广泛认为是一种高效节能的绿色再生技术。采用3种不同Si/Al比的分子筛Na Y(Si/Al=3.8)、USY-1(Si/Al=4.1)、USY-2(Si/Al=7.6)作为吸附剂,3种分子结构不同的酮类物质环己酮、丁酮、丙酮作为吸附质,解决目前吸附酮类物质难再生的问题,开发一种新型有效可行的分子筛-酮类物质微波加热再生技术。通过实验结果分析,微波法对酮类有机物具有较高的脱附速率,可在较短的十几分钟内快速完成脱附,脱附率可达90%以上,残留量较少;Y分子筛表面无明显缩聚反应中毒现象;且经多次吸附/脱附循环再生后晶相结构保持稳定,可多次循环使用;脱附后有机物可直接液态回收再利用。

Microwave regeneration technology is recognized as a high-efficiency and energy-saving regeneration technology. Using a new type of effective Y-zeolite adsorption / desorption microwave heating system developed in this work,we studied the desorption of cyclohexanone,butanone,acetone onto the three commercial zeolites Na Y( Si / Al = 3. 8),USY-1( Si / Al = 4. 7) and USY-2( Si / Al = 7. 2) under microwave irradiation. The results show that the high desorption efficiency above 90% can be achieved on Y-zeolite not above 10 minutes. The absence of adsorbent poisoning which due to polycondensation reaction of ketones organic occuring on the surface of zeolite can be observed. After several adsorption / desorption cycles under microwave irradiation,Y-zeolites present as relatively stable crystal structure which can be totally reused. The desorption products can be recovered and reused directly in liquid.