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设计了载乙醇活性炭真空微波解吸的试验流程,采用近似法测定了载乙醇活性炭真空微波解吸的出口浓度曲线。阐述了在真空条件下微波解吸负载有水和乙醇这类低沸点化合物的活性炭的机理,对真空微波解吸的分离过程进行了分析。试验结果表明:在各种微波功率下,中期乙醇出口浓度均高于前后期;在320 W微波功率下,80 s即出现乙醇出口质量分数的最高峰值54%;在680 W微波功率下,60 s即出现乙醇出口质量分数的最高峰值64%;质量分数4%的低浓度乙醇水溶液经两次活性炭吸附-真空微波解吸循环后,乙醇出口质量分数的峰值可达96%以上。
The experimental procedure of vacuum microwave desorption of ethanol-activated carbon was designed. The outlet concentration curve of vacuum microwave desorption of ethanol-activated carbon was determined by the approximate method. The mechanism of microwave desorption of activated carbon loaded with low boiling point compounds such as water and ethanol under vacuum was described. The separation process of vacuum microwave desorption was analyzed. The experimental results showed that the ethanol concentration at the middle stage was higher than that at the early stage and the middle stage at all microwave power levels. The highest peak value of the ethanol concentration was 54% at 80 s under the microwave power of 320 W. At 680 W microwave power, s, the highest peak value of ethanol export mass fraction is 64%; the peak value of mass fraction of ethanol export mass fraction reaches more than 96% after twice activated carbon adsorption-vacuum microwave desorption cycle with 4% mass fraction of low concentration ethanol solution.