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用活性炭吸附-微波解吸方法回收淡酒液中可利用的乙醇,为淡酒液的回收利用提供一条可供选择的途径。设计了载乙醇活性炭在氮气氛围中微波解吸及真空微波解吸两套试验流程。发现真空条件下解吸的气体组成与氮气氛围中解吸的气体组成相比发生较大变化,系统压力对微波解吸的分离效果影响较大。系统压力降低,气相中乙醇含量增高这一规律在以微波为加热源的情况下依然成立。试验结果表明:当微波功率不低于320 W时,载乙醇活性炭在真空微波系统中100 s后基本解吸完全;质量分数4%~8%的低浓度乙醇水溶液经三次活性炭吸附-真空微波解吸循环后,乙醇浓度可提纯至97%~98%以上。在真空条件下操作,可以增强微波解吸的分离效果,这一规律对活性炭吸附-微波解吸方法处理工业有机废水有理论指导意义。
The recovery of available ethanol from fresh liquor by activated carbon adsorption - microwave desorption provides an alternative route for the recovery of light liquor. Designed two sets of experimental procedures of ethanol desorption and vacuum desorption under nitrogen atmosphere. It is found that the composition of desorbed gas under vacuum changes greatly compared with the composition of desorbed gas in nitrogen atmosphere, and the system pressure has a great influence on the separation effect of microwave desorption. System pressure is reduced, the law of the ethanol content in the gas phase increases with the microwave as a heat source. The experimental results show that when the microwave power is not lower than 320 W, the ethanol-loaded activated carbon is completely desorbed after 100 s in a vacuum microwave system; the low concentration aqueous ethanol solution with a mass fraction of 4% -8% is adsorbed by three activated carbon-vacuum microwave desorption cycles After ethanol concentration can be purified to 97% ~ 98% or more. Operating in vacuum can enhance the separation effect of microwave desorption. This rule has theoretic guiding significance for the treatment of industrial organic wastewater by activated carbon adsorption-microwave desorption.