乙醇-水体系在马铃薯粉吸附剂上的气相吸附过程研究

Study on Vapor Adsorption Process of Ethanol-water System on Potato Powder

利用固定床吸附柱(φ25 mm×900 mm)对乙醇-水体系在马铃薯粉吸附剂中的气相吸附过程进行了研究,研究了不同条件下乙醇-水体系在马铃薯粉中吸附的透过曲线。结果表明,在本试验条件下,生产能力和透过时间随温度降低、粒径变小、进料流量降低和床层高度增加而增大。在乙醇-水体系进料流量为3 mL/min左右、床层温度80℃、吸附剂粒径245～350μm、床层高度700 mm和进料乙醇体积分数94.5%条件下,每1 000 g马铃薯粉吸附剂可脱水得到无水乙醇205.1 g。马铃薯粉吸附性能良好,再生容易,具备作为生物质吸附剂制备无水乙醇的潜力。

Experiments have been carried out in a fixed bed adsorption column （ 6 25 mm× 900 mm） packed with potato powder. The effects of different adsorption process conditions were investigated. The results showed that under the experimental condi- tions, the production capacity and breakthrough time of potato for alcohol-water systems increases when the temperature falls, reduce, the size of adsorbent become smaller and the bed depth increases. The adsorption capacity was 205.1 g/l 000 g adsorbent at 80 ~C, inlet ethanol concentration 94.5% （ volume fraction）, the size of adsorbent 245 ~ 350 ~m, the bed depth 700 mm and vapor superficial velocity 3 mL/min. The potato powder is a potential biomaterial for removing water from ethanol-water mixtures.