中空纖維膜吸收甲苯氣體
更新時(shi)間(jian)：2014-07-17 10:30
來源(yuan)：環境工程(cheng)學報
作(zuo)者:
閱讀：1972
| 中文摘要: |
| 采用疏水性聚偏氟乙烯(PDVF)中空纖維膜為氣液接觸膜,n-甲酰嗎啉(NFM)水溶液為吸收劑,研究了膜吸收技術分離甲苯/空氣混合氣的性能。考察了進氣氣體濃度、氣體停留時間、吸收液體積分數和吸收液流量等諸因素對分離性能的影響。研究結果表明,膜吸收技術可以有效地分離甲苯/空氣混合氣,甲苯去除率可達90%;提高NFM吸收液的濃度和流量可同時增加甲苯的去除效率η和總傳質系數K;氣體停留時間的減小導致η降低,K反而增大;進氣甲苯濃度的增加導致η下降,同時降低總傳質系數K。 |
| 英文(wen)摘要: |
| A new technique for separation of toluene /air with aqueous solution of n-formyl morpholine (NFM) by hollow fiber PDVF membrane contactor was evaluated, where hollow fiber PDVF membrane as contactor and aqueous solution of n-formyl morpholine (NFM) as absorbent. During the experiment, the effects of inlet concentration, empty bed residence time (EBRT), absorbent concentration and spray flow rate on the removal efficiency were investigated. The results showed that membrane absorption technology can separate toluene from air effectively and the toluene removal efficiency achieved more than 90%. In addition, toluene removal efficiency (η) and the overall coefficient of mass transfer (K) increased with increasing NFM absorbent concentration or spray flow rate. With increasing EBRT, η decreased, whereas K increased. When inlet concentration of toluene increased, η and K decreased. |
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