中空纤维膜吸收甲苯气体
更新时间：2014-07-17 10:30
来源：环境工程学报
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阅读：1809
| 中文摘要: |
| 采用疏水性聚偏氟乙烯(PDVF)中空纤维膜为气液接触膜,n-甲酰吗啉(NFM)水溶液为吸收剂,研究了膜吸收技术分离甲苯/空气混合气的性能。考察了进气气体浓度、气体停留时间、吸收液体积分数和吸收液流量等诸因素对分离性能的影响。研究结果表明,膜吸收技术可以有效地分离甲苯/空气混合气,甲苯去除率可达90%;提高NFM吸收液的浓度和流量可同时增加甲苯的去除效率η和总传质系数K;气体停留时间的减小导致η降低,K反而增大;进气甲苯浓度的增加导致η下降,同时降低总传质系数K。 |
| 英文摘要: |
| 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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