摘要
采用乙醇洗涤、次氯酸钠水溶液浸泡的方法,去除商品化的聚偏氟乙烯中空纤维膜中的亲水性成分,使之恢复本征的疏水性并用于膜吸收过程。以单乙醇胺、二乙醇胺、三乙醇胺、氢氧化钠、纯水做吸收剂,对混合气体中CO2进行吸收试验。试验考察了膜有效长度、吸收剂种类、吸收剂浓度、操作温度、气相流速对CO2的脱除率和传质系数的影响。结果表明:(1)使用单乙醇胺做为吸收剂,CO2脱除率高且回收方便,且对膜损坏小;(2)高温不利吸收,但影响不大;(3)气速增大,CO2的吸收率下降并且影响传质速率;(4)稳定性实验表明,一定条件下,处理后的膜在0～28 h内都能保持100%的去除率,而原膜一般低于90%。
Commercially available poly （vinylidene fluoride） hollow fiber membranes were post-treated by ethanol and sodium hypochlorite to remove hydrophilic components, and then utilized in membrane absorption experiments. The absorption of CO2 from a gas mixture was investigated using MEA, DEA, TEA, NaOH and water as absorbents. Effects of some relevant parameters such as fiber length, absorbent concentration, operation temperature and gas-flow rate on both CO2 absorption and mass transfer rate were studied. Results showed that MEA was the most suitable absorbent for CO2 removal. The absorption and mass transfer improved with the increase of fiber length and absorbent concentration. However, the increase of gas flow rate led to the decline of absorption rate. The stability of device was also tested, showing that CO2 removal was nearly complete during a trial period of 28 h for post-treated hollow fiber membranes. The removal efficiency was below 90% for the membranes without any treatment.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2013年第9期149-153,共5页
Environmental Science & Technology
关键词
聚偏氟乙烯
膜接触器
疏水性
二氧化碳
传质
吸收率
poly（vinylidene fluoride）
membrane contactor
hydrophobic
CO2
mass transfer rate
absorption rate
