共查询到19条相似文献,搜索用时 140 毫秒
1.
2.
3.
以10%(体积分数)LIX984N/煤油为液膜相,2 mol/L硫酸溶液为反萃相,研究了中空纤维更新液膜(HFRLM)技术对模拟电镀废水中二价铜离子的去除及浓缩效果,并讨论了停留时间对二价铜离子去除率的影响.结果表明,中空纤维更新液膜技术可同时实现废水中二价铜离子的分离与富集.经7级处理后,废水中二价铜离子的含量低于1.0 mg/L,二价铜离子的去除率为99.0%,达到国家排放标准;富集液中二价铜离子的浓度达1700 mg/L,富集因子为25.中空纤维更新液膜技术在含铜废水处理方面具有广阔的应用前景. 相似文献
4.
5.
本文就复合中空纤维超滤膜的制备工艺和成膜条件对膜性能影响进行了系统的研究,实验表明,对外压式中空纤维膜,内凝固液条件的改变,主要影响复合膜的内致密层,进而影响膜的透过通量,但对膜的截留孔径无影响,随空中行走距离增大,膜的透过通量减小,截留孔径增大。另外,通过基膜的选定与内凝固液的调节,复合中空纤维膜的分离孔径主要取决于复合层膜,即在适宜的条件下,基膜不影响复合膜的分离孔径,同时也不决定复合中空纤维 相似文献
6.
采用聚丙烯中空纤维微孔膜的减压膜蒸馏技术对氯化钠、氯化钙和硫酸镁等盐溶液进行脱盐处理,考察了料液温度、料液流量、料液浓度和冷测真空度对膜的渗透通量和去除率的影响。实验表明:随着真空度及料液流量、温度的提高,膜的渗透通量有增加的趋势。在相同条件下处理不同的盐溶液,膜的渗透通量相差不大,膜的去除率达到99%以上。使用0.5mol/L盐酸以及0.05mol/L EDTA清洗被污染的膜效果最明显,可迅速有效地将附着在中空纤维膜上的无机污染物去除,使膜渗透通量得到基本恢复。 相似文献
7.
8.
9.
在对中空纤维膜萃取以及螺旋管技术进行充分调研的基础上 ,选择水 -苯酚 - 30 %TBP煤油为实验体系 ,溶质由水相萃取到有机相 ,在不同结构的单束螺旋状中空纤维膜器中研究了螺旋管纤维膜管内外流速以及螺旋管结构等因素对传质系数的影响 .实验结果表明 ,螺旋管中空纤维膜可以有效地提高中空纤维膜的传质特性 .随着管内流速的增加 ,传质系数将有很大提高 ,而管外流速对于传质系数的影响则较小 .至于螺旋结构的影响为 :随着螺旋内径的减小或者是螺旋螺距的减小 ,总传质系数相应地有很大提高 .最后得到了在本实验条件下计算总传质系数K的关联式 相似文献
10.
11.
《分离科学与技术》2012,47(5):1181-1197
Abstract In this paper, hollow fiber renewal liquid membrane (HFRLM) and hollow fiber supported liquid membrane (HFSLM) were used to simultaneously remove and recover copper(II) from aqueous solutions, and the transport performance of these two techniques were compared under the similar conditions for the system of CuSO4 +D2EHPA in kerosene +HCl. The results showed that the HFRLM process was more stable than the HFSLM process. The HFRLM process had a higher overall mass transfer coefficient than that of HFSLM process in single-pass experiments. These were because the renewal effect of the liquid membrane layer could reduce the mass transfer resistance of the lumen side and replenish the loss of the membrane liquid in the HFRLM process. The transport results were better in the HFRLM process than that in the HFSLM process with recycling experiments. Therefore, HFRLM technique is a promising method for simultaneous removal and recovery of heavy metal from aqueous solutions. 相似文献
12.
以LIX984N为载体,煤油为稀释剂,H2SO4为反萃剂,研究了中空纤维更新液膜过程中铜的传递行为。考察了两相压差、铜离子浓度、两相流速、操作方式以及膜丝有效长度等对传质过程的影响。结果表明:膜丝两侧的操作压差对传质过程几乎没有影响;随着料液相中溶质Cu(Ⅱ)浓度的增大传质通量增大,而反萃相中的Cu(Ⅱ)浓度对传质过程几乎没有影响;传质通量会随着壳程料液流速的增大而增大,但管程侧反萃相的流速对传质过程影响很小;逆流和并流两种操作方式对传质过程的影响可以忽略,而膜丝有效长度的增加会导致单位面积平均传质通量的下降。 相似文献
13.
14.
Recovery of copper ions from wastewater using a hollow fiber supported emulsion liquid membrane (HFSELM) was studied with LIX984N as carrier, kerosene as diluents, and sulfuric acid solution as strippi... 相似文献
15.
16.
In this paper, a new liquid membrane technique, hollow fiber renewal liquid membrane (HFRLM), is presented, which is based on the surface renewal theory, and integrates the advantages of fiber membrane extraction, liquid film permeation and other liquid membrane processes. The results from the system of CuSO4+D2EHPA in kerosene+HCl show that the HFRLM process is very stable. The liquid membrane is renewed constantly during the process, the direct contact of organic droplets and aqueous phase provides large mass transfer area. These effects can significantly reduce the mass transfer resistance in the lumen side. Then the mixture of feed phase and organic phase flowing through the lumen side gives a higher mass transfer rate than that of stripping phase and organic phase, because the aqueous layer diffusion of feed phase is the rate-controlling step. The overall mass transfer coefficient increases with increasing flow rates and D2EHPA concentration in the organic phase, and with decreasing initial copper concentration in the feed phase. The overall mass transfer coefficient also increases with increasing pH in the feed phase, and reaches a maximum value at pH of 4.44, then decreases. Also, there is a favorable w/o volume ratio of 20:1 to 30:1 for this process. Compared with hollow fiber supported liquid membrane and hollow fiber membrane extraction processes, HFRLM process has a high mass transfer rate. Mathematical model for the HFRLM process based on the surface renewal theory is developed. The calculated results are in good agreement with experimental results under the conditions studied. 相似文献
17.
18.
中空纤维膜吸收烟气中CO2是一种清洁、高效、最具潜力的脱碳技术方法之一。本文建立了一个二维的中空纤维膜接触器平行逆流吸收混合气中CO2的非润湿模型。考虑轴向和径向扩散,模拟了EEA、EDA和PZ 3种吸收剂在不同操作条件下对CO2的脱除效果和传质性能。结果表明:脱碳性能从大到小为PZ>EDA>EEA;气相参数对脱碳和传质的影响比液相参数更显著;提高气体流速、CO2浓度和气温,脱碳率均会下降;提高液速、吸收剂浓度和液温,脱碳率均增大,而传质速率只有在提高气温时会下降,其他参数的升高均会使其增大;应采用适当的液相参数,防止操作参数过高带来的不利影响。 相似文献
19.
影响渗透汽化中空纤维复合膜分离性能的制备工艺研究 总被引:1,自引:2,他引:1
采用聚乙烯醇(PVA)为分离层的模材料,以浸涂工艺把PVA复合到聚砜(PS)或聚丙烯腈(PAN)的中空纤维支撑层上,在长度为0.4m的不锈钢管中组装若干根中空纤维复合膜测定对乙醇水溶液的渗透汽化(PV)分离性能。结果表明,PVA/PAN中空纤维复合膜的性能优于PVA/PS,内径较大(1.3mm)的优于内径上(0.4mm)者,PVA水溶液在中空纤维支撑层上的涂复次数对复合膜PV分离性能、以及PVA/ 相似文献