高浓度含盐蔗糖溶液的纳滤分离实验研究
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摘要
为探讨运用纳滤(NF)过程实现高浓度二糖和一、二价无机盐分离的可能性,选用商业纳滤膜NF270对高浓度蔗糖与一、二价盐离子的单组分和混合组分溶液开展了分离实验研究.首先,研究了物料浓度、操作压力等因素对高浓度蔗糖与盐的单组分体系分离效果的影响,明确了NF270膜对不同的单组分溶液的透过和截留性能;其次,探究了NF270纳滤膜对高浓度蔗糖/NaCl和蔗糖/Na_2SO_4混合体系的分离效果.实验结果说明,操作压力的降低和盐浓度的升高均能显著降低混合溶液的溶剂透过通量,且高浓度盐离子的存在会影响蔗糖的截留率,而蔗糖对无机盐截留率影响不明显.在高操作压力下,NF270膜可实现对高浓度蔗糖/NaCl混合体系的高效分离.
In order to explore the possibility of using nanofiltration(NF)membrane to separate the high concentrated sugar and chloride,in this paper,a commercial NF membrane(named as NF270)was employed in the permeation of the high concentrated sucrose and the univalent or the bivalent salt solutions of NaCl and Na2 SO4.Firstly,influences of the parameters including the operating pressure and the solute concentration on the separation performance were investigated to determine basic permeation and the rejection performance of the NF270 membrane for the single solution.For high concentrated sucrose and salt solutions,the results had shown that the flux increased with the increase of operating pressure and decrease of salt concentration.In addition,an increase in the salt concentration generally decreased the rejection for the sucrose,while the sucrose has a slight effect on the rejection for the salts.On a higher operating pressure,an efficient selective separation of chloride and the sucrose could be achieved by a NF270 membrane.
In order to explore the possibility of using nanofiltration(NF)membrane to separate the high concentrated sugar and chloride,in this paper,a commercial NF membrane(named as NF270)was employed in the permeation of the high concentrated sucrose and the univalent or the bivalent salt solutions of NaCl and Na2 SO4.Firstly,influences of the parameters including the operating pressure and the solute concentration on the separation performance were investigated to determine basic permeation and the rejection performance of the NF270 membrane for the single solution.For high concentrated sucrose and salt solutions,the results had shown that the flux increased with the increase of operating pressure and decrease of salt concentration.In addition,an increase in the salt concentration generally decreased the rejection for the sucrose,while the sucrose has a slight effect on the rejection for the salts.On a higher operating pressure,an efficient selective separation of chloride and the sucrose could be achieved by a NF270 membrane.
引文
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[3]Murthy Z,Chaudhari L.Rejection behavior of nickel ions from synthetic wastewater containing Na2SO4,NiSO4,MgCl2and CaCl2salts by nanofiltration and characterization of the membrane[J].Desalination,2009,247:610-622.
[4]Wang X L,Zhang C H,Ouyang P K.The possibility of separating saccharides from a NaCl solution by using nanofiltration in diafiltration mode[J].J Membr Sci,2002,204:271-281.
[5]Mikulá2eka P,Cuhorka J.Desalination and concentration of liquid dyes by nanofiltration[J].Desalin Water Treat,2015,55:2711-2720.
[6]Tu C H,Fang Y Y,Zhu J,et al.Free energies of the ion equilibrium partition of KCl into nanofiltration membranes based on applied electrical potential and rejection[J].Langmuir,2011,27:10274-10281.
[7]Fang Y,Bian L,Bi Q,et al.Evaluation of the pore size distribution of a forward osmosis membrane in three different ways[J].J Membr Sci,2014,454:390-397.
[8]Wang D X,Su M,Yu Z Y,et al.Separation performance of a nanofiltration membrane influenced by species and concentration of ions[J].Desalination,2005,175:219-225.
[9]王晓琳,张澄洪,欧阳平凯.应用纳滤膜分离糖和盐的实验研究[J].膜科学与技术,2001,21(1):44-47.
[10]Tanninen J,MnttriM,Nystr9m M.Effect of salt mixture concentration on fractionation with NF membranes[J].J Membr Sci,2006,283:57-64.
[11]付升,于养信,高光华,等.纳滤膜对电解质溶液分离特性的理论研究(I):单一电解质溶液[J].化学学报,2006,64(22):2241-2246.
[12]陈华新,董声雄.纳滤技术在食品及制药工业中的应用(下)[J].上海化工,2001,(10):23-25.
[13]宫慧慧,高群玉,陈慧音.纳滤膜技术在食品和发酵中的应用[J].食品工业科技,2002,(10):87-89.
[14]冯文亮,王静,贾晓江.纳滤技术生产高纯度低聚果糖的研究[J].乳液科学与技术,2003,3(3):102-105.
[15]王晓琳,张澄洪,赵杰.纳滤膜的分离机理及其在食品和医药行业中的应用[J].膜科学与技术,2000,20(1):29-33.
[16]罗利华,杨刚,刑卫红,等.中性有机混合物溶液纳滤过程的实验考察[J].膜科学与技术,2004,24(4):21-26.
[17]韩永萍,林强,何续文.纳滤对糖溶液中一价盐离子的脱出研究[J].食品科技,2008,(4):95-99.
[18]顾春雷.含糖水溶液的纳滤过程研究[D].南京:南京工业大学,2005.
[19]Luo J Q,Wan Y H.Effect of highly concentrated salt on retention of organic solutes by nanofiltration polymeric membranes[J].J Membr Sci,2011,372:145-153.
[20]Wang D,Su M,Yu Z,et al.Separation performance of a nanofiltration membrane influenced by species and concentration of ions[J].Desalination,2005,175:219-225.