全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
化工学报  2015 

膜蒸馏-结晶耦合从高浓度KCl-MgCl2-H2O溶液中回收KCl

DOI: 10.11949/j.issn.0438-1157.20141598, PP. 1767-1776

Keywords: 高浓度盐水,直接接触膜蒸馏,脱盐,结晶,粒度分布,水活度

Full-Text   Cite this paper   Add to My Lib

Abstract:

用直接接触膜蒸馏处理高浓度的KCl和MgCl2溶液,考察了盐水浓度(1.0~4.0mol·L-1)、循环流速(0.1~0.5m·s-1)对膜蒸馏性能的影响;结果表明:随着盐水浓度的升高,膜通量下降,这是由于盐溶液的蒸汽压(即溶液中水的活度)下降的缘故;当浓度超过3.0mol·L-1时,MgCl2溶液的膜通量出现负值,这主要归结为MgCl2溶液低的水的活度和高黏度的协同影响;提高循环流速,膜通量增大,尤其对高黏度的盐水(即MgCl2溶液),增大流速对减少温度和浓度极化的影响更加有效。利用膜蒸馏-结晶耦合技术和间歇式操作,从高浓度KCl-MgCl2-H2O溶液中回收纯水和KCl结晶产品,考察了不同冷却方式对溶液过饱和度、KCl晶体形貌、粒度和粒度分布的影响。结果表明,自然冷却有利于形成形貌规整、粒度分布相对集中的结晶产品;在KCl降温过程中,自然冷却过程中的最大过冷度比快速降温过程小,从而有效地控制晶核形成的数量和晶体的生长速率。

References

[1]  Tomaszewska M, Gryta M, Morawski A W. Study on the concentration of acids by membrane distillation [J]. Journal of Membrane Science, 1995, 102: 113-122
[2]  Courel M, Dornier M, Herry J M, Rios G M, Reynes M. Effect of operating conditions on water transport during the concentration of sucrose solutions by osmotic distillation [J]. Journal of Membrane Science, 2000, 170: 281-289
[3]  Lawson K W, Lloyd D R. Membrane distillation [J]. Journal of Membrane Science, 1997, 124: 1-25
[4]  El-Bourawi M S, Ding Z, Ma R, Khayet M. A framework for better understanding membrane distillation separation process [J]. Journal of Membrane Science, 2006,285: 4-29
[5]  Banat F, Jwaied N. Economic evaluation of desalination by small-scale autonomous solar-powered membrane distillation units [J]. Desalination, 2008,220: 566-573
[6]  Alklaibi A M, Lior N. Membrane-distillation desalination: status and potential [J]. Desalination, 2004, 171: 111-131
[7]  Safavi M, Mohammadi T. High-salinity water desalination using VMD [J]. Chemical Engineering Journal, 2009, 149: 191-195
[8]  Alkhudhiri A, Darwish N, Hilal N. Treatment of high salinity solutions: application of air gap membrane distillation [J]. Desalination, 2012, 287: 55-60
[9]  Yun Y B, Ma R Y, Zhang W Z, Fane A G, Li J D. Direct contact membrane distillation mechanism for high concentration NaCl solutions [J]. Desalination, 2006, 188: 251-262
[10]  Manawi Y M, Khraisheh M A M M, Fard A K, Benyahia F, Adham S. A predictive model for the assessment of the temperature polarization effect in direct contact membrane distillation desalination of high salinity feed [J]. Desalination, 2014, 341: 38-49
[11]  Martínez L. Comparison of membrane distillation performance using different feeds [J]. Desalination, 2004, 168: 359-365
[12]  Hickenbottom K L, Cath T Y. Sustainable operation of membrane distillation for enhancement of mineral recovery from hypersaline solutions [J]. Journal of Membrane Science, 2014, 454: 426-435
[13]  Mariah L, Buckley C A, Brouckaert C J, Curcio E, Drioli E, Jaganyi D, Ramjugernath D. Membrane distillation of concentrated brines—role of water activities in the evaluation of driving force [J]. Journal of Membrane Science, 2006, 280: 937-947
[14]  Edwie F, Chung T S. Development of simultaneous membrane distillation-crystallization (SMDC) technology for treatment of saturated brine [J]. Chemical Engineering Science, 2013, 98: 160-172
[15]  Curcio E, Criscuoli A, Drioli E. Membrane crystallizers [J]. Industrial & Engineering Chemistry Research, 2001, 40: 2679-2684
[16]  Tun C M, Fane A G, Matheickal J T, Sheikholeslami R. Membrane distillation crystallization of concentrated salts—flux and crystal formation [J]. Journal of Membrane Science, 2005, 257: 144-155
[17]  Guan G, Wang R, Wicaksana F, Yang X, Fane A G. Analysis of membrane distillation crystallization system for high salinity brine treatment with zero discharge using Aspen flowsheet simulation [J]. Industrial & Engineering Chemistry Research, 2012, 51: 13405-13413
[18]  Wang P, Anderko A, Young R D. A speciation-based model for mixed-solvent electrolyte systems [J]. Fluid Phase Equilibria, 2002, 203: 141-176
[19]  El Guendouzi M, Dinane A, Mounir A. Water activities, osmotic and activity coefficients in aqueous chloride solutions at T 298.15 K by the hygrometric method [J]. Journal of Chemical Thermodynamics, 2001, 33: 1059-1072
[20]  Phattaranawik J, Jiraratananon R, Fane A G. Heat transport and membrane distillation coefficients in direct contact membrane distillation [J]. Journal of Membrane Science, 2003, 212: 177-193
[21]  Guan Yunshan (关云山), Cheng Fangqin (程芳琴), Wang Xuming (王旭明), Cheng Huaigang (成怀刚). Comparison of vacuum membrane distillation of three electolyte solution [J], Modern Chemical Industry(现代化工), 2013, 33 (5): 82-87
[22]  Kurdian A R, Bahreini M, Montazeri G H, Sadeghi S. Modeling of direct contact membrane distillation process: flux prediction of sodium sulfate and sodium chloride solutions [J]. Desalination, 2013, 323: 75-82

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133