On the presence of solute-solvent transport coupling in reverse osmosis
The present work demonstrates that experimental salt passage data for reverse osmosis (RO) shows better agreement with models capturing solute-solvent transport coupling (convective coupling), especially as the applied pressure is increased. This conclusion is drawn based on five RO data sets using...
| Κύριοι συγγραφείς: | , |
|---|---|
| Άλλοι συγγραφείς: | |
| Μορφή: | Άρθρο |
| Έκδοση: |
Elsevier BV
2020
|
| Διαθέσιμο Online: | https://hdl.handle.net/1721.1/126411 |
| _version_ | 1826213109600092160 |
|---|---|
| author | Roy, Yagnaseni Lienhard, John H |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Roy, Yagnaseni Lienhard, John H |
| author_sort | Roy, Yagnaseni |
| collection | MIT |
| description | The present work demonstrates that experimental salt passage data for reverse osmosis (RO) shows better agreement with models capturing solute-solvent transport coupling (convective coupling), especially as the applied pressure is increased. This conclusion is drawn based on five RO data sets using cellulose acetate and polyamide membranes that were modeled using the classical solution diffusion (SD) model, which does not include convection, as well as the convection-inclusive SD model introduced by Paul in 2004 and the pore-based model, which also includes convective coupling. The improved model-to-experimental data agreement with solute-solvent coupling is more easily noticed from salt passage variation with pressure than from the most commonly studied RO metric, salt rejection ratio. The importance of solute-solvent coupling in RO indicates that free volume in the membrane influences the description of membrane transport, and that these voids ‘open up’ as applied pressure is increased. The derivation of the pore-based and SD models from the Maxwell-Stefan equations is shown, and major differences in assumptions used in their derivation are discussed. A study of these differences should aid membrane researchers in selecting the most appropriate modeling approach for a given solute-solvent-membrane system. |
| first_indexed | 2024-09-23T15:43:27Z |
| format | Article |
| id | mit-1721.1/126411 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T15:43:27Z |
| publishDate | 2020 |
| publisher | Elsevier BV |
| record_format | dspace |
| spelling | mit-1721.1/1264112022-10-02T03:39:24Z On the presence of solute-solvent transport coupling in reverse osmosis Roy, Yagnaseni Lienhard, John H Massachusetts Institute of Technology. Department of Mechanical Engineering The present work demonstrates that experimental salt passage data for reverse osmosis (RO) shows better agreement with models capturing solute-solvent transport coupling (convective coupling), especially as the applied pressure is increased. This conclusion is drawn based on five RO data sets using cellulose acetate and polyamide membranes that were modeled using the classical solution diffusion (SD) model, which does not include convection, as well as the convection-inclusive SD model introduced by Paul in 2004 and the pore-based model, which also includes convective coupling. The improved model-to-experimental data agreement with solute-solvent coupling is more easily noticed from salt passage variation with pressure than from the most commonly studied RO metric, salt rejection ratio. The importance of solute-solvent coupling in RO indicates that free volume in the membrane influences the description of membrane transport, and that these voids ‘open up’ as applied pressure is increased. The derivation of the pore-based and SD models from the Maxwell-Stefan equations is shown, and major differences in assumptions used in their derivation are discussed. A study of these differences should aid membrane researchers in selecting the most appropriate modeling approach for a given solute-solvent-membrane system. 2020-07-28T15:13:15Z 2020-07-28T15:13:15Z 2020-10 2020-04 Article http://purl.org/eprint/type/JournalArticle 0376-7388 https://hdl.handle.net/1721.1/126411 Roy, Yagnaseni and John H.Lienhard V. "On the presence of solute-solvent transport coupling in reverse osmosis." Forthcoming in Journal of Membrane Science 611 (October 2020): 118272 © 2020 Elsevier B.V. http://dx.doi.org/10.1016/j.memsci.2020.118272 Journal of Membrane Science Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Elsevier BV Prof. Lienhard |
| spellingShingle | Roy, Yagnaseni Lienhard, John H On the presence of solute-solvent transport coupling in reverse osmosis |
| title | On the presence of solute-solvent transport coupling in reverse osmosis |
| title_full | On the presence of solute-solvent transport coupling in reverse osmosis |
| title_fullStr | On the presence of solute-solvent transport coupling in reverse osmosis |
| title_full_unstemmed | On the presence of solute-solvent transport coupling in reverse osmosis |
| title_short | On the presence of solute-solvent transport coupling in reverse osmosis |
| title_sort | on the presence of solute solvent transport coupling in reverse osmosis |
| url | https://hdl.handle.net/1721.1/126411 |
| work_keys_str_mv | AT royyagnaseni onthepresenceofsolutesolventtransportcouplinginreverseosmosis AT lienhardjohnh onthepresenceofsolutesolventtransportcouplinginreverseosmosis |