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A trimethylamine–carbon dioxide draw solution for osmotic engines

Journal Article · · AIChE Journal
DOI:https://doi.org/10.1002/aic.16175· OSTI ID:1433768
 [1];  [1];  [1];  [1];  [2];  [3];  [1]
  1. Dept. of Chemical and Biomolecular Engineering University of Connecticut, 191 Auditorium Rd. Unit 3222 Storrs CT 06269
  2. Forward Water Technologies, 945 Princess Street Kingston ON K7L 0E9
  3. Idaho National Laboratory, P.O. Box 1625 Idaho Falls ID 83415

This study evaluates the pressure retarded osmosis performance of TMA–CO 2 for potential use in osmotic heat engines. Power densities up to 18.6 W m −2 were achievable at relatively low pressure (10 bar) using 5 M TMA–CO 2 draw solutions. Compared to NaCl control tests, the TMA–CO 2 exhibited 20% lower water flux due in large part to its larger molecular size and associated higher solution viscosity and lower diffusion coefficient. Compared to the ammonia‐carbon dioxide draw solution, water flux was comparable but reverse solute flux of TMA–CO 2 was nearly one order of magnitude lower. Larger solute size was found to create a performance tradeoff as reduced reverse solute flux improved water flux while higher viscosity and lower diffusion coefficient worsened water flux. © 2018 American Institute of Chemical Engineers AIChE J , 64: 3369–3375, 2018

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
1433768
Journal Information:
AIChE Journal, Journal Name: AIChE Journal Journal Issue: 9 Vol. 64; ISSN 0001-1541
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United States
Language:
English

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