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Title: Investigation of Sorption and Diffusion Mechanisms, and Preliminary Economic Analysis

Abstract

This report describes the synthesis and evaluation of molecular sieve zeolite membranes to separate and concentrate tritiated water (HTO) from dilute HTO-bearing aqueous streams. Several monovalent and divalent cation exchanged silico alumino phosphate (SAPO-34) molecular sieve zeolite membranes were synthesized on disk supports and characterized with gas and vapor permeation measurements. The pervaporation process performance was evaluated for the separation and concentration of tritiated water. Experiments were performed using tritiated water feed solution containing tritium at the high end of the range (1 mCi/mL) anticipated in a nuclear fuel processing system that includes both acid and water streams recycling. The tritium concentration was about 0.1 ppm. The permeate was recovered under vacuum. The HTO/H2O selectivity and separation factor calculated from the measured tritium concentrations ranged from 0.99 to 1.23, and 0.83-0.98, respectively. Although the membrane performance for HTO separation was lower than expected, several encouraging observations including molecular sieving and high vapor permeance are reported. Additionally, several new approaches are proposed, such as tuning the sorption and diffusion properties offered by small pore LTA zeolite materials, and cation exchanged aluminosilicates with high metal loading. It is hypothesized that substantially improved preferential transport of tritium (HTO) resulting in a more concentratedmore » permeate can be achieved. Preliminary economic analysis for the membrane-based process to concentrate tritiated water is also discussed.« less

Authors:
 [1];  [1];  [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Georgia Inst. of Technology, Atlanta, GA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1343542
Report Number(s):
ORNL/TM-2017/59
AF5805010; NEAF327
DOE Contract Number:
AC05-00OR22725
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; tritiated water; membrane separation; sorption and diffusion; zeolite

Citation Formats

Bhave, Ramesh R., Jubin, Robert Thomas, Spencer, Barry B., and Nair, Sankar. Investigation of Sorption and Diffusion Mechanisms, and Preliminary Economic Analysis. United States: N. p., 2017. Web. doi:10.2172/1343542.
Bhave, Ramesh R., Jubin, Robert Thomas, Spencer, Barry B., & Nair, Sankar. Investigation of Sorption and Diffusion Mechanisms, and Preliminary Economic Analysis. United States. doi:10.2172/1343542.
Bhave, Ramesh R., Jubin, Robert Thomas, Spencer, Barry B., and Nair, Sankar. Wed . "Investigation of Sorption and Diffusion Mechanisms, and Preliminary Economic Analysis". United States. doi:10.2172/1343542. https://www.osti.gov/servlets/purl/1343542.
@article{osti_1343542,
title = {Investigation of Sorption and Diffusion Mechanisms, and Preliminary Economic Analysis},
author = {Bhave, Ramesh R. and Jubin, Robert Thomas and Spencer, Barry B. and Nair, Sankar},
abstractNote = {This report describes the synthesis and evaluation of molecular sieve zeolite membranes to separate and concentrate tritiated water (HTO) from dilute HTO-bearing aqueous streams. Several monovalent and divalent cation exchanged silico alumino phosphate (SAPO-34) molecular sieve zeolite membranes were synthesized on disk supports and characterized with gas and vapor permeation measurements. The pervaporation process performance was evaluated for the separation and concentration of tritiated water. Experiments were performed using tritiated water feed solution containing tritium at the high end of the range (1 mCi/mL) anticipated in a nuclear fuel processing system that includes both acid and water streams recycling. The tritium concentration was about 0.1 ppm. The permeate was recovered under vacuum. The HTO/H2O selectivity and separation factor calculated from the measured tritium concentrations ranged from 0.99 to 1.23, and 0.83-0.98, respectively. Although the membrane performance for HTO separation was lower than expected, several encouraging observations including molecular sieving and high vapor permeance are reported. Additionally, several new approaches are proposed, such as tuning the sorption and diffusion properties offered by small pore LTA zeolite materials, and cation exchanged aluminosilicates with high metal loading. It is hypothesized that substantially improved preferential transport of tritium (HTO) resulting in a more concentrated permeate can be achieved. Preliminary economic analysis for the membrane-based process to concentrate tritiated water is also discussed.},
doi = {10.2172/1343542},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}

Technical Report:

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