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Treatment of Highly Saline Brines by Supercritical Precipitation Followed by Supercritical Membrane Separation

Journal Article · · Industrial and Engineering Chemistry Research
 [1];  [2]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); University of Illinois at Urbana-Champaign
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
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A two-stage supercritical (SC) desalination system is proposed to treat highly saline brines to high-purity steam that could be used in power generation. Highly saline brines with up to similar to 20% salt content are pressurized and heated to SC conditions of 500 degrees C and 3500 psi to rapidly precipitate the dissolved salts and generate SC steam containing similar to 100 ppm salts. Two highly saline brines, collected from an oil field and a deep saline formation, and two concentrated NaCl solutions were treated in the SC desalination system. A SC membrane separation system with carbon filters is developed and used to purify the SC steam to a high purity level. Promising carbon filters or membranes prepared and tested for purifying SC steam included a porous graphite disk, a flexible graphite sheet, and a carbon nanotube-based membrane. Finally, the best performing membranes exhibited a very high water flux of similar to 200-800 kg/m2.h, with a salt rejection of >90%.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FG02-07ER46471; FE0024015; FG02-07ER46453
OSTI ID:
1607422
Journal Information:
Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 8 Vol. 58; ISSN 0888-5885
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (10)

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Corrosion in high-temperature and supercritical water and aqueous solutions: a review journal April 2004
Robust carbon nanotube membranes directly grown on Hastelloy substrates and their potential application for membrane distillation journal September 2016
Treatment of a hypersaline brine, extracted from a potential CO2 sequestration site, and an industrial wastewater by membrane distillation and forward osmosis journal October 2017
Assessment of desalination technologies for treatment of a highly saline brine from a potential CO2 storage site journal February 2017
Design and results of a first generation pilot plant for supercritical water desalination (SCWD) journal August 2018
Sustainable management of hypersaline brine waste: Zero liquid discharge via Joule-heating at supercritical condition journal October 2018
Flow characteristics of aqueous salt solutions for applications in supercritical water oxidation journal September 2007
Design of a Process for Supercritical Water Desalination with Zero Liquid Discharge journal May 2015

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY