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Title: Increasing Gas Hydrate Formation Temperature for Desalination of High Salinity Produced Water with Secondary Guests

Abstract

We suggest a new gas hydrate-based desalination process using water-immiscible hydrate formers; cyclopentane (CP) and cyclohexane (CH) as secondary hydrate guests to alleviate temperature requirements for hydrate formation. The hydrate formation reactions were carried out in an isobaric condition of 3.1 MPa to find the upper temperature limit of CO2 hydrate formation. Simulated produced water (8.95 wt % salinity) mixed with the hydrate formers shows an increased upper temperature limit from -2 °C for simple CO2 hydrate to 16 and 7 °C for double (CO2 + CP) and (CO2 + CH) hydrates, respectively. The resulting conversion rate to double hydrate turned out to be similar to that with simple CO2 hydrate at the upper temperature limit. Hydrate formation rates (Rf) for the double hydrates with CP and CH are shown to be 22 and 16 times higher, respectively, than that of the simple CO2 hydrate at the upper temperature limit. Such mild hydrate formation temperature and fast formation kinetics indicate increased energy efficiency of the double hydrate system for the desalination process. Dissociated water from the hydrates shows greater than 90% salt removal efficiency for the hydrates with the secondary guests, which is also improved from about 70% salt removalmore » efficiency for the simple hydrates.« less

Authors:
;
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research; National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1127501
Report Number(s):
A-NETL-PUB-007
Journal ID: ISSN 2168-0485
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Sustainable Chemistry & Engineering; Journal Volume: 1; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Desalination; Gas hydrate; Produced water; Brine; Cyclopentane; Cyclohexane

Citation Formats

Cha, Jong-Ho, and Seol, Yongkoo. Increasing Gas Hydrate Formation Temperature for Desalination of High Salinity Produced Water with Secondary Guests. United States: N. p., 2013. Web. doi:10.1021/sc400160u.
Cha, Jong-Ho, & Seol, Yongkoo. Increasing Gas Hydrate Formation Temperature for Desalination of High Salinity Produced Water with Secondary Guests. United States. doi:10.1021/sc400160u.
Cha, Jong-Ho, and Seol, Yongkoo. 2013. "Increasing Gas Hydrate Formation Temperature for Desalination of High Salinity Produced Water with Secondary Guests". United States. doi:10.1021/sc400160u.
@article{osti_1127501,
title = {Increasing Gas Hydrate Formation Temperature for Desalination of High Salinity Produced Water with Secondary Guests},
author = {Cha, Jong-Ho and Seol, Yongkoo},
abstractNote = {We suggest a new gas hydrate-based desalination process using water-immiscible hydrate formers; cyclopentane (CP) and cyclohexane (CH) as secondary hydrate guests to alleviate temperature requirements for hydrate formation. The hydrate formation reactions were carried out in an isobaric condition of 3.1 MPa to find the upper temperature limit of CO2 hydrate formation. Simulated produced water (8.95 wt % salinity) mixed with the hydrate formers shows an increased upper temperature limit from -2 °C for simple CO2 hydrate to 16 and 7 °C for double (CO2 + CP) and (CO2 + CH) hydrates, respectively. The resulting conversion rate to double hydrate turned out to be similar to that with simple CO2 hydrate at the upper temperature limit. Hydrate formation rates (Rf) for the double hydrates with CP and CH are shown to be 22 and 16 times higher, respectively, than that of the simple CO2 hydrate at the upper temperature limit. Such mild hydrate formation temperature and fast formation kinetics indicate increased energy efficiency of the double hydrate system for the desalination process. Dissociated water from the hydrates shows greater than 90% salt removal efficiency for the hydrates with the secondary guests, which is also improved from about 70% salt removal efficiency for the simple hydrates.},
doi = {10.1021/sc400160u},
journal = {ACS Sustainable Chemistry & Engineering},
number = 10,
volume = 1,
place = {United States},
year = 2013,
month =
}