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http://dx.doi.org/10.9713/kcer.2019.57.3.378

Comparison on the Energy Consumption of the Vacuum Evaporation and Hydrated-Based Technologies for Concentrating Dissolved Ions  

Han, Kunwoo (Research Institute of industrial Science & Technology)
Rhee, Chang Houn (Research Institute of industrial Science & Technology)
Ahn, Chi Kyu (Research Institute of industrial Science & Technology)
Lee, Man Su (Research Institute of industrial Science & Technology)
Publication Information
Korean Chemical Engineering Research / v.57, no.3, 2019 , pp. 378-386 More about this Journal
Abstract
In the present paper we report the calculation results of operation energy consumption for dissolved ions concentration technologies using vacuum evaporation (VE) and hydrate formation. Calculations were conducted assuming the tenfold concentration of saline water (0.35 wt% NaCl solution) of 1 mol/s at room temperature and atmospheric pressure employing vacuum evaporation at $69^{\circ}C$ and 30 kPa and hydrate-based concentration using $CH_4$, $CO_2$ and $SF_6$ as guest molecules. Operation energy consumption of VE-based concentration resulted in 47 kJ/mol, whereas those of hydrate-based concentration were 43, 32, and 28 kJ/mol for $CH_4$, $CO_2$ and $SF_6$ hydrates, respectively. We observe that hydrate-based concentration can a competitive option for dissolved ions recovery from energy consumption standpoint. However, the selection of guest gas is very critical, since it accordingly determines the hydration number, the hydrate formation energy, gas compression energy, etc. The selection of guest gas, separation of concentrated brine and water phases, and the enhancement of hydrate formation rate are the key factors for the commercialization of hydrated-based technology for concentrating dissolved ions.
Keywords
Hydrate (clathrate hydrate); Dissolved ions recovery; Desalination; Evaporation-based concentration; Hydrate-based concentration;
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