Energy requirement of HI separation from HI–I2–H2O mixture using electro-electrodialysis and distillation

Guo, Hanfei; Kasahara, Seiji; Tanaka, Nobuyuki; Onuki, Kaoru

doi:10.1016/j.ijhydene.2012.07.078

Cited by 16 publications

(8 citation statements)

References 20 publications

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“…This model can be used to simulate the pre‐concentration process of HI acid with EED. The details of the EED model were reported in our previous study . HI x distillation column models …”

Section: Design Of Is‐100 Loopmentioning

confidence: 99%

Design of integrated laboratory-scale iodine sulfur hydrogen production cycle at INET

Zhang

Zhou

Guo

et al. 2016

Int. J. Energy Res.

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SUMMARYThe iodine sulfur (IS) thermochemical water-splitting process, which has various merits, is considered as one of the most promising nuclear hydrogen production methods and has been intensively studied by many institutions. At the Institute of Nuclear and New Energy Technology of Tsinghua University in China, a proof-of-concept closed IS facility was built, and a closed-cycle experiment was conducted. Currently, as a prospective research item of the high-temperature gas-cooled reactor demonstration plant project, an integrated laboratory-scale IS facility (IS-100) that aims to achieve long-term stable operation of IS cycle is being developed, and the design and optimization of the flowsheet for the IS cycle are conducted. The specifications of the facility are presented along with simulation models. Mass balance and compositions of the streams in the Bunsen, sulfuric acid, and HI sections are calculated using Aspen Plus software with OLI database and embedded self-made models. Based on the comparison between mass of recycled streams and heat requirements as well as sensitivity analysis, the optimized flowsheet and the operational parameters are proposed. In addition, the preliminary closed cycle experiment results on IS-100 were presented, and the efficiency of the IS process and the R&D efforts to improve its efficiency are discussed.

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“…This model can be used to simulate the pre‐concentration process of HI acid with EED. The details of the EED model were reported in our previous study . HI x distillation column models …”

Section: Design Of Is‐100 Loopmentioning

confidence: 99%

Design of integrated laboratory-scale iodine sulfur hydrogen production cycle at INET

Zhang

Zhou

Guo

et al. 2016

Int. J. Energy Res.

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“…With this aim, an experimental campaign was carried out to obtain sensible data about this process, in order to show advantages and limitations of this technique, and to provide values for the EED process parameters, that is to say, the proton transport numbers and the osmosis coefficients, calculated at several voltages and temperatures. In particular, with respect to present literature, new types of electrodes were employed, which provide a similar efficiency of the ones previously proposed, made of glassy carbon [7][8][9][10][11][12], but do not present the problems related to iodine contamination [15].…”

Section: Introductionmentioning

confidence: 86%

“…ED-64-002 (PCA Polymerchemie Altmeier Gmbh, Germany), whose original electrodes were replaced with home-made rhodium coated titanium electrodes. Regarding the electrode materials, the scientific literature shows that glassy carbon is catalytically active for the oxidation-reduction of the I 2 /I − pair [7][8][9][10][11][12], and therefore more efficient than platinum, as reported in Figure 2.…”

Section: Development Of the Electrodes And Of The Experimental Setup mentioning

confidence: 99%

“…Alternatively, a reactive distillation configuration under pressurized conditions was also investigated [4][5][6]. More recently, the use of electro-electrodialysis [7][8][9][10][11][12], pervaporation processes with cation exchange membranes [13,14] and membrane distillation [15] was proposed to concentrate HI aqueous solutions. In all cases, iodine and water excess are removed from the main stream and recycled to the Bunsen reactor.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study for HIx Concentration by Electro-Electrodialysis (EED) Cells in the Water Splitting Sulfur-Iodine Thermochemical Cycle

et al. 2019

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The efficiency of HI concentration/separation from a HIx solution, (mixture of HI/H2O/I2) represents a crucial factor in the sulfur-iodine thermochemical water splitting process for hydrogen production. In this paper, an experimental study on HI cathodic concentration in HIx solution using stacked electro-electrodialysis (EED) cells was carried out under the conditions of 1 atm and at three different temperature (25, 55 and 85 °C) and using a current density of 0.10 A/cm2. Results showed that an increase in HI concentration can be obtained under certain conditions. The apparent transport number (t+) in all the experiments was very close to 1, and the electro-osmosis coefficient (β) changed in a range of 1.08–1.16. The tests showed a detectable, though slow, increase in both the anodic iodine and cathodic hydriodic acid concentrations.

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“…If the water permeation flux can be maintained and, thus enhancing the membrane selectivity. [4] sulfuric acid [9] iodic acid [10]- [11] nitric acid [12]- [13] acetic acid [14] glycerine [15] Isopropanol [15]- [17] Methanol [17] iodic acid/iodine [18] Organic/organic separation methanol/triglyme [19] This work reports the use of a hygroscopic inorganic oxide filler, silica, added to the polymer matrices to give modified Nafion ® membranes. Nanocomposite membranes were prepared by casting Nafion ® solution in dimethylformamide (DMF) with colloidal silica.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Simulation of Concentration of Hydrogen Peroxide by Pervaporation Using Nafion®-Silica Nanocomposite Membranes

Hieu¹

2017

IJMSE

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Nafion ® -silica nanocomposite membranes were used to concentrate hydrogen peroxide by pervaporation to aid the development of improved membranes. Membranes were fabricated by casting Nafion ® solution in dimethylformamide with colloidal silica. Their morphologies and thermomechanical properties were characterized with respect to silica content (5-20 wt%) by transmission electron microscopy, scanning electron microscopy, and dynamic mechanical analysis. Pervaporation was carried out using a feed solution of 70 wt% hydrogen peroxide at 30 °C and a permeate pressure of 0.5 Torr; the membranes were assessed with respect to permeate flux and selectivity. Permeate flux decreased slightly from 6.189 to 5.750 mol/(h•m 2 ) with increasing silica content; selectivity was increased by 60% compared with recast Nafion ® without silica. Parameters for batch-type pervaporation process design, such as the retentate hydrogen peroxide concentration and the yield, were calculated using a mathematical model developed based on a solution-diffusion mechanism. The simulation results demonstrated that the modified Nafion ® membranes should require smaller areas and improve pervaporation.

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Energy requirement of HI separation from HI–I2–H2O mixture using electro-electrodialysis and distillation

Cited by 16 publications

References 20 publications

Design of integrated laboratory-scale iodine sulfur hydrogen production cycle at INET

Design of integrated laboratory-scale iodine sulfur hydrogen production cycle at INET

Experimental Study for HIx Concentration by Electro-Electrodialysis (EED) Cells in the Water Splitting Sulfur-Iodine Thermochemical Cycle

Experimental Study and Simulation of Concentration of Hydrogen Peroxide by Pervaporation Using Nafion®-Silica Nanocomposite Membranes

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