Experimental study of two phase separation in the Bunsen section of the sulfur–iodine thermochemical cycle

Giaconia, Alberto; Caputo, Giampaolo; Ceroli, A.; Diamanti, Maurizio; Barbarossa, Vincenzo; Tarquini, P.; Sau, Salvatore

doi:10.1016/j.ijhydene.2006.08.015

Cited by 88 publications

(38 citation statements)

References 13 publications

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“…It was found that 353.5K temperature point with iodine mole excess of 4, results in lowest fraction of water moving to HIx phase i.e. 48% and making azeotropic ratio of 0.2 which is in agreement with the results by Giaconia et al (2007) and Parisi et al (2011). Hence it confirms 353.5K and iodine excess of 4 and water excess of 10.8 to be best single operating point for acceptable over-azeotropic composition and low contamination.…”

Section: Best Operating Conditions and Comparison With Operating Rangsupporting

confidence: 81%

“…Present study has come up with very precise operating range and optimal point of operation. Recent experimental study on azeotropic composition Zhu et al (2012Zhu et al ( , 2013 , SO2 absorption study Giaconia et al (2007) and reverse Bunsen reaction study [19] were guideline for precise operating conditions. Norman et al (1981) had chosen melting point of iodine as operating temperature at 393K and then soon the temperature was lowered to 293-373 ; however excess water was used in their operating conditions.…”

Section: Best Operating Conditions and Comparison With Operating Rangmentioning

confidence: 99%

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Effects of Excess Iodine and Water on Bunsen Reaction for Over-Azeotropic Limit

Satpute¹,

Park

Revankar

2015

ACER

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Phase separation is of major importance in a Bunsen reaction in sulfur-iodine thermochemical cycle for hydrogen generation. Extensive experimental data on Bunsen reaction was collected and assembled over range of reaction temperature 293 -393.5 K, excess iodine in the range of 1-16 moles, and excess water in the range of 1-22 moles. The data was systematically analyzed to see key parametric effects on the reaction. The effects of iodine, water and temperature were studied on density ratio, distribution of components in two phases, reverse Bunsen reaction, SO2 dissolution, and azeotrope limits. Best operating conditions were obtained to for which Bunsen reaction would be economical. The analysis indicated that iodine excess of 4 to 6 moles, water excess of 10.5 to 12.5 moles, and temperature range of 345-360 K are the best operating range for the Bunsen reaction. These operating ranges ensure no side reaction, economical operation by avoiding excess iodine, water and complicated options to break or bypass azeotrope. In addition reverse Bunsen and SO2 solubility study are also considered for better understanding of process. Based on this study unique points of operation are recommended.

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Section: Best Operating Conditions and Comparison With Operating Rangsupporting

confidence: 81%

Section: Best Operating Conditions and Comparison With Operating Rangmentioning

confidence: 99%

Effects of Excess Iodine and Water on Bunsen Reaction for Over-Azeotropic Limit

Satpute¹,

Park

Revankar

2015

ACER

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“…Unfortunately, there in not enough information to date on these alternative methods for practical applications. Giaconia et al, (2007) studied the phase separation process in the Bunsen process. The authors performed experiments in 50 mL jacketed quartz vessel at temperatures of 80, 95 and 120°C.…”

Section: Bunsen Reaction Kinetics and Stoichiometrymentioning

confidence: 99%

Design options for a bunsen reactor.

Moore¹

2013

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“…Non-negligible amounts of sulfur-containing and iodine-containing compounds are dissolved in the HI x phase and H 2 SO 4 phase, respectively (Giaconia et al, 2007). The reverse Bunsen reaction or side reaction between HI and H 2 SO 4 may occur, producing SO 2 , elemental sulfur or H 2 S (Sakurai et al, 2000a;Hwang et al, 2005): …”

Section: Introductionmentioning

confidence: 99%

“…Establishing the closed-cycle operation technology and improving the process thermal efficiency are both highly sensitive to several factors involved in the Bunsen section, such as the composition of the process solution, the excess of iodine and water in the feed, and the side reactions. The study of the Bunsen section has attracted most interest, and the majority of studies have focused on the performance of the liquid-liquid equilibrium phase separation (Sakurai et al, 2000b;Colette et al, 2006;Lee et al, 2006;Giaconia et al, 2007;Lee et al, 2008;Yoon et al, 2009;Colette-Maatouk et al, 2009;Zhu et al, 2012). The iodine content has been found to be the key parameter that affects the separation characteristics: the higher the iodine content, the better is the segregation behavior.…”

Section: Introductionmentioning

confidence: 99%

Occurrence of the Bunsen side reaction in the sulfur-iodine thermochemical cycle for hydrogen production

Zhu

Zhang

Ying

et al. 2013

J. Zhejiang Univ. Sci. A

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Abstract:This study aimed to establish a closed-cycle operation technology with high thermal efficiency in the thermochemical sulfur-iodine cycle for large-scale hydrogen production. A series of experimental studies were performed to investigate the occurrence of side reactions in both the H 2 SO 4 and HI x phases from the H 2 SO 4 /HI/I 2 /H 2 O quaternary system within a constant temperature range of 323-363 K. The effects of iodine content, water content and reaction temperature on the side reactions were evaluated. The results showed that an increase in the reaction temperature promoted the side reactions. However, they were prevented as the iodine or water content increased. The occurrence of side reactions was faster in kinetics and more intense in the H 2 SO 4 phase than in the HI x phase. The sulfur or hydrogen sulfide formation reaction or the reverse Bunsen reaction was validated under certain conditions.

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Experimental study of two phase separation in the Bunsen section of the sulfur–iodine thermochemical cycle

Cited by 88 publications

References 13 publications

Effects of Excess Iodine and Water on Bunsen Reaction for Over-Azeotropic Limit

Effects of Excess Iodine and Water on Bunsen Reaction for Over-Azeotropic Limit

Design options for a bunsen reactor.

Occurrence of the Bunsen side reaction in the sulfur-iodine thermochemical cycle for hydrogen production

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