Comparing hydrate-based method with freezing/thawing method for chromium hydroxide sulfate removal close to the melting point of ice

Wu, Jingchun; Kang, Mengqi; Hu, Fenglong; Yan, Yu-Hao; Liu, Chenzhe; Liang, Zhikai; Zeng, Yaosong; Jiang, Jian‐Hong; Deng, Bin

doi:10.1016/j.seppur.2021.118523

Cited by 11 publications

(11 citation statements)

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“…In addition, methane hydrate equilibrium conditions in bulk water were close to methane hydrate equilibrium conditions in a basic chromium sulfate solution. So, if the concentration of basic chromium sulfate decreased to less than 1.0 wt %, methane hydrate equilibrium conditions in basic chromium sulfate solutions can be seen as methane hydrate equilibrium conditions in bulk water …”

Section: Resultsmentioning

confidence: 99%

“…After methane hydrate equilibrium conditions in basic chromium sulfate solution and nickel sulfate hexahydrate solution are obtained as in section and section , the basic chromium sulfate removal efficiency and nickel sulfate hexahydrate removal efficiency by the hydrate-based method was conducted in these sections. The repeatability of the hydrate-based method for heavy metal ion removal has been checked in our previous publication . The experimental temperature and initial pressures were 274.2 K and 6.5 MPa, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Heavy metal removal efficiency is calculated as the following equation: where R is the heavy removal efficiency. W 0 is the initial heavy metal mass in solution, and W 1 is the heavy metal mass in the dissociated hydrate.…”

Section: Discussionmentioning

confidence: 99%

“…W 0 is the initial heavy metal mass in solution, and W 1 is the heavy metal mass in the dissociated hydrate. The yield of dissociated water is calculated as follows where V w is the volume of dissociated water obtained from methane hydrate, and V t is the total volume of the initial solution.…”

Section: Discussionmentioning

confidence: 99%

“…Song’s group has studied heavy metal removal by using R141b (CH 3 –CCl 2 F) and effluent to form structure-II hydrate. , The nontoxicity, thermodynamic stability, and immiscibility of R141b were considered the reasons for choosing R141b and an effluent. Wu et al have investigated chromium hydroxide sulfate removal by forming methane hydrate close to the melting point of ice . They considered that there were no additional processes after methane hydrate dissociation by using methane as a guest molecule to form hydrate.…”

Section: Introductionmentioning

confidence: 99%

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Hydrate-Based Method to Remove Cr(III) and Ni(II) in Chromium Hydroxide Sulfate and Nickel Sulfate Hexahydrate Solutions

Yang

Kang

et al. 2021

J. Chem. Eng. Data

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The hydrate-based method provides a potential method to remove heavy metal ions. In this work, the phase equilibrium conditions of methane hydrate in chromium hydroxide sulfate solutions and nickel sulfate hexahydrate solutions were first measured. The results suggested that the addition of both chromium hydroxide sulfate and nickel sulfate hexahydrate inhibited methane hydrate formation and acted as thermodynamic inhibitors. In addition, the removal efficiencies of both chromium hydroxide sulfate and nickel sulfate hexahydrate were also measured by forming methane hydrate at different hydration time. The results suggested that the chromium hydroxide sulfate removal efficiency reached 82.1% with a 23.7% yield of melting water at 274.2 K with a hydration time of 1 h, while nickel sulfate hexahydrate removal efficiency reached 67.5% with 68% yield of melting water at 274.2 K.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%