Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate
Due to high efficiency and low cost, hydrate-based desalination is investigated as a pretreatment method for seawater desalination. To improve the formation rate of hydrates, the effect of sodium dodecyl sulfate (SDS) on CO<sub>2</sub> hydrate formation from a 3.5 wt.% NaCl solution was...
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2021-04-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/8/2094 |
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| author | Lu Liu Yuanxin Yao Xuebing Zhou Yanan Zhang Deqing Liang |
| author_facet | Lu Liu Yuanxin Yao Xuebing Zhou Yanan Zhang Deqing Liang |
| author_sort | Lu Liu |
| collection | DOAJ |
| description | Due to high efficiency and low cost, hydrate-based desalination is investigated as a pretreatment method for seawater desalination. To improve the formation rate of hydrates, the effect of sodium dodecyl sulfate (SDS) on CO<sub>2</sub> hydrate formation from a 3.5 wt.% NaCl solution was measured at 275 K and 3 MPa. X-ray diffraction (XRD) and cryo-scanning electron microscopy (cryo-SEM) were used to measure the crystal structure and micromorphology of the formed hydrates. The results showed that the induction time of CO<sub>2</sub> hydrate formation reduced from 32 to 2 min when SDS concentration increased from 0.01 to 0.05%, the hydrate conversion rate increased from 12.06 to 23.32%, and the remaining NaCl concentration increased from 3.997 to 4.515 wt.%. However, as the SDS concentration surpassed 0.05 wt.%, the induction time increased accompanied by a decrease in the hydrate conversion rate. XRD showed that the CO<sub>2</sub> hydrate was a structure I hydrate, and SDS had no influence on the hydrate structure. However, cryo-SEM images revealed that SDS promoted the formation of hydrates by increasing the specific surface area of the formed hydrates and folds; rods and clusters could be found on the surface of the CO<sub>2</sub> hydrate. Thus, the best SDS concentration for promoting CO<sub>2</sub> hydrate formation was approximately 0.05 wt.%; desalination was most efficient at this concentration. |
| first_indexed | 2024-03-10T12:28:52Z |
| format | Article |
| id | doaj.art-464780c56c98444f976fa974be0e01ed |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T12:28:52Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-464780c56c98444f976fa974be0e01ed2023-11-21T14:50:08ZengMDPI AGEnergies1996-10732021-04-01148209410.3390/en14082094Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl SulfateLu Liu0Yuanxin Yao1Xuebing Zhou2Yanan Zhang3Deqing Liang4Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaKey Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaKey Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaKey Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaKey Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaDue to high efficiency and low cost, hydrate-based desalination is investigated as a pretreatment method for seawater desalination. To improve the formation rate of hydrates, the effect of sodium dodecyl sulfate (SDS) on CO<sub>2</sub> hydrate formation from a 3.5 wt.% NaCl solution was measured at 275 K and 3 MPa. X-ray diffraction (XRD) and cryo-scanning electron microscopy (cryo-SEM) were used to measure the crystal structure and micromorphology of the formed hydrates. The results showed that the induction time of CO<sub>2</sub> hydrate formation reduced from 32 to 2 min when SDS concentration increased from 0.01 to 0.05%, the hydrate conversion rate increased from 12.06 to 23.32%, and the remaining NaCl concentration increased from 3.997 to 4.515 wt.%. However, as the SDS concentration surpassed 0.05 wt.%, the induction time increased accompanied by a decrease in the hydrate conversion rate. XRD showed that the CO<sub>2</sub> hydrate was a structure I hydrate, and SDS had no influence on the hydrate structure. However, cryo-SEM images revealed that SDS promoted the formation of hydrates by increasing the specific surface area of the formed hydrates and folds; rods and clusters could be found on the surface of the CO<sub>2</sub> hydrate. Thus, the best SDS concentration for promoting CO<sub>2</sub> hydrate formation was approximately 0.05 wt.%; desalination was most efficient at this concentration.https://www.mdpi.com/1996-1073/14/8/2094desalinationhydratesodium dodecyl sulfate |
| spellingShingle | Lu Liu Yuanxin Yao Xuebing Zhou Yanan Zhang Deqing Liang Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate Energies desalination hydrate sodium dodecyl sulfate |
| title | Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate |
| title_full | Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate |
| title_fullStr | Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate |
| title_full_unstemmed | Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate |
| title_short | Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate |
| title_sort | improved formation kinetics of carbon dioxide hydrate in brine induced by sodium dodecyl sulfate |
| topic | desalination hydrate sodium dodecyl sulfate |
| url | https://www.mdpi.com/1996-1073/14/8/2094 |
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