Hydrate-based desalination process enhanced via graphite

2019 5th International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Li, Feng^1 ; Yang, Yamei^1 ; Shi, Changrui^1 ; Yang, Shiying^1 ; Chen, Zechang^1 ; Yang, Shihao^1 ; Ling, Zheng^1 ; Song, Yongchen^1

Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian

116024, China^1

关键词: Conversion rates;    Drinking water standards;    Graphite particles;    High quality;    Hydrate formation;    Large amounts;    NaCl solution;    Process-based;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/295/4/042028/pdf
DOI  :  10.1088/1755-1315/295/4/042028

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Desalination via hydrate processes is a novel and attractive method for desalting seawater. However, it is a great challenge to form hydrates with large amount in a short time, especially in the presence of high concentrations of salts. In this study, we used cheap and easily separated graphite particles to promote hydrate-based desalination. It was confirmed that graphite has no impact on the structures and compositions of cyclopentane hydrates. The dosage of used graphite can dramatically increase the conversion rate of water to hydrate, without degradation of the desalination efficiency. Due to the presence of graphite, the ratio of NaCl solution to cyclopentane has little impact on the conversion rate. A multi-stage desalination via hydrate formation was demonstrated, which can produce high quality freshwater with a purity of 99.76% meeting the drinking water standard. The findings in this study will help to rationally select and design the desalination process based on hydrates.