| 高浓度Na+//NO3-， SO42——H2O溶液的膜蒸馏结晶耦合过程调控 |
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| 引用本文： | 孙国鑫,苟萌萱,周诚,常佩,贺高红,姜晓滨. 高浓度Na+//NO3-， SO42——H2O溶液的膜蒸馏结晶耦合过程调控[J]. 化工学报, 2022, 73(7): 3078-3089. DOI: 10.11949/0438-1157.20220177 |
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| 作者姓名： | 孙国鑫 苟萌萱 周诚 常佩 贺高红 姜晓滨 |
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| 作者单位： | 1.大连理工大学化工学院，精细化工国家重点实验室，辽宁省石化行业高效节能分离技术工程实验室，辽宁 大连 116024;2.西安近代化学研究所，陕西 西安 710065 |
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| 基金项目： | 国家自然科学基金项目(21978037);国家重点研发计划项目(2021YFC2901300) |
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| 摘 要： | 煤化工、含能材料等工业领域产生的富含硝酸盐、硫酸盐的高浓废水排放量巨大、环境危害严重。高浓度复合盐水低能耗处理的同时实现高品质结晶过程调控，已经成为一个重要的研究方向。针对典型的高浓度Na+//NO， SO-H2O溶液体系，提出利用膜蒸馏结晶耦合技术处理，通过微孔膜界面调控目标盐分的成核能垒，有效控制了典型蒸发结晶过程中多元盐离子扩散差异、爆发成核，避免了形成空心、高杂质离子包藏的晶体，提升了结晶纯度和分离效率；同时，提出在膜蒸馏的优势分离区间内蒸发溶剂，然后再通过减压蒸发结晶的优化设计思路，降低了膜表面结垢和膜孔润湿风险，进一步提升了整个过程能量效率，提高了膜可重复利用率。研究为开发高浓度复合无机盐水处理技术提供了新思路。
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| 关 键 词： | 膜蒸馏 减压蒸发 结晶 过程耦合 盐水处理 |
| 收稿时间： | 2022-02-10 |
Membrane distillation crystallization coupling process for the treatment of high concentration Na+//NO3-, SO42--H2O solution |
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| Guoxin SUN,Mengxuan GOU,Cheng ZHOU,Pei CHANG,Gaohong HE,Xiaobin JIANG. Membrane distillation crystallization coupling process for the treatment of high concentration Na+//NO3-, SO42--H2O solution[J]. Journal of Chemical Industry and Engineering(China), 2022, 73(7): 3078-3089. DOI: 10.11949/0438-1157.20220177 |
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| Authors: | Guoxin SUN Mengxuan GOU Cheng ZHOU Pei CHANG Gaohong HE Xiaobin JIANG |
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| Affiliation: | 1.State Key Laboratory of Fine Chemicals, Engineering Laboratory for Petrochemical Energy-efficient Separation Technology of Liaoning Province, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;2.Xi’an Modern Chemistry Research Institute, Xi’an 710065, Shaanxi, China |
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| Abstract: | The high-concentration wastewater rich in nitrates and sulfates produced in industrial fields such as coal chemical industry and energetic materials has a huge amount of discharge and serious environmental damage. It is an important research direction to realize the regulation of high-quality crystallization process while treating high-concentration composite brine with low energy consumption. Aiming at the typical high-concentration Na+//NO, SO-H2O solution system, this paper proposes a membrane distillation and crystallization coupling method to treat this kind of high-concentration composite inorganic brine. The nucleation energy barrier of the target salt is effectively regulated at the microporous membrane interface, which effectively controls the diffusion difference and explosive nucleation of multi-salt ions in the typical evaporative crystallization process. In addition, the formation of hollow and high-impurity ion crystals can be avoided, and the crystal purity and separation performance is improved. The design strategy of evaporating for concentrating the solvent in the advantageous range of membrane distillation, and then evaporating for crystallization under vacuum vaporization, is proposed to reduce the risk of membrane surface scaling and membrane pore wetting. In addition, this strategy further improves the energy efficiency of the entire separation process. The above research provides a new idea for the technology development of high-concentration inorganic brine treatment. |
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| Keywords: | membrane distillation vacuum evaporation crystallization process coupling brine treatment |
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