Membrane distillation crystallization coupling process for the treatment of high concentration Na+//NO-3, SO24--H2O solution

被引：0

作者：

Sun G. ^{[1
]}

Gou M. ^{[1
]}

Zhou C. ^{[2
]}

Chang P. ^{[2
]}

He G. ^{[1
]}

Jiang X. ^{[1
]}

机构：

[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, Liaoning, Dalian

[2] Xi’an Modern Chemistry Research Institute, Shaanxi, Xi’an

来源：

Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 07期

关键词：

brine treatment; crystallization; membrane distillation; process coupling; vacuum evaporation;

D O I：

10.11949/0438-1157.20220177

中图分类号：

学科分类号：

摘要：

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-3, SO24--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. © 2022 Chemical Industry Press. All rights reserved.

引用

页码：3078 / 3089

页数：11

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