Chlorine-free emission disposal of spent acid etchant in a three-compartment ceramic membrane reactor

doi:10.1016/j.cjche.2019.04.026

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (1): 271-278.DOI: 10.1016/j.cjche.2019.04.026

• Energy, Resources and Environmental Technology • 上一篇下一篇

Chlorine-free emission disposal of spent acid etchant in a three-compartment ceramic membrane reactor

Fanglu Yuan, Lele Cui, Peipei Ding, Wenheng Jing

State Key Laboratory of Materials-Oriented Chemical Engineering, National Engineering Research Center for Special Separation Membrane, College of Chemical Engineering, Nanjing Tech University, Nanjing 211800, China

收稿日期:2019-02-20 修回日期:2019-04-26 出版日期:2020-01-28 发布日期:2020-03-31
通讯作者: Wenheng Jing
基金资助:
Supported by the National Natural Science Foundation of China (21838005, 21676139), the Higher Education Natural Science Foundation of Jiangsu Province (15KJA530001), the Key Scientific Research and Development Projects of Jiangsu Province (BE201800901) and Research Fund of State Key Laboratory of MaterialsOriented Chemical Engineering (ZK201604).

Chlorine-free emission disposal of spent acid etchant in a three-compartment ceramic membrane reactor

Fanglu Yuan, Lele Cui, Peipei Ding, Wenheng Jing

State Key Laboratory of Materials-Oriented Chemical Engineering, National Engineering Research Center for Special Separation Membrane, College of Chemical Engineering, Nanjing Tech University, Nanjing 211800, China

Received:2019-02-20 Revised:2019-04-26 Online:2020-01-28 Published:2020-03-31
Contact: Wenheng Jing
Supported by:
Supported by the National Natural Science Foundation of China (21838005, 21676139), the Higher Education Natural Science Foundation of Jiangsu Province (15KJA530001), the Key Scientific Research and Development Projects of Jiangsu Province (BE201800901) and Research Fund of State Key Laboratory of MaterialsOriented Chemical Engineering (ZK201604).

摘要/Abstract

摘要： Electrochemical technologies for the on-site treatment of spent acid etchant have received great attention due their ease of operation and economic benefits. On the other hand, a large amount of Cl₂ is generated during the electrolysis process, which leads to potential environmental risks. In the present work, a novel threecompartment ceramic membrane flow reactor, including a cathode chamber, an anode chamber, and a gas absorption chamber was developed. The three chambers were divided by an Al₂O₃ ceramic membrane and a breathable hydrophobic anode diffusion electrode (ADE). The Cl₂ evolution onset potential of the ADE was increased to 1.19 V from 1.05 V of the graphite felt, effectively inhibiting the chlorine evolution reaction (CER). The anode-generated Cl₂ diffused into the gas absorption chamber through the ADE and was eventually consumed by the H₂O₂ adsorbent. Cu could be recovered without emitting chlorine due to the special structure of reactor. The current efficiency of copper precipitation and cathode reduction from Cu²⁺ to Cu⁺ reached 97.7% at a working current of 150 mA. These results indicated that the novel membrane reactor had high potential for application in the copper recovery industry.

关键词: Spent acid etchant, Chlorine evolution reaction, Anode diffusion electrode, Three-compartment reactor, Ceramic membrane

Abstract: Electrochemical technologies for the on-site treatment of spent acid etchant have received great attention due their ease of operation and economic benefits. On the other hand, a large amount of Cl₂ is generated during the electrolysis process, which leads to potential environmental risks. In the present work, a novel threecompartment ceramic membrane flow reactor, including a cathode chamber, an anode chamber, and a gas absorption chamber was developed. The three chambers were divided by an Al₂O₃ ceramic membrane and a breathable hydrophobic anode diffusion electrode (ADE). The Cl₂ evolution onset potential of the ADE was increased to 1.19 V from 1.05 V of the graphite felt, effectively inhibiting the chlorine evolution reaction (CER). The anode-generated Cl₂ diffused into the gas absorption chamber through the ADE and was eventually consumed by the H₂O₂ adsorbent. Cu could be recovered without emitting chlorine due to the special structure of reactor. The current efficiency of copper precipitation and cathode reduction from Cu²⁺ to Cu⁺ reached 97.7% at a working current of 150 mA. These results indicated that the novel membrane reactor had high potential for application in the copper recovery industry.

Key words: Spent acid etchant, Chlorine evolution reaction, Anode diffusion electrode, Three-compartment reactor, Ceramic membrane

Fanglu Yuan, Lele Cui, Peipei Ding, Wenheng Jing. Chlorine-free emission disposal of spent acid etchant in a three-compartment ceramic membrane reactor[J]. 中国化学工程学报, 2020, 28(1): 271-278.

Fanglu Yuan, Lele Cui, Peipei Ding, Wenheng Jing. Chlorine-free emission disposal of spent acid etchant in a three-compartment ceramic membrane reactor[J]. Chinese Journal of Chemical Engineering, 2020, 28(1): 271-278.

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Chlorine-free emission disposal of spent acid etchant in a three-compartment ceramic membrane reactor

Chlorine-free emission disposal of spent acid etchant in a three-compartment ceramic membrane reactor

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