Soda Ash Production with Low Energy Consumption Using Proton Cycled Membrane Electrolysis
Soda Ash Production with Low Energy Consumption Using Proton Cycled Membrane Electrolysis
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DOI：
10.1021/acs.iecr.8b05371
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发表时间：
2019-01
影响因子：
4.2
通讯作者：
Yifan Wu;Heping Xie;Tao Liu;Yufei Wang;Fuhuan Wang;Xiaolin Gao;Bin Liang
中科院分区：
文献类型：
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作者：
Yifan Wu;Heping Xie;Tao Liu;Yufei Wang;Fuhuan Wang;Xiaolin Gao;Bin Liang
纯碱是重要的化工产品之一，主要采用苏威法生产。然而，Solvay工艺以高达9.7- 13.6GJ/吨Na 2CO 3的速率消耗能量。本文提出了一种质子循环膜电解法生产纯碱的节能方法。在电解过程中，阳极和阴极分别形成H+和OH-后，含H+的溶液与CaCO 3反应得到纯CO 2，纯CO 2被含OH-的阴极电解液吸收生成纯度为99.2%的纯碱。实验发现，在10 mA/cm ~ 2电流密度下，PCME所需电压为0.538-0.765 V，平均电流效率达93.7%。因此，纯碱生产能耗可降低到5.32 GJ/吨纯碱，与索尔维工艺相比降低约60.9%。
Soda ash, as one of the most important chemicals, is mainly manufactured by the Solvay process. However, the Solvay process consumes energy at a rate of up to 9.7–13.6 GJ/ton Na2CO3. Here, we present an energy-saving method to produce soda ash in a proton cycled membrane electrolysis (PCME) process. After forming H+ and OH– at the anode and cathode in electrolysis process, respectively. The H+-containing solution is used to react with CaCO3 to obtain pure CO2, which is absorbed by the OH–-containing catholyte to generate soda ash with a purity of 99.2%. Our experiments found that the voltage required for PCME was 0.538–0.765 V at 10 mA/cm2, and the average current efficiency was up to 93.7%. Therefore, the energy consumption in soda ash production can be reduced to 5.32 GJ/ton soda ash, a decrease of about 60.9% compared with the Solvay process.