双极膜电渗析资源化硝酸钠制酸碱

doi:10.19964/j.issn.1006-4990.2023-0514

Abstract

Abstract:

In industrial production activities，high⁃salt wastewater containing NaNO₃ is usually produced，which is a recyclable resource.The corresponding acids and bases of high salt wastewater can be prepared by bipolar membrane electrodialysis（BMED）.The technique is of great significance for the resource utilization of high⁃salt wastewater.In this experiment，a three⁃compartment bipolar membrane electrodialysis membrane stack configuration was used to simulate high⁃salt wastewater with NaNO₃ solution to prepare HNO₃ and NaOH.The experiment used energy consumption，current efficiency，and conversion rate as evaluation indexes.The effects of current density，the concentration of raw material solution，type and concentration of polar liquid，and initial concentration of acid⁃base chamber solution，on the preparation of acid⁃base by BMED were investigated.The results showed that when the current density was increased，an increase in the salt conversion rate and energy consumption could be observed.An increase in current efficiency and a decrease in energy consumption could be found as the concentration of raw material solution was increased.However，the concentration of raw material solution was too high，which would cause the current efficiency to decrease obviously.3%NaOH was best for polar solution.When the initial concentration of the acid⁃base chamber was increased，an increase in the salt conversion rate and a decrease in energy consumption could be observed.The parameters were optimized as follows：the operating voltage was 35 V，the operating current density was 700 A/m²，the initial concentration of the acid⁃base chamber was 0.05 mol/L，the raw material liquid was 12% sodium nitrate，and the polar liquid was 3%NaOH.Under these conditions，the concentration of base was 2.227 mol/L，the salt conversion rate was up to 93.42%，the current efficiency was 60.83%，and energy consumption was 3.23 kW·h/kg.The research results could provide a reference for the resource utilization of NaNO₃ high salt wastewater in industrial production.

Key words: bipolar membrane electrodialysis, sodium nitrate, sodium hydroxide

CLC Number:

TQ131.12

FAN Le, LI Hao, LIU Guochang, XU Shoujiang, WANG Haitao, LI Guocai, CHANG Na. Preparation of acid-base by bipolar membrane electrodialysis using NaNO₃ as resource[J]. Inorganic Chemicals Industry, 2024, 56(7): 104-111.

Figures/Tables 10

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电流密度/（A·m^-2）	运行时间/min	碱浓度/ （mol·L^-1）	转化率/%	电流效率/%	能耗/ （kW·h·kg^-1）
400	195	2.012	82.32	49.03	2.85
500	150	2.090	82.06	50.40	3.15
600	120	2.007	82.27	53.00	3.28
700	105	2.108	85.62	54.45	3.54
800	90	2.069	86.75	55.71	3.66

极液	运行时间/min	碱浓度/ （mol·L^-1）	转化率/%	电流效率/%	能耗/ （kW·h·kg^-1）
2% NaOH	105	2.153	84.30	52.74	3.56
3% NaOH	105	2.117	86.03	55.01	3.45
4% NaOH	105	2.008	84.30	52.89	3.54
3% Na₂SO₄	105	2.106	86.19	54.07	3.91

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Preparation of acid-base by bipolar membrane electrodialysis using NaNO₃ as resource

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Preparation of acid-base by bipolar membrane electrodialysis using NaNO3 as resource