双极膜电渗析资源化巯基乙酸钠废水再生巯基乙酸的研究

doi:10.19964/j.issn.1006-4990.2024-0079

Abstract

Abstract:

A lot of sodium thioglycolate as the main constituent of sulfur ammonia ester tail liquid is difficult to treat due to its high toxic，high salinity and high COD（Chemical Oxygen Demand） properties.The traditional disposal composite process of extraction-filtration-acidification-distillation exsits complex processes，high disposal costs and secondary pollution.In order to solve the resource utilization of sodium thioglycolate wastewater，the bipolar membrane electrodialysis device（BMED） with three-compartment configuration was used，which could convert salts into corresponding acids and bases.The effects of the reaction time，the reaction temperature，current density and plate thickness on the conversion efficiency，current efficiency，membrane voltage，energy consumption were investigated.The experiments showed that the optimum experimental conditions were 75 min，40 ℃，400 A/m² and 50 μm.Under those conditions，the conversion rate of sodium thioglycolate was up to 98.32%，the current efficiency was 86.01%，and the energy consumption was 93.54 kW·h/t.The results can provide a reference for a new process idea for the production of thioglycolic acid from sodium thioglycolate wastewater in industrial production.

Key words: bipolar membrane, electrodialysis, regeneratio, sodium thioglycolate wastewater, thioglycolic acid

CLC Number:

TQ028.8

ZHANG Li, LOU Yufeng, ZHANG Wei, LIU Fangwang, LAN Jing, ZHAO Zongshan, FU Kunming. Research of regeneration of thioglycolic acid by bipolar membrane electrodialysis using sodium thioglycolate wastewater as resource[J]. Inorganic Chemicals Industry, 2025, 57(2): 120-129.

Figures/Tables 9

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Table 1

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电流密度/ （A·m^-2）	反应时间/ min	酸室水损失/ %	碱室水损失/ %	平均膜对电压/V	碱室氢氧化钠质量分数/%	碱室电流效率/%	生产能力/ ［L·（h·m²）^-1］
1 000	45	12.50	-5.00	2.54	13.21	76.15	12.69
700	60	10.00	-10.00	2.09	10.78	72.03	9.52
600	66	8.75	-7.50	1.90	12.63	76.60	8.65
500	75	8.75	-7.50	1.76	12.34	76.60	7.61
400	84	8.12	-6.25	1.69	12.53	74.96	6.80
300	108	7.50	-3.75	1.58	12.63	75.13	5.29

批次	产酸浓度/（mol·L^-1）	产碱质量分数/%	酸室电流效率/%	转化率/ %	生产能耗/（kW·h·t^-1）
1	1.65	11.73	77.05	95.37	99.72
5	1.76	12.36	78.87	97.21	96.54
10	1.80	12.49	76.98	96.82	96.73
15	1.78	12.52	76.59	98.10	102.89
20	1.81	12.48	77.10	96.99	100.65
25	1.81	12.59	77.77	97.17	99.99
30	1.79	12.52	77.93	96.88	97.16

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Research of regeneration of thioglycolic acid by bipolar membrane electrodialysis using sodium thioglycolate wastewater as resource

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