络合亚铁乙二醇-四丁基溴化铵低共熔溶剂协同吸收SO2和NO

doi:10.16085/j.issn.1000-6613.2019-0714

摘要/Abstract

摘要：

低共熔溶剂广泛应用于很多领域，尤其在气体净化领域有很好的应用前景。为探究吸收容量大、再生能力较强的低共熔溶剂协同吸收烟气中SO₂和NO的性能，采用氯化亚铁（FeCl₂）、乙二醇（EG）与四丁基溴化铵（TBAB）制备络合亚铁乙二醇-四丁基溴化铵低共熔溶剂［Fe(Ⅱ)EG-TBAB DESs］，重点考察了温度、停留时间、氧气分压和FeCl₂浓度等因素对低共熔溶剂脱除烟气中SO₂和NO性能的影响。结果表明：在温度为50℃、氧气分压为5%、FeCl₂浓度为0.1mol/L的条件下，Fe(Ⅱ) EG-TBAB DESs能够协同高效吸收烟气中的SO₂和NO。烟气中H₂O和O₂存在的条件下，SO₂气体能够形成 $H S O 3 -$ 和 $H S O 4 -$ ，进一步促进Fe(Ⅱ) EG-TBAB低共熔溶剂吸收烟气中NO气体，生成Fe(Ⅱ)EG-TBAB(NO)。低共熔溶剂经6次吸收-脱附再生循环后其脱硫脱硝能力变化不大，仍保持较好的脱硫脱硝稳定性。

关键词: 烟道气, 脱硫脱硝, 络合亚铁乙二醇-四丁基溴化铵低共熔溶剂, 吸收, 再生

Abstract:

Deep eutectic solvents (DESs) are widely used in many fields, especially in the field of gas purification. To investigate the synergistic absorption performance of the DESs with high absorption capacity and strong regenerative capacity to absorbing SO₂ and NO in flue gas, Fe(Ⅱ)EG-TBAB DESs was prepared by using ferrous chloride (FeCl₂), ethylene glycol (EG) and tetrabutyl ammonium bromide (TBAB). Effect of temperature, residence time, oxygen partial pressure and concentration of FeCl₂ on the removal of NO in the flue gas were investigated. The inlet and outlet concentration of SO₂ and NO at the spray scrubber reactor were measured using online flue gas analyzer to characterized desulfurization and denitrification performance of Fe(Ⅱ)EG-TBAB DESs. The results showed that under the condition of 0.1mol/L FeCl₂, temperature of 50℃, the oxygen partial pressure of 5%, Fe(Ⅱ)EG-TBAB DESs showed the best desulfurization and denitrification performance. The presence of H₂O and O₂ in the flue gas, SO₂ gas can form $H S O 3 -$ ^{and $H S O 4 -$ , to further promote the absorption of NO in Fe(Ⅱ)EG-TBAB DESs, resulting in the formation of Fe(Ⅱ)EG-TBAB(NO). After sixth absorption-desorption cycles, the desulfurization and denitrification capacity of the samples have no obviously changed and show good desulfurization and denitrification stability.}

Key words: flue gas, desulfurization and denitrification, Fe(Ⅱ)EG-TBAB DESs, absorption, regeneration

中图分类号:

TQ534.9

窦金孝,赵永奇,段晓谞,柴红宁,余江龙. 络合亚铁乙二醇-四丁基溴化铵低共熔溶剂协同吸收SO₂和NO[J]. 化工进展, 2020, 39(2): 453-460.

Jinxiao DOU,Yongqi ZHAO,Xiaoxu DUAN,Hongning CHAI,Jianglong YU. Co-adsorption of SO₂ and NO from flue gas using Fe(Ⅱ)EG-TBAB deep eutectic solvents[J]. Chemical Industry and Engineering Progress, 2020, 39(2): 453-460.

图/表 8

图1 Fe(Ⅱ)EG-TBAB DESs低共熔溶剂吸收SO2和NO的实验装置

图2 不同亚铁离子浓度条件下Fe(Ⅱ)EG-TBAB DESs的脱硫脱硝性能（实验条件：温度50℃，停留时间1.0s，O2 5%）

图3 不同亚铁离子浓度下Fe(Ⅱ)EG-TBAB DESs的硫容和硝容

图4 温度对Fe(Ⅱ) EG-TBAB DESs的脱硫脱硝性能的影响（实验条件：停留时间1.0s，O2 5%，Fe2+ 0.1mol·L-1）

图5 烟气在溶剂中停留时间对Fe(Ⅱ) EG-TBAB DESs的脱硫脱硝能力的影响

图6 氧分压对Fe(Ⅱ) EG-TBAB DESs脱硫脱硝性能的影响（实验条件：温度50℃，停留时间1.0s，Fe2+ 0.1mol·L-1）

图7 不同水蒸气含量对低共熔溶剂吸收SO2和NO的影响（实验条件：温度50℃，停留时间1.0s，O2 5%，Fe2+ 0.1mol·L-1）

图8 6次吸收-再生循环后溶剂脱硫脱硝能力的变化

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络合亚铁乙二醇-四丁基溴化铵低共熔溶剂协同吸收SO₂和NO

Co-adsorption of SO₂ and NO from flue gas using Fe(Ⅱ)EG-TBAB deep eutectic solvents

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