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MDEA-TBEE复合溶剂吸收酸性气体性能的研究 总被引:6,自引:0,他引:6
合成了一种空间位阻胺TBEE(叔丁氨基乙氧基乙醇),并添加在MDEA溶剂中组成MDEA-TBEE复合溶剂。设计了,一套新颖的气体吸收装置-恒温填料反应器,测定了该复合溶剂吸收酸性气体(H2S,CO2)的性能。通过大量的实验数据,分析了影响吸收性能的各种因素(如吸收剂浓度、MDEA/TBEE摩尔比、反应温度及溶液负载),并将复合溶剂的吸收性能同MDEA及其它有机胺(MEA、DEA、DIPA)作了比较。实验表明,与MDEA或其它有机胺比较,MDEA-TBEE复合溶剂具有更高的吸收负荷和对H2S具有高选择性。实验同时证明了空间位阻胺是一种优良的酸性气体吸收剂。 相似文献
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文章介绍了MDEA的性质、用途和吸收H2S和CO2的反应机理,应用ASPEN PLUS软件模拟分析了MDEA溶液吸收含H2S酸性气的过程,提出适宜的MDEA浓度、较少的理论板数、较低的操作压力和温度有利于选择性吸收H2S;模拟了溶剂吸收和再生的过程,得到合适的计算结果,为工业设计提供依据。 相似文献
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Na2S溶液吸收低浓度SO2的控制步骤分析 总被引:1,自引:0,他引:1
在一个半连续式反应器中采用硫化钠溶液吸收低浓度的SO2气体,随着SO2吸收量的增加,吸收液中pH值的变化出现两次突降,表现为三阶段模式.pH值第二次突降后的第三阶段吸收液失去完全吸收SO2的能力.SO2吸收的增强因子的变化范围为2.29+6.9×10-10C-H2i+1.1×10-2C-1H+i-(6.9×10-10C-2H+1.1×10-2C-1H+1)CSO2i/CSO21<φ<2.29+6.9×10-10C-2H+i+1.1×10-2C-1H+1,结合Gianni根据增强因子大小判断气体吸收的传质阻力控制步骤的分析,得出在本研究体系中,当吸收液pH>3.46时硫化钠溶液吸收低浓度的SO2气体的过程为气侧传质阻力控制.这一结论正好与实验相符. 相似文献
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膜基-氨基酸盐及其复合溶液吸收CO2的性能 总被引:2,自引:3,他引:2
选择了氨基乙酸(GLY)和氨基丙酸(ALA)的盐溶液作为CO2吸收剂,将高效活化剂哌嗪(PZ)添加于GLY形成新型氨基酸基复合溶液,采用膜接触器-再生循环装置,研究了液速、吸收剂浓度等因素对总传质系数和脱除率的影响,评价和比较了GLY和ALA及其复合溶液的吸收性能。结果表明:GLY的传质推动力大于ALA,GLY的总传质系数和脱除率大于ALA;在吸收剂浓度对总传质系数的影响程度上,GLY大于ALA;复合溶液的吸收性能明显优于单一的氨基酸盐溶液,少量的PZ能显著地增强传质效率。 相似文献
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氧化铝生产赤泥附液吸收H_2S实验研究 总被引:1,自引:0,他引:1
对氧化铝生产附产赤泥吸收净化H2 S废气进行了实验研究 ,赤泥附液吸收H2 S具有吸收效率高、吸收容量大、易控制 ,操作简便等优点 ,在较少时间内对H2 S的吸收效率保持在 90 %以上。 相似文献
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采用搅拌实验装置,研究不同摩尔配比的MDEA-PZ复合胺溶液对烟道气中CO2的吸收和解吸性能,揭示了吸收速率、吸收量与吸收时间、pH值、电位之间的内在联系;对CO2初始逸出温度、试液再生温度、再生率、再生pH值下降率进行了分析。结果表明,MDEA—PZ二元复合体系吸收效果优于单组分MDEA、PZ的吸收效果。MDEA—PZ复合胺溶液摩尔配比为0.5:0.5时,吸收效果最佳,吸收量约为0.8mol·L^-1;CO2初始逸出温度最低,为54℃;再生温度最低,为102℃;再生率最高,为88.61%;再生pH值下降率最低,为11.39%。MDEA-PZ复合体系的两种组分之间存在正交互作用。 相似文献
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采用Na2CO3溶液在填料塔中分别吸收高、低浓度H2S气体,通过测定总体积传质系数(KGa),采用基于Box-Behnken设计的响应面分析方法研究吸收液流量、浓度和气体流量对KGa的影响,建立了Na2CO3溶液吸收高、低浓度H2S的二次响应曲面模型. 结果表明,在高、低H2S吸收体系中,各因素对KGa的影响规律基本一致,在低浓度H2S吸收体系中对KGa的影响更大. KGa与3个因素之间不是简单的单调函数关系,吸收液流量和浓度具有较强的相互增效作用. 处理H2S浓度为2.16%(j)、气体流量为720 L/h的体系时,当吸收液浓度为0.082 mol/L、其流量为11.28 L/h时,KGa最大;处理H2S浓度为20.1%(j)、气体流量为720 L/h的体系时,吸收液浓度为0.764 mol/L、其流量为11.28 L/h时,KGa最大. 相似文献
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Hydrophobic protic ionic liquids tethered with tertiary amine group for highly efficient and selective absorption of H2S from CO2 下载免费PDF全文
Kuan Huang Xiao‐Min Zhang Xing‐Bang Hu You‐Ting Wu 《American Institute of Chemical Engineers》2016,62(12):4480-4490
Developing absorbents with both high absorption capacity of H2S and large selectivity of H2S/CO2 is very important for natural gas sweetening process. To this end, a class of novel hydrophobic protic ionic liquids (ILs) containing free tertiary amine group as functional site for the absorption of H2S were designed in this work. They were facilely synthesized through a simple neutralization‐metathesis methodology by utilizing diamine compounds and bis(trifluoromethylsulfonyl)imide as the building blocks for cation and anion, respectively. Impressively, the solubility of H2S can reach 0.546 mol mol?1 (1 bar) and 0.225 mol mol?1 (0.1 bar), and the selectivity of H2S/CO2 can reach 37.2 (H2S solubility at 1 bar vs. CO2 solubility at 1 bar) and 15.4 (H2S solubility at 0.1 bar vs. CO2 solubility at 1 bar) in the hydrophobic protic ILs at 298.2 K. Comparing the hydrophobic protic ILs with other absorbents justifies their superior performance in the selective absorption of H2S from CO2. © 2016 American Institute of Chemical Engineers AIChE J, 62: 4480–4490, 2016 相似文献
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The absorption of H2S into aqueous methyldiethanolamine (MDEA) was studied experimentally over the temperature range 15 to 35°C and for MDEA concentrations from 10 to 25 wt% using a laminar liquid jet device and a stirred-cell absorber. The contact times ranged from 2 × 10-3 to 1 × 10-2 seconds for the jet absorber and from 6 to 38 seconds for the stirred-cell absorber. It was found that the absorption rate data for both devices could be modelled assuming an instantaneous reaction regime for the reaction between H2S and MDEA. The experimental results were interpreted to give an estimate for the diffusion coefficient of MDEA in water. Diffusion coefficient results are consistent for the two apparatuses. A lower bound for the second-order rate constant for the reaction between H2S and MDEA is estimated from the experimental data to be 1.4 × 1010cm3/g mole s at 25°C 相似文献
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为了研究以N-甲基二乙醇胺(MDEA)为主体的MDEA+一乙醇胺(MEA)和MDEA+二乙烯三胺(DETA)两种配方混合胺液脱除H2S性能,给工业中天然气脱硫配方提供参考和基础数据。利用小型反应釜进行吸收实验,使用单一MDEA胺液进行了工艺参数的筛选,同时考察吸收温度、吸收压力、再生温度对胺液脱除H2S性能影响,得出升高吸收温度、吸收压力均可在一定程度内提升MDEA胺液的H2S吸收效果,但当吸收温度过高时会降低胺液的H2S吸收效果,吸收压力过高会造成脱硫成本的增加,筛选出最优吸收温度50℃,吸收压力5MPa,解吸油浴温度125℃。在优选出的实验工艺参数条件下进行不同添加剂对MDEA胺液脱除H2S性能影响研究,考察不同配比的MDEA+DETA混合胺液和MDEA+MEA混合胺液脱除天然气中H2S吸收及解吸性能。通过分析不同配比胺液的吸收负荷、吸收速率及解吸率等指标得出,MDEA单一胺液中添加二乙烯三胺(DETA)、一乙醇胺(MEA)胺液均可提升其H2S吸收性能但并不利于胺液H2S解吸性能的提升。性能较优配方为2.4mol/L MDEA+0.6mol/L MEA、2.4mol/L MDEA+0.6mol/L DETA混合胺液。 相似文献
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CO2、H2、N2在MDEA水溶液中的溶解度徐国文张成芳钦淑均(华东理工大学无机化工研究所,上海200237)关键词:CO2H2N2溶解度MDEA1前言国外报道的CO2溶解度数据[1~9],布点稀疏,无法满足工程计算及动力学研究之需。王挹薇等采... 相似文献
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Kuan Huang Xiao‐Min Zhang Yun Xu You‐Ting Wu Xing‐Bang Hu Yun Xu 《American Institute of Chemical Engineers》2014,60(12):4232-4240
The solubilities of H2S and CO2 in four protic ionic liquids (PILs)—methyldiethanolammonium acetate, methyldiethanolammonium formate, dimethylethanolammonium acetate, and dimethylethanolammonium formate were determined at 303.2–333.2 K and 0–1.2 bar. It is shown PILs have higher absorption capacity for H2S than normal ionic liquids (ILs) and the Henry's law constants of H2S in PILs (3.5–11.5 bar at 303.2 K) are much lower than those in normal ILs. In contrast, the solubility of CO2 in PILs is found to be a magnitude lower than that of H2S, implying these PILs have both higher absorption capacity for H2S and higher ideal selectivity of H2S/CO2 (8.9–19.5 at 303.2 K) in comparison with normal ILs. The behavior of H2S and CO2 absorption in PILs is further demonstrated based on thermodynamic analysis. The results illustrate that PILs are a kind of promising absorbents for the selective separation of H2S/CO2 and believed to have potential use in gas sweetening. © 2014 American Institute of Chemical Engineers AIChE J 60: 4232–4240, 2014 相似文献