共查询到19条相似文献,搜索用时 110 毫秒
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利用常压搅拌吸收-解吸装置,在不同温度和浓度条件下,对MEA(乙醇胺)、DEA(二乙醇胺)、MDEA(N-甲基二乙醇胺)、TETA(三乙烯四胺)、DETA(二乙烯三胺)5种有机胺吸收解吸CO2进行研究.探讨了反应温度、吸收液浓度、有机胺种类对CO2吸收和解吸过程的影响规律,并利用正交试验法筛选出性能较好的混合胺复配剂.结果表明,当TETA/DEA=5:1,吸收温度为318K,解吸温度为388K时,混合胺具有较优的吸收解吸综合性能. 相似文献
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在温度333K、压力0.1MPa下,研究了溶质总量一定的位阻胺(CHA)溶液在不同浓度下CO2的吸收性能,考察了吸收过程中吸收速率、吸收量及吸收时间的相互关系,并将其与MEA溶液的吸收性能进行了对比.控制解吸温度为373K,考察了两种吸收液的CO2解吸量和解吸时间的关系.对两种吸收富液进行腐蚀实验.实验表明,CHA较适用于捕集低分压下的CO2;适当降低有机胺吸收液的浓度有利于充分发挥其对CO2的吸收性能;单位物质的量的CHA对CO2的吸收量高于在相同条件下的MEA对CO2的吸收量.CHA的腐蚀率明显低于MEA的腐蚀率.从循环利用和降低能耗的角度出发,CHA具有较高的研究价值和广泛应用前景. 相似文献
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控制和减缓化石燃料电厂的二氧化碳排放对于缓解大气中二氧化碳浓度的持续上升具有重要意义。作为一种燃烧后CO2捕集技术,固体二氧化碳吸附剂具有低能耗、弱腐蚀性、易再生等优点,在二氧化碳减排领域有着广泛的应用前景。主要综述了温度对固体吸附剂吸附二氧化碳的影响,对比分析了多种多孔材料吸附剂的特点,重点介绍了浸渍法制备的固态有机胺吸附剂,介绍了温度对固态胺吸附剂吸附性能的影响机理。在此基础上对比了不同的固态胺吸附剂在75℃下对CO2的吸附能力。分析发现,相对于其他类型的二氧化碳固体吸附剂,固态胺吸附剂是一种适用于从高温湿烟气中捕集二氧化碳的吸附剂。 相似文献
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采用双搅拌釜吸收反应器,对一乙醇胺(MEA)和N-甲基二乙醇胺(MDEA)混合有机胺水溶液吸收模拟烟道气中CO2进行机理研究.结果表明,此混胺体系吸收效果显著;比较实验测定和双膜简化理论计算的反应增强因子E值符合程度;建立能表征混合有机胺吸收CO2时发生化学反应交互作用的机理模型,提出相关系数.对总胺浓度2.0mol/L,MEA初始浓度在0.3~0.5mol/L混胺溶液而言,可用吸收负荷L函数表示: = (L) = 0.12+0.35e-L/0.026 相似文献
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四原子氮有机胺三乙烯四胺吸收CO2的研究 总被引:1,自引:0,他引:1
在常压下,采用搅拌式反应器对三乙烯四胺(简写为TETA)吸收CO2进行了研究.测定了不同温度下,不同浓度的TETA对CO2的吸收情况,并与常用的醇胺吸收剂一乙醇胺(简写为MEA)、二乙醇胺(简写为DEA)、三乙醇胺(简写为TEA)的吸收效果作了比较;同时研究了TETA-有机胺-水三元混合体系对CO2 的吸收情况,结果表明:TEA-TEA-H2O对CO2 的吸收效果最好,且TETA/TEA=1/1时,吸收量最大,吸收速率最快. 相似文献
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吸收CO2新型混合化学吸收剂的研究 总被引:2,自引:0,他引:2
以吸收剂吸收速率和再生程度为指标,在小型实验装置台上研究了3种混合吸收剂不同配比的吸收和再生特性,以确定其吸收剂主体和添加剂的合适配比.结果表明,在甲基二乙醇胺(MDEA)中添加哌嗪(PZ),当混合吸收液CO2负荷为0.2 mol·mol-1时,MDEA∶PZ=1∶0.4(m∶m)混合液CO2吸收速率比MDEA∶PZ=1∶0.2(m∶m)混合液提高了约70%.再生40 min,PZ 相对浓度为0的吸收液再生程度为91.04%,PZ相对浓度为0.2、0.4和0.8时,混合吸收液的再生程度分别降低为83.06%、77.77%和76.67%.综合比较,MDEA∶PZ=1∶0.4(m∶m)是该混合吸收液合适的配比,吸收速率和再生特性都有较好改善.在10%一级胺中添加2%三级胺既能保持高吸收效率,又能略微降低再生能耗.在10%二乙醇胺(DEA)中加入2%2-氨基-2-甲基-1-丙醇(AMP),混合液表现出DEA/AMP混合吸收剂中较好的吸收和再生特性.3种配方中,在一级胺中添加少量三级胺吸收速率最高,二级胺和少量空间位阻胺混合吸收剂的再生性能最好.而综合吸收和再生2个指标,三级胺和中量活化剂的混合液有优势. 相似文献
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The formation of toxic nitrogenous disinfection byproducts (N-DBPs), such as nitrosamines, halonitromethanes and haloacetonitriles, from reactions between chlorine/chloramine and dissolved organic nitrogen in drinking water has caused great concern with regarding public health. This study revealed the occurrence of 17 aliphatic amines, some of which have been confirmed to be the precursors of N-DBPs, in source water across China. A sensitive method based on benzenesulfonyl chloride derivatization and liquid-liquid extraction followed by GC-MS analysis was established for the simultaneous analysis of the selected amines in aqueous samples. In total, 37 source water samples from the capital cities of 20 provinces were collected for the survey. Among the 17 amines, 14 were detected with an average frequency of detection of 36%. The most relevant amines in terms of frequency and maximum concentrations detected were dimethylamine (100%, 24.82 μg/L), methylamine (78%, 0.92 μg/L), N-methylethylamine (70%, 8.84 μg/L), propylamine (59%, 10.69 μg/L), diethylamine (54%, 3.76 μg/L), N-methylbutylamine (35%, 3.07 μg/L), N-ethylpropylamine (35%, 0.52 μg/L), and piperidine (32%, 2.35 μg/L). This is the first large scale survey of the aliphatic amines occurrence in source water in the world. The wide presence of nitrosamine precursors like dimethylamine, N-methylethylamine and diethylamine, and the precursors of haloacetonitriles and halonitromethanes like methylamine and propylamine suggests that better source water management is required to ensure the safety of drinking water. 相似文献
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延迟焦化装置冷焦水处理系统原采用半敞开式循环冷却工艺,焦炭塔顶高温溢流水进入冷焦热水罐及在凉水塔的冷却过程中,污水中含硫化氢的混合性气体加上罐内存有的有害气体逸放进入大气中,散发出强烈恶臭,严重污染周围环境.冷焦水密闭系统通过对冷焦水密闭控制,在冷焦热水罐顶增设胺液脱臭工艺,彻底解决了原来冷焦水恶臭污染环境这一难题. 相似文献
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Adsorption of formaldehyde vapor by amine-functionalized mesoporous
silica materials 总被引:1,自引:0,他引:1
The amine-functionalized mesoporous silica materials were prepared via the co-condensation reaction of tetraethoxysilane and three types of organoalkoxysilanes: 3-aminopropyl-trimethoxysilane, n-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and 3-(2-(2- aminoehtylamino)ethylamino) propyl-trimethoxysilane. Cetyltrimethylammonium bromide was used as a template for forming pores, Specific surface area and pore volume of the amine-functionalized mesoporous silica materials were determined using surface area and pore size analyzer. Fourier transform infrared (FTIR) spectroscope was employed for identifying the functional groups on pore surface. In addition, the amine-functionalized mesoporous silica materials were applied as adsorbents for adsorbing formaldehyde vapor. FTIR spectra showed the evidence of the reaction between formaldehyde molecules and amine groups on pore surface of adsorbents. The equilibrium data of formaldehyde adsorbed on the adsorbents were analyzed using the Langmuir, Freundlich and Temkin isotherm. The sample functionalized from n-(2-aminoethyl)-3-aminopropyltrimethoxysilane showed the highest adsorption capacity owing to its amine groups and the large pore diameter. 相似文献
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A novel system was proposed for the capture and separation of CO2 from flue gas. In this method, a resin was employed to regenerate the amine capturing CO2 from flue gas at room temperature. The feasibility for the resin to regenerate amines such as MEA, MAE, TEA, and ammonia was demonstrated. It was also discovered that the resin could be regenerated by hot water. 相似文献
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Carbon dioxide (CO2) adsorption on a standard metal-organic framework Mg2(dobdc) (Mg/DOBDC or Mg-MOF-74) and a tetraethylenepentamine (TEPA) modified Mgz(dobdc) (TEPA-Mg/DOBDC) were investigated and compared. The structural information, surface chemistry and thermal behavior of the adsorbent samples were characterized by X-ray powder diffraction (XRD), infrared spectroscopy (IR), thermogravimetric analysis (TGA) and nitrogen adsorption-desorption isotherm analysis. CO2 adsorption capacity was measured by dynamic adsorption experiments with N2-CO2 mixed gases at 60℃. Results showed that the CO2 adsorption capacity of Mg/DOBDC was significantly improved after amine modification, with an increase from 2.67 to 6.06 mmol CO2/g adsorbent. Moreover, CO2 adsorption on the TEPA-Mg/DOBDC adsorbent was promoted by water vapor, and the adsorption capacity was enhanced to 8.31 mmol CO2/g absorbent. The adsorption capacity of the TEPA-Mg/DOBDC adsorbent dropped only 3% after 5 consecutive adsorption]desorption cycles. Therefore, this kind of adsorbent can be considered as a promising material for the capture of CO2 from flue gas. 相似文献
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本文报道了含氮有机膦及其叔胺氧化物在冷却水系统中的缓蚀与阻垢性能,结果表明,叔胺氧化物与Na_2MoO_4复配时呈现出良好的协同效应. 相似文献