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本文分析了N-甲基-二乙醇胺(MDEA)水溶液吸收二氧化碳过程的国内外研究现状和动态;分析了MDEA水溶液吸收二氧化碳的机理以及该过程降低能耗的可能性;通过实验筛选出活化MDEA脱碳过程中较好的活化剂,测定了活化MDEA的相平衡数据和动力学过程。比较几种脱碳过程。得出活性MDEA脱碳过程是当今低能耗的方法。 相似文献
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MDEA脱碳(即多胺法脱碳或改良法脱碳)是世界近二十年半发展起来的一种低耗脱碳和脱硫方法。它以N-甲基二乙醇胺(MDEA)的水溶液为吸收剂,这是一种具有物理性能的化学吸收剂。为了提高溶液对CO2的吸收速率,常加入少量的活化剂。我厂年产五千吨商品液氨装置就采用了这种方法,溶液配方和操作控制要点由内蒙古石油化工科学研究院提供,整体设计由内蒙古石油化工科学研究院设计。我厂年产五千吨脱碳装置由1996年10月份投入运行以来,至今已累计运行6个多月时间,生产情况良好。运行证明,MDEA脱碳具有以下优点:(卫)生产稳定,可… 相似文献
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基于分子设计的原理,开发了一种醇胺分子结构中具有位阻效应的新型活化剂,评价了由新型活化剂和N-甲基二乙醇胺(MDEA)组成的活化脱碳溶液的吸收性能。试验结果表明,与常规烷醇活化剂相比,新型活化脱碳溶液吸收CO2的速度快、吸收容量大、处理能力高;相同条件下,位阻胺活化剂的处理能力比二乙醇胺(DEA)活化剂提高20%左右。 相似文献
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活性MDEA溶液脱碳技术与变压吸附脱碳技术的比较 总被引:3,自引:0,他引:3
对合成氨工业中活性MDEA溶液与变压吸附脱碳两种技术,从技术性能、工艺技术指标、综合经济效益、经济性等方面进行了分析和比较。 相似文献
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在分析了目标高含硫天然气组分及含量的基础上,采用MDEA/DEA混合胺溶液对高含硫天然气进行脱硫脱碳处理,并对MDEA/DEA法脱硫脱碳工艺的主要参数进行了优化。确定最佳工艺参数为:MDEA/DEA混合胺溶液中MDEA和DEA的质量浓度分别为41.0%和5.0%、MDEA/DEA混合胺溶液循环量为105 m3·h-1、吸收塔压力为4 MPa、吸收塔塔板数为20块、MDEA/DEA混合胺溶液温度为40℃,在此条件下,净化气中H2S和CO2的含量分别为10.69 mg·m-3和2.74%,能够达到GB 17820-2018中二类天然气的质量要求。 相似文献
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对国内某煤层气进行MDEA法脱碳工艺模拟和关键参数分析,可以得出,脱碳率和重沸器负荷随原料气压力(吸收塔压力)升高出现幅度减小性增大;存在一个最佳循环量,使得脱碳率较高而热负荷较低,且随着吸收压力增大,最佳循环量减小;原料气温度对脱碳系统影响很小,进塔贫液温度对其影响较大,存在某一进塔贫液温度点使得脱碳效果最好,且该温度点随吸收塔压力升高而增大;脱碳率随吸收塔塔板数增加而显著增大,与再生塔塔板数无关;重沸器负荷随吸收塔塔板数增加而增大和随再生塔塔板数增大而减小,且变化幅度均减小;MDEA溶液质量分数增大脱碳效果增强,一般MDEA溶液质量分数为40%~50%时效果较好;活化MDEA溶液脱碳效果远远优于MDEA溶液脱碳效果。 相似文献
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总结国产MDEA脱碳技术与MDEA溶液在年产30万吨合成氨装置脱碳系统的应用情况,并对系统运行中存在的腐蚀等问题进行讨论,为国产化MDEA脱碳技术及溶液的推广应用提供借鉴。 相似文献
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熔融碳酸盐是一种良好的热载体和反应介质,其表面张力直接影响反应体系中熔盐分布和界面反应。在熔融盐离子半径和Butler方程的基础上,建立了熔融混合碳酸盐Li2CO3-Na2CO3-K2CO3体系的表面张力计算模型,考察了温度和熔盐组分对表面张力的影响。结果表明:模型计算的表面张力值与实际测量值比较吻合;熔融碳酸盐纯物质的表面张力随着阳离子的静电势(Z/r)的增大而逐渐减小;Li2CO3-Na2CO3-K2CO3体系中,熔盐的表面张力随着温度的升高而减小;混合熔融盐表面张力随着Li2CO3含量的增加而逐渐增大,随着K2CO3含量的增加而逐渐减小。 相似文献
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Muhammad Chawla Hammad Saulat Muhammad Masood Khan Muhammad Mahmood Khan Sikander Rafiq Linjuan Cheng Tanveer Iqbal M. Imran Rasheed Muhammad Zohaib Farooq Muhammad Saeed Nasir M. Ahmad Muhammad Bilal Khan Niazi Sidra Saqib Farrukh Jamil Ahmad Mukhtar Nawshad Muhammad 《化学工程与技术》2020,43(2):184-199
Membrane technology has emerged as a leading tool worldwide for effective CO2 separation because of its well-known advantages, including high surface area, compact design, ease of maintenance, environmentally friendly nature, and cost-effectiveness. Polymeric and inorganic membranes are generally utilized for the separation of gas mixtures. The mixed-matrix membrane (MMM) utilizes the advantages of both polymeric and inorganic membranes to surpass the trade-off limits. The high permeability and selectivity of MMMs by incorporating different types of fillers exhibit the best performance for CO2 separation from natural gas and other flue gases. The recent progress made in the field of MMMs having different types of fillers is emphasized. Specifically, CO2/CH4 and CO2/N2 separation from various types of MMMs are comprehensively reviewed that are closely relevant to natural gas purification and compositional flue gas treatment 相似文献
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《分离科学与技术》2012,47(17):3265-3286
Abstract Supercritical gas extraction for the decaffeination of green coffee beans has become an established method in the last decade. However, because of the commercial aspects in this field, few research results on applications have been published. In this publication, three different methods for the regeneration of caffeineloaded CO2 are presented: depressurization, adsorption with activated carbon, and absorption with water. For all these methods, phase equilibrium experiments with pure caffeine were done. Furthermore, pilot-plant experiments were performed to decaffeinate green coffee beans. 相似文献
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大气中CO2浓度逐年升高,而其高值化利用是实现减排的重要途径之一。低碳烯烃是重要的化工原料,CO2作为碳源加氢制取烯烃(CTO)是缓解化石能源的消耗及温室效应的有效方法之一。铁基催化剂因其优异的催化反应性能,被视为该反应最具应用前景的催化剂之一;但铁基催化剂烯烃选择性仍有待进一步提高。本文综述了铁基催化剂CTO反应研究进展,包括反应热力学分析、理论模型、催化剂设计与开发(助剂和载体对催化剂结构及性能的影响)、反应机理、构-效关系、失活机理等;提出未来催化研究方向,即借助Operando技术聚焦反应过程中催化剂活性相的动态结构变化规律,探究外界因素引起的催化材料表界面的作用机制,为工业催化剂的理性设计提供思路。 相似文献
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利用热重分析仪、扫描电镜和氮吸附仪对不同粒径的K2CO3颗粒和负载型K2CO3/Al2O3二氧化碳吸收剂的碳酸化特性进行研究。负载后的吸收剂比表面积和孔隙结构得到较大改善,使得碳酸化反应速率和转化率均提高,吸收剂碳酸化特性得到改善。纯K2CO3颗粒吸收剂的反应速率和转化率随着粒径的增加而减小,负载型吸收剂的反应速率和转化率随着粒径的增加略增大。研究了不同粒径和反应时间对K2CO3/Al2O3颗粒微观结构的影响,结果表明K2CO3/Al2O3颗粒具有较稳定的微观结构。采用负载型粒子模型对K2CO3/Al2O3吸收剂吸收CO2碳酸化过程进行研究,所建立的粒子模型计算结果与试验值吻合较好。利用建立的模型对不同CO2浓度下K2CO3/Al2O3吸收剂碳酸化反应特性进行模拟计算,模拟结果具备一定的合理性和准确性,为开展进一步研究提供了基础。 相似文献
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Katharina Lommel Dr. Gabriela Schäfer Konstantin Grenader Christoph Ruland Prof. Dr. Andreas Terfort Prof. Dr. Werner Mäntele Dr. Georg Wille 《Chembiochem : a European journal of chemical biology》2013,14(3):372-380
CO2‐consuming reactions, in particular carboxylations, play important roles in technical processes and in nature. Their kinetic behavior and the reaction mechanisms of carboxylating enzymes are difficult to study because CO2 is inconvenient to handle as a gas, exists in equilibrium with bicarbonate in aqueous solution, and typically yields products that show no significant spectroscopic differences from the reactants in the UV/Vis range. Here we demonstrate the utility of 3‐nitrophenylacetic acid and related compounds (caged CO2) in conjunction with infrared spectroscopy as widely applicable tools for the investigation of such reactions, permitting convenient measurement of the kinetics of CO2 consumption. The use of isotopically labeled caged CO2 provides a tool for the assignment of infrared absorption bands, thus aiding insight into reaction intermediates and mechanisms. 相似文献
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CO2 has been widely used in the process of enhanced oil recovery (EOR) over decades. However, the heterogeneity of oil reservoirs renders CO2 to flow preferentially into highly permeable zones, leaving tight areas unswept with oil unrecovered in these areas. While conventional water-swelling gels were used for blocking the “channeling” path, most of them experience the risks of shrinkage under high temperature and CO2-induced acidic environment. Here, we developed double swelling smart polymer microgels (SPMs) triggered by both heat and CO2. Such SPMs were prepared by copolymerization of acrylamide (AAm) in combination with N,N-2-(dimethylamino)ethyl methacrylate (DMAEMA) and [2-(methacryloyloxy) ethyl]dimethyl-(3-sulfopropyl) ammonium hydroxide (SBMA), and with N,N′-methylene bisacrylamide (MBA) as the crosslinker. These SPMs swell when temperature is higher than 65 °C or in the presence of CO2, with an ameliorative salinity tolerance ability. Artificial sand pack flooding carried by SMPs at 65 °C showed an elevated plugging efficiency at around 97% under a simulated pressurization at 5 MPa, proposing a valid candidate for future EOR applications during CO2 flooding. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48305. 相似文献