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In this work,the use of sepiolite for the removal of carbon dioxide from a carbon diox- ide/methane mixture by a pressure swing adsorption(PSA)process has been researched.Adsorption equilibrium and kinetics have been measured in a fixed-bed,and the adsorption equilibrium parameters of carbon dioxide and methane on sepiolite have been obtained.A model based on the LDF approxima- tion has been employed to simulate the fixed-bed kinetics,using the Langmuir equation to describe the adsorption equilibrium isotherm.The functioning of a PSA cycle for separating carbon dioxide/methane mixtures using sepiolite as adsorbent has also been studied.The experimental results were compared with the ones predicted by the model adapted to a PSA system.Methane with purity higher than 97% can be obtained from feeds containing carbon dioxide with concentrations ranging from 34% to 56% with the proposed PSA cycle.These results suggest that sepiolite is an adsorbent with good properties for its employment in a PSA cycle for carbon dioxide removal from landfill gases. 相似文献
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Cr 助剂对 Fe 基催化剂结构和费托合成性能的影响 总被引:1,自引:0,他引:1
采用 N2 吸附-脱附、X 射线衍射、穆斯堡尔谱、X 射线光电子能谱、程序升温还原和热重分析等技术研究了助剂 Cr 含量对 Fe 基费托合成催化剂的织构性质、还原行为以及物相变化的影响. 在 H2/CO = 2.0, 260~300 oC, 1.5 MPa 和 2 000 ml/(g•h) 条件下, 在固定床反应器中考察了 Cr 含量对 Fe 基催化剂费托合成反应活性和产物烃选择性的影响. 结果表明, 在氧化态催化剂中, Cr 助剂与 Fe 物相存在较强的相互作用, 形成固溶体相 α-(Cr1-xFex)2O3; 随着 Cr 含量的增加, 逐渐由单一的富 Fe 相 α-(Fe1-xCrx)2O3 向富 Fe 相和富 Cr 相 α-(Cr1-yFey)2O3 两相过渡. Fe-Cr 固溶体的生成显著抑制了催化剂的还原, 导致催化剂还原度降低, 因而催化剂活性下降. 同时, Cr 的添加提高了甲烷和轻质烃选择性, 但抑制了水煤气变换活性. 相似文献
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本文提出了轴向流固定床反应器的流动模型和基本方程。运用有限差分法计算了这种反应器内部的流场。 相似文献
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使用Crank-Nicolson隐格式差分法求解耐硫甲烷化固定床反应器的二维拟均相模型,通过模拟分析,考究管径、管数、反应气入口状态(压力、温度)、溶盐流量及入口温度对反应器操作的影响。对5万Nm^3/d煤气的反应器进行优化设计分析,为该工指导。 相似文献
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分析了绝热固定床反应器的参数灵敏性,建立了参数灵敏度的微分方程,提出了求解参数灵敏度方程的简便方法,并对固定床反应器中进行的工业反应实例进行了模拟计算和分析。 相似文献
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选取稻草、水洗稻草及添加质量分数为5%KCl的微晶纤维素颗粒作为热解原料,进行固定床快速和慢速热解,研究稻草热解过程中全钾和四种赋存状态钾的析出规律以及四种赋存状态钾之间的相互迁移转化。结果表明,稻草热解过程中钾的析出率随温度变化分为两个区间,热解温度低于700℃时钾的析出率受温度影响较小;热解温度高于700℃时四种赋存状态钾相继达到释放点从而导致钾析出率急剧增加;热解过程中钾的析出主要是由水溶态和残渣态钾的减少造成;同时水溶态钾和有机态钾能够发生相互迁移转化;残渣态的碳骨架钾在热解时断裂,一部分转化成水溶态钾,一部分仍以残渣态钾存在。 相似文献
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J. M. Nazzal 《Journal of Thermal Analysis and Calorimetry》2001,65(3):847-857
Jordan oil shale from El-Lajjun deposit was pyrolysed in a fixed-bed pyrolysis reactor and the influence of the pyrolysis
temperature between 400 to 620°C and the influence of the pyrolysis atmosphere using nitrogen and nitrogen/steam on the product
yield and gas composition were investigated. The gases analysed were H2, CO, CO2 and hydrocarbons from C1 to C4. The results showed for both nitrogen and nitrogen/steam that increase the pyrolysis bed temperature from 400 to 520°C resulted
in a significant increase in the oil yield, after which temperature the oil yield decreased. The alkene/alkane ratio including
ethene/ethane, propene/propane, and butene/butane ratios, can be used as an indication of pyrolysis temperature and the magnitude
of cracking reactions. Increasing alkene/alkane ratio occurring with increasing pyrolysis temperature. The alkene/alkane ratio
for nitrogen/steam pyrolysis atmosphere was lower than the one found under nitrogen atmosphere.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献