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师殿峰 《数理化学习(高中版)》2015,(3):37-39
甲烷、乙烯和苯分别是烷烃、烯烃和芳香烃的代表物.学好甲烷、乙烯和苯,对学习烷烃、烯烃和芳香烃有着重要的意义.为帮助同学们学习甲烷、乙烯和苯,现对其进行分析归纳,并举例说明其考查方式和解题思路.一、甲烷1.分子结构甲烷的分子式为CH4,电子式为 相似文献
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1 烯烃概念的建立 乙烯是烯烃的代表化合物,学习乙烯之前,必须建立稀烃的概念. 通过对比分析乙烷、乙烯的分子式、电子式、结构式、结构简式,找出它们结构特点的差异,即乙烷分子中,C、C原子间以单键相结合成链状,碳原子剩余的价键全部与氢原子结合,每个碳原子的化合价都 相似文献
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本文以乙烯和乙炔为烯炔的代表物质,从结构化学的角度来探讨烯烃与炔烃在化学活泼性方面的差异:在亲电反应中,烯烃比炔烃活泼;在亲核反应中,炔烃比烯烃活泼;炔烃α氢原子活泼,因而有独特的反应。在分析它们化学性质上的差异时,必须抓住分子结构这个主要矛盾,才能得出辩证唯物主义的合乎实际的正确结论。 相似文献
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环己烷液相催化氧化制备环己醇、环己酮是目前国内外生产锦纶单体的主要工艺.在国内工业生产上一般采用环烷酸钴作催化剂、在433K、10kg·cm-2的条件下进行反应.但是这种过程效率低,且副反应较多.因此,根据文献资料,选用二苯甲酰甲烷钴、二苯甲酰甲烷氧钒分别作催化剂,在相似的操作条件下,在以下四个方面与环烷酸钴作催化剂进行比较反应中间产物及最终产物在不同时刻量的多少;中间产物达到最大量时所需的时间;反应速率的快慢;反应转化率的大小. 相似文献
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Experimental study has been conducted to determine the solubility of natural gas in liquid at temperatures of 293.15, 298.15, 303.15 and 313.15 K at atmosphere pressure. Ethanol, n-bexane and n-heptane were selected as solvents in the experiment. The solubility data of methane in the mixing solvents were determined and the experimental data were calculated with the PR and PRSV equation of state(EOS). The calculated average absolute deviations for the two kinds of ternary systems CH4/n-C6H14-C2H6O and CH4/n-C7H16-C2H6O are 1.92% and 1.85% for PR EOS and 2.11% and 1.87% for PRSV EOS, respectively. 相似文献
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The aim of this study was to understand and characterize the adsorption of small alkanes, namely methane, ethane and propane, in zeolite TON through detailed Monte Carlo simulations. The isotherms of pure components were calculated and showed good agreement with experimental data. The adsorption positions, adsorption energy of pure components and isotherms of mixtures were also simulated and the results are discussed. 相似文献
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水合物法分离H2+C2H4气体混合物相平衡实验研究 总被引：1，自引：0，他引：1
李其京 《荆门职业技术学院学报》2007,22(9):6-8
采用水合物吸收法,以THF为吸收剂,进行了吸收法分离(H2 C2H4)气体混合物的相平衡实验研究。结果表明,采用THF做吸收剂可望获得很好的(H2 C2H4)气体混合物吸收分离效果。 相似文献
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焦华 《渭南师范学院学报》2012,(6):64-67
通过Fe与C4H4O6Na2溶液在140---220℃水热反应12h,可控合成了α-Fe2O3纳米材料．通过控制C4H4O6Na2的加入量可控合成了纳米球、纳米棒和纳米带等纳米结构单元．采用x射线衍射仪和扫描电镜对产物进行表征．结果表明,在140--220℃反应得到的产物纯净,没有任何杂质峰,均为菱方相结构． 相似文献
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采用常压固定床反应器,考察了负载型Co基系列催化剂的焙烧温度、钴含量以及还原温度对甲烷二氧化碳重整过程的影响;筛选出适宜的工艺条件。结果表明,7%Co/BaTiO3催化剂在反应温度为700℃,压力为0.1 MPa,nCO2∶nCH4为1∶1,气相空速GHSV为12 000 h-1的条件下表现出相对良好的催化活性,可得到87.68%的CH4转化率、75.37%的CO选择性和68.31%的H2收率。 相似文献
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席彩萍 《渭南师范学院学报》2012,(6):37-39
采用等离子体增强化学气相沉积技术,以C2H2、H2和N2为反应气体,制备出碳纳米管薄膜．利用扫描电镜和拉曼光谱仪对其进行表征．结果表明：气体流量大小对碳纳米管薄膜的生长起着重要作用,获得定向性良好、分布均匀、密度适中的碳纳米管的合适比例是C2H2：H2：N2=30：30：10（seem）． 相似文献
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ZHANG Jia-yuan ZHOU Jie-min 《重庆大学学报(英文版)》2007,6(3):155-160
Steam-reforming is an effective approach for upgrading methane and hydrocarbon of coke-oven gas into CO and H2, but the kinetic behavior needs more study. We investigated the conversion of methane in coke-oven gas by steam reforming process in an electric tubular flow at 14 kPa with temperature varying from 500 °C to 950 °C, and developed a kenetic model for , ignoring the effects of adsorption and diffusion. The optimal dynamic conditions for methane conversion 14 kPa are as follows:the ratio of the amount of water to the amount of methane is from 1.1 to 1.3;the reaction temperature is from 1 223 K to 1 273 K. The methane conversion rate is larger than 95% when the ratio of the amount of water to the amount of methane is 1.2 at a temperature above 1 223 K with the residence time up to 0.75 s. 相似文献
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Experiment and mechanism investigation on advanced reburning for NOx reduction： influence of CO and temperature 总被引：4，自引：0，他引：4
Wang ZH Zhou JH Zhang YW Lu ZM Fan JR Cen KF 《Journal of Zhejiang University. Science. B》2005,6(3):187-194
Pulverized coal reburning, ammonia injection and advanced reburning in a pilot scale drop tube furnace were investigated. Premix of petroleum gas, air and NH3 were burned in a porous gas burner to generate the needed flue gas. Four kinds of pulverized coal were fed as reburning fuel at constant rate of 1g/min. The coal reburning process parameters including 15%～25% reburn heat input, temperature range from 1100 ℃ to 1400 ℃ and also the carbon in fly ash, coal fineness, reburn zone stoichiometric ratio, etc. were investigated. On the condition of 25% reburn heat input, maximum of 47% NO reduction with Yanzhou coal was obtained by pure coal reburning. Optimal temperature for reburning is about 1300 ℃ and fuel-rich stoichiometric ratio is essential; coal fineness can slightly enhance the reburning ability. The temperature window for ammonia injection is about 700 ℃～1100 ℃. CO can improve the NH3 ability at lower temperature. During advanced reburning, 72.9% NO reduction was measured. To achieve more than 70% NO reduction, Selective Non-catalytic NOx Reduction (SNCR) should need NH3/NO stoichiometric ratio larger than 5, while advanced reburning only uses common dose of ammonia as in conventional SNCR technology. Mechanism study shows the oxidization of CO can improve the decomposition of H2O, which will rich the radical pools igniting the whole reactions at lower temperatures. 相似文献