共查询到19条相似文献,搜索用时 92 毫秒
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向煤气化炉中喷入石灰石或氧化钙粉是脱除煤气中含硫化合物最简便的方法之一。文中采用热重分析仪在常压(绝压为0.1 MPa)下对石灰石和氧化钙分别脱除H2S和COS的反应进行了动力学研究。实验条件为:温度1 025—1 450 K、H2S和COS的分压范围0.000 3—0.001 5 MPa、颗粒粒径为0.84—1.0 mm。结果表明,石灰石和氧化钙与H2S和COS的反应均表现为一级反应;与CaCO脱除H2S和COS的反应相比,CaO3脱除H2S和COS反应的初速率几乎快10倍。在0.105—1.0 mm粒径范围内的实验表明,CaO脱除H2S和COS的反应与颗粒粒度成反比关系。 相似文献
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刘壬川 《化工催化剂及甲醇技术》2007,(1):22-25
目前气体脱硫除防止催化剂中毒外,同时是为了保护人类生存的环境。由于活性炭本身具有一些特殊结构和性能,其最大特点是有发达的孔隙结构、很大的比表面积和吸附能力。如木炭的比表面积一般只有100-400m^2/g,而活性炭对气体、溶液中的有机或无机物质以及胶体颗粒等都有很强的吸附能力。[第一段] 相似文献
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该文在实验室条件下对不同活性炭精脱H_2S(出口H_2S≤0.05mgS/m~3)和脱除COS性能进行了考察。文章对其实验方法进行了叙述;对精脱H_2S工作硫容的对比等问题进行了讨论;最后还对三个问题作了结论。 相似文献
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煅烧条件下石灰石脱除煤气中H2S的研究 总被引:1,自引:0,他引:1
在加压流化床中测定了系统总压、水蒸气和CO2分压对CaO与H2S反应的影响。实验结果表明,在H2S分压不变的情况下,硫化反应速率随着总压的提高而减小;只有CaO硫化反应时,气相中水蒸气促进CaS产物层的熔合,阻碍硫化反应的进行;但当CaCO3煅烧反应同时进行时,水蒸气对硫化反应没有影响;CaCO3煅烧反应总是快于CaO硫化反应,CO2的不断逸出对硫化反应有促进作用。 相似文献
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食品级CO2的分析标准提高,原来的分析方法不能适应工艺要求。介绍了一种新的能分析H2S、COS等单组分、精度高、灵敏度高的分析方法——气相色谱法。该方法分析速度快,分离效果好。 相似文献
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阐述了甲醇生产中NHD法脱硫脱碳的技术进展,脱硫工序针对原料气含硫量不同,分别采用三塔流程配两级闪蒸和二塔流程配两级闪蒸,脱碳工序采取设计节能流程工艺、新型常解气提塔及改变气提方式等措施。实践证明,NHD工艺用于甲醇生产,更具高效节能的特点。 相似文献
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《分离科学与技术》2012,47(12):2806-2826
Abstract Colloidal particles of CaO were synthesized by the sol-gel method. The particle morphology was characterized by FT-IR, TGA, DTA, and TEM analysis. The ability of the CaO nanoparticles for removal of fluoride from aqueous solution through adsorption has been investigated. All the experiments were carried out by batch mode. The effect of various parameters viz. contact time, pH effect (pH 2–10), adsorbent dose (0.01–0.1 g/100 ml), initial fluoride concentration (10–100 mg/l) and competitive ions has been investigated to determine the adsorption capacity of CaO nanoparticles. Almost complete removal (98%) of fluoride was obtained within 30 minutes at an optimum adsorbent dose of 0.6 g/L for initial fluoride concentration of 100 mg/L. The adsorption isotherm was also studied to find the nature of adsorbate-adsorbent interaction. 相似文献
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TiO2光催化消除H2S的研究 总被引:2,自引:0,他引:2
在TiO2上进行了气相H2S光催化氧化消除的研究.氧对H2S的光催化氧化消除过程是不可缺少的,对含量为560mg/m^3的H2S,,当加入的氧气与原料气中H2S的分子比为42:1,空速为28000h^-1时,去除率达到97%.在HiS光催化氧化消除过程中,单质硫的产生可使TiO2失活,经光照再生单质硫转化为SO4^2-后,TiO2活性恢复,而且SO4^2-的生成对催化剂的中毒有抑制作用. 相似文献
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A novel technology of removing H2S with cupric chloride solution was developed in this paper. Cupric as the form of CuS deposition, the CuS produced was then oxidized by excessive cupric ion in another reactor meanwhile cupric ion that has been consumed can be recovered by the oxidization of CuCl2- with oxygen in air,and the solution can be circulated. Moreover, the leaching kinetics of CuS by cupric ion was studied. The removal efficiency of H2S is close to 100%, and the required operating condition is mild. Compared with other wet oxidization methods, no raw material is consumed except O2 in air, the process has no secondary pollution and no problem of degradation and scale, and the absorbent is much stable and reliable. 相似文献