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乏风瓦斯分离富集用椰壳基活性炭的制备

Preparation of coconut shell-based activated carbon for separation and enrichment of ventilation air methane

    摘要
  • 摘要: 以椰壳为原料、酚醛树脂为粘结剂及聚乙二醇（PEG）为造孔剂和分散剂，采用水蒸气活化制备活性炭，以所制备的活性炭为吸附剂，采用真空变压吸附法（VPSA）对乏风瓦斯进行分离富集.分别考察了不同活化条件对活性炭孔结构性能的影响，以及不同VPSA操作条件对乏风瓦斯富集效果的影响.结果表明：以酚醛树脂与粉体炭的质量比为0.5 g/g制备的成型炭作为炭质前驱体进行活化，在活化时间为5 h、通入水量为1.96 cm3/min和活化温度为825 ℃的条件下制备的活性炭，其对应的比表面积、微孔体积及微孔率分别达到795 m2/g、0.37 cm3/g和84.1%；并以该活性炭为吸附剂，在最佳操作条件下，乏风瓦斯（甲烷含量约0.5%）经富集后，产气中CH4浓度和回收率分别为1.51%和96%.

     

    Abstract: The activated carbon was prepared by steam activation, with coconut shells as the raw material, phenolic resin as the binder and polyethylene glycol (PEG) as the pore-making agent and dispersant. Then it was used as the adsorbent in the separation and enrichment of ventilation air methane (VAM) by vacuum pressure swing adsorption (VPSA). The porous properties of activated carbon under different activation parameters and the efficiency of the enrichment of VAM under different VPSA conditions were systematically investigated. The results showed that the precursor of activated carbon was a molding carbon made of phenolic resin and powdered carbon with the mass ratio of 0.5 g/g. If the activate carbon was prepared under such operation conditions with the activation time of 5 h, the flow rate of water of 1.96 cm3/min and the activation temperature of 825 ℃, its specific surface area, micropore volume and micropore ratio would be 795 m2/g, 0.37 cm3/g and 84.1%, respectively. With such activated carbon as the adsorbent, under the optimum operation conditions, CH4 concentration in the gas production increased from 0.52 vol. % up to 1.51 vol. % and its recovery rate reached about 96% after the enrichment of VAM.

     

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