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以神府煤丝炭(SFF)为原料,采用炭化-KOH活化-苯气相碳沉积方法制备用于变压吸附分离CH_4/N_2所用的成型炭分子筛(FCMS),活化过程的最优条件为:碱炭质量比=3∶1,活化温度为700℃,活化时间为90 min;碳沉积过程最优条件为:碳沉积温度为800℃,碳沉积时间为5 min,苯流率为3 m L/min,在此条件下,FCMS的碘吸附值和比表面积分别为985.23 mg/g和1 195.52 m2/g,微孔孔容占63.18%。利用FCMS进行了CH_4和N_2吸附量测试和Langmuir吸附模型的拟合,得出CH_4为强吸附组分,CH_4/N_2在FCMS上的分离系数为2.50。单塔穿透实验表明,CH_4在FCMS上的穿透时间延迟了171 s,证实了FCMS吸附甲烷的能力增强。
The optimum conditions for the activation process of the formed carbon molecular sieve (FCMS) used for the pressure swing adsorption separation of CH 4 / N 2 were as follows: using Shenfu coal smelter (SFF) as raw material and carbonization-KOH activated-benzene vapor phase carbon deposition The mass ratio of alkali to carbon is 3:1, the activation temperature is 700 ℃ and the activation time is 90 min. The optimal conditions of carbon deposition are as follows: the carbon deposition temperature is 800 ℃, the carbon deposition time is 5 min, the flow rate of benzene is 3 m L / min. Under these conditions, the iodine adsorption value and specific surface area of FCMS were 985.23 mg / g and 1 195.52 m2 / g, respectively. The microporous pore volume accounted for 63.18%. The adsorption of CH_4 and N_2 and the fitting of Langmuir adsorption model were obtained by FCMS. The results showed that CH_4 was a strong adsorbent and the separation coefficient of CH_4 / N_2 on FCMS was 2.50. Single column penetration experiments showed that the breakthrough time of CH_4 on FCMS was delayed by 171 s, confirming the enhanced ability of FCMS to adsorb methane.