神府丝炭制备分离CH_4/N_2的炭分子筛工艺及其性能研究  

Preparation of formed carbon molecular sieve from fusain of Shenfu coal for separation of CH_4/N_2 and its performance

作　　者：王德超[1] 杨志远[1] 刘娇萍[1] 廖宏斌[1] 杨根源[1] 

机构地区：[1]西安科技大学化学与化工学院,陕西西安710054

出　　处：《现代化工》2016年第7期82-86,共5页Modern Chemical Industry

基　　金：国家重大专项(2011ZX05037-003)

摘　　要：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。Using fusain of Shenfu coal as raw material,the formed carbon molecular sieve（ FCMS） for the separation of CH_4 and N_2 is prepared by carbonization-KOH chemical activation-benzene vapor carbon deposition technology. The optimal activation conditions are：3 of mass ratio of potassium hydroxide and fusain,700℃ of activation temperature and 90 minutes of activation time. The optimal conditions of carbon deposition process are 800℃ of deposition temperature,5 minutes of deposition time and 3 m L / min of benzene flow rate. Under optimal experimental condition,the iodine sorption value and SBETare 985. 23 mg / g and 1 195. 52 m2/ g,respectively. The micropore volumes is 63. 18%. CH_4 and N_2 adsorption capacity are performed on FCMS and the adsorption data is fitted by Langmuir model. The results indicate that CH_4 is the strong adsorbed component and the separation factor is 2. 50. Breakthrough experiment results show that the breakthrough time of CH_4 is delayed by 171 s. It surggests that the adsorption capacity of CH_4 on FCMS is strengthened.

关 键 词：炭分子筛 变压吸附 CH_4/N_2分离 穿透实验 分离系数 

分 类 号：TQ53[化学工程—煤化学工程]