Effect of montmorillonite on hydrate-based methane separation from mine gas

Three types of mine gas samples were used in the solutions of tetrahydrofuran(THF),sodium dodecyl sulfate(SDS)and THF-SDS with/without MMT respectively to investigate the effect of montmorillonite(MMT)on separation characteristics of methane recovered from mine gas based on hydrate method.The partition coefficient,separation factor and recovery rate were used to evaluate the effects of MMT,and the selection factor was primarily proposed to define the selectivity of mine gas hydrate in the relative target gases.The experimental results indicate that MMT could improve the following factors including hydration separation factor,the selection factor,the partition coefficient,and the recovery rate.Furthermore,the effect of SDS on the function of MMT is analyzed in the process of hydration separation.Finally,due to the results of the experiment,it is concluded that MMT hydration mechanism explores the effect of MMT enrichment methane from mine gas.

苏联卫国战争中的食物购买证政策

1941年德国的入侵加剧了苏联本已存在的粮食危机。为了攻克粮食不足的难关,苏联在后方颁布了食物购买证政策,将城市居民分为四类两等,凭证定量供应粮食。在实践中,该政策受到了粮食供给不足和影子分配的困扰。对此,苏联政府千方百计拓宽供应渠道,不断加强对粮食资源的监管。在联共(布)积极作为、社会各界和外国盟友的竭诚襄助下,购买证政策的运行日益良好,对保证最广泛人民群众的基本生存需求、提高关键部门的劳动生产率都发挥了重要作用,但该政策自带的诸多差异性,也引发了社会非议,有待于农业改革解决。