Microporous carbon materials to separate nitrogen in associated and non-associated natural gas streams

The present invention relates to a process for the manufacture of microporous carbon materials to perform selective separations of nitrogen in gas mixtures such as hydrogen sulfide, carbon dioxide, methane and C2, C3 and C4+ hydrocarbons, with high efficiency, shaped of microspheres or cylinders from copolymers of poly (vinylidene chloride-co-methyl acrylate) with density of 1.3 to 1.85 g/cm3 or poly (vinylidene chloride-co-vinyl chloride) with density of 1.3 to 1.85 g/cm3, using two stages. In the first stage, the surface of a material is passivated through chemical corrosion by soaking the material in a highly alkaline alcohol solution so as to pre-carbonize the copolymer surface, thus during the pyrolysis process, the deformation of the material is avoided, micro pores are formed gradually; in the second stage, the chemically passivated copolymer is gradually thermally decomposed so as to form micro pores and obtain a large surface area; and the provided method can avoid material deformation during the mel