US 12,138,616 B2
Microporous carbon materials to separate nitrogen in associated and non-associated natural gas streams
Federico Jesus Jimenez Cruz, Mexico City (MX); Jose Luis Garcia Gutierrez, Mexico City (MX); Jose Francisco Gaspar Silva Sanchez, Mexico City (MX); Liliana Alejandra Astudillo Lopez Lena, Mexico City (MX); Fidencio Hernandez Perez, Mexico City (MX); Alberto Cabrales Torres, Mexico City (MX); Maria Del Carmen Martinez Guerrero, Mexico City (MX); Marco Antonio Dominguez Aguilar, Mexico City (MX); Arturo Trejo Rodriguez, Mexico City (MX); and Florentino Rafael Murrieta Guevara, Mexico City (MX)
Assigned to Instituto Mexicano del Petróleo, Mexico City (MX)
Filed by Instituto Mexicano del Petróleo, Mexico City (MX)
Filed on Jan. 25, 2024, as Appl. No. 18/423,010.
Application 17/350,468 is a division of application No. 16/146,502, filed on Sep. 28, 2018, granted, now 11,059,027, issued on Jul. 13, 2021.
Application 18/423,010 is a continuation of application No. 17/350,468, filed on Jun. 17, 2021, granted, now 11,896,954.
Claims priority of application No. MX/A/2017/012563 (MX), filed on Sep. 29, 2017.
Prior Publication US 2024/0165587 A1, May 23, 2024
Int. Cl. B01J 20/285 (2006.01); B01D 53/02 (2006.01); B01J 20/20 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01)
CPC B01J 20/285 (2013.01) [B01D 53/02 (2013.01); B01D 53/025 (2013.01); B01J 20/20 (2013.01); B01J 20/28021 (2013.01); B01J 20/2808 (2013.01); B01J 20/3078 (2013.01); B01J 20/3085 (2013.01); B01D 2253/102 (2013.01); B01D 2256/10 (2013.01); B01D 2257/304 (2013.01); B01D 2257/504 (2013.01); B01D 2257/7025 (2013.01)] 6 Claims
 
1. A method of using a microporous carbon material, wherein said method comprises:
separating and desorbing mixtures of nitrogen with hydrocarbons C1, C2, C3 and C4+, with adsorption of the latter using adsorption conditions in a temperature range of 20° C. to 45° C. and with a pressure range of 2 kg/cm2 to 15 kg/cm2,
wherein the desorption conditions are in a temperature range of 135° C. to 250° C. and at reduced pressure to atmospheric pressure, and
wherein the microporous carbon material is in the form of a microsphere,
wherein the microporous carbon material is prepared from the pyrolysis of an alkaline pre-treated material,
wherein the pre-treated material comprises copolymers of polyvinylidene chloride chemically treated with alkali or alkaline earth metal hydroxides or alkoxides,
wherein the pre-treated material comprises an inner layer having carbon in a percentage range of 30% to 65% by mass, oxygen in a percentage range of 2% to 6% by mass, and chlorine in a percentage range of 30% to 60% by mass, and
wherein the microporous carbon material comprises a layer having carbon in a percentage range of 90% to 100% by mass, and oxygen in a percentage range of 10% to 0% by mass.