公开(公告)号：US11701612B2

公开(公告)日：2023-07-18

申请号：US15734803

申请日：2019-06-14

申请人： SYSADVANCE—SISTEMAS DE ENGENHARIA S.A.

发明人： Patrick Da Silva Barcia ,  Daniel Antonio Santos Silva Ferreira ,  Silvio Daniel Da Silva Carvalho Monteiro

IPC分类号： B01D53/047 ,  B01D51/10 ,  B01D53/00 ,  C07C7/13

CPC分类号： B01D53/0476 ,  B01D51/10 ,  B01D53/002 ,  C07C7/13 ,  B01D2253/102 ,  B01D2253/116 ,  B01D2253/306 ,  B01D2253/308 ,  B01D2256/245 ,  B01D2257/102 ,  B01D2257/104 ,  B01D2257/304 ,  B01D2257/504 ,  B01D2257/80 ,  B01D2258/05 ,  B01D2259/4062 ,  B01D2259/40075 ,  B01D2259/40079 ,  B01D2259/40081 ,  B01D2259/41 ,  B01D2259/414

摘要： A multi-stage process to remove contaminant gases from raw methane streams is provided. The present technology is an innovative solution to recover and purify biogas by use of a process having at least two pressure swing adsorption stages. Taking advantage of the presence of carbon dioxide in the raw biogas streams, nitrogen and oxygen are bulky removed in the first stage, using selective adsorbents, and a nitrogen and oxygen-depleted intermediate stream is yielded to the second stage. The second stage employs an adsorbent or adsorbents to selectively remove carbon dioxide and trace amounts of remaining nitrogen and oxygen, thus producing a purer methane stream that meets pipeline and natural gas specifications.