	US 12,128,382 B1
	Cellulous nanofiber aerogels-based bio unit for sequestering flow back CO2 after hydraulic fracturing operations
Abeer Ateeq Alarawi, Khobar (SA); Sarah Yacob Alaskar, Dhahran (SA); and Murtadha J. AlTammar, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Apr. 26, 2024, as Appl. No. 18/647,271.
Int. Cl. B01D 53/81 (2006.01); B01D 53/22 (2006.01); B01D 53/62 (2006.01); B01J 20/26 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); B01J 20/32 (2006.01)

CPC B01J 20/267 (2013.01) [B01D 53/226 (2013.01); B01D 53/229 (2013.01); B01D 53/62 (2013.01); B01D 53/81 (2013.01); B01J 20/28007 (2013.01); B01J 20/28011 (2013.01); B01J 20/28047 (2013.01); B01J 20/28061 (2013.01); B01J 20/28064 (2013.01); B01J 20/3085 (2013.01); B01J 20/3208 (2013.01); B01J 20/3217 (2013.01); B01J 20/3268 (2013.01); B01D 2253/202 (2013.01); B01D 2253/25 (2013.01); B01D 2253/304 (2013.01); B01D 2253/306 (2013.01); B01D 2253/342 (2013.01); B01D 2257/504 (2013.01)]

4 Claims

1. A method for carbon dioxide (CO₂) sequestration, comprising:

locating a CO₂producing process, wherein the CO₂producing process produces a feed stream;

separating, using a first membrane system, the feed stream into a mixed solid and liquid stream and a first gas stream;

separating, using a second membrane system, the first gas stream to produce a second gas stream and a CO₂rich stream comprising CO₂;

directing the CO₂rich stream to a cellulose nanofiber (CNF) aerogel unit, comprising,

a CNF aerogel, comprising a monolithic structure, wherein the monolithic structure comprises;

an aerogel matrix,

a plurality of crosslinked CNFs, and

a plurality of cellulose nanocrystal acetone (a-CNC) suspension particles,

wherein the plurality of crosslinked CNFs and the plurality of a-CNC suspension particles are dispersed throughout the aerogel matrix; and

adsorbing, using the CNF aerogel unit, the CO₂from the CO₂rich stream.