US 12,441,931 B2
Sulfonation method for efficient scale-up synthesis of janus carbon nanomaterials from biomass waste
Ayrat Gizzatov, Winchester, MA (US); Wei Wang, Quincy, MA (US); and Sehoon Chang, Boston, MA (US)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by ARAMCO SERVICES COMPANY, Houston, TX (US)
Filed on Mar. 14, 2024, as Appl. No. 18/605,552.
Prior Publication US 2025/0289993 A1, Sep. 18, 2025
Int. Cl. C09K 8/584 (2006.01); C01B 32/05 (2017.01); E21B 43/16 (2006.01)
CPC C09K 8/584 (2013.01) [C01B 32/05 (2017.08); E21B 43/16 (2013.01); C01P 2002/82 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2004/64 (2013.01); C09K 2208/10 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of preparing an enhanced oil recovery composition comprising:
carbonizing a biomass waste material to provide carbon microparticles;
functionalizing the carbon microparticles with a SO3-containing gas such that the carbon microparticles comprise a hydrophilic surface; and
grinding the functionalized carbon microparticles to provide carbon nanoparticles, wherein the carbon nanoparticles comprise a hydrophilic surface and a hydrophobic surface.