US 11,807,789 B2
Method of inhibiting carbon dioxide hydrate formation
Abdullah S. Sultan, Dhahran (SA); Tinku Saikia, Dhahran (SA); and Jaber Al Jaberi, Dhahran (SA)
Assigned to King Fahd University of Petroleum and Minerals, Dhahran (SA)
Filed by King Fahd University of Petroleum and Minerals, Dhahran (SA)
Filed on Mar. 25, 2022, as Appl. No. 17/704,339.
Prior Publication US 2023/0303920 A1, Sep. 28, 2023
Int. Cl. E21B 41/06 (2006.01); C09K 11/07 (2006.01); C07C 29/76 (2006.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01); B82Y 20/00 (2011.01); E21B 41/00 (2006.01)
CPC C09K 11/07 (2013.01) [C07C 29/76 (2013.01); E21B 41/0064 (2013.01); B82Y 20/00 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C09K 2211/10 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of inhibiting carbon dioxide (CO2) hydrate formation in a CO2 pipeline, comprising:
injecting a composition comprising monoethylene glycol carbon quantum dots (MEG CQDs) into the CO2 pipeline to deposit the MEG CQDs on an inside surface of the CO2 pipeline;
pressurizing the CO2 pipeline with a gas stream containing CO2 and water vapor at a pressure of 200-2,000 pounds per square inch (psi);
wherein the MEG CQDs are present on the inside surface of the CO2 pipeline in an amount effective to reduce the formation of CO2 hydrates in the CO2 pipeline during the pressurizing in comparison to the formation of the CO2 hydrates in the CO2 pipeline under the same conditions but in the absence of the MEG CQDs.