US 12,416,570 B2
Measurement of iron in glycol and amine in natural gas processing
Mohamed Ahmed Saad Mahmoud, Dammam (SA); Ahmed Hamad Salman, Riyadh (SA); and Hassan Yahiya Al-Malki, Dammam (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Mar. 29, 2023, as Appl. No. 18/192,358.
Prior Publication US 2024/0328934 A1, Oct. 3, 2024
Int. Cl. B01D 53/14 (2006.01); B01D 53/26 (2006.01); B01D 53/28 (2006.01); C10L 3/10 (2006.01); G01N 21/33 (2006.01)
CPC G01N 21/33 (2013.01) [B01D 53/1406 (2013.01); B01D 53/1462 (2013.01); B01D 53/1493 (2013.01); B01D 53/263 (2013.01); B01D 53/28 (2013.01); C10L 3/103 (2013.01); C10L 3/104 (2013.01); B01D 2252/2026 (2013.01); B01D 2252/204 (2013.01); B01D 2257/304 (2013.01); B01D 2257/504 (2013.01); B01D 2257/80 (2013.01); C10L 2290/545 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of operating a natural gas processing plant, comprising:
receiving feed natural gas;
removing acid gas from the feed natural gas via a gas sweetening unit comprising an amine absorber column that absorbs the acid gas from the feed natural gas into amine comprising liquid amine to remove the acid gas from the feed natural gas;
collecting an amine sample of the amine in the gas sweetening unit;
removing water from the feed natural gas via a natural gas dehydration system comprising a column vessel that contacts the feed natural gas with liquid desiccant comprising glycol to remove the water from the feed natural gas;
collecting a glycol sample of the glycol in the natural gas dehydration system;
adding reagent water and ferrozine to each of the amine sample and the glycol sample; and
measuring total dissolved iron via ultraviolet-visible (UV-Vis) spectrophotometry in each of the amine sample and the glycol sample.