	US 11,926,544 B1
	Biological desulfurizer for removing organic sulfur in fracturing flowback fluid and application thereof
Xiaoqing Qiu, Zhengzhou (CN); Xiang Wang, Zhengzhou (CN); Guisheng Wang, Zhengzhou (CN); Guofeng Li, Zhengzhou (CN); Jiawei Zhang, Zhengzhou (CN); Lei Song, Zhengzhou (CN); Xia Wang, Zhengzhou (CN); Qianli Xu, Zhengzhou (CN); and Puyan Hou, Zhengzhou (CN)
Assigned to CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and CHINA PETROLEUM & CHEMICAL CO., LTD. OF NORTH BRANCH, Zhengzhou (CN)
Filed by CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and CHINA PETROLEUM & CHEMICAL CO., LTD. OF NORTH BRANCH, Zhengzhou (CN)
Filed on Oct. 16, 2023, as Appl. No. 18/487,134.
Claims priority of application No. 202211319147.8 (CN), filed on Oct. 26, 2022.
Int. Cl. C02F 1/68 (2023.01); C02F 101/10 (2006.01); C02F 103/10 (2006.01); C08B 37/08 (2006.01)

CPC C02F 1/68 (2013.01) [C08B 37/003 (2013.01); C02F 2101/101 (2013.01); C02F 2101/40 (2013.01); C02F 2103/10 (2013.01); C02F 2303/02 (2013.01)]

9 Claims

1. A biological desulfurizer for removing organic sulfur in fracturing flowback fluid, comprising a compound with a triazine structure formed by modifying chitosan with aldehydes and inorganic salts;

the preparation method of the biological desulfurizer includes the following steps:

(1) preparing a chitosan solution;

(2) adding aldehyde to the chitosan solution, adjusting the pH to 9-10, and quickly stirring at room temperature to obtain a reaction solution;

(3) adding inorganic salts to the reaction solution, heating and stirring for 5-8 h to obtain a mixed solution;

(4) steaming out the solvent in the mixed liquid under reduced pressure to obtain the biological desulfurizer.