Rapid Dissolution of BaSO₄ by Macropa, an 18-Membered Macrocycle with High Affinity for Ba².

ABSTRACT: Insoluble BaSO₄ scale is a costly and time-consuming problem in the petroleum industry. Clearance of BaSO₄-impeded pipelines requires chelating agents that can efficiently bind Ba²⁺, the largest nonradioactive +2 metal ion. Due to the poor affinity of currently available chelating agents for Ba²⁺, however, the dissolution of BaSO₄ remains inefficient, requiring very basic solutions of ligands. In this study, we investigated three diaza-18-crown-6 macrocycles bearing different pendent arms for the chelation of Ba²⁺ and assessed their potential for dissolving BaSO₄ scale. Remarkably, the bis-picolinate ligand macropa exhibits the highest affinity reported to date for Ba²⁺ at pH 7.4 (log K' = 10.74), formi

SUBMITTER: Thiele NA 

PROVIDER: S-EPMC6560633 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature