Petrobras sees refinery sale generating market changes
Unasur collapse underscores regional divisions
Shell sells Argentine downstream assets to Raízen
Yara's first quarter profits drop

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Disgraced Odebrecht to fight Mexico sanctions
Petrobras seeks partnerships in divestment drive
Will political turmoil stymie Brazil's oil sector recovery?
Chile approves Arbiodo iodine project
Ecolab aims to triple production in Chile with new plants
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