Brazil's Cosan, the world's largest ethanol and sugar processor, and Royal Dutch Shell are merging their Brazilian operations in a deal valued at $12 billion. Braskem, Latin America's largest petrochemicals producer, is acquiring a 100% stake in Sunoco Chemicals, a division of US-based oil company Sunoco, for $350 million. Brazilian banks are also leading an international acquisitions drive. Federally controlled Banco do Brasil is taking a majority stake in Banco Patagonia, Argentina's fifth-largest private bank. Bradesco last year acquired Banco Ibi's Brazilian operations.