SHANGHAI (AFX-ASIA) – China Petrochemical Corp (Sinopec Group), the country’s largest refiner, plans to export 60,000 tons of diesel oil in September, 11.76 pct lower than the 68,000 tons exported in August, due to a gradual pick-up in domestic demand, a trader with China International United Petroleum & Chemical Co (Unipec) said. Vietnam was the…