BEIJING (AFX-ASIA) – China Petroleum & Chemical Corp (Sinopec) (SHA 600028; HK 0386; NYSE SNP) plans to raise annual production capacity at its Maoming ethylene plant to 800,000 tons from the current 380,000 tons by 2006, the company’s chief financial officer Zhang Jiaren said. He said in a media teleconference that the company would include…