The chemicals arm of Malaysian state energy firm Petronas debuted at a 9.8 percent premium of 5.71 ringgit (1.82 dollars) in its initial public offering Friday. The Petronas Chemicals Group offering is Southeast Asia's biggest ever listing, eclipsing the 3.3 billion dollar IPO of Malaysian mobile operator Maxis a year ago. The result was at the top end of analysts' forecasts for the offering which had a list price of 5.20 ringgit, and reflects strong demand for regional IPOs including AIA, which launched on the Hong Kong bourse earlier this month. Petronas' petrochemicals business includes 22 companies that produce chemical compounds, fertilisers, and industrial and specialty chemicals. 