JEDDAH: Saudi ethylene and propylene capacities will rise to 16.52 million tpa and 6.55 million tpa respectively, with Saudi Kayan's commercial operation in 2011 set to contribute most to the increase, Business Monitor International's "Saudi Arabia Petrochemicals Report Q3 2011" said Friday. Compared with 2010, total PE capacity will rise 20 percent to 8.86 million tpa, PP will rise 11 percent and PS, PET and PVC capacities will remain unchanged. In BMI's Middle Eastern Petrochemicals Business Environment Ratings, Saudi Arabia is rated as the most attractive country out of the 11 surveyed by some margin, with a score of 76.3 points, up 1.3 points.