hi frnds i hav a small problem with aspen plus...

i have used aspen split n aspen ternary plots to find whether acetic acid, water and vinyl-acetate forms an azeotrope or not? YES!! it forms a heterogeneous azeotrope at 66deg but wen i replaced vinyl-acetate with allyl-acetate ( being on of the entrainer in acetic acid dehydration process) n checked for azeotropes... IT IS NOT FORMING ANY? can any body give me the solution? wether i am gettin correct results or any mistake i hav done?? i am using aspen plus v11.1...pl do give suggestions

and also on seperating allyl-acetate and water into 2 layers (like vinyl-acetate and water) on desity basis in a decanter?