| 摘要 |
A process for preparing an ethylene-rich composition from a C<SB>3-5</SB> paraffinic feedstock is described. The C<SB>3-5</SB> paraffinic feedstock is subjected to molecular redistribution via dehydrogenation to form olefins, metathesis of the olefins, and rehydrogenation of the olefins to form paraffins. The product stream includes ethane, which is isolated and sent to an ethane or ethane/propane cracker (or, alternatively, a flexi-cracker, although this is less cost effective) to yield an ethylene-rich composition. The product stream also includes C<SB>3-5</SB> paraffins, which can be recycled, and C<SB>6</SB>+ paraffins, which can be used, for example, as solvents. Alternatively, they C<SB>6</SB>+ paraffins can be isomerized to form gasoline additives, or can be converted to aromatic compounds by subjecting them to reforming conditions, for example by using the AROMAX õ process or platforming or rheniforming conditions. |
