Ethylene → Ethylene

According to the present invention, the reactor effluent from the oxygenate conversion process of Example I, Run A, at 435° C. is passed to a separation zone consisting of COx removal zone and a H2O separation zone to remove water and provide a hydrocarbon effluent. The hydrocarbon effluent is passed to a demethanizer to remove methane as an overhead stream and provide a demethanizer bottoms stream. The demethanizer bottoms consist of 50.3 equivalents of ethylene, 33.5 equivalents of propylene and 9.0 equivalents of butenes. The demethanizer bottoms stream is combined with a recycle stream from the propylene metathesis reactor consisting of 2.4 equivalents of ethylene, 27.1 equivalents of propylene and 4.0 equivalents of butenes to provide a combined stream to an ethane-ethylene column with 52.7 equivalents of ethylene, 60.6 equivalents propylene and 13.0 equivalents butenes. In the ethane-ethylene column the 52.7 equivalents of ethylene and 0.6 equivalents of ethane are separated overhead and C3+ fraction is recovered. The C3+ stream is passed to a propane-propylene (P-P) column wherein 13.0 equivalents of butenes and 2.0 equivalents of C5+ products are recovered as P-P bottoms. The overhead of the propane-propylene column, consisting of 60.6 equivalents of propylene is divided into two portions; 33.5 equivalents of propylene are passed to a propylene metathesis reactor while 27.1 equivalents of propylene are recovered as a propylene product. The propylene metathesis reactor is operated as described in Example 3 of U.S. Pat. No. 3,723,562 wherein the propylene conversion was 19% with a 37.6% selectivity to ethylene and a 62.4% selectivity to butenes. The entire effluent of this reactor is combined with the demethanizer bottoms as the recycle stream described above.

1. customto remove methane as an overhead stream
2. customprovide a demethanizer

ORD record

ord-f6dd47ec4d12445faafe03a6d80a092f

Source dataset

uspto-grants-1999_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05990369