摘要 |
In the catalytic hydrotreating of pyrolysis gasoline, the major portion of dienes present in the hydrotreated product concentrate in the C5 fraction. The C5 fraction is separated from a first portion of the hydrotreated effluent and a portion of said separated C5 fraction is combined with a second portion of the hydrotreated effluent as a combined recycle stream to the hydrotreating reaction. By combining a portion of the separated C5 fraction with the recycle hydrotreated effluent, the net C5 product recovered from the process has a diene value which is lower than that which would be obtained without the C5 recycle.
|