Patent ID: 8586811
Filing Date: 2013-11-19
Classification: B01J,C07C,C10G

Abstract:
1. A process for preparing mono-olefins in a hydrocarbon processing apparatus, said method comprising the steps of: separating a hydrocarbon feed into a first fraction of carbon-containing compounds having less than or equal to 5 carbon atoms and a second fraction containing compounds having a lower vapor pressure than those in the first fraction in a fractionation stage of the hydrocarbon processing apparatus; selectively hydrogenating dienes and/or acetylenes from the first fraction into corresponding mono-olefins in a selective hydrogenation stage of the hydrocarbon processing apparatus to form a selective hydrogenation stream; dehydrogenating paraffins contained in the selective hydrogenation stream into corresponding mono-olefins to form a dehydrogenation stream within a conversion stage of the hydrocarbon processing apparatus; contact cooling the dehydrogenation stream with an impurity-containing liquid hydrocarbon stream in a contact cooling stage of the hydrocarbon processing apparatus to form a cooled dehydrogenation stream containing impurities having a lower vapor pressure than compounds in the first fraction, wherein the impurities include sulfur-, mercury-, arsenic-, nitrogen-, and/or oxygen-containing compounds; separating the cooled dehydrogenation stream into a mono-olefin fraction and a paraffin-containing fraction in a mono-olefin separation stage, wherein the paraffin-containing fraction comprises said impurities and wherein the paraffin-containing fraction is recycled to the step of separating the hydrocarbon feed in the fractionation stage; wherein the dienes and/or acetylenes from the first fraction are selectively hydrogenated prior to converting the paraffins from the first fraction into mono-olefins and after separating the first fraction from the hydrocarbon feed.