Patent ID: 6407300
Filing Date: 2002-06-18
Classification: B01D,C07C,Y02P,Y10S

Abstract:
A process for the hydrogenation of olefins, diolefins and acetylenes in a hydrocarbon stream comprising the steps of:feeding hydrogen and a stream comprising a mixture of hydrocarbons having a range of carbon numbers containing olefins, diolefins and acetylene to a first distillation column reactor below a first primary bed and first secondary bed of hydrogenation catalyst wherein a first hydrocarbon having a carbon number less than the highest carbon number in said range is boiled upward into said first primary bed along with the hydrocarbons having a lower carbon number than said first hydrocarbon, said first hydrocarbon being concentrated in said first primary bed and designated the first key component; hydrogenating substantially all of the diolefins and acetylenes contained within said first key component to monoolefins in said first primary bed and a portion of the diolefins and acetylenes contained within the hydrocarbons having a lower carbon number than said first key component to produce a diolefin depleted stream containing olefins; hydrogenating substantially all of the remainder of the olefins and acetylenes contained within said hydrocarbons having a lower carbon number than said first hydrocarbon to monoolefins in said first secondary bed; separating hydrocarbons having carbon numbers higher than said first key component from the diolefin and acetylene depleted stream containing the first key component and hydrocarbons having a lower carbon number than said key component; feeding the diolefin and acetylene depleted stream containing olefins to a second distillation column reactor above a second primary bed and a second secondary bed of hydrogenation catalyst wherein a second hydrocarbon having a carbon number higher than said first key component is concentrated within said second primary bed while said first key component is concentrated below said second primary bed, said secondary hydrocarbon being designated the second key component; feeding hydrogen to said second distillation column reactor below the second secondary bed of hydrogenation catalyst; and hydrogenating substantially all of the olefins contained within said second key component and a portion of the olefins contained within the first key components to alkanes within said second primary bed; and hydrogenating substantially all of the remaining olefins contained within said first key component to alkanes within said second secondary bed.