Process for Hydroprocessing of Biological Feedstocks
AssigneeAxens
InventorDominic Debonis
Life of this patent
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Abstract
The invention relates to an improved apparatus and methods for managing and utilizing light hydrocarbons utilized and created during the hydroprocessing of biological feedstocks in the making of middle distillate fuels.
Claims64
A process for efficiently and effectively utilizing light ends streams in conjunction with the hydroprocessing of biological feedstocks comprising:
- a) feeding a pretreated biological feedstock and a hydrogen stream to a hydroprocessing zone that utilizes at least one solid catalyst to catalyze hydrotreatment reactions and produce a hydroprocessing liquid effluent;
- b) feeding said hydroprocessing liquid effluent and a light hydrocarbon stripping medium to a light ends recovery zone wherein said light hydrocarbon stripping medium is contacted with said hydroprocessing liquid effluent to create a recovered light ends stream and a gas stripped liquid effluent stream;
- and
- c) feeding said recovered light ends stream to a hydrogen production zone wherein said hydrogen production zone utilizes the hydrocarbons in said recovered light ends stream as feedstock to create at least a portion of said hydrogen stream utilized in step (a).
A process for efficiently and effectively utilizing light ends streams in conjunction with the hydroprocessing of biological feedstocks to middle distillate hydrocarbon fuels comprising:
- a) feeding a pretreated biological feedstock and a hydrogen stream to a hydroprocessing zone that utilizes a solid catalyst to catalyze hydrotreatment reactions and produce a hydroprocessing liquid effluent;
- b) feeding said hydroprocessing liquid effluent and a light hydrocarbon stripping medium to the light ends recovery zone wherein said light hydrocarbon stripping medium is contacted with said hydroprocessing liquid effluent to create a recovered light ends stream and a stripped liquid effluent stream;
- c) feeding said recovered light ends stream to a light ends separation zone to create an LPG stream and a light residual gas stream;
- and
- d) feeding said light residual gas stream to a hydrogen production zone wherein said hydrogen production zone utilizes the hydrocarbons in said residual gas stream as feedstock to create at least a portion of said hydrogen stream utilized in step (a).
A process for efficiently and effectively utilizing light ends streams in conjunction with the hydroprocessing of biological feedstocks comprising:
- a) feeding a pretreated biological feedstock and a hydrogen stream to a hydroprocessing zone that utilizes at least one solid catalyst to catalyze hydrotreatment reactions and produce a hydroprocessing liquid effluent;
- b) feeding said hydroprocessing liquid effluent and a light hydrocarbon stripping medium to a light ends recovery zone wherein said light hydrocarbon stripping medium is contacted with said hydroprocessing liquid effluent to create a recovered light ends stream and a gas stripped liquid effluent stream;
- c) feeding said gas stripped liquid effluent stream to a secondary hydroprocessing zone that utilizes at least one secondary solid catalyst to catalyze additional hydroprocessing reactions to produce a secondary hydroprocessing liquid effluent;
- d) feeding said recovered light ends stream to a hydrogen production zone wherein said hydrogen production zone utilizes the hydrocarbons in said recovered light ends stream as feedstock to create a hydrogen rich vapor effluent stream;
- e) feeding said hydrogen rich vapor effluent stream to said secondary hydroprocessing zone;
- and
- wherein excess hydrogen from said secondary hydroprocessing zone is thereafter cascaded to said hydroprocessing zone.
Dependencies are inferred from the claim text.