Patent ID: 11859138
Assignee: EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANY
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC C

Claim 18:
19. A method for performing hydrodeoxygenation, comprising:
stripping a first amine-containing flow comprising a first molar ratio of H2S to amine of 0.25 or more with a stripping gas comprising 80 vol % or more of H2 in a vessel to form an amine-containing flow comprising a second molar ratio of H2S to amine that is lower than the first molar ratio and a sulfidation gas phase fraction comprising 80 vol % or more H2 and 1.0 vol % or more of H2S;
exposing a hydroprocessing catalyst to sulfidation treat gas comprising at least a portion of the sulfidation gas phase fraction under sulfidation conditions to form a sulfided hydroprocessing catalyst;
stripping a second amine-containing flow comprising a third molar ratio of H2S to amine of 0.25 or more with a stripping gas comprising 80 vol % or more of H2 in a vessel to form an amine-containing flow comprising a fourth molar ratio of H2S to amine that is lower than the third molar ratio and a gas phase fraction comprising 80 vol % or more H2 and 50 vppm or more of H2S;
exposing, within a hydroprocessing reactor, a feedstock comprising at least a fresh feed portion to the sulfided hydroproces sing catalyst and a treat gas comprising at least a portion of the gas phase fraction under hydrodeoxygenation conditions to form a liquid product effluent comprising 0.5 wt % or less of oxygen and a gas product effluent comprising 200 vppm or more of H2S, the fresh feed portion comprising 1000 wppm or less of sulfur and 1.0 wt % or more of oxygen, the hydrodeoxygenation conditions comprising a flow of treat gas relative to a flow rate of the fresh feed of 5000 SCF/bbl or higher (˜1350 Nm3/m3), wherein the fresh feed portion corresponds to feedstock that has not been recycled from downstream of the hydroprocessing reactor.