METHODS FOR HYDROGEN SULFIDE RECYCLING USING SELECTIVE SOLVENTS IN THE HYDROPROCESSING OF RENEWABLE FEEDSTOCKS

摘要

Methods for hydrogen sulfide recycling using selective solvents in the hydroprocessing of renewable feedstocks are provided. An exemplary method includes the steps of combining hydrogen sulfide with renewable hydrocarbon feedstocks to form a first stream, deoxygenating the first stream to form a second hydrocarbon stream comprising deoxygenated hydrocarbons, water, carbon dioxide, and hydrogen sulfide, and separating the carbon dioxide and the hydrogen sulfide from the second hydrocarbon stream to form a third recycle stream comprising carbon dioxide and hydrogen sulfide. The method further includes the steps of selectively scrubbing the hydrogen sulfide from the third recycle stream to form a fourth recycle stream comprising carbon dioxide and a fifth recycle stream comprising hydrogen sulfide and selectively scrubbing the carbon dioxide from the fourth recycle stream.

主权项

1. A method for hydrogen sulfide recycling using selective solvents in the hydroprocessing of renewable feedstocks comprising the steps of:
combining hydrogen sulfide with hydrogen-rich recycle gas and renewable hydrocarbon feedstocks to form a first stream; deoxygenating the first stream to form a second hydrocarbon stream comprising deoxygenated hydrocarbons, water, recycle gas, carbon dioxide, and hydrogen sulfide; separating the carbon dioxide and the hydrogen sulfide from the second hydrocarbon stream to form a third recycle stream comprising recycle gas, carbon dioxide, and hydrogen sulfide; selectively scrubbing the hydrogen sulfide from the third recycle stream to form a fourth recycle stream comprising recycle gas and carbon dioxide and a fifth recycle stream comprising hydrogen sulfide; and selectively scrubbing the carbon dioxide from the fourth recycle stream.