Production of diesel fuel from renewable feedstocks with reduced hydrogen consumption
AssigneesUop LLC, ENI S.p.A.
InventorsTerry L. Marker, Peter Kokayeff, Giovanni Faraci, Franco Baldiraghi
Life of this patent
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Abstract
A process has been developed for producing diesel boiling range fuel from renewable feedstocks such as plant and animal fats and oils. The process involves treating a renewable feedstock by hydrogenating and deoxygenating to provide a hydrocarbon fraction useful as a diesel boiling range fuel. Water is added to the deoxygenation reaction to drive carbon monoxide and water to react to form hydrogen and carbon dioxide. The hydrogen is then consumed by the reactions. If desired, the hydrocarbon fraction can be isomerized to improve cold flow properties.
Claims25
A process for producing a paraffin-rich diesel product from a renewable feedstock comprising:
- a) adding from about 0.1 to about 30 mass-% water to the feedstock or to a first reaction zone, wherein the mass-% water is measured as mass-% water of the total feed to the first reaction zone including any recycle;
- b) treating the feedstock and treating the water in the first reaction zone by hydrogenating and deoxygenating the feedstock and converting carbon monoxide and water to carbon dioxide and hydrogen using a catalyst at reaction conditions in the presence of hydrogen to provide a first reaction zone product stream comprising hydrogen, carbon dioxide, and a hydrocarbon fraction comprising n-paraffins having from about 8 to about 24 carbon atoms;
- c) separating the first reaction zone product stream to form
- i) a stream comprising hydrogen and carbon dioxide,
- ii) a stream comprising the hydrocarbon fraction, and
- iii) a water stream;
- and
- d) recovering the hydrocarbon fraction as product.
A process for producing a paraffin-rich diesel product from a renewable feedstock comprising;
- a) adding from about 0.1 to about 30 mass-% water to the feedstock or to a first reaction zone, wherein the mass-% water is measured as mass-% water of the total feed to the first reaction zone including any recycle;
- b) treating the feedstock and the water in the first reaction zone by hydrogenating and deoxygenating the feedstock and converting carbon monoxide and water to carbon dioxide and hydrogen using a catalyst at reaction conditions in the presence of hydrogen to provide a first reaction zone product stream comprising hydrogen, carbon dioxide, and paraffins having from about 8 to about 24 carbon atoms;
- c) separating, in a hot high pressure hydrogen stripper, the first reaction zone product stream into a gaseous stream comprising hydrogen and at least a portion of the water and carbon dioxide from the first reaction zone product stream and remainder stream comprising at least the paraffins;
- d) recycling a portion of the remainder stream to the first reaction zone;
- e) separating a combination of the gaseous stream and a portion of the remainder stream to provide:
- i) a stream comprising hydrogen and carbon dioxide
- ii) a stream comprising paraffins;
- and
- iii) a water stream;
- and
- f) recovering the stream comprising paraffins.
A process for producing a branched-paraffin-rich diesel product from a renewable feedstock comprising:
- a) adding from about 0.1 to about 30 mass-% water to the feedstock or to a first reaction zone, wherein the mass-% water is measured as mass-% water of the total feed to the first reaction zone including any recycle;
- b) treating the feedstock and the water in a first reaction zone by hydrogenating and deoxygenating the feedstock and converting carbon monoxide and water to carbon dioxide and hydrogen using a catalyst at reaction conditions in the presence of hydrogen to provide a first reaction zone product stream comprising hydrogen, carbon dioxide, and n-paraffins having from about 8 to about 24 carbon atoms;
- c) separating, in a hot high pressure hydrogen stripper, a gaseous stream comprising hydrogen and at least a portion of the water and carbon oxides from the first reaction zone product stream and introducing a remainder stream comprising at least the n-paraffins to a second reaction zone to contact an isomerization catalyst at isomerization conditions to isomerize at least a portion of the n-paraffins and generate a branched paraffin-rich stream;
- d) separating a combination of the branched paraffin-rich stream and the gaseous stream to provide:
- i) a stream comprising hydrogen and carbon dioxide;
- ii) a stream comprising branched paraffins, and
- iii) a water stream;
- and
- e) recovering the stream comprising branched paraffins.
Dependencies are inferred from the claim text.