Production of aromatics by reverse water gas shift, fermentation and recycling to pyrolysis
AssigneeIfp Energies Nouvelles
InventorsJean-Francois Joly, Frederic Feugnet
Life of this patent
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Abstract
Device and process for the conversion of a feedstock of aromatic compounds, in which the feedstock is treated notably by means of a fractionation train (4-7), a xylene separation unit (10) and an isomerization unit (11), and in which a pyrolysis unit (13) treats a second hydrocarbon feedstock, produces a pyrolysis effluent feeding the feedstock, and produces a pyrolysis gas comprising CO, CO2 and H2; a reverse water gas shift RWGS reaction section (50) treats the pyrolysis gas and produces an RWGS gas enriched in CO and in water; a fermentation reaction section (52) treats the RWGS gas enriched in CO and in water, to produce ethanol and recycle the ethanol to the inlet of the pyrolysis unit.
Claims21
A device for the conversion of a first hydrocarbon feedstock comprising aromatic compounds, comprising:
- a fractionation train (4-7) suitable for extracting at least one benzene-comprising cut (22), one toluene-comprising cut (23) and one cut comprising xylenes and ethylbenzene (24) from the first hydrocarbon feedstock (2);
- a xylene separation unit (10) suitable for treating the cut comprising xylenes and ethylbenzene (24) and producing an extract (39) comprising para-xylene and a raffinate (40) comprising ortho-xylene, meta-xylene and ethylbenzene;
- an isomerization unit (11) suitable for treating the raffinate (40) and producing an isomerate (42) enriched in para-xylene which is sent to the fractionation train (4-7);
- a pyrolysis unit (13) suitable for treating a second hydrocarbon feedstock (30), producing at least one pyrolysis effluent (31) comprising hydrocarbon compounds having 6 to 10 carbon atoms feeding, at least partially, the first hydrocarbon feedstock (2), and producing a pyrolysis gas (32) comprising at least CO, CO2 and H2;
- a reverse water gas shift RWGS reaction section (50), suitable for treating the pyrolysis gas (32) and producing an RWGS gas (51) enriched in CO and in water;
- a fermentation reaction section (52) suitable for treating the RWGS gas (51) enriched in CO and in water, producing ethanol and recycling the ethanol to the inlet of the pyrolysis unit (13).
A process for conversion of a first hydrocarbon feedstock comprising aromatic compounds, comprising:
- fractionating the first hydrocarbon feedstock (2) in a fractionation train (4-7) in order to extract at least one benzene-comprising cut (22), one toluene-comprising cut (23) and one cut comprising xylenes and ethylbenzene (24);
- separating the cut comprising xylenes and ethylbenzene (24) in a xylene separation unit (10) and producing an extract (39) comprising para-xylene and a raffinate (40) comprising ortho-xylene, meta-xylene and ethylbenzene;
- isomerizing the raffinate (40) in an isomerization unit (11) and producing an isomerate (42) enriched in para-xylene;
- sending the isomerate (42) enriched in para-xylene to the fractionation train (4-7);
- treating a second hydrocarbon feedstock (30) in a pyrolysis unit (13) in order to produce at least one pyrolysis effluent (31) comprising hydrocarbon compounds having 6 to 10 carbon atoms feeding, at least partially, the first hydrocarbon feedstock (2), and producing a pyrolysis gas (32) comprising at least CO, CO2 and H2;
- treating the pyrolysis gas (32) in an RWGS reaction section (50), in order to produce an RWGS gas (51) enriched in CO and in water;
- treating, at least in part, the RWGS gas (51) enriched in CO and in water in a fermentation reaction section (52) in order to produce ethanol;
- and
- recycling the ethanol to the inlet of the pyrolysis unit (13).
Dependencies are inferred from the claim text.