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US 11,453,829 B2Granted
Process for improving the production of benzene and toluene
AssigneeIfp Energies Nouvelles
InventorsCeline Bertino-Ghera, Alexandre Pagot
Life of this patent
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Abstract
The invention relates to a process for the production of C6-C7 aromatic compounds from a hydrocarbon feedstock of naphtha type comprising a step of fractionating (2) the feedstock in order to obtain an upper stream and a lower stream, a step of catalytic reforming of the upper stream (6) and of the lower stream (9), a step of recombining (15) the reformate effluents obtained, a step of recontacting (16) and a step of stabilizing (19) the stabilized reformate effluents and a step of separating (22) the raffinate in order to recover C6 and C7 hydrocarbon compounds.
Claims16
A process for the production of C6-C7 aromatic compounds from a hydrocarbon feedstock comprising naphtha, said process comprising:
- a) sending said hydrocarbon feedstock (1) into a first fractionation unit (2) to obtain an upper stream (3) predominantly comprising C6 and C7 hydrocarbon compounds and a lower stream (9) predominantly comprising C8 to C10 hydrocarbon compounds;
- b) sending the upper stream (3) into a first catalytic reforming unit (6) to obtain a first reformate effluent (8);
- c) sending the lower stream (9) into a second catalytic reforming unit (12) to obtain a second reformate effluent (14);
- d) combining the first reformate effluent (8) and the second reformate effluent (14) to produce a combined reformate stream (15) and sending the combined stream (15) into a recontacting section (16) to obtain a first gaseous effluent (45) rich in hydrogen and a liquid hydrocarbon effluent (46),
- wherein step d) comprises:
- i) separating the combined reformate stream (15) into a gaseous phase (31) and a liquid phase containing hydrocarbons (32);
- ii) cooling the liquid phase (32) resulting from step i) to a temperature below or equal to 45° C. by means of a cooling device (43);
- and
- iii) carrying out a first recontacting of the cooled liquid phase (32) with the gaseous phase (31) in a separator (44) to recover the first gaseous effluent (45) rich in hydrogen and the first liquid hydrocarbon effluent (46);
- e) sending the first liquid hydrocarbon effluent (46) into a stabilization section (19) to recover a second gaseous effluent (52) enriched in C1 and C2 hydrocarbon compounds, a liquid phase predominantly containing C3 and C4 hydrocarbons (20) and a liquid fraction (21) predominantly comprising hydrocarbon compounds having at least four carbon atoms,
- wherein step e) comprises:
- iv) carrying out a second recontacting of the first liquid hydrocarbon effluent (46) with a recycle gas (49) and separating the second gaseous effluent (52) enriched in C1 and C2 hydrocarbons and a second liquid hydrocarbon effluent (55);
- v) fractionating the second liquid hydrocarbon effluent (55) resulting from step iv) in a fractionating column (63) to separate an overhead gaseous fraction (58) and a bottom liquid fraction (21) containing hydrocarbons having at least 4 carbon atoms;
- and
- vi) condensing the overhead gaseous fraction (58) resulting from step v) and separating the liquid phase predominantly containing C3 and C4 hydrocarbons (20) and the recycle gas (49), wherein the recycle gas is recycled to step iv),
- f) sending said bottom liquid fraction (21) into a reformate separation column (22) to obtain an overhead stream (23) comprising said C6-C7 aromatic hydrocarbon compounds and a bottom stream (24) comprising hydrocarbon compounds having at least eight carbon atoms,
- wherein, before the cooling in step ii), the liquid phase (32) resulting from step i) is precooled by heat exchange in an exchanger (39) fed with the first gaseous effluent (45) and/or the first liquid hydrocarbon effluent (46) resulting from step iii).
14 more elements
A process for the production of C6-C7 aromatic compounds from a hydrocarbon feedstock comprising naphtha, said process comprising:
- a) sending said hydrocarbon feedstock (1) into a first fractionation unit (2) to obtain an upper stream (3) predominantly comprising C6 and C7 hydrocarbon compounds and a lower stream (9) predominantly comprising C8 to C10 hydrocarbon compounds;
- b) sending the upper stream (3) into a first catalytic reforming unit (6) to obtain a first reformate effluent (8);
- c) sending the lower stream (9) into a second catalytic reforming unit (12) to obtain a second reformate effluent (14);
- d) combining the first reformate effluent (8) and the second reformate effluent (14) to produce a combined reformate stream (15) and processing said combined reformate stream (15) by:
- (i) separating the combined reformate stream (15) into a gaseous phase (31) and a liquid phase containing hydrocarbons (32);
- (ii) precooling the liquid phase (32) resulting from step i) by heat exchange in an exchanger (39) fed with a first gaseous effluent (45) and/or a first liquid hydrocarbon effluent (46) resulting from step iii), and cooling the liquid phase (32) resulting from the precooling to a temperature below or equal to 45° C. by means of a cooling device (43);
- (iii) carrying out a first recontacting of the cooled liquid phase (32) with the gaseous phase (31) in a separation means (44) a first gaseous effluent (45) rich in hydrogen and a first liquid hydrocarbon effluent (46);
- (e) processing the first liquid hydrocarbon effluent (46) by:
- (iv) carrying out a second recontacting of the first liquid hydrocarbon effluent (46) with a recycle gas (49) and separating a second gaseous effluent (52) enriched in C1 and C2 hydrocarbons and a second liquid hydrocarbon effluent (55);
- (v) fractionating the second liquid hydrocarbon effluent of (55) resulting from step (iv) in a fractionating column (63) to separate an overhead gaseous fraction (58) and a bottom liquid fraction (21) containing hydrocarbons having at least 4 carbon atoms;
- (vi) condensing the overhead gaseous fraction (58) resulting from step (v) and separating a liquid phase predominantly containing C3 and C4 hydrocarbons (20) and the recycle gas (49) which is recycled to step iv);
- f) sending said bottom liquid fraction (21) into a reformate separation column (22) to obtain an overhead stream (23) comprising said C6-C7 aromatic hydrocarbon compounds and a bottom stream (24) comprising hydrocarbon compounds having at least eight carbon atoms.
9 more elements
A process for the production of C6-C7 aromatic compounds from a hydrocarbon feedstock comprising naphtha, said process comprising:
- a) sending said hydrocarbon feedstock (1) into a first fractionation unit (2) to obtain an upper stream (3) predominantly comprising C6 and C7 hydrocarbon compounds and a lower stream (9) predominantly comprising C8 to C10 hydrocarbon compounds;
- b) sending the upper stream (3) into a first catalytic reforming unit (6) to obtain a first reformate effluent (8);
- c) sending the lower stream (9) into a second catalytic reforming unit (12) to obtain a second reformate effluent (14);
- d) combining the first reformate effluent (8) and the second reformate effluent (14) to produce a combined reformate stream (15) and processing said combined reformate stream (15) by:
- (i) separating the combined reformate stream (15) into a gaseous phase (31) and a liquid phase containing hydrocarbons (32);
- (ii) precooling the liquid phase (32) resulting from step i) by heat exchange in an exchanger (39) fed with a first gaseous effluent (45) resulting from step (iii), cooling the gaseous phase (31) resulting from step (i) in an exchanger (41) fed with the first liquid hydrocarbon effluent (46), and cooling the liquid phase (32) resulting from the precooling to a temperature below or equal to 45° C. by means of a cooling device (43);
- (iii) carrying out a first recontacting of the liquid phase (32) cooled with the gaseous phase (31) in a separation means (44) recovering a first gaseous effluent (45) rich in hydrogen and a first liquid hydrocarbon effluent (46);
- (e) processing the first liquid hydrocarbon effluent (46) by:
- (iv) carrying out a second recontacting of the first liquid hydrocarbon effluent (46) with a recycle gas (49) and separating a second gaseous effluent (52) enriched in C1 and C2 hydrocarbons and a second liquid hydrocarbon effluent (55);
- (v) fractionating the second liquid hydrocarbon effluent (55) resulting from step (iv) in a fractionating column (63) to separate an overhead gaseous fraction (58) and a bottom liquid fraction (21) containing hydrocarbons having at least 4 carbon atoms;
- (vi) condensing the overhead gaseous fraction (58) resulting from step (v) and separating a liquid phase predominantly containing C3 and C4 hydrocarbons (20) and the recycle gas (49) which is recycled to step iv);
- f) sending said bottom liquid fraction (21) into a reformate separation column (22) to obtain an overhead stream (23) comprising said C6-C7 aromatic hydrocarbon compounds and a bottom stream (24) comprising hydrocarbon compounds having at least eight carbon atoms.
9 more elements
A process for the production of C6-C7 aromatic compounds from a hydrocarbon feedstock comprising naphtha, said process comprising:
- a) sending said hydrocarbon feedstock (1) into a first fractionation unit (2) to obtain an upper stream (3) predominantly comprising C6 and C7 hydrocarbon compounds and a lower stream (9) predominantly comprising C8 to C10 hydrocarbon compounds;
- b) sending the upper stream (3) into a first catalytic reforming unit (6) to obtain a first reformate effluent (8);
- c) sending the lower stream (9) into a second catalytic reforming unit (12) to obtain a second reformate effluent (14);
- d) combining the first reformate effluent (8) and the second reformate effluent (14) to produce a combined reformate stream (15) and processing said combined reformate stream (15) by:
- (i) separating the combined reformate stream (15) into a gaseous phase (31) and a liquid phase containing hydrocarbons (32);
- (ii) precooling the liquid phase (32) resulting from step i) by heat exchange in an exchanger (41) fed with a first liquid hydrocarbon effluent (46) resulting from step (iii), cooling the gaseous phase (31) resulting from step (i) in an exchanger (41) fed with the first gaseous effluent (45), and cooling the liquid phase (32) resulting from the precooling to a temperature below or equal to 45° C. by means of a cooling device (43);
- (iii) carrying out a first recontacting of the liquid phase (32) cooled with the gaseous phase (31) in a separation means (44) recovering a first gaseous effluent (45) rich in hydrogen and a first liquid hydrocarbon effluent (46);
- (e) processing the first liquid hydrocarbon effluent (46) by:
- (iv) carrying out a second recontacting of the first liquid hydrocarbon effluent (46) with a recycle gas (49) and separating a second gaseous effluent (52) enriched in C1 and C2 hydrocarbons and a second liquid hydrocarbon effluent (55);
- (v) fractionating the second liquid hydrocarbon effluent (55) resulting from step (iv) in a fractionating column (63) to separate an overhead gaseous fraction (58) and a bottom liquid fraction (21) containing hydrocarbons having at least 4 carbon atoms;
- (vi) condensing the overhead gaseous fraction (58) resulting from step (v) and separating a liquid phase predominantly containing C3 and C4 hydrocarbons (20) and the recycle gas (49) which is recycled to iv);
- f) sending said bottom liquid fraction (21) into a reformate separation column (22) to obtain an overhead stream (23) comprising said C6-C7 aromatic hydrocarbon compounds and a bottom stream (24) comprising hydrocarbon compounds having at least eight carbon atoms.
9 more elements
Dependencies are inferred from the claim text.