Method of producing single-ring aromatic hydrocarbons

Patent metadata

Field	Value
Publication number	US-9382173-B2
Application number	US-201214006974-A
Country	US
Kind code	B2
Filing date	Mar 23, 2012
Priority date	Mar 25, 2011
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

Provided is a method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms, the method including a cracking reforming reaction step of bringing feedstock oil into contact with a catalyst to effect a reaction; a step of purifying and recovering monocyclic aromatic hydrocarbons separated from the reaction step; and (1) a step of hydrogenating a heavy fraction separated from the reaction step; a dilution step of returning a portion of the hydrogenation product as a diluent oil to the hydrogenation step; and a step of returning the hydrogenation product to the reaction step; or (2) a step of adding a diluent to the heavy fraction separated from the reaction step; a step of hydrogenating the mixture; and a step of returning the hydrogenation product to the reaction step.

First claim

The invention claimed is:

1. A method for producing monocyclic aromatic hydrocarbons, by which monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms are produced from a feedstock oil having a 10 vol % distillation temperature of 140° C. or higher and a 90 vol % distillation temperature of 380° C. or lower, the method comprising:
a cracking reforming reaction step of bringing the feedstock oil into contact with a catalyst for monocyclic aromatic hydrocarbon production comprising a crystalline aluminosilicate to effect a reaction, wherein saturated hydrocarbons contained in the feedstock oil are used as a hydrogen donating source, polycyclic aromatic hydrocarbons are partially hydrogenated by a hydrogen transfer reaction from the saturated hydrocarbons, ring-opening is carried out and the polycyclic aromatic hydrocarbons are converted to monocyclic aromatic hydrocarbons, thereby obtaining a product containing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms and a heavy fraction having 9 or more carbon atoms;
a separation step of separating the product produced in the cracking reforming reaction step into a plurality of fractions;
a purification/recovery step of purifying and recovering monocyclic aromatic hydrocarbons separated in the separation step;
a hydrogenation step of hydrogenating the heavy fraction having 9 or more carbon atoms separated from the product produced in the cracking reforming reaction step;
a dilution step of adding a portion of a hydrogenation product of the heavy fraction having 9 or more carbon atoms obtained in the hydrogenation step, or a diluent to the heavy fraction having 9 or more carbon atoms separated from the product produced in the cracking reforming reaction step; and
a recycling step of returning the other portion of the hydrogenation product of the heavy fraction obtained in the hydrogenation step to the cracking reforming reaction step.

2. The method for producing monocyclic aromatic hydrocarbons according to claim 1 , by which monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms are produced from a feedstock oil having a 10 vol % distillation temperature of 140° C. or higher and a 90 vol % distillation temperature of 380° C. or lower, the method further comprising:
a purification/recovery step of purifying and recovering monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms separated from the product produced in the cracking reforming reaction step;
a dilution step of returning a portion of a hydrogenation product of the heavy fraction having 9 or more carbon atoms obtained in the hydrogenation step, as a diluent oil to the hydrogenation step.

3. The method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms according to claim 2 , wherein in the dilution step, the amount of the diluent oil returned to the hydrogenation step is adjusted such that the mass ratio of the heavy fraction having 9 or more carbon atoms that is separated from the product produced in the cracking reforming reaction step and is supplied to the hydrogenation step, to the diluent oil is in the range of 10:90 to 80:20.

4. The method for producing monocyclic aromatic hydrocarbons according to claim 1 , by which monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms are produced from a feedstock oil having a 10 vol % distillation temperature of 140° C. or higher and a 90 vol % distillation temperature of 380° C. or lower, the method further comprising:
a hydrogenation step of hydrogenating a portion separated from the product produced in the cracking reforming reaction step;
a purification/recovery step of distilling the hydrogenation product obtained in the hydrogenation step to purify monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms, recovering the monocyclic aromatic hydrocarbons, and separating a heavy fraction having 9 or more carbon atoms from the monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms;
a dilution step of returning a portion of the heavy fraction having 9 or more carbon atoms separated in the purification/recovery step, as a diluent oil to the hydrogenation step.

5. The method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms according to claim 4 , wherein in the dilution step, the amount of the diluent oil returned to the hydrogenation step is adjusted such that the mass ratio of the product that is separated from the product produced in the cracking reforming reaction step and is supplied to the hydrogenation step, to the diluent oil is in the range of 20:80 to 80:20.

6. The method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms according to claim 2 , wherein in the dilution step, the diluent oil is returned to the hydrogenation step such that the concentration of polycyclic aromatic hydrocarbons in a mixed oil of the product that is separated from the product produced in the cracking reforming reaction step and is supplied to the hydrogenation step, and the diluent oil is 5 mass % to 50 mass %.

7. The method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms according to claim 2 , wherein in the hydrogenation step, the hydrogenation pressure is set to 0.7 MPa to 13 MPa.

8. The method for producing monocyclic aromatic hydrocarbons according to claim 1 , by which monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms are produced from a feedstock oil having a 10 vol % distillation temperature of 140° C. or higher and a 90 vol % distillation temperature of 380° C. or lower, the method further comprising:
a purification/recovery step of purifying and recovering monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms separated from the product produced in the cracking reforming reaction step;
a dilution step of adding a diluent comprising hydrocarbons to the heavy fraction having 9 or more carbon atoms separated from the product produced in the cracking reforming reaction step;
a hydrogenation step of hydrogenating the mixture; and
a recycling step of returning the hydrogenation product of the mixture obtained in the hydrogenation step to the cracking reforming reaction step.

9. The method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms according to claim 8 , further comprising a diluent recovering step of separating and removing the diluent from the hydrogenation product of the mixture obtained in the hydrogenation step, recovering the diluent, and reutilizing the diluent as a diluent to be added to the heavy fraction having 9 or more carbon atoms.

10. The method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms according to claim 9 , wherein a hydrocarbon oil having a boiling point lower than 185° C. is used as the diluent.

11. The method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms according to claim 8 , wherein a diluent having a concentration of polycyclic aromatic hydrocarbons of 50 mass % or less is used as the diluent.

12. The method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms according to claim 8 , wherein in the dilution step, the amount of the diluent is adjusted such that the mass ratio of the heavy fraction having 9 or more carbon atoms that is separated from the product produced in the cracking reforming reaction step and is supplied to the hydrogenation step, to the diluent is in the range of 10:90 to 80:20.

13. The method for producing monocyclic aromatic hydrocarbons having 6 to 8 carbon atoms according to claim 8 , wherein in the dilution step, the diluent is added such that the concentration of polycyclic aromatic hydrocarbons in the mixture obtainable

Assignees

• Yanagawa Shinichiro
• Ida Ryoji
• Iwasa Yasuyuki
• Kobayashi Masahide
• Yasui Susumu
• Sugi Yoshishige
• Fukui Atsushi
• Nagumo Atsuro
• Jx Nippon Oil & Energy Corp
• Chiyoda Corp

Inventors

• Yanagawa Shinichiro
• Ida Ryoji
• Iwasa Yasuyuki
• Kobayashi Masahide
• Yasui Susumu
• Sugi Yoshishige
• Fukui Atsushi
• Nagumo Atsuro

Classifications

• C10G2300/802

  Diluents · CPC title

• C10G35/095

  containing crystalline alumino-silicates, e.g. molecular sieves {(C10G35/065 takes precedence)} · CPC title

• C10G2400/30

  Aromatics · CPC title

• Y02P20/132

  Cross-Sectional Technologies · mapped topic

• C07C4/06

  Catalytic processes {(C07C4/025 takes precedence)} · CPC title