Hydrocracking process with recycle, comprising adsorption of polyaromatic compounds from the recycled fraction on an adsorbant based on silica-alumina with a controlled macropore content
AssigneeInstitut Francais du Petrole
InventorsKarin Barthelet, Patrick Euzen, Hugues Dulot, Patrick Bourges
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Abstract
The invention concerns an improved hydrocracking process with a recycle having a step for eliminating polyaromatic compounds from at least a portion of the recycled fraction by adsorption on a particular adsorbent based on alumina-silica with a controlled macropore content.
Claims20
An improved hydrocracking process with a recycle, comprising eliminating polyaromatic compounds from at least a portion of the recycle by adsorbing said polyaromatic compounds on an adsorbant comprising alumina and silica with a mass content of silica (SiO2) of more than 5% by weight to 95%, said adsorbant having:
- a sodium content of less than 0.03% by weight;
- a total pore volume, measured by mercury porosimetry, in the range 0.45 to 1.2 ml/g;
- a porosity such that:
- i) the volume of mesopores with a diameter in the range 40 Å to 150 Å and a mean pore diameter in the range 80 Å to 140 Å represents 30-80% of the total pore volume measured by mercury porosimetry;
- ii) the volume of macropores with a diameter of more than 500 Å represents 20-80% of the total pore volume measured by mercury porosimetry;
- a BET specific surface area in the range 200 to 550 m2/g;
- and
- an X ray diffraction diagram which contains at least the principal characteristic peaks of at least one of the transition aluminas included in the group composed of alpha, rho, khi, eta, gamma, kappa, theta and delta aluminas.
An improved hydrocracking process with a recycle, comprising eliminating polyaromatic compounds from at least a portion of the recycle by adsorbing said polyaromatic compounds on an adsorbant comprising alumina and silica with a mass content of silica (SiO2) of more than 5% by weight to 95%, said adsorbant having:
- a sodium content of less than 0.03% by weight;
- a total pore volume, measured by mercury porosimetry, in the range 0.45 to 1.2 ml/g;
- a porosity such that:
- iii) the volume of mesopores with a diameter in the range 40 Å to 150 Å and a mean pore diameter in the range 80 Å to 140 Å represents 30-80% of the total pore volume measured by mercury porosimetry;
- iv) the volume of macropores with a diameter of more than 500 Å represents 20-80% of the total pore volume measured by mercury porosimetry;
- a BET specific surface area in the range 200 to 550 m2/g;
- and
- an X ray diffraction diagram which contains at least the principal characteristic peaks of at least one of the transition aluminas included in the group composed of alpha, rho, khi, eta, gamma, kappa, theta and delta aluminas and wherein the adsorbant undergoes a burning regeneration treatment after the adsorption step.
An improved hydrocracking process with a recycle, comprising eliminating polyaromatic compounds from at least a portion of the recycle by adsorbing said polyaromatic compounds on an adsorbant comprising alumina and silica with a mass content of silica (SiO2) of more than 5% by weight to 95%, said adsorbant having:
- a sodium content of less than 0.03% by weight;
- a total pore volume, measured by mercury porosimetry, in the range 0.45 to 1.2 ml/g;
- a porosity such that:
- v) the volume of mesopores with a diameter in the range 40 Å to 150 Å and a mean pore diameter in the range 80 Å to 140 Å represents 30-80% of the total pore volume measured by mercury porosimetry;
- vi) the volume of macropores with a diameter of more than 500 Å represents 20-80% of the total pore volume measured by mercury porosimetry;
- a BET specific surface area in the range 200 to 550 m2/g;
- and
- an X ray diffraction diagram which contains at least the principal characteristic peaks of at least one of the transition aluminas included in the group composed of alpha, rho, khi, eta, gamma, kappa, theta and delta aluminas, and wherein the adsorbant undergoes a burning regeneration treatment, which treatment comprises:
- hot stripping with an inert gas such as nitrogen at a temperature in the range 200-300° C.;
- burning in the presence of air added to nitrogen in a proportion of the order of 5%, at a temperature of the order of 400° C.;
- burning in the presence of air added to nitrogen in a proportion of the order of 5%, at a temperature of the order of 450° C.;
- and
- raising then maintaining the temperature to a level in the range 500° C. to 550° C. for about 12 hours.
An improved hydrocracking process with a recycle, comprising eliminating polyaromatic compounds from at least a portion of the recycle by adsorbing said polyaromatic compounds on an adsorbant comprising alumina and silica with a mass content of silica (SiO2) of more than 5% by weight to 95%, said adsorbant having:
- a sodium content of less than 0.03% by weight;
- a total pore volume, measured by mercury porosimetry, in the range 0.45 to 1.2 ml/g;
- a porosity such that:
- vii) the volume of mesopores with a diameter in the range 40 Å to 150 Å and a mean pore diameter in the range 80 Å to 140 Å represents 30-80% of the total pore volume measured by mercury porosimetry;
- viii) the volume of macropores with a diameter of more than 500 Å represents 20-80% of the total pore volume measured by mercury porosimetry;
- a BET specific surface area in the range 200 to 550 m2/g;
- and
- an X ray diffraction diagram which contains at least the principal characteristic peaks of at least one of the transition aluminas included in the group composed of alpha, rho, khi, eta, gamma, kappa, theta and delta aluminas, and wherein adsorption is carried out at a temperature in the range 50° C. to 250° C., a pressure in the range 1 to 200 bars and a HSV in the range 0.01 to 500 h−1.
Dependencies are inferred from the claim text.