Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
287 words
A MULTI-ZONE METHOD FOR DESULFURIZING A CRUDE PETROLEUM CHARGE OR ATMOSPHERIC RESIDUAL CHARGE CONTAINING AT LEAST 100 PPM OF METALS FROM THE GROUP CONSISTING OF VANADIUM AND NICKEL WHEREIN SAID CHARGE, IN LIQUID PHASE, IS PASSED UPWARDLY WITH HYDROGEN-RICH GAS THROUGH A FIRST REACTION ZONE CONTAINING A PARTICULATE CONTACT MATERIAL AND THE EFFUENT FROM SAID FIRST REACTION ZONE IN THEN PASSED WITH HYDROGEN-RICH GAS UPWARDLY THROUGH A SECOND REACTION ZONE CONTAINING A PARTICULATE HYDRODESULFURIZATION CATALYST, UNDER CONDITIONS IN WHICH SAID CONTACT MATERIAL AND SAID HYDRODESULFURIZATION CATALYST ARE MAINTAINED IN RANDOM MOTION IN THE LIQUID AND WHEREIN THE TEMPERATURE IN SAID FIRST REACTION ZONE IS MAINTAINED IN THE RANGE OF 730* TO 825*F AND THE HYDROGEN PARTIAL PRESSURE IS IN THE RANGE OF 1000-2500 PSI AND SPACE VELOCITY IN THE ORDER OF 0.2-1.5 VOLUME OF FEED/HR/ VOLUME OF REACTION ZONE, THE IMPROVEMENT WHICH COMPRISES: A. MAINTAINING POROUS ALUMINA AS SAID CONTACT MATERIAL IN SAID FIRST REACTION ZONE SAID ALUMINA HAVING A PORE VOLUME OF MORE THAN 0.15 CC/GRAM OF PORES HAVING A DIAMETER IN EXCESS OF 125A, B. MINTINING REACTION CONDITIONS IN SAID SECOND REACTION ZONE SUBSTANTIALLY AT THE SAME PRESSURE AS IN SAID FIRST REACTION ZONE WITH A MAXIMUM HYDROGEN RATE OF 5000 SCF/BARREL, THE TEMPERATURE BEING BETWEEN 700* AND 800*F, THE SPACE VELOCITY BEING BETWEEN 0.3 AND 1.5 VOLUME OF FEED/HOUR/VOLUME OF REACTION SPACE WHEREIN NO MORE THAN 20 PPM OF VANADIUM IS REMOVED IN SAID SECOND ZONE WHILE A DESULFURIZATION OF AT LEAST 75 PERCENT IS ACHIEVED IN SAID SECOND ZONE, SAID CATALYST IN SAID SECOND REACTION ZONE COMPRISING A GROUP VI-B METAL AND IRON GROUP METAL ON ALUMINA, SAD CATALYST HAVING A PORE STRUCTURE WITH LESS THAN 0.10 CC/GRAM IN PORES LARGER THAN 125A.
Claim 2
Dependent Claim
287 words
A MULTI-ZONE METHOD FOR DESULFURIZING A CRUDE PETROLEUM CHARGE OR ATMOSPHERIC RESIDUAL CHARGE CONTAINING AT LEAST 100 PPM OF METALS FROM THE GROUP CONSISTING OF VANADIUM AND NICKEL WHEREIN SAID CHARGE, IN LIQUID PHASE, IS PASSED UPWARDLY WITH HYDROGEN-RICH GAS THROUGH A FIRST REACTION ZONE CONTAINING A PARTICULATE CONTACT MATERIAL AND THE EFFUENT FROM SAID FIRST REACTION ZONE IN THEN PASSED WITH HYDROGEN-RICH GAS UPWARDLY THROUGH A SECOND REACTION ZONE CONTAINING A PARTICULATE HYDRODESULFURIZATION CATALYST, UNDER CONDITIONS IN WHICH SAID CONTACT MATERIAL AND SAID HYDRODESULFURIZATION CATALYST ARE MAINTAINED IN RANDOM MOTION IN THE LIQUID AND WHEREIN THE TEMPERATURE IN SAID FIRST REACTION ZONE IS MAINTAINED IN THE RANGE OF 730* TO 825*F AND THE HYDROGEN PARTIAL PRESSURE IS IN THE RANGE OF 1000-2500 PSI AND SPACE VELOCITY IN THE ORDER OF 0.2-1.5 VOLUME OF FEED/HR/ VOLUME OF REACTION ZONE, THE IMPROVEMENT WHICH COMPRISES: A. MAINTAINING POROUS ALUMINA AS SAID CONTACT MATERIAL IN SAID FIRST REACTION ZONE SAID ALUMINA HAVING A PORE VOLUME OF MORE THAN 0.15 CC/GRAM OF PORES HAVING A DIAMETER IN EXCESS OF 125A, B. MINTINING REACTION CONDITIONS IN SAID SECOND REACTION ZONE SUBSTANTIALLY AT THE SAME PRESSURE AS IN SAID FIRST REACTION ZONE WITH A MAXIMUM HYDROGEN RATE OF 5000 SCF/BARREL, THE TEMPERATURE BEING BETWEEN 700* AND 800*F, THE SPACE VELOCITY BEING BETWEEN 0.3 AND 1.5 VOLUME OF FEED/HOUR/VOLUME OF REACTION SPACE WHEREIN NO MORE THAN 20 PPM OF VANADIUM IS REMOVED IN SAID SECOND ZONE WHILE A DESULFURIZATION OF AT LEAST 75 PERCENT IS ACHIEVED IN SAID SECOND ZONE, SAID CATALYST IN SAID SECOND REACTION ZONE COMPRISING A GROUP VI-B METAL AND IRON GROUP METAL ON ALUMINA, SAD CATALYST HAVING A PORE STRUCTURE WITH LESS THAN 0.10 CC/GRAM IN PORES LARGER THAN 125A.
Claim 3
Dependent Claim
43 words
The method as claimed in claim 1 wherein said atmospheric residual charge is a heavy Venezuelan atmospheric bottoms containing in the order of 400 ppm of metals and the first stage operation is conducted under conditions to remove approximately 75% of the metals.
Claim 4
Dependent Claim
43 words
The method as claimed in claim 1 wherein said atmospheric residual charge is a light Venezuelan atmospheric bottoms containing in the order of 200 ppm of metals and the first stage operation is conducted under conditions to remove approximately 70% of the metals.
Claim 5
Dependent Claim
42 words
The method as claimed in claim 1 wherein said atmospheric residual charge is a Khafji atmospheric bottoms having in the order of 100 ppm of metals and the first stage operation is conducted under conditions to remove approximately 60% of the metals.