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US3915894A Expired / Lapsed US ⏱️ 0.0 years remaining

Activation of hydrotreating catalysts

Assignee: CROSFIELD CHEMICALS COMPANY A DIVISION OF INDOPCO Inc A CORP OF DELAWARE
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Filing: 1974-02-01
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Granted: 1975-10-28
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Expires: 1994-02-01
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Abstract

Abstract A stagewise process for presulfiding a catalyst bed in a reactor useful for hydrotreating fuel stocks which comprises: A. HEATING THE CATALYST BED TO A TEMPERATURE OF ABOUT 350*450*F. and purging said bed with a nonreducing gas selected from an inert gas and dry steam for about 2 hours while holding the temperature at 350*-450*F.; b. adjusting the pressure in the bed to about 150-250 psig and filling the bed and reactor with liquid feedstock preheated to 400*F. containing CS2 added in the amount of about 1.3-6.3 lbs/bbl oil based on sulfur; C. RECYCLING THE OIL AND MAINTAINING THE CS2 concentration by regular addition of CS2 for about 1-3 hours, utilizing a circulating volume of about 2-5 LHSV; d. upwardly adjusting the temperature of the catalyst bed to about 600*F. in about 1.5-2.0 hours without CS2 addition and concurrently treating with hydrogen under recycle at about 8001500 scfb and at about 150-550 psig; E. COMPLETING PRESULFIDING ON STREAM BY TREATING THE CATALYST BED WITH LIQUID FEEDSTOCK AT ABOUT 1-2 LHSV for about 8-16 hours, utilizing hydrogen recycle at about 1000 scfb. Optionally, the hydrogen in (d) and (e) may be added by a procedure other than recycle.

Inventors

  • 👤 Porter Clements
  • 👤 Oliver L Davies

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 07:17
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/20; C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/06; C10G45/08

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 214 words
A STAGEWISE PROCESS FOR PRESULFIDING A CATALYST BED WHEREIN THE CATALYST CONTAINS AN OXIDE OF AN ACTIVE METAL OF GROUP V1B AND V111 SELECTED FROM THE SUBGROUP CONSISTING OF COBALT, AND NICKEL IN A REACTOR USEFUL FOR HYDROTREATING FUEL STOCK WHICH COMPRISES: A. BRINGING THE CATALYST BED TO A TEMPERATURE OF 350*-450*F, AND PURGING SAID BED WITH A NONREDUCING GAS SELECTED FROM AN INERT GAS DRY STREAM FOR ABOUT 2 HOURS WHILE HOLDING THE TEMPERATURE AT 350*-450*F, B. ADJUSTING THE PRESSURE IN THE BED TO ABOUT 150-250 PSIG AND FILLING THE BED AND REACTOR WITH LIQUID HYDROCARBON FEEDSTOCK PREHEATED TO 400*F, CONTAINING CS2 ADDED IN THE AMOUNT OF ABOUT 1,3-6.3 LBS/BBL OIL BASED ON SULFUR, C. RECYCLING THE OIL MAINTAINING THE CS2 CONCENTRATION BY REGULAR ADDITION OF CS2 FOR ABOUT 1-3 HOURS UTILIZING A CIRCULATING VOLUME OF ABOUT 2-5 LHSV: D. WHEREIN STAGES (A), (B) AND (C) ARE CARRIED OUT IN THE ABSENCE OF H2, E. UPWARDLY ADJUSTING THE TEMPERATURE OF CATALYST BED CONTAINING LIQUID HYDROCARBON FEEDSTOCK TO ABOUT 600*F, FOR ABOUT 1,5-2.0 HOURS MINUS CS2 ADDITION AND CONCURRENTLY TREATING WITH HYDROGEN AT ABOUT 800-1500 SCF/BBL AND AT ABOUT 150-550 PSIG, F. COMPLETINE ON STREAM PRESULFIDING LIQUID HYDROCARBON FEEDSTOCK AT ABOUT 1-2LHSV FOR ABOUT 8-16 HOURS AND CONCURRENTLY USING HYDROGEN AT ABOUT 1000 SCF/BBL.
Claim 2
Dependent Claim 214 words
A STAGEWISE PROCESS FOR PRESULFIDING A CATALYST BED WHEREIN THE CATALYST CONTAINS AN OXIDE OF AN ACTIVE METAL OF GROUP V1B AND V111 SELECTED FROM THE SUBGROUP CONSISTING OF COBALT, AND NICKEL IN A REACTOR USEFUL FOR HYDROTREATING FUEL STOCK WHICH COMPRISES: A. BRINGING THE CATALYST BED TO A TEMPERATURE OF 350*-450*F, AND PURGING SAID BED WITH A NONREDUCING GAS SELECTED FROM AN INERT GAS DRY STREAM FOR ABOUT 2 HOURS WHILE HOLDING THE TEMPERATURE AT 350*-450*F, B. ADJUSTING THE PRESSURE IN THE BED TO ABOUT 150-250 PSIG AND FILLING THE BED AND REACTOR WITH LIQUID HYDROCARBON FEEDSTOCK PREHEATED TO 400*F, CONTAINING CS2 ADDED IN THE AMOUNT OF ABOUT 1,3-6.3 LBS/BBL OIL BASED ON SULFUR, C. RECYCLING THE OIL MAINTAINING THE CS2 CONCENTRATION BY REGULAR ADDITION OF CS2 FOR ABOUT 1-3 HOURS UTILIZING A CIRCULATING VOLUME OF ABOUT 2-5 LHSV: D. WHEREIN STAGES (A), (B) AND (C) ARE CARRIED OUT IN THE ABSENCE OF H2, E. UPWARDLY ADJUSTING THE TEMPERATURE OF CATALYST BED CONTAINING LIQUID HYDROCARBON FEEDSTOCK TO ABOUT 600*F, FOR ABOUT 1,5-2.0 HOURS MINUS CS2 ADDITION AND CONCURRENTLY TREATING WITH HYDROGEN AT ABOUT 800-1500 SCF/BBL AND AT ABOUT 150-550 PSIG, F. COMPLETINE ON STREAM PRESULFIDING LIQUID HYDROCARBON FEEDSTOCK AT ABOUT 1-2LHSV FOR ABOUT 8-16 HOURS AND CONCURRENTLY USING HYDROGEN AT ABOUT 1000 SCF/BBL.
Claim 3
Dependent Claim 15 words
The process of claim 1 wherein the amount of CS2 is about 1.85 lbs/bbl oil.
Claim 4
Dependent Claim 20 words
The process of claim 1 wherein the CS2 containing oil is circulated at about 4 LHSV for about 2 hours.
Claim 5
Dependent Claim 9 words
In claim 1 where the catalyst is nickel molybdate.
Claim 6
Dependent Claim 9 words
In claim 1 where the catalyst is cobalt molybdate.
Claim 7
Dependent Claim 19 words
A stage-wise process according to claim 1 wherein in steps (e) and (f) the hydrogen is utilized under recycle.

References Cited (Backward Citations)

US3477963A Cited
US3481862A Cited
US3516926A Cited
US3644433A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-10-27 1979-04-28 1979-10-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-10-27 1983-04-28 1983-10-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-10-27 1987-04-28 1987-10-28 $7700.00 Window Closed / Lapsed

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