US4518485A — Hydrotreating/isomerization process to produce lo…

Claim 1

Independent Claim 117 words

A process for dewaxing a hydrocarbon feedstock containing paraffins selected from the group of normal paraffins and slightly branched paraffins and sulfur and nitrogen compounds which comprises (a) subjecting said feedstock to hydrotreating in a hydrotreating zone containing a conventional hydrotreating catalyst operated at a conventional hydrotreating conditions sufficient to remove at least a portion of said sulfur and nitrogen compounds; (b) subjecting said hydrotreated feedstock to catalytic dewaxing by contacting said feedstock with a catalyst comprising zeolite beta having a silica/alumina ratio of at least 30:1 and a hydrogenation/dehydrogenation component under isomerization conditions, sufficient to isomerize at least a portion of said normal paraffins and wherein a majority of normal paraffins converted are converted by isomerization.

Claim 2

Dependent Claim 117 words

A process for dewaxing a hydrocarbon feedstock containing paraffins selected from the group of normal paraffins and slightly branched paraffins and sulfur and nitrogen compounds which comprises (a) subjecting said feedstock to hydrotreating in a hydrotreating zone containing a conventional hydrotreating catalyst operated at a conventional hydrotreating conditions sufficient to remove at least a portion of said sulfur and nitrogen compounds; (b) subjecting said hydrotreated feedstock to catalytic dewaxing by contacting said feedstock with a catalyst comprising zeolite beta having a silica/alumina ratio of at least 30:1 and a hydrogenation/dehydrogenation component under isomerization conditions, sufficient to isomerize at least a portion of said normal paraffins and wherein a majority of normal paraffins converted are converted by isomerization.

Claim 3

Dependent Claim 12 words

Process of claim 1 in which the feedstock also includes aromatic components.

Claim 4

Dependent Claim 21 words

Process of claim 2 in which the proportion of aromatic components is from 10 to 50 weight percent of the feedstock.

Claim 5

Dependent Claim 15 words

Process of claim 1 in which the zeolite beta has a silica:alumina ratio over 100:1.

Claim 6

Dependent Claim 17 words

Process of claim 1 in which the zeolite beta has a silica:alumina ratio of at least 250:1.

Claim 7

Dependent Claim 20 words

Process of claim 1 in which the hydrogenation/dehydrogenation component comprises a noble metal of Group VIIIA of the Periodic Table.

Claim 8

Dependent Claim 29 words

Process of claim 6 in which the hydrogenation/dehydrogenation component comprises 0.01 to 10 wt %, on an elemental basis, of a member of the group of platinum and palladium.

Claim 9

Dependent Claim 25 words

Process of claim 1 in which the hydrogenation/dehydrogenation component comprises one or more metals of the group of nickel, cobalt, molybdenum, tungsten and mixtures thereof.

Claim 10

Dependent Claim 19 words

Process of claim 1 in which the feedstock is contacted with the catalyst in the absence of added hydrogen.

Claim 11

Dependent Claim 49 words

Process of claim 1 in which the feedstock is contacted with the catalyst in the presence of hydrogen under isomerization conditions of a temperature from 200° C. to 540° C., a pressure from atmospheric to 25,000 kPa and a space velocity (LHSV) from 0.1 to 20 hr. -1 .

Claim 12

Dependent Claim 48 words

Process of claim 10 in which the feedstock is contacted with the catalyst in the presence of hydrogen under isomerization conditions of a temperature from 400° to 450° C., a pressure from 2,000 to 10,000 kPa and a space velocity (LHSV) from 0.2 to 5 hr. -1 .

Claim 13

Dependent Claim 43 words

Process of claim 1 wherein said feedstock, prior to hydrotreating, contains up to 30,000 weight ppm sulfur, up to 20,000 weight ppm nitrogen and at least 10 weight percent waxy components selected from the group of normal paraffins and slightly branched chain paraffins.

Claim 14

Dependent Claim 48 words

Process of claim 1 wherein said hydrotreating catalyst comprises a hydrogenation metal on a support, and said hydrotreating conditions include a temperature of 200° C. to 450° C., a hydrogen partial pressure of 0.1 to 100 atmospheres absolute, and a liquid hourly space velocity of 0.1 to 20.

Claim 15

Dependent Claim 14 words

Process of claim 1 wherein said hydrotreating catalyst comprises Co-Mo or Ni-Mo on alumina.

Claim 16

Dependent Claim 74 words

Process of claim 1 wherein said hydrotreating conditions include a temperature of 370° C., a 2.0 liquid hourly space velocity, and wherein the total pressure in the hydrotreating reaction zone is 3550 kPa and hydrogen is present in the amount of 712 volumes of hydrogen measured at 15° C., 1 atmosphere, per volume of oil measured at 20° C., and said hydrotreating conditions include use of a catalyst of Ni-Mo or Co-Mo on alumina.

Claim 17

Dependent Claim 182 words

A process for dewaxing a hydrocarbon feedstock containing at least 10 weight percent waxy paraffins selected from the group of normal paraffins and slightly branched paraffins and sulfur and nitrogen compounds which comprises (a) subjecting said feedstock to hydrotreating in a hydrotreating zone containing a Co-Mo or Ni-Mo on alumina catalyst operated at hydrotreating conditions including a temperature of 250° to 400° C., a hydrogen partial pressure of atmospheric to 15,000 kPa, and a liquid hourly space velocity of 0.1 to 10, to remove at least a portion of said sulfur and nitrogen compounds; (b) subjecting said hydrotreated feedstock to catalytic dewaxing by contacting said feedstock with a catalyst comprising zeolite beta having a silica/alumina ratio of at least 30:1 and a hydrogenation/dehydrogenation component under isomerization conditions, including a temperature of 200° to 540° C., a hydrogen pressure of atmospheric to 25,000 kPa, and a liquid hourly space velocity of 0.1 to 2.0, and wherein said isomerization conditions are sufficient to isomerize at least a portion of said normal paraffins and wherein a majority of normal paraffins converted are converted by isomerization.

Claim 18

Dependent Claim 182 words

A process for dewaxing a hydrocarbon feedstock containing at least 10 weight percent waxy paraffins selected from the group of normal paraffins and slightly branched paraffins and sulfur and nitrogen compounds which comprises (a) subjecting said feedstock to hydrotreating in a hydrotreating zone containing a Co-Mo or Ni-Mo on alumina catalyst operated at hydrotreating conditions including a temperature of 250° to 400° C., a hydrogen partial pressure of atmospheric to 15,000 kPa, and a liquid hourly space velocity of 0.1 to 10, to remove at least a portion of said sulfur and nitrogen compounds; (b) subjecting said hydrotreated feedstock to catalytic dewaxing by contacting said feedstock with a catalyst comprising zeolite beta having a silica/alumina ratio of at least 30:1 and a hydrogenation/dehydrogenation component under isomerization conditions, including a temperature of 200° to 540° C., a hydrogen pressure of atmospheric to 25,000 kPa, and a liquid hourly space velocity of 0.1 to 2.0, and wherein said isomerization conditions are sufficient to isomerize at least a portion of said normal paraffins and wherein a majority of normal paraffins converted are converted by isomerization.

Claim 19

Dependent Claim 15 words

Process of claim 16 in which the zeolite beta has a silica:alumina ratio over 100:1.

Claim 20

Dependent Claim 17 words

Process of claim 16 in which the zeolite beta has a silica:alumina ratio of at least 250:1.

Claim 21

Dependent Claim 23 words

Process of claim 16 in which the hydrogenation/dehydrogenation component comprises 0.1 to 5 weight percent on an elemental basis, of platinum or palladium.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-05-20	1988-11-19	1989-05-21	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-05-20	1992-11-19	1993-05-21	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-05-20	1996-11-19	1997-05-21	$7700.00	Window Closed / Lapsed

Hydrotreating/isomerization process to produce low pour point distillate fuels and lubricating oil stocks

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