US4743354A — Process for producing a product hydrocarbon havin…

Claim 1

Independent Claim 123 words

A process for converting a waxy hydrocarbon feedstock containing a substantial proportion of hydrocarbonaceous material boiling above about 650° F. into a product hydrocarbon having a reduced content of normal paraffins as compared to said feedstock which comprises: (a) contacting said waxy hydrocarbon feedstock with a dewaxing catalyst in a dewaxing zone under conditions such that the normal paraffin content of said feedstock is reduced; (b) contacting the effluent from said dewaxing zone with a hydrocracking catalyst in the presence of hydrogen in a hydrocracking zone under conditions such that a further reduction in the normal paraffin content of said feedstock is effected; and (c) recovering said product hydrocarbon having a reduced content of normal paraffins from the effluent of said hydrocracking zone.

Claim 2

Dependent Claim 123 words

A process for converting a waxy hydrocarbon feedstock containing a substantial proportion of hydrocarbonaceous material boiling above about 650° F. into a product hydrocarbon having a reduced content of normal paraffins as compared to said feedstock which comprises: (a) contacting said waxy hydrocarbon feedstock with a dewaxing catalyst in a dewaxing zone under conditions such that the normal paraffin content of said feedstock is reduced; (b) contacting the effluent from said dewaxing zone with a hydrocracking catalyst in the presence of hydrogen in a hydrocracking zone under conditions such that a further reduction in the normal paraffin content of said feedstock is effected; and (c) recovering said product hydrocarbon having a reduced content of normal paraffins from the effluent of said hydrocracking zone.

Claim 3

Dependent Claim 24 words

A process as defined by claim 1 wherein said dewaxing catalyst comprises a molecular sieve containing pores defined by 10-membered rings of oxygen atoms.

Claim 4

Dependent Claim 16 words

A process as defined by claim 2 wherein said dewaxing catalyst comprises a crystalline silica polymorph.

Claim 5

Dependent Claim 14 words

A process as defined by claim 3 wherein said dewaxing catalyst further comprises alumina.

Claim 6

Dependent Claim 13 words

A process as defined by claim 4 wherein said silica polymorph comprises silicalite.

Claim 7

Dependent Claim 47 words

A process as defined by claim 2 wherein said hydrocracking catalyst comprises at least one hydrogenation component selected from the group consisting of Group VIB metal components and Group VIII metal components on a porous, inorganic refractory oxide support comprising silica-alumina dispersed in a matrix of alumina.

Claim 8

Dependent Claim 13 words

A process as defined by claim 6 wherein said matrix comprises gamma alumina.

Claim 9

Dependent Claim 25 words

A process as defined by claim 7 wherein said hydrocracking catalyst comprises a Group VIB metal hydrogenation component and a Group VIII metal hydrogenation component.

Claim 10

Dependent Claim 35 words

A process as defined by claim 8 wherein said Group VIB metal hydrogenation component comprises a tungsten component or molybdenum component and said Group VIII metal hydrogenation component comprises a nickel component or cobalt component.

Claim 11

Dependent Claim 19 words

A process as defined by claim 2 wherein said dewaxing catalyst comprises a crystalline zeolite of the ZSM-5 family.

Claim 12

Dependent Claim 28 words

A process as defined by claim 10 wherein said zeolite of the ZSM-5 family is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35 and ZSM-38.

Claim 13

Dependent Claim 60 words

A process as defined by claim 2 wherein said hydrocracking catalyst comprises at least one hydrogenation component selected from the group consisting of Group VIB metal components and Group VIII metal components on a support comprising a crystalline aluminosilicate zeolite having catalytic activity for cracking hydrocarbons and a porous, inorganic refractory oxide comprising silica-alumina dispersed in a matrix of alumina.

Claim 14

Dependent Claim 13 words

A process as defined by claim 12 wherein said matrix comprises gamma alumina.

Claim 15

Dependent Claim 25 words

A process as defined by claim 13 wherein said hydrocracking catalyst comprises a Group VIB metal hydrogenation component and a Group VIII metal hydrogenation component.

Claim 16

Dependent Claim 36 words

A process as defined by claim 14 wherein said Group VIB metal hydrogenation component comprises a tungsten component or molybdenum component and said Group VIII metal hydrogenation component comprises a nickel component or a cobalt component.

Claim 17

Dependent Claim 56 words

A process as defined by claim 12 wherein said zeolite comprises a modified hydrogen crystalline aluminosilicate Y zeolite having a unit cell size between about 24.25 and about 24.35 Angstroms and a water adsorption capacity, at 4.6 mm Hg water vapor partial pressure and 25° C., less than about 8 percent by weight of said zeolite.

Claim 18

Dependent Claim 21 words

A process as defined by claim 2 wherein said dewaxing zone and said hydrocracking zone are maintained in the same reactor.

Claim 19

Dependent Claim 44 words

A process as defined by claim 2 wherein the effluent from said dewaxing zone is treated to remove liquids boiling below about 650° F., ammonia, hydrogen sulfide and light hydrocarbon gases, and the remaining portion of said effluent is passed to said hydrocracking zone.

Claim 20

Dependent Claim 32 words

A process as defined by claim 2 wherein substantially all of the effluent from said dewaxing zone is contacted with said hydrocracking catalyst in the presence of hydrogen in said hydrocracking zone.

Claim 21

Dependent Claim 51 words

A process as defined by claim 1 wherein said product hydrocarbon comprises a middle distillate and the contacting in steps (a) and (b) is such that the overall conversion of components comprising said feedstock to components boiling at or below about 300° F. is no more than about 25 volume percent.

Claim 22

Dependent Claim 58 words

A process as defined by claim 1 wherein said product hydrocarbon comprises a lube oil base stock and the contacting in steps (a) and (b) is such that the overall conversion of components in said feedstock boiling above about 650° F. to components boiling at or below about 650° F. is no more than about 20 volume percent.

Claim 23

Dependent Claim 162 words

A process for converting a waxy hydrocarbon feedstock containing a substantial proportion of hydrocarbonaceous material boiling above about 650° F. into a middle distillate having a reduced content of normal paraffins as compared to said feedstock which comprises: (a) contacting said waxy hydrocarbon feedstock in the presence of hydrogen with a hydrodewaxing catalyst in a hydrodewaxing zone under conditions such that the normal paraffin content of said feedstock is reduced; (b) contacting the effluent from said hydrodewaxing zone with a hydrocracking catalyst in the presence of hydrogen in a hydrocracking zone under conditions such that a further reduction in the normal paraffin content of said feedstock is effected, wherein said contacting in steps (a) and (b) is such that the overall conversion of components comprising said feedstock to components boiling at or below about 300° F. is no more than about 25 volume percent; and (c) recovering said middle distillate of reduced normal paraffin content from the effluent of said hydrocracking zone.

Claim 24

Dependent Claim 162 words

A process for converting a waxy hydrocarbon feedstock containing a substantial proportion of hydrocarbonaceous material boiling above about 650° F. into a middle distillate having a reduced content of normal paraffins as compared to said feedstock which comprises: (a) contacting said waxy hydrocarbon feedstock in the presence of hydrogen with a hydrodewaxing catalyst in a hydrodewaxing zone under conditions such that the normal paraffin content of said feedstock is reduced; (b) contacting the effluent from said hydrodewaxing zone with a hydrocracking catalyst in the presence of hydrogen in a hydrocracking zone under conditions such that a further reduction in the normal paraffin content of said feedstock is effected, wherein said contacting in steps (a) and (b) is such that the overall conversion of components comprising said feedstock to components boiling at or below about 300° F. is no more than about 25 volume percent; and (c) recovering said middle distillate of reduced normal paraffin content from the effluent of said hydrocracking zone.

Claim 25

Dependent Claim 24 words

A process as defined by claim 22 wherein said hydrodewaxing catalyst comprising a molecular sieve containing pores defined by 10-membered rings of oxygen atoms.

Claim 26

Dependent Claim 15 words

A process as defined by claim 23 wherein said molecular sieve comprises silicalite or ZSM-5.

Claim 27

Dependent Claim 33 words

A process as defined by claim 24 wherein said hydrodewaxing catalyst further comprises at least one hydrogenation component selected from the group consisting of Group VIB metal components and Group VIII metal components.

Claim 28

Dependent Claim 25 words

A process as defined by claim 25 wherein said hydrodewaxing catalyst comprises a Group VIB metal hydrogenation component and a Group VIII metal hydrogenation component.

Claim 29

Dependent Claim 19 words

A process as defined by claim 26 wherein said hydrocracking catalyst comprises silica-alumina dispered in a matrix of alumina.

Claim 30

Dependent Claim 16 words

A process as defined by claim 27 wherein said hydrocracking catalyst further comprises a Y zeolite.

Claim 31

Dependent Claim 14 words

A process as defined by claim 28 wherein said Y zeolite comprises LZ-10 zeolite.

Claim 32

Dependent Claim 15 words

A process as defined by claim 22 wherein said middle distillate comprises a jet fuel.

Claim 33

Dependent Claim 18 words

A process as defined by claim 22 wherein said middle distillate comprises a diesel fuel or heating oil.

Claim 34

Dependent Claim 17 words

A process as defined by claim 22 wherein said waxy hydrocarbon feedstock comprises a waxy gas oil.

Claim 35

Dependent Claim 165 words

A process for converting a waxy hydrocarbon feedstock containing a substantial proportion of hydrocarbonaceous material boiling above about 650° F. into a lube oil base stock having a reduced pour point as compared to said feedstock which comprises: (a) contacting said waxy hydrocarbon feedstock in the presence of hydrogen with a hydrodewaxing catalyst in a hydrodewaxing zone under conditions such that the pour point of said feedstock is reduced; (b) contacting the effluent from said hydrodewaxing zone with a hydrocracking catalyst in the presence of hydrogen in a hydrocracking zone under conditions such that a further reduction in pour point of said feedstock is effected, wherein said contacting in steps (a) and (b) is such that the overall conversion of components in said feedstock boiling above about 650° F. to components boiling at or below about 650° F. is no more than about 20 volume percent; and (c) recovering said lube oil base stock of reduced pour point from the effluent of said hydrocracking zone.

Claim 36

Dependent Claim 165 words

A process for converting a waxy hydrocarbon feedstock containing a substantial proportion of hydrocarbonaceous material boiling above about 650° F. into a lube oil base stock having a reduced pour point as compared to said feedstock which comprises: (a) contacting said waxy hydrocarbon feedstock in the presence of hydrogen with a hydrodewaxing catalyst in a hydrodewaxing zone under conditions such that the pour point of said feedstock is reduced; (b) contacting the effluent from said hydrodewaxing zone with a hydrocracking catalyst in the presence of hydrogen in a hydrocracking zone under conditions such that a further reduction in pour point of said feedstock is effected, wherein said contacting in steps (a) and (b) is such that the overall conversion of components in said feedstock boiling above about 650° F. to components boiling at or below about 650° F. is no more than about 20 volume percent; and (c) recovering said lube oil base stock of reduced pour point from the effluent of said hydrocracking zone.

Claim 37

Dependent Claim 24 words

A process as defined by claim 33 wherein said hydrodewaxing catalyst comprising a molecular sieve containing pores defined by 10-membered rings of oxygen atoms.

Claim 38

Dependent Claim 15 words

A process as defined by claim 34 wherein said molecular sieve comprises silicalite or ZSM-5.

Claim 39

Dependent Claim 19 words

A process as defined by claim 35 wherein said hydrocracking catalyst comprises silica-alumina dispered in a matrix of alumina.

Claim 40

Dependent Claim 16 words

A process as defined by claim 36 wherein said hydrocracking catalyst further comprises a Y zeolite.

Claim 41

Dependent Claim 14 words

A process as defined by claim 37 wherein said Y zeolite comprises LZ-10 zeolite.

Claim 42

Dependent Claim 26 words

A process as defined by claim 35 wherein said hydrodewaxing catalyst further comprises a tungsten component or molybdenum component and a nickel component or cobalt component.

Claim 43

Dependent Claim 27 words

A process as defined by claim 33 wherein said waxy hydrocarbon feedstock comprises a dearsenated shale oil which has been hydrotreated to remove organonitrogen and organosulfur components.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-05-10	1991-11-09	1992-05-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-05-10	1995-11-09	1996-05-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-05-10	1999-11-09	2000-05-10	$7700.00	Window Closed / Lapsed

Process for producing a product hydrocarbon having a reduced content of normal paraffins

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