US4428825A — Catalytic hydrodewaxing process with added ammoni…

Claim 1

Independent Claim 46 words

In the refining of lubricating oils, the improvement comprising catalytically hydrodewaxing a waxy hydrocarbon feedstock in the presence of a catalyst containing a crystalline dewaxing component and in the further presence of ammonia or ammonia precursors added in an amount above that native to the feedstock.

Claim 2

Dependent Claim 46 words

In the refining of lubricating oils, the improvement comprising catalytically hydrodewaxing a waxy hydrocarbon feedstock in the presence of a catalyst containing a crystalline dewaxing component and in the further presence of ammonia or ammonia precursors added in an amount above that native to the feedstock.

Claim 3

Dependent Claim 70 words

A process for upgrading a lubricating oil feedstock comprising contacting the feedstock with a hydrodewaxing catalyst containing a crystalline dewaxing component, under hydrodewaxing conditions including an elevated temperature and pressure and the presence of hydrogen, and in the presence of ammonia or ammonia precursors added in an amount above that native to the feedstock, so as to produce an oil product of improved lubrication properties and recovering said oil product.

Claim 4

Dependent Claim 70 words

A process for upgrading a lubricating oil feedstock comprising contacting the feedstock with a hydrodewaxing catalyst containing a crystalline dewaxing component, under hydrodewaxing conditions including an elevated temperature and pressure and the presence of hydrogen, and in the presence of ammonia or ammonia precursors added in an amount above that native to the feedstock, so as to produce an oil product of improved lubrication properties and recovering said oil product.

Claim 5

Dependent Claim 76 words

A process for upgrading a waxy oil feedstock comprising contacting the feedstock with a hydrodewaxing catalyst containing a crystalline dewaxing component, under hydrodewaxing conditions including an elevated temperature and pressure and the presence of hydrogen, and in the presence of ammonia or ammonia precursors added in an amount above that native to the feedstock, so as to produce a lubricating oil product of decreased pour point and increased viscosity index, and recovering said lubricating oil product.

Claim 6

Dependent Claim 76 words

A process for upgrading a waxy oil feedstock comprising contacting the feedstock with a hydrodewaxing catalyst containing a crystalline dewaxing component, under hydrodewaxing conditions including an elevated temperature and pressure and the presence of hydrogen, and in the presence of ammonia or ammonia precursors added in an amount above that native to the feedstock, so as to produce a lubricating oil product of decreased pour point and increased viscosity index, and recovering said lubricating oil product.

Claim 7

Dependent Claim 28 words

A process as defined in claim 2 or 3 wherein said hydrodewaxing catalyst comprises a dewaxing component selected from the group consisting of the ZSM-5 family of zeolites.

Claim 8

Dependent Claim 24 words

A process as defined in claim 2 or 3 wherein said hydrodewaxing catalyst comprises a catalytically active dewaxing component comprising a crystalline silica polymorph.

Claim 9

Dependent Claim 25 words

A process as defined in claim 5 wherein said crystalline silica polymorph has pores of openings of maximum cross-sectional dimension greater than about 5 Å.

Claim 10

Dependent Claim 21 words

A process as defined in claim 6 wherein said openings have a maximum cross-sectional dimension no greater than about 6 Å.

Claim 11

Dependent Claim 24 words

A process as defined in claim 5 wherein said crystalline silica polymorph is a silicalite having an X-ray powder diffraction pattern similar to ZSM-5.

Claim 12

Dependent Claim 20 words

A process as defined in claim 5 wherein said crystalline silica polymorph adsorbs benzene under ambient conditions but rejects neopentane.

Claim 13

Dependent Claim 34 words

A process as defined in claim 1, 2, or 3 wherein the weight feedrate of added ammonia and ammonia precursors calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.001.

Claim 14

Dependent Claim 31 words

A process as defined in claim 4 wherein the weight feedrate of added ammonia and ammonia precursors, calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.002.

Claim 15

Dependent Claim 31 words

A process as defined in claim 5 wherein the weight feedrate of added ammonia and ammonia precursors, calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.002.

Claim 16

Dependent Claim 31 words

A process as defined in claim 7 wherein the weight feedrate of added ammonia and ammonia precursors, calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.003.

Claim 17

Dependent Claim 31 words

A process as defined in claim 9 wherein the weight feedrate of added ammonia and ammonia precursors, calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.003.

Claim 18

Dependent Claim 32 words

A process as defined in claim 2 or 3 wherein said hydrodewaxing catalyst comprises a crystalline catalytically active dewaxing component having an X-ray powder diffraction pattern essentially the same as ZSM-5 zeolite.

Claim 19

Dependent Claim 136 words

A process for catalytically hydrodewaxing hydrocarbons comprising (1) contacting a waxy oil boiling primarily above 650° F. with a hydrodewaxing catalyst comprising a Group VIB metal component on a support comprising a silicalite, said silicalite containing less than about 0.75 weight percent of Group IIIA elements, calculated as the oxides thereof, with said contacting being at an elevated temperature and pressure, and in the presence of hydrogen and added ammonia or ammonia precursors, with the amount of said added ammonia or ammonia precursors being above that native to said waxy oil and (2) recovering a product lubricating oil from the products of said contacting, said lubricating oil being of substantially reduced pour point and of increased viscosity index in comparison to that portion of the waxy oil boiling in the same range as the lubricating oil.

Claim 20

Dependent Claim 136 words

A process for catalytically hydrodewaxing hydrocarbons comprising (1) contacting a waxy oil boiling primarily above 650° F. with a hydrodewaxing catalyst comprising a Group VIB metal component on a support comprising a silicalite, said silicalite containing less than about 0.75 weight percent of Group IIIA elements, calculated as the oxides thereof, with said contacting being at an elevated temperature and pressure, and in the presence of hydrogen and added ammonia or ammonia precursors, with the amount of said added ammonia or ammonia precursors being above that native to said waxy oil and (2) recovering a product lubricating oil from the products of said contacting, said lubricating oil being of substantially reduced pour point and of increased viscosity index in comparison to that portion of the waxy oil boiling in the same range as the lubricating oil.

Claim 21

Dependent Claim 28 words

A process as defined in claim 16 wherein the weight ratio of added ammonia and ammonia precursors, calculated as nitrogen, to the waxy oil is above about 0.004.

Claim 22

Dependent Claim 40 words

A process as defined in claim 16 wherein, in step (2), a recycle gas stream is recovered and recycled to step (1), and said recycle stream contains ammonia from previously added ammonia and from nitrogen native to the waxy oil.

Claim 23

Dependent Claim 41 words

A process as defined in claim 18 wherein the ratio of added, calculated as the weight feedrate of nitrogen in the added ammonia plus the recycled ammonia, to the weight feedrate of the waxy oil is maintained at a predetermined value.

Claim 24

Dependent Claim 29 words

A process as defined in claim 16, 17, 18 or 19 wherein said silicalite has an X-ray powder diffraction pattern and a pore structure essentially similar to ZSM-5 zeolite.

Claim 25

Dependent Claim 37 words

A process as defined in claim 16, 17, 18, or 19 wherein said catalyst comprises a Group VIB metal component and a Group VIII metal component on a support comprising said silicalite and a porous refractory oxide.

Claim 26

Dependent Claim 49 words

A process as defined in claim 1 wherein the catalytic hydrodewaxing is carried out in the presence of a catalyst comprising a Group VIB metal component and a Group VIII metal component on a support comprising a porous refractory oxide and a silica polymorph consisting essentially of crystalline silica.

Claim 27

Dependent Claim 13 words

A process as defined in claim 22 wherein said silica polymorph comprises silicalite.

Claim 28

Dependent Claim 42 words

A process as defined in claim 2 or 3 wherein said hydrodewaxing catalyst comprises a Group VIB metal component and a Group VIII metal component on a support comprising a porous refractory oxide and a silica polymorph consisting essentially of crystalline silica.

Claim 29

Dependent Claim 13 words

A process as defined in claim 24 wherein said silica polymorph comprises silicalite.

Claim 30

Dependent Claim 34 words

A process as defined in claim 22 or 23 wherein the total weight feedrate of added ammonia and ammonia precursors, calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.001.

Claim 31

Dependent Claim 34 words

A process as defined in claim 22 or 23 wherein the total weight feedrate of added ammonia and ammonia precursors, calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.002.

Claim 32

Dependent Claim 32 words

A process as defined in claim 24 wherein the total weight feedrate of added ammonia and ammonia precursors, calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.003.

Claim 33

Dependent Claim 34 words

A process as defined in claim 22 or 23 wherein the total weight feedrate of added ammonia and ammonia precursors, calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.004.

Claim 34

Dependent Claim 32 words

A process as defined in claim 25 wherein the total weight feedrate of added ammonia and ammonia precursors, calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.001.

Claim 35

Dependent Claim 37 words

In the refining of lubricating oils, the improvement comprising catalytically hydrodewaxing a substantial amount of a waxy hydrocarbon feedstock in the presence of ammonia or ammonia precursors added in an amount above that native to the feedstock.

Claim 36

Dependent Claim 37 words

In the refining of lubricating oils, the improvement comprising catalytically hydrodewaxing a substantial amount of a waxy hydrocarbon feedstock in the presence of ammonia or ammonia precursors added in an amount above that native to the feedstock.

Claim 37

Dependent Claim 63 words

A process for upgrading a lubricating oil feedstock comprising contacting the feedstock with a hydrodewaxing catalyst, under conditions producing substantial hydrodewaxing, including an elevated temperature and pressure and the presence of hydrogen, and in the presence of ammonia or ammonia precursors added in an amount above that native to the feedstock, and recovering an oil product of improved lubrication properties from said contacting.

Claim 38

Dependent Claim 63 words

A process for upgrading a lubricating oil feedstock comprising contacting the feedstock with a hydrodewaxing catalyst, under conditions producing substantial hydrodewaxing, including an elevated temperature and pressure and the presence of hydrogen, and in the presence of ammonia or ammonia precursors added in an amount above that native to the feedstock, and recovering an oil product of improved lubrication properties from said contacting.

Claim 39

Dependent Claim 68 words

A process for upgrading a waxy oil feedstock comprising contacting the feedstock with a hydrodewaxing catalyst, under conditions producing substantial hydrodewaxing, including an elevated temperature and pressure and the presence of hydrogen, and in the presence of ammonia or ammonia precursors added in an amount above that native to the feedstock, and recovering a lubricating oil product of decreased pour point and increased viscosity index from said contacting.

Claim 40

Dependent Claim 68 words

A process for upgrading a waxy oil feedstock comprising contacting the feedstock with a hydrodewaxing catalyst, under conditions producing substantial hydrodewaxing, including an elevated temperature and pressure and the presence of hydrogen, and in the presence of ammonia or ammonia precursors added in an amount above that native to the feedstock, and recovering a lubricating oil product of decreased pour point and increased viscosity index from said contacting.

Claim 41

Dependent Claim 35 words

A process as defined in claim 31, 32, or 33 wherein the total weight feedrate of added ammonia and ammonia precursors, calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.001.

Claim 42

Dependent Claim 35 words

A process as defined in claim 31, 32, or 33 wherein the total weight feedrate of added ammonia and ammonia precursors, calculated as nitrogen, to the weight feedrate of the feedstock is at least 0.004.

Claim 43

Dependent Claim 52 words

A process as defined in claim 31, 32, or 33 wherein said hydrodewaxing is carried out in the presence of a hydrodewaxing catalyst comprising a Group VIB metal component and a Group VIII metal component on a support comprising a porous refractory oxide and a silica polymorph consisting essentially of crystalline silica.

Claim 44

Dependent Claim 13 words

A process as defined in claim 36 wherein said silica polymorph comprises silicalite.

Claim 45

Dependent Claim 42 words

A process as defined in claim 35 wherein said hydrodewaxing is carried out in the presence of a hydrodewaxing catalyst comprising a Group VIB metal component and a Group VIII metal component on a support comprising a porous refractory oxide and silicalite.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-01-30	1987-08-01	1988-01-31	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-01-30	1991-08-01	1992-01-31	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-01-30	1995-08-01	1996-01-31	$7700.00	Window Closed / Lapsed

Catalytic hydrodewaxing process with added ammonia in the production of lubricating oils

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