US5463155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Upgrading of cyclic naphthas
Assignee: Honeywell UOP LLC
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Filing: 1993-11-15
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Granted: 1995-10-31
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Expires: 2013-11-15
Abstract
Abstract A process combination is disclosed to selectively upgrade naphtha to obtain an isoparaffin-rich product for blending into gasoline. A naphtha feedstock is subjected to ring cleavage to convert naphthenes to paraffins using a nonacidic catalyst followed by isomerization of paraffins to obtain an increased proportion of isoparaffins.
Inventors
- 👤 Leonid B. Galperin
- 👤 Jeffery C. Bricker
- 👤 Jennifer S. Holmgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:00
CPC Classifications
C; C10; C10G; C10G59/00; C10G59/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
179 words
A process combination for selectively upgrading a naphtha feedstock to obtain a product having an increased isoparaffin content comprising the steps of: (a) contacting the naphtha feedstock in a ring-cleavage zone with a nonacidic ring-cleavage catalyst, comprising at least one platinum-group metal component and a support selected from the group consisting of a nonacidic alumina, a metal-oxide solid solution and a nonacidic large-pore molecular sieve, at cleavage conditions comprising a temperature of from 100° to 550° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.1 to 30 hr -1 to convert about 60% or more of the naphthenes in the feedstock by selective ring opening and produce a paraffinic intermediate; and, (b) converting the paraffinic intermediate in an isomerization zone maintained at isomerization conditions comprising a temperature of from 40° to 250° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.2 to 15 hr -1 with a solid acid isomerization catalyst comprising at least one platinum-group metal component and recovering an isoparaffin-rich product.
Claim 2
Dependent Claim
179 words
A process combination for selectively upgrading a naphtha feedstock to obtain a product having an increased isoparaffin content comprising the steps of: (a) contacting the naphtha feedstock in a ring-cleavage zone with a nonacidic ring-cleavage catalyst, comprising at least one platinum-group metal component and a support selected from the group consisting of a nonacidic alumina, a metal-oxide solid solution and a nonacidic large-pore molecular sieve, at cleavage conditions comprising a temperature of from 100° to 550° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.1 to 30 hr -1 to convert about 60% or more of the naphthenes in the feedstock by selective ring opening and produce a paraffinic intermediate; and, (b) converting the paraffinic intermediate in an isomerization zone maintained at isomerization conditions comprising a temperature of from 40° to 250° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.2 to 15 hr -1 with a solid acid isomerization catalyst comprising at least one platinum-group metal component and recovering an isoparaffin-rich product.
Claim 3
Dependent Claim
43 words
The process combination of claim 1 wherein hydrogen is present in one or both of the ring-cleavage zone and the isomerization zone in an amount of from about 0.01 to 100 moles per mole of C 5 + hydrocarbons present in the zone.
Claim 4
Dependent Claim
27 words
The process combination of claim 2 wherein the paraffinic intermediate is transferred from the ring-cleavage zone to the isomerization zone without separation of hydrogen or light hydrocarbons.
Claim 5
Dependent Claim
18 words
The process combination of claim 1 wherein ring-cleavage selectivity to paraffins is at least about 90 mass %.
Claim 6
Dependent Claim
18 words
The process combination of claim 1 wherein the platinum-group metal component of step (a) comprises a platinum component.
Claim 7
Dependent Claim
18 words
The process combination of claim 1 wherein the support of step (a) consists essentially of a nonacidic alumina.
Claim 8
Dependent Claim
12 words
The process combination of claim 6 wherein the support comprises potassium-exchanged alumina.
Claim 9
Dependent Claim
17 words
The process combination of claim 1 wherein the support of step (a) comprises a metal-oxide solid solution.
Claim 10
Dependent Claim
15 words
The process combination of claim 1 wherein the support of step (a) comprises nonacidic L-zeolite.
Claim 11
Dependent Claim
32 words
The process combination of claim 1 wherein the ring-cleavage catalyst comprises a metal modifier selected from one or more of the group consisting of rhenium, germanium, tin, lead, gallium, indium and bismuth.
Claim 12
Dependent Claim
19 words
The process combination of claim 1 wherein the isomerization catalyst comprises a platinum-group metal component on a chlorided inorganic-oxide.
Claim 13
Dependent Claim
18 words
The process combination of claim 10 wherein the platinum-group metal component of step (b) comprises a platinum component.
Claim 14
Dependent Claim
15 words
The process combination of claim 10 wherein the isomerization catalyst comprises a Friedel-Crafts metal halide.
Claim 15
Dependent Claim
26 words
The process combination of claim 1 wherein step (a) comprises separation and recycle of a cyclics concentrate to ring cleavage and production of an isoparaffin concentrate.
Claim 16
Dependent Claim
21 words
The process combination of claim 1 further comprising blending a gasoline component comprising at least a portion of the isoparaffin-rich product.
Claim 17
Dependent Claim
174 words
A process combination for selectively upgrading a naphtha feedstock to obtain a product having an increased isoparaffin content comprising the steps of: (a) contacting the naphtha feedstock in a ring-cleavage zone with a nonacidic ring-cleavage catalyst, comprising at least one platinum-group metal component and a support consisting essentially of a nonacidic alumina, at cleavage conditions comprising a temperature of from 100° to 550° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.1 to 30 hr -1 to convert about 60% or more of the naphthenes in the feedstock by selective ring opening and produce a paraffinic intermediate; and, (b) converting the paraffinic intermediate from the ring-cleavage zone without separation of hydrogen in an isomerization zone maintained at isomerization conditions comprising a temperature of from 40° to 250° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.2 to 15 hr -1 with a solid acid isomerization catalyst comprising at least one platinum-group metal component and recovering an isoparaffin-rich product.
Claim 18
Dependent Claim
174 words
A process combination for selectively upgrading a naphtha feedstock to obtain a product having an increased isoparaffin content comprising the steps of: (a) contacting the naphtha feedstock in a ring-cleavage zone with a nonacidic ring-cleavage catalyst, comprising at least one platinum-group metal component and a support consisting essentially of a nonacidic alumina, at cleavage conditions comprising a temperature of from 100° to 550° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.1 to 30 hr -1 to convert about 60% or more of the naphthenes in the feedstock by selective ring opening and produce a paraffinic intermediate; and, (b) converting the paraffinic intermediate from the ring-cleavage zone without separation of hydrogen in an isomerization zone maintained at isomerization conditions comprising a temperature of from 40° to 250° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.2 to 15 hr -1 with a solid acid isomerization catalyst comprising at least one platinum-group metal component and recovering an isoparaffin-rich product.
Claim 19
Dependent Claim
159 words
A process combination for selectively upgrading a naphtha feedstock to obtain a product having an increased isoparaffin content comprising the steps of: (a) contacting the naphtha feedstock in a ring-cleavage zone with a nonacidic ring-cleavage catalyst, comprising at least one platinum-group metal component and a support consisting essentially of a metal-oxide solid solution, at cleavage conditions comprising a temperature of from 100° to 550° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.1 to 30 hr -1 to produce a paraffinic intermediate; and, (b) converting the paraffinic intermediate from the ring-cleavage zone without separation of hydrogen in an isomerization zone maintained at isomerization conditions comprising a temperature of from 40° to 250° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.2 to 15 hr -1 with a solid acid isomerization catalyst comprising at least one platinum-group metal component and recovering an isoparaffin-rich product.
Claim 20
Dependent Claim
159 words
A process combination for selectively upgrading a naphtha feedstock to obtain a product having an increased isoparaffin content comprising the steps of: (a) contacting the naphtha feedstock in a ring-cleavage zone with a nonacidic ring-cleavage catalyst, comprising at least one platinum-group metal component and a support consisting essentially of a metal-oxide solid solution, at cleavage conditions comprising a temperature of from 100° to 550° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.1 to 30 hr -1 to produce a paraffinic intermediate; and, (b) converting the paraffinic intermediate from the ring-cleavage zone without separation of hydrogen in an isomerization zone maintained at isomerization conditions comprising a temperature of from 40° to 250° C., pressure of from 100 kPa to 10 MPa and liquid hourly space velocity of from 0.2 to 15 hr -1 with a solid acid isomerization catalyst comprising at least one platinum-group metal component and recovering an isoparaffin-rich product.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-10-30 | 1999-05-01 | 1999-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-30 | 2003-05-01 | 2003-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-30 | 2007-05-01 | 2007-10-31 | $7700.00 | Window Closed / Lapsed |