EP0102716A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A process for isomerizing xylenes
Assignee: Mobil Oil AS
•
Filing: 1983-07-13
•
Granted: —
•
Expires: 2003-07-13
Abstract
Abstract A mixture of aromatic hydrocarbons, comprising xylenes, is isomerized in the presence of ZSM-22 zeolite to produce a product stream wherein the proportion of para-xylene is substantially equal to the equilibrium ratio of the para-isomer. The process is conducted at 500°F to 1100°F (260 to 593°C), at 0 to 3000 psig (101 to 20785 kPa), optionally in the presence of hydrogen, and also optionally with the catalyst comprising 0.005% to 5.0% of a metal, e.g., piatinum, palladium or cobalt, based on total catalyst weight.
Inventors
- 👤 David Harold Olson
- 👤 Robert Bruce Calvert
- 👤 Ernest William Valyocsik
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 22:04
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/2737; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/70; B01J29/7042; B01J29/72; B01J29/74; B01J29/7484; C01; C01B; C01B39/00; C01B39/02; C01B39/46; C01B39/48; C07C5/2754; B01J2229/00; B01J2229/10; B01J2229/22; B01J2229/30; B01J2229/36; B01J29/7284; B01J29/78; B01J29/7884; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
A process for isomerizing xylenes from a hydrocarbon mixture to produce a product stream comprising substantially an equilibrium mixture of para-xylene comprising contacting the hydrocarbon mixture with a catalyst comprising a ZSM-22 zeolite having a silica:alumina mole ratio of at least 20 and a Constraint Index of 2.6 at 800°F (427°C), and having the X-ray diffraction pattern of Table I.
Claim 2
Dependent Claim
60 words
A process for isomerizing xylenes from a hydrocarbon mixture to produce a product stream comprising substantially an equilibrium mixture of para-xylene comprising contacting the hydrocarbon mixture with a catalyst comprising a ZSM-22 zeolite having a silica:alumina mole ratio of at least 20 and a Constraint Index of 2.6 at 800°F (427°C), and having the X-ray diffraction pattern of Table I.
Claim 3
Dependent Claim
27 words
A process as claimed in claim 1 wherein hydrogen is admixed with the hydrocarbon mixture such that the hydrogen to hydrocarbon mole ratio is 0.1 to 10.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 2 wherein the hydrogen to hydrocarbon mole ratio is 0.5 to 5.0.
Claim 5
Dependent Claim
20 words
A process as claimed in any preceding claim wherein the acid activity of the as-synthesized ZSM-22 zeolite has been reduced.
Claim 6
Dependent Claim
23 words
A process as claimed in claim 4 wherein the acid activity of the ZSM-22 zeolite is 5 to 50 on the Alpha scale.
Claim 7
Dependent Claim
19 words
A process as claimed in any preceding claim wherein the catalyst comprises a Group VI6 or Group VIII metal.
Claim 8
Dependent Claim
23 words
A process as claimed in claim 6 wherein the metal is a noble metal of Group VIII of the Periodic Table of Elements.
Claim 9
Dependent Claim
14 words
A process as claimed in claim 7 wherein the metal is platinum or palladium.
Claim 10
Dependent Claim
33 words
A process as claimed in any one of claims 6 or 8 wherein the amount of metal in the catalyst is 0.005% by weight to 5.0% by weight, based on total catalyst weight.
Claim 11
Dependent Claim
36 words
A process as claimed in any preceding claim wherein the isomerization is conducted at the temperature of 500°F to 1100°F (260 to 593°C) and at a pressure of 0 to 3000 psig (101 to 20785 kPa).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.