# US 10,479,742 B2 · Liquid phase xylene isomerization in the absence of hydrogen

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- Number: US 10,479,742 B2
- Document ID: US10479742B2
- Status: Granted
- Kind: B2
- Application number: 15/487,354
- Filed: 2017-04-13
- Published: 2017-10-19
- Granted: 2019-11-19
- Earliest claimed: 2016-04-14
- Assignees: Uop LLC
- Applicants: Uop LLC
- Inventors: Ashish Suresh Bambal; Gregory B. Kuzmanich; Patrick C. Whitchurch
- Web page: https://patentgrep.com/patent/US10479742B2

## CPC

- C07C 5/2775: {with crystalline alumino-silicates, e.g. molecular sieves}
- C07C 5/2737: {with crystalline alumino-silicates, e.g. molecular sieves}
- C07C 2529/40: of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11
- C07C 2529/70: of types characterised by their specific structure not provided for in groups C07C2529/08 - C07C2529/65
- Y02P 20/52: using catalysts, e.g. selective catalysts
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The field of this claimed subject matter generally relates to liquid phase isomerization technology. More specification, the field relates to liquid phase isomerization in complete absence of hydrogen which eliminates the need for gas-liquid separation at the reactor outlet. Even in the absence of the hydrogen, the catalyst demonstrates a stable isomerization performance with a paraxylene to xylene ratio of about 23 wt % in the product stream.

## Claims

### Claim 1

A process for the isomerization of an alkylaromatic feed mixture, comprising contacting the alkylaromatic feed mixture in a C8 isomerization zone, wherein the C8 isomerization zone comprises an isomerization stage wherein the alkylaromatic feed mixture contacts a catalyst comprising a UZM-54 zeolite, alumina, and an absence of metals, at isomerization conditions in a liquid phase in the complete absence of hydrogen to produce a product stream.

### Claim 2 (depends on 1)

The process of claim 1, wherein the catalyst contains about 50% to about 50% to about 90% UZM-54 zeolite by weight.

### Claim 3 (depends on 1)

The process of claim 1, wherein the catalyst contains about 70% UZM-54 zeolite by weight.

### Claim 4 (depends on 1)

The process of claim 1, wherein the isomerization conditions include a temperature of about 200° C. to about 320° C.

### Claim 5 (depends on 1)

The process of claim 1, wherein the isomerization conditions include a pressure sufficient to maintain the alkylaromatics feed mixture in liquid phase.

### Claim 6 (depends on 1)

The process of claim 1, wherein the isomerization conditions include a weight hourly space velocity of about 1 hr−1 to about 15 hr−1.

### Claim 7 (depends on 1)

The process of claim 1, wherein the product stream comprises a paraxylene to xylene ratio of about 20 wt % to about 24 wt %.

### Claim 8 (depends on 1)

The process of claim 1, wherein the product stream comprises a paraxylene to xylene ratio of about 23 wt %.