Process for making modified small-crystal mordenite, transalkylation process using same, and modified small-crystal mordenite

Patent metadata

Field	Value
Publication number	US-10994266-B2
Application number	US-201916419271-A
Country	US
Kind code	B2
Filing date	May 22, 2019
Priority date	May 22, 2019
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A modified UZM-14 zeolite is described. The modified UZM-14 zeolite has a Modification Factor of 6 or more. The modified UZM-14 zeolite may have one or more of: a Si/Al 2 ratio of 14 to 30; a total pore volume in a range of 0.5 to 1.0 cc/g; at least 5% of a total pore volume being mesopores having a diameter of 10 nm of less; a cumulative pore volume of micropores and mesopores having a diameter of 100 Å or less of 0.25 cc/g or more; or a Collidine IR Bronsted acid site distribution greater than or equal to an area of 3/mg for a peak in a range of 1575 to 1700 cm −1 after desorption at 150° C. Processes of making the modified UZM-14 zeolite and transalkylation processes using the modified UZM-14 zeolite are also described.

First claim

What is claimed is:

1. A process for transalkylation of a feedstream comprising one or more of C 7 , C 9 , C 10 and C 11+ aromatics to obtain a product stream having an increased concentration of C 8 aromatics relative to that of the feedstream, comprising contacting the feedstream at transalkylation conditions with a catalyst comprising a modified UZM-14 zeolite having a Modification Factor of 6 or more, wherein the modified UZM-14 zeolite is made by steps:
(1) contacting a calcined UZM-14 zeolite with one or more of: nitric acid, or oxalic acid to form an acid washed UZM-14 zeolite;
(2) contacting the acid washed UZM-14 with one or more of: a sodium hydroxide solution, or a sodium bicarbonate solution to form a caustic washed UZM-14 zeolite; and
(3) ion exchanging the caustic washed zeolite to form the modified UZM-14 zeolite.

2. The process of claim 1 wherein the modified UZM-14 zeolite has one or more of:
a Si/Al 2 ratio of 14 to 30;
a total pore volume in a range of 0.5 to 1.0 cc/g;
at least 5% of a total pore volume are mesopores having a diameter of 10 nm of less;
a cumulative pore volume of micropores and mesopores having a diameter of 100 Å or less of 0.25 cc/g or more; or
a Collidine IR Bronsted acid site distribution greater than or equal to an area of 3/mg for a peak in a range of 1575 to 1700 cm −1 after desorption at 150° C.

3. The process of claim 1 wherein the feedstream further comprises benzene.

4. The process of claim 1 wherein the feedstream further comprises C 8 aromatics.

5. The process of claim 1 wherein the feedstream further comprises aromatic compounds having from 2 to 4 rings.

6. The process of claim 1 wherein the feedstream further comprises a bottoms stream from the fractionation of C 8 aromatics from the transalkylation product stream.

7. The process of claim 1 wherein the transalkylation conditions comprise one or more of: a temperature from about 200° C. to about 540° C., a pressure from about 100 kPa to about 6 MPa absolute, or a space velocity from about 0.1 to about 20 hr −1 .

8. The process of claim 1 wherein the catalyst further comprises an additional zeolitic component selected from one or
more of MFI, MEL, EUO, FER, MFS, MTT, MTW, TON and FAU.

9. The process of claim 1 wherein the catalyst further comprises a binder selected from one or more of alumina, silica and silica-alumina.

10. The process of claim 1 wherein the catalyst further comprises a metal component comprising one or more elements selected from groups VIB(6), VIIB(7), VIII(8-10) and IVA(14) of the Periodic Table.

Assignees

• Uop Llc

Inventors

• Abrams Martha Leigh
• Jeroro Eseoghene
• Moscoso Jaime G
• Jan Deng-Yang
• Cox Pelin

Classifications

• C07C15/08

  Xylenes · CPC title

• C07C6/126

  of more than one hydrocarbon · CPC title

• C07C2529/70

  of types characterised by their specific structure not provided for in groups C07C2529/08 - C07C2529/65 · CPC title

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title

• B01J2229/16

  to increase the Si/Al ratio; Dealumination · CPC title