Binderless zeolitic adsorbents

Patent metadata

Field	Value
Publication number	US-11033879-B2
Application number	US-201815997600-A
Country	US
Kind code	B2
Filing date	Jun 4, 2018
Priority date	Dec 29, 2015
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

FAU type binderless zeolitic adsorbents and methods for making the FAU type binderless adsorbents are described. The binderless zeolitic adsorbent comprises a first FAU type zeolite having a silica to alumina molar ratio below 3.0; a binder-converted FAU type zeolite having a silica to alumina molar ratio of from about 2.5 to about 6.0, wherein the binder-converted FAU type zeolite may be 5-50% of the binderless zeolitic adsorbent; and cationic exchangeable sites within the binderless zeolitic adsorbent. The FAU type binderless adsorbents may be used for xylene separation and purification in selective adsorptive separation processes using binderless zeolitic adsorbents.

First claim

The invention claimed is:

1. A binderless zeolitic adsorbent comprising:
a first FAU type zeolite having a silica to alumina molar ratio below 3.0, wherein the first FAU type zeolite is Zeolite X;
a binder-converted FAU type zeolite having a silica to alumina molar ratio of from about 3.0 to about 6.0, wherein the binder-converted FAU type zeolite is Zeolite Y, and wherein the binder-converted FAU type zeolite is 5-50% of the binderless zeolitic adsorbent; and
cationic exchangeable sites within the binderless zeolitic adsorbent.

2. The binderless zeolitic adsorbent of claim 1 , wherein at least 95% of the binderless zeolitic adsorbent is FAU type zeolite.

3. The binderless zeolitic adsorbent of claim 1 , wherein at least 98% of the binderless zeolitic adsorbent is FAU type zeolite.

4. The binderless zeolitic adsorbent of claim 1 , wherein the cationic exchangeable sites may be alkali/alkaline earth cations.

5. The binderless zeolitic adsorbent of claim 1 , wherein the cationic exchangeable sites may be barium, potassium, sodium, or any combination of barium, potassium, or sodium.

6. The binderless zeolitic adsorbent of claim 1 , wherein the non-zeolitic binder comprises silica, alumina, or a combination of silica and alumina.

7. The binderless zeolitic adsorbent of claim 1 , wherein the first FAU type zeolite is about 80 to about 90% of the binderless zeolitic adsorbent, and wherein binder-converted FAU type zeolite is about 10 to about 20% of the binderless zeolitic adsorbent.

Assignees

• Uop Llc

Inventors

• Cheng Linda S
• Lesch David A

Classifications

• B01J20/3064

  Addition of pore forming agents, e.g. pore inducing or porogenic agents · CPC title

• C01B39/20

  Faujasite type, e.g. type X or Y · CPC title

• B01J20/183

  Physical conditioning without chemical treatment, e.g. drying, granulating, coating, irradiation · CPC title

• B01J20/3085

  Chemical treatments not covered by groups B01J20/3007 - B01J20/3078 · CPC title

• C07C7/13

  by molecular-sieve technique · CPC title