Binderless zeolitic adsorbents

• US 11,033,879 B2
• Filed: 06/04/2018
• Issued: 06/15/2021
• Est. Priority Date: 12/29/2015
• Status: Active Grant

• Current Assignee: UOP Llc (Honeywell International Inc.)
• Original Assignee: UOP Llc (Honeywell International Inc.)
• Inventors: Cheng, Linda S., Lesch, David A.
• Primary Examiner(s): Johnson, Edward M
• Application Number:
  US15/997,600
• Publication Number:
  US 20180280926A1
• Time in Patent Office: 1,107 Days
• Field of Search: 502 79
• CPC Class Codes: B01J 20/183 Physical conditioning without chemical treatment, e.g. drying, granulating, coating, irradiation
• CPC Class Codes: B01J 20/186 Chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the activity, also decreasing the activity
• CPC Class Codes: B01J 20/3028 Granulating, agglomerating or aggregating
• CPC Class Codes: B01J 20/3042 Use of binding agents; addition of materials ameliorating the mechanical properties of the produced sorbent
• CPC Class Codes: B01J 20/3064 Addition of pore forming agents, e.g. pore inducing or porogenic agents
• CPC Class Codes: B01J 20/3078 Thermal treatment, e.g. calcining or pyrolizing
• CPC Class Codes: B01J 20/3085 Chemical treatments not covered by groups B01J20/3007 - B01J20/3078
• CPC Class Codes: C01B 39/20 Faujasite type, e.g. type X or Y
• CPC Class Codes: C01B 39/22 Type X C01B39/205 takes precedence
• CPC Class Codes: C07C 15/08 Xylenes
• CPC Class Codes: C07C 7/13 by molecular-sieve technique

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.

Claims

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.