Boron-selectivated molecular sieves and their use in sorptive separations

Patent metadata

Field	Value
Publication number	US-2016167013-A1
Application number	US-201514945516-A
Country	US
Kind code	A1
Filing date	Nov 19, 2015
Priority date	Dec 15, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

A composition is described comprising a molecular sieve having pores defined by channels formed by one or more 8-membered rings of tetrahedrally coordinated atoms, such as a DDR-type molecular sieve, and an amorphous deposit of a boron compound on the molecular sieve.

First claim

What is claimed is:

1 . A composition comprising a molecular sieve having pores defined by channels formed by one or more 8-membered rings of tetrahedrally coordinated atoms and an amorphous deposit of a boron compound on the molecular sieve.

2 . The composition of claim 1 , wherein the molecular sieve is a DDR-type molecular sieve.

3 . The composition of claim 1 , wherein the molecular sieve is ZSM-58.

4 . The composition of claim 1 , wherein the molecular sieve has a silica to alumina molar ratio in excess of 100.

5 . The composition of claim 1 , comprising from 10 wppm to 10000 wppm elemental boron.

6 . The composition of claim 1 , comprising from 500 wppm to 5000 wppm elemental boron.

7 . The composition of claim 1 , comprising from 1000 wppm to 1300 wppm elemental boron.

8 . The composition of claim 1 , wherein the amorphous deposit is produced by treating the molecular sieve with a boron-containing compound and then heating the treated molecular sieve at a temperature of at least 500° C.

9 . A composition comprising a DDR-type molecular sieve and an amorphous deposit of a boron compound on the molecular sieve.

10 . The composition of claim 9 , wherein the DDR-type molecular sieve has a silica to alumina molar ratio in excess of 100.

11 . The composition of claim 9 , comprising from 10 wppm to 10000 wppm elemental boron.

12 . The composition of claim 9 , comprising from 500 wppm to 5000 wppm elemental boron.

13 . The composition of claim 9 , comprising from 1000 wppm to 1300 wppm elemental boron.

14 . The composition of claim 9 , wherein the amorphous deposit is produced by treating the molecular sieve with a boron-containing compound and then heating the treated molecular sieve at a temperature of at least 500° C.

15 . The composition of claim 9 , having a methane diffusivity of less than about 10E-13 m 2 /sec at a temperature of about 30° C. and about 0.17 bar (about 17 kPa) methane partial pressure

16 . A DDR-type molecular sieve having a methane diffusivity of less than about 10E-13 m 2 /sec at a temperature of about 30° C. and about 0.17 bar (about 17 kPa) methane partial pressure.

17 . The molecular sieve of claim 16 , comprising an amorphous deposit of a boron compound.

18 . A method for performing a gas separation comprising: contacting the composition of claim 1 with an input gas stream containing a first component and a second component to form a product gas stream enriched in the first component relative to the input gas stream.

19 . The method of claim 18 , wherein the first component is CH 4 and the second component is CO 2 , N 2 , H 2 S, or a combination thereof.

20 . A method for performing a gas separation comprising: contacting the composition of claim 9 with an input gas stream containing a first component and a second component to form a product gas stream enriched in the first component relative to the input gas stream.

21 . The method of claim 20 , wherein the first component is CH 4 and the second component is CO 2 , N 2 , H 2 S, or a combination thereof

22 . A method for performing a gas separation comprising: contacting the molecular sieve of claim 16 with an input gas stream containing a first component and a second component to form a product gas stream enriched in the first component relative to the input gas stream.

23 . The method of claim 22 , wherein the first component is CH 4 and the second component is CO 2 , N 2 , H 2 S, or a combination thereof.

Assignees

• Beeckman Jean W
• Johnson Ivy D
• Fassbender Natalie A
• Beutel Tilman W
• Hrycenko Nadya A
• Smiley Randolph J
• Ravikovitch Peter I
• Exxonmobil Res & Eng Co

Inventors

• Beeckman Jean W
• Johnson Ivy D
• Fassbender Natalie A
• Beutel Tilman W
• Hrycenko Nadya A
• Smiley Randolph J
• Ravikovitch Peter I

Classifications

• B01D2257/504

  Carbon dioxide · CPC title

• B01D2256/245

  Methane · CPC title

• B01D2257/40

  Nitrogen compounds · CPC title

• B01J20/18 Primary

  Synthetic zeolitic molecular sieves · CPC title

• B01D2257/304

  Hydrogen sulfide · CPC title