Granted Patent B2

US 12,528,069 · App. 18/670,008 · Granted Jan 20, 2026

Inventors: Billy-Paul M. Holbrook (North Charleston, SC); Laurence H. Hiltzik (North Charleston, SC); Robert W. Mims (North Charleston, SC); Rey P. Bongalonta (North Charleston, SC); Kenechukwu Onubogu (North Charleston, SC)

Assignee: INGEVITY SOUTH CAROLINA, LLC

B01J20/20B01J20/28011B01J20/28042B01J20/28083B01J20/3035F17C11/007F17C2201/0104F17C2201/0128F17C2221/033F17C2223/035

Abstract

Claims (45)

1 . A method of isolating methane from a biogas, the method comprising:

contacting biogas with a porous gas sorbent material having:

<about 100 cc/L volume in pores smaller than about 9 Å size;

>about 200 cc/L volume in pores about 9-27 Å size; and

>about 50 cc/L volume in pores about 27-490 Å size, wherein the porous gas sorbent material isolates methane from the biogas.

2 . The method of claim 1 , wherein the porous gas sorbent material comprises a gas adsorbing material and a non-aqueous binder.

3 . The method of claim 2 , wherein the non-aqueous binder is at least one of a fluoropolymer, a polyamide, a polyimide, fibrillated cellulose, a high-performance plastic, a copolymer with a fluoropolymer, a copolymer with a polyamide, a copolymer with a polyimide, a copolymer with a high-performance plastic, and a combination thereof.

4 . The method of claim 3 , wherein the fluoropolymer is at least one of poly(vinylidene difluoride), polytetrafluoroethylene, fluorinated ethylene propylene, perfluoroalkoxy alkane, or a combination thereof.

5 . The method of claim 3 , wherein the polyamide is at least one of Nylon-6,6′, Nylon-6, Nylon 6, 12, or a combination thereof.

6 . The method of claim 2 , wherein at least one of:

the non-aqueous binder is present in an amount of no greater than 10 wt %;

the gas sorbent material is present in an amount of at least 90 wt %;

the non-aqueous binder is a dispersion of about 50 wt % to about 70 wt % of the binder; or

a combination thereof.

7 . The method of claim 2 , wherein at least one of:

the non-aqueous binder is present in an amount of about 2.5 wt % to about 7 wt %;

the gas sorbent material is present in an amount of at least 93 wt %;

the non-aqueous binder is a dispersion of about 55 wt % to about 65 wt % of the binder; or

a combination thereof.

8 . The method of claim 1 , wherein the gas sorbent material is at least one of activated carbon, zeolite, silica, metal organic framework, covalent organic framework, or a combination thereof.

9 . The method of claim 8 , wherein the activated carbon is derived from wood, peat moss, coconut shell, coal, walnut shell, synthetic polymers, and/or natural polymers.

10 . The method of claim 1 , wherein the method further includes a step of desorbing the biogas.

11 . A methane storage and release system comprising:

a container having a gas inlet for receiving a gas stream comprising methane, and an outlet for delivering desorbed methane; and

a porous gas sorbent material disposed therein, wherein the porous gas sorbent material includes:

<about 100 cc/L volume in pores smaller than about 9 Å size;

>about 200 cc/L volume in pores about 9-27 Å size; and

>about 50 cc/L volume in pores about 27-490 Å size, wherein the porous gas sorbent material reversibly adsorbs methane from the gas stream.

12 . The system of claim 11 , wherein the porous gas sorbent material further comprises a non-aqueous binder.

13 . The system of claim 12 , wherein the porous gas sorbent material has at least one of the following:

(i) the non-aqueous binder is at least one of a fluoropolymer, a polyamide, a polyimide, fibrillated cellulose, a high-performance plastic, a copolymer with a fluoropolymer, a copolymer with a polyamide, a copolymer with a polyimide, a copolymer with a high-performance plastic, or a combination thereof;

(ii) the gas sorbent material is at least one of activated carbon, a zeolite, a silica, a metal organic framework, covalent organic framework, or a combination thereof; or

(iii) a combination thereof.

14 . The system of claim 11 , wherein the porous gas sorbent material has at least one of the following:

the gas adsorbing material is present in an amount of at least 90 wt %;

the non-aqueous binder is present in an amount no greater than 10 wt %;

the non-aqueous binder is a dispersion of about 50 wt % to about 70 wt % of the binder;

or

a combination thereof.

15 . The system of claim 11 , wherein the porous gas sorbent material has at least one of the following:

the gas sorbent material is present in an amount of at least 93 wt %;

the non-aqueous binder is present in an amount no greater than 7 wt %;

the non-aqueous binder is a dispersion of about 55 wt % to about 65 wt % of the binder;

or

a combination thereof.

Assignments (3)

Continuity (8)

References Cited (110)