# US 12,600,896 B2 · Lignin-based compositions and related hydrocarbon recovery methods

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- Number: US 12,600,896 B2
- Document ID: US12600896B2
- Status: Granted
- Kind: B2
- Application number: 18/285,702
- Filed: 2022-04-05
- Published: 2024-06-20
- Granted: 2026-04-14
- Earliest claimed: 2021-04-06
- Assignees: LignoSol IP Limited
- Applicants: LignoSol IP Limited
- Inventors: Desmond Alexander Somerville; Patrick Dieter Waibel
- Web page: https://patentgrep.com/patent/US12600896B2

## CPC

- C07G 1/00: Low-molecular-weight derivatives of lignin (high-molecular-weight derivatives of lignin {C08H6/00})
- C09K 8/582: characterised by the use of bacteria
- C09K 8/584: characterised by the use of specific surfactants
- C09K 8/588: characterised by the use of specific polymers {(polymeric surfactants C09K8/584)}
- C09K 2208/10: Nanoparticle-containing well treatment fluids
- C07G: COMPOUNDS OF UNKNOWN CONSTITUTION (sulfonated fats, oils or waxes of undetermined constitution C07C309/62)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

Compositions are provided for hydrocarbon recovery applications. In some embodiments, the composition comprises lignin, in particular technical lignin, and at least one strain of bacteria capable of biosurfactant production and/or a biosurfactant produced by at least one such isolated strain of bacteria. Also provided is a method for recovering hydrocarbon from a subterranean reservoir.

## Claims

### Claim 1

A method for recovering hydrocarbons from a hydrocarbon source, the method comprising:
a) providing a hydrocarbon recovery composition comprising i) lignin and ii) at least one isolated strain of bacteria capable of producing at least one biosurfactant and/or at least one biosurfactant produced from the at least one bacteria, wherein the lignin comprises lignin particles, wherein at least 20% of the lignin particles are lignin nanoparticles, and wherein the composition has a solids content of about 50% or above;
b) contacting the hydrocarbon source with the composition; and
c) recovering at least a portion of the contacted hydrocarbons.

### Claim 2 (depends on 1)

The method of claim 1, wherein the method is for enhanced oil recovery (EOR).

### Claim 3 (depends on 1)

The method of claim 1, wherein the lignin comprises at least one of lignin nanoparticles and lignin microparticles.

### Claim 4 (depends on 1)

The method of claim 1, wherein the composition further comprises a catholyte solution.

### Claim 5 (depends on 4)

The method of claim 4, wherein the catholyte solution is a stabilized or enhanced catholyte solution.

### Claim 6

A method for recovering hydrocarbons from a hydrocarbon source, the method comprising:
a) injecting a pre-treatment fluid comprising at least 50% pyroligneous acid into the hydrocarbon source;
b) contacting the hydrocarbon source with a hydrocarbon recovery composition comprising i) lignin and ii) at least one isolated strain of bacteria capable of producing at least one biosurfactant and/or at least one biosurfactant produced from the at least one bacteria, wherein the composition has a solids content of about 50% or above; and
c) recovering at least a portion of the contacted hydrocarbons.

### Claim 7 (depends on 6)

The method of claim 6, wherein the hydrocarbon source is a subterranean reservoir comprising an injection well and a production well installed therein, wherein the method comprises injecting the composition into the injection well of the subterranean reservoir and recovering at least a portion of the hydrocarbons from the production well.

### Claim 8 (depends on 6)

The method of claim 6, wherein the method is for enhanced oil recovery (EOR).

### Claim 9 (depends on 6)

The method of claim 6, wherein the lignin comprises at least one of lignin nanoparticles and lignin microparticles.

### Claim 10 (depends on 6)

The method of claim 6, wherein the lignin comprises lignin particles, wherein at least 20% of the lignin particles are lignin nanoparticles.

### Claim 11 (depends on 6)

The method of claim 6, wherein the composition further comprises a catholyte solution.

### Claim 12 (depends on 11)

The method of claim 11, wherein the catholyte solution is a stabilized or enhanced catholyte solution.