Abstract:
The present disclosure provides a method for reducing the carbon intensity of hydrogen by replacing, at a hydrogen production facility, a fraction of a non-renewable gaseous feedstock with a biomethane feedstock, wherein the non-renewable gaseous feedstock replaced is (a) a feedstock fed to methane reforming and/or (b) a feedstock used to generate heat for the reforming in the hydrogen production, and wherein the fraction of the non-renewable gaseous feedstock replaced by the biomethane feedstock is less than 50% and is at least r defined by Equation A herein. The disclosed process for reducing the carbon intensity of hydrogen is designed to reduce greenhouse gas (GHG) emissions and mitigate climate change. The biomethane feedstock in some examples has a carbon intensity (CI) value within a range that is between 15 g CO2-eq/MJ and −500 g CO2 eq/MJ.
Abstract:
The present disclosure provides a method for reducing the carbon intensity of hydrogen by replacing, at a hydrogen production facility, a fraction of a non-renewable gaseous feedstock with a biomethane feedstock, wherein the non-renewable gaseous feedstock replaced is (a) a feedstock fed to methane reforming and/or (b) a feedstock used to generate heat for the reforming in the hydrogen production, and wherein the fraction of the non-renewable gaseous feedstock replaced by the biomethane feedstock is less than 50% and is at least r defined by Equation A herein. The disclosed process for reducing the carbon intensity of hydrogen is designed to reduce greenhouse gas (GHG) emissions and mitigate climate change. The biomethane feedstock in some examples has a carbon intensity (CI) value within a range that is between 15 g CO2 eq/MJ and −500 g CO2 eq/MJ.
Abstract:
A method for providing a fuel includes removing hydrogen sulfide and/or carbon dioxide from biogas to provide partially purified biogas, which is filled in a mobile storage system. The partially purified biogas is transported to a centralized processing facility, in the mobile storage system, by truck, rail, or ship. At the centralized processing the partially purified biogas is further processed, either to produce a fuel that is renewable or has renewable content, or to produce renewable natural gas, which is used to produce the fuel that is renewable or has renewable content.
Abstract:
A method for providing a fuel includes providing biogas from a plurality of biogas sources, the biogas from each biogas source produced in a process comprising filling a vessel with raw biogas or partially purified biogas to a pressure of at least 1500 psig and transporting the filled vessel to a centralized processing facility by vehicle. A fuel is produced in a fuel production process that includes feeding the biogas transported to the centralized processing facility to a biogas upgrading system that is configured to provide a carbon dioxide removed from the biogas. The removed carbon dioxide is provided for transport by vehicle and/or pipeline and/or sequestered to offset greenhouse gas emissions attributed to compressing the biogas for transport.
Abstract:
A process for hydrolyzing lignocellulosic biomass includes feeding lignocellulosic biomass into a pretreatment reactor, wherein the pretreatment reactor has a headspace charged with sulfur dioxide previously used in the pretreatment of lignocellulosic biomass. In addition, acid comprising sulfur dioxide and/or sulfurous acid is fed into the pretreatment reactor (e.g., with the lignocellulosic biomass, separate from the lignocellulosic biomass, or a combination thereof) and the lignocellulosic biomass is heated. As the pretreated lignocellulosic biomass is discharged from the pretreatment reactor, at least a portion of the sulfur dioxide used in the pretreatment is retained in the headspace.
Abstract:
Provided herein is a process for producing one or more products from a lignocellulosic feedstock. The process comprises treating the lignocellulosic feedstock by contacting the feedstock at least sulfur dioxide, sulfurous acid, or a combination thereof to produce a pretreated feedstock comprising one or more sulfonic acids. A process stream comprising one or more sulfonic acids is subsequently treated in a wet oxidation step to produce a stream comprising at least soluble oxidized phenolic compounds. The soluble oxidized phenolic compounds are then fed to an anaerobic digestion to produce methane. Optionally, hydrogen sulfide is produced during the anaerobic digestion. The hydrogen sulfide may then be converted to an acid selected from sulfur dioxide, sulfurous acid or a combination thereof in one or more steps. The acid may then be re-used in treatment as desired.
Abstract:
A process for forming a fuel or a fuel intermediate using three fermentations includes treating a feedstock to obtain a fermentable carbohydrate, conducting a first fermentation to ferment the fermentable carbohydrate to fermentation product, obtaining biogas produced from a second fermentation that includes anaerobic digestion, and conducting a third fermentation to ferment a gas to produce fermentation product, where the gas contains one or more components obtained or derived from the biogas. An aqueous stream containing fermentation product produced in the third fermentation is used within the process.
Abstract:
A process for producing one or more products from a lignocellulosic feedstock comprising treating the lignocellulosic feedstock to produce sugar in one or more stages comprising addition of acid, base or a combination thereof and introduction of heat. The addition of the acid, base, or a combination thereof produces a salt. The sugar is fermented to produce a fermentation product and the fermentation product is recovered. A stream comprising the salt is treated by wet oxidation with the introduction of heat. A stream comprising salt resulting from the wet oxidation is provided for use as a salt product or a process chemical for introduction within the process. Heat from the wet oxidation may be supplied to any stage of the process in which heat is introduced.
Abstract:
A process is provided for forming a fuel or a fuel intermediate from two fermentations that includes feeding an aqueous solution comprising a fermentation product from a first bioreactor to a second bioreactor and/or a stage upstream of the second bioreactor, which also produces the fermentation product. The aqueous solution may be added at any stage of the second fermentation and/or processing steps upstream from the second bioreactor that would otherwise require the addition of water. Accordingly, the product yield is increased while fresh/treated water usage is decreased.
Abstract:
The present disclosure provides a process for forming a biogenic carbon-based fuel or a fuel intermediate from biogenic carbon dioxide and hydrogen. The hydrogen is sourced from a process that produces hydrogen and fossil carbon dioxide from a fossil-fuel hydrocarbon and separates the fossil carbon dioxide from the hydrogen. The process may further comprise carrying out or arranging for one or more parties to carry out at least one step that contributes to a reduction in the GHG emissions of the biogenic carbon-based fuel, or a fuel made from the fuel intermediate, of at least 20% relative to a gasoline baseline. In various embodiments this includes (a) introducing the fossil carbon dioxide underground, and/or (b) using a biogenic carbon-based product selected from a chemical and energy product produced from the non-fossil organic material to displace the use or production of a corresponding fossil-based product. Methods of using the present invention to enable fuel credit generation are also described.