A method for the use of a gaseous effluent containing a CO.sub.2 gas fraction and a non-CO.sub.2 gas fraction, including at a first location: providing liquid nitrogen at a temperature less than −196° C., and causing the gaseous effluent to contact the liquid nitrogen to as to capture at least part of the CO.sub.2 present in the CO.sub.2 gas fraction as a mixture of CO.sub.2 particles and liquid nitrogen. Conveying at least part of the mixture to a second location, and at the second location, bringing the mixture into contact with one or more ingredients of a wet concrete before and/or during and/or after the wet concrete is prepared by blending the ingredients of the wet concrete in a blender, so that the mixture extracts heat from said one or more ingredients of the wet concrete, and CO.sub.2 from the mixture partially carbonates Ca-compounds present in the wet concrete.

The present invention describes a method for the production of liquid biogas (LBG), said method comprising the following steps:—inflow of crude gas comprising mainly methane and carbon dioxide;—removal of trace elements like hydrogen sulphide, siloxanes and VOC's from the crude gas;—dehumidification;—particle purification; for the production of a treated biogas; separation of carbon dioxide from the treated biogas;—condensation of the treated biogas with a low content of carbon dioxide, for the production of LB G with a carbon dioxide content of maximum 100 ppm, preferably at or close to atmospheric pressure the LB G is lose to 100% pure methane with a carbon dioxide content of maximum 100 ppm, wherein the separation of carbon dioxide from the treated biogas involves freezing carbon dioxide in the treated biogas.

Disclosed are methods of dewatering solid byproduct. In some embodiments, the solid byproduct contains particles and is produced from a fermentation process for making an oxygenated compound such as ethanol. The method comprises a chemical sequence for conditioning (pre-treating) the solid byproduct to be dewatered. The solid byproduct (in water) is treated with alkaline material to increase its pH to about 7-8.5. Coagulant is added to the alkaline-treated solid byproduct to reduce charge on the solid byproduct. An agglomerating polymer is then added to increase the average size of the solid byproduct particles to a desired size (e.g., at least about 1 mm). Dewatering can further use known technologies such as screw press, belt press, filter press, centrifuge, and/or a dryer to separate the conditioned or pre-treated byproduct from water. Also disclosed are methods of producing oxygenated product, as well as methods of producing animal feed and/or fertilizer, respectively.

A method of sequestering gas-phase materials, hempcrete formed using the method, and methods of using hempcrete are disclosed. An exemplary method includes providing a mixture of hempcrete compound material within a chamber and exposing the mixture within the chamber to a gas for a period of time to form hempcrete, wherein the hempcrete exhibits net-negative life cycle carbon emissions. A model to predict net life cycle carbon emission of hempcrete is also disclosed.

A desulfurizer material for desulfurizing fuel supplied to a fuel cell system, the desulfurizer material comprising one or more manganese oxide materials having an octahedral molecular sieve (OMS) structure, and the desulfurizer material being resistant to moisture and being capable of removing organic sulfur containing compounds and H.sub.2S. The desulfurizer material is used in a desulfurizer assembly which is used as part of a fuel cell system.

Provided herein are gas permeable membranes comprising an amine-containing selective layer on top of a gas permeable polymer support as well as methods of making and using thereof. The membranes are useful for the separation of CO.sub.2 from N.sub.2-containing gases.

This disclosure relates to the adsorption and separation of carbon dioxide in a feed stream (e.g., natural gas) using zeolite ITQ-55 as the adsorbent. A process is disclosed for removing impurities such as carbon dioxide and nitrogen while producing a hydrocarbon product. The process involves passing a feed stream through a bed of an adsorbent comprising zeolite ITQ-55 to adsorb carbon dioxide from the feed stream, thereby producing a product stream depleted in carbon dioxide. The zeolite ITQ-55 has a mean crystal particle size within the range of from about 0.1 microns to about 100 microns. The feed stream is exposed to the zeolite ITQ-55 at effective conditions for performing a kinetic separation, in which the kinetic separation exhibits greater kinetic selectivity for carbon dioxide than for methane or nitrogen. The system and method of this disclosure are particularly suitable for use with feed streams in excess of 10 MMSCFD utilizing rapid cycle PSA operations by tuning crystals size.

A process and/or system for producing fuel that includes providing biogas, removing carbon dioxide from the biogas, transporting the upgraded biogas to a hydrogen plant; providing the transported upgraded biogas and fossil-based natural gas as feedstock for hydrogen production. The carbon intensity of the fuel is less than 11 gCO.sub.2-eq/MJ, at least in part because carbon dioxide removed from the biogas and carbon dioxide from hydrogen production is captured and stored.

A system including biogas purification and provides biogas as feedstock to a solid oxide fuel cell. The biogas purification treatment process provides a polished biogas that is substantially free of carbonyl sulfides and hydrogen sulfide. The system uses a biogas treatment apparatus, that includes apparatus such as a packed columns, comprising copper oxide or potassium permanganate packing material, and an activated carbon component configured to treat the biogas by polishing it to remove carbonyl sulfides and deleterious trace residues, such as hydrogen sulfide, that were not removed by any prior bulk H2S removal steps. In addition, an oil removal device is used to remove any entrained fine oil droplets in the biogas. A polished biogas having in the range of 60% methane is charged to the fuel cell. Electricity generated may be fed into a grid or used directly as energy to charge electrical-powered vehicles, for example. Energy credits are tracked in real time and are appropriately assigned.

An adsorption material is disclosed that comprises a metal-organic framework and a plurality of ligands. The metal-organic framework comprising a plurality of metal ions. Each respective ligand in the plurality of ligands is amine appended to a respective metal ion in the plurality of metal ions of the metal-organic framework. Each respective ligand in the plurality of ligands comprises a substituted 1,3-propanediamine. The adsorbent has a CO.sub.2 adsorption capacity of greater than 2.50 mmol/g at 150 mbar CO.sub.2 at 40° C. Moreover, the adsorbent is configured to regenerate at less than 120° C. An example ligand is diamine 2,2-dimethyl-1,3-propanediamine. An example of the metal-organic framework is Mg.sub.2(dobpdc), where dobpdc.sup.4− is 4,4′-dioxidobiphenyl-3,3′-dicarboxylate. Example applications for the adsorption material are removal of carbon dioxide from flue gas and biogasses.