A method of encapsulating an engineered pellet in a porous membrane is disclosed. The method includes the steps of: (i) dissolving a membrane solute in a membrane solvent to produce a membrane solution; (ii) applying the membrane solution to a pellet to form a pellet encapsulated with the membrane solution; (iii) subjecting the membrane solution that encapsulates the pellet to a phase inversion and; (iv) drying the pellet to form a porous membrane encapsulated pellet. A porous membrane encapsulated pellet is also described.

A method for removing carbon dioxide directly from ambient air, using a sorbent under ambient conditions, to obtain relatively pure CO.sub.2. The CO.sub.2 is removed from the sorbent using process heat, preferably in the form of steam, at a temperature in the range of not greater than about 130° C., to capture the relatively pure CO.sub.2 and to regenerate the sorbent for repeated use. Increased efficiency can be achieved by admixing with the ambient air, prior to contacting the sorbent, a minor amount of a preferably pretreated effluent gas containing a higher concentration of carbon dioxide. The captured carbon dioxide can be stored for further use, or sequestered permanently. The above method provides purified carbon dioxide for further use in agriculture and chemical processes, or for permanent sequestration.

A method for removing carbon dioxide directly from ambient air, using a sorbent under ambient conditions, to obtain relatively pure CO.sub.2. The CO.sub.2 is removed from the sorbent using process heat, preferably in the form of steam, at a temperature in the range of not greater than about 130° C., to capture the relatively pure CO.sub.2 and to regenerate the sorbent for repeated use. Increased efficiency can be achieved by admixing with the ambient air, prior to contacting the sorbent, a minor amount of a preferably pretreated effluent gas containing a higher concentration of carbon dioxide. The captured carbon dioxide can be stored for further use, or sequestered permanently. The above method provides purified carbon dioxide for further use in agriculture and chemical processes, or for permanent sequestration.

Disclosed herein is a gas capture system comprising: a gas inlet arranged to receive a gas flow into the system; a gas outlet arranged to provide a gas flow out of the system; a gas capture region for mass transfer between a gas and a sorbent of the gas; and a sorbent regeneration region for regenerating the sorbent by heating the sorbent so that the sorbent releases a gas; wherein: the gas capture region is arranged to receive sorbent from the sorbent regeneration region; the sorbent regeneration region is arranged to receive sorbent for regeneration from the gas capture region; the sorbent is a solid sorbent of carbon dioxide gas; and the gas capture region comprises: a sorbent inlet arranged to receive an input of sorbent into the gas capture region; a sorbent outlet arranged to provide an output of sorbent from the gas capture region; one or more mass transfer regions arranged between the sorbent inlet and the sorbent outlet such that, in use, the sorbent is retained within the one or more mass transfer regions as the sorbent moves through the mass transfer regions and the mass transfer between the gas and the sorbent occurs in the one or more mass transfer regions; a first gas chamber; and a second gas chamber, that is different from the first gas chamber; wherein the first gas chamber, second gas chamber and one or more mass transfer regions are arranged such that, in use, there is a flow path for gas that comprises gas flowing from the first gas chamber into one of the one or more mass transfer regions, the gas then flowing from said one of the mass transfer regions into the second gas chamber and the gas then flowing from the second gas chamber back into said one of the mass transfer regions.

Disclosed herein is a gas capture system comprising: a gas inlet arranged to receive a gas flow into the system; a gas outlet arranged to provide a gas flow out of the system; a gas capture region for mass transfer between a gas and a sorbent of the gas; and a sorbent regeneration region for regenerating the sorbent by heating the sorbent so that the sorbent releases a gas; wherein: the gas capture region is arranged to receive sorbent from the sorbent regeneration region; the sorbent regeneration region is arranged to receive sorbent for regeneration from the gas capture region; the sorbent is a solid sorbent of carbon dioxide gas; and the gas capture region comprises: a sorbent inlet arranged to receive an input of sorbent into the gas capture region; a sorbent outlet arranged to provide an output of sorbent from the gas capture region; one or more mass transfer regions arranged between the sorbent inlet and the sorbent outlet such that, in use, the sorbent is retained within the one or more mass transfer regions as the sorbent moves through the mass transfer regions and the mass transfer between the gas and the sorbent occurs in the one or more mass transfer regions; a first gas chamber; and a second gas chamber, that is different from the first gas chamber; wherein the first gas chamber, second gas chamber and one or more mass transfer regions are arranged such that, in use, there is a flow path for gas that comprises gas flowing from the first gas chamber into one of the one or more mass transfer regions, the gas then flowing from said one of the mass transfer regions into the second gas chamber and the gas then flowing from the second gas chamber back into said one of the mass transfer regions.

The present invention relates to a method for continuously obtaining carbon dioxide from a carbon-dioxide containing atmosphere, in which a fibrous carrier material charged with polyethylene imine is guided alternately through at least one adsorption zone and at least one desorption zone. In addition, the present invention relates to a device by which the method according to the invention can be carried out.

Methods and systems for obtaining exhaust streams from wood drying processes and controlling emissions in exhaust streams from wood drying processes are provided. Methods and systems can include pre-treatment steps, such as removing particulate matter and/or heating a process exhaust stream from a wood dryer, in order to obtain an exhaust stream that is suitable for downstream recovery of terpenes from said exhaust stream. Exhaust streams can be contacted with a sorbent to remove volatile organic compounds, and other emissions, generating a purified air stream that is able to be released into the environment without further purification or oxidation.

Methods and systems for recovering terpenes and controlling the composition of terpenes collected from wood drying processes are provided. In particular, a sorbent having adsorbed materials, including terpenes, from a wood drying process can be desorbed in a desorber, resulting in a gaseous stream containing terpenes, which can be condensed and collected from the gaseous stream. The conditions of desorption can be controlled to ensure a desirable amount of alpha-pinene and beta-pinene relative to other terpenes, such as dipentene and camphene, in the collected terpenes.

A system and method for passive collection of atmospheric carbon dioxide is disclosed. The system includes a harvest chamber having a first opening and a sorbent regeneration system. The system also includes a capture body coupled to and movable by a support structure. The capture body includes a sorbent material and is movable by the support structure to be in a collection configuration wherein at least a portion of the capture body is in contact with a natural airflow outside the harvest chamber such that atmospheric carbon dioxide is captured by the sorbent material, and a release configuration wherein at least a portion of the capture body holding captured carbon dioxide is operated upon by the regeneration system inside the harvest chamber such that captured carbon dioxide is released to form an enriched gas.

A system and method for passive collection of atmospheric carbon dioxide is disclosed. The system includes a harvest chamber having a first opening and a sorbent regeneration system. The system also includes a capture body coupled to and movable by a support structure. The capture body includes a sorbent material and is movable by the support structure to be in a collection configuration wherein at least a portion of the capture body is in contact with a natural airflow outside the harvest chamber such that atmospheric carbon dioxide is captured by the sorbent material, and a release configuration wherein at least a portion of the capture body holding captured carbon dioxide is operated upon by the regeneration system inside the harvest chamber such that captured carbon dioxide is released to form an enriched gas.