Direct air capture device

A separation unit for separating at least one gaseous component from a gas mixture containing that component,

• wherein the separation unit comprises
• at least one contiguous and sealing circumferential wall element, circumferentially enclosing at least one cavity,
• said at least one contiguous and sealing circumferential wall element defining an upstream opening and an opposed downstream opening of said at least one cavity,
• said cavity containing at least one gas adsorption structure for adsorbing said at least one gaseous component,
• and wherein the separation unit further comprises a pair of opposing sliding doors for sealing the upstream opening and the downstream opening, respectively, of said at least one cavity in a closed state,
• wherein each of the pair of opposing sliding doors, to open the closed cavity, is shifted in a direction essentially parallel to a plane of the respective sliding door to uncover the upstream and downstream opening, respectively and to allow for flow through of gas mixture through the gas adsorption structure,
• wherein each of the pair of opposing sliding doors comprises a pair of curved wall elements, an outer wall providing for a convex outer shape of the sliding door facing the outside, and an inner wall providing for a concave inner shape of the sliding door facing said cavity,
• wherein the axes of curvature of said curved wall elements of one or both sliding doors are aligned parallel and in the same plane, or are coaxial,
• and wherein connecting portions joining said wall elements at the edges are contacting and sealing against said circumferential wall element.