Direct air capture device

A vacuum chamber for a direct air capture process and enclosing an interior space for housing an adsorber structure comprising

• a contiguous circumferential wall structure arranged around an axis, which circumferential wall structure in an axial direction is closed by an inlet and an outlet axial wall, respectively, both axial walls comprising at least one circular closing lid allowing for,
• in an open position, gas to be circulated through the vacuum chamber for contacting the adsorber structure, and
• in a closed position, to close the interior space and to allow evacuation of the interior space down to a pressure of 500 mbarabs, and less,
• wherein at least one of said axial walls is provided with a circular opening with a contact ring portion, which circular opening can be closed in a gas tight manner by said circular closing lid in the form of a single circular steel lid plate, having a thickness in the range of 4-12 mm and having a diameter in the range of 0.5-1.5 m and larger than said circular opening and in a closed state contacting said contact ring in an axial direction,
• wherein said contact ring on its axial surface facing said lid plate in closed position, is provided with a full perimeter circular elastic sealing element.