Ordered packing

A ordered packing for intimately contacting a vapor phase with a liquid phase, said ordered packing comprising:

• a plurality of elongated elements, each of the elongated elements having at least one elongated surface configured to be wet by the liquid phase and thereby form a film of the liquid phase on the at least one elongated surface;
• the plurality of elongated elements packed to form a structure such that in each of a plurality of parallel planes, extending in two orthogonal directions, the elongated elements cross one another to form lattices having openings defined between the crossings of the elements;
• the plurality of elongated elements interleaved within said structure such that elongated elements pass through the openings of the lattices and form repeating clusters of four of the elongated elements in a pyramid-like arrangement, thereby to provide by each of said clusters and the at least one elongated surface of each of the elongated elements thereof, at least four pathways for the liquid phase to descend through the structure;
• and
• the structure having an open area for the vapor phase to ascend through the structure and contact the descending liquid phase.