Gas-solid contacting system with structured packing

A structured packing element (106) connected to a tube (104) for stripping of spent catalyst in a FCC (Fluid Catalytic Cracking) reactor, wherein the structured packing element (106) comprises:

• one or more plates (202, 302, 402, 502) arranged internal or external to a tube (104) to create a 3-dimensional flow path for smooth flow and radial distribution of the spent catalyst, wherein each plate (202, 302, 402, 502) comprises one or more holes;
• wherein when the one or more plates (202, 302, 402, 502) are arranged external to the tube (104):
• a plate (202) is twisted in clockwise or anticlockwise direction continuously around the tube (104);
• or
• a plurality of plates (302) are arranged on the surface of the tube (104) in clockwise or anticlockwise direction discontinuously at multiple positions in a spiral and step wise manner, wherein the plurality of plates (302) are arranged at an angle to the tube (104);
• or
• a plurality of plates (502) are arranged longitudinally around a periphery of the tube (104);
• and
• wherein when the one or more plates (202, 302, 402, 502) are arranged internal to the vertically aligned tube (104):
• the one or more plates (402) are twisted in clockwise or
• anticlockwise direction and attached to an inner wall of vertically aligned tube (104).