A catalyst regenerator for regenerating spent catalyst, comprising: a catalyst regenerator vessel (102, 202, 302, 402) housing a dense phase catalyst bed; and a spent catalyst distributor (104, 204, 304, 404, 508) comprises a conduit (110, 206, 306, 406) projecting horizontally or horizontally and downwardly into the catalyst regenerator vessel (102, 202, 302, 402), the conduit (110, 206, 306, 406) comprising: a proximal end (112a, 208a, 308a, 408a); a distal end (112b, 208b, 308b, 408b); an opening (114, 210, 310, 410) located at the distal end (112b, 208b, 308b, 408b) for introducing the spent catalyst at a first location inside the catalyst regenerator vessel (102, 202, 302, 402); and a plurality of orifices (116, 212, 312, 412) located along a length of the conduit (110, 206, 306, 406) between the distal end (112b, 208b, 308b, 408b) and an inner wall (106a, 214, 314, 414) of the catalyst regenerator vessel (102, 202, 302, 402) for introducing the spent catalyst at a plurality of locations inside the catalyst regenerator vessel (102, 202, 302, 402), wherein each of the plurality of orifices (116, 212, 312, 412) located along the length of the conduit (110, 206, 306, 406) has a diameter in the range of 40 to 60% of a diameter of the conduit (110, 206, 306, 406), wherein the catalyst regenerator further comprises at least one baffle provided within the conduit (110, 206, 306, 406) for directing a flow of the spent catalyst within the conduit (110, 206, 306, 406) towards at least one of the plurality of orifices (116, 212, 312, 412) located along the length of the conduit (110, 206, 306, 406). a catalyst regenerator vessel (102, 202, 302, 402) housing a dense phase catalyst bed; and a spent catalyst distributor (104, 204, 304, 404, 508) comprises a conduit (110, 206, 306, 406) projecting horizontally or horizontally and downwardly into the catalyst regenerator vessel (102, 202, 302, 402), the conduit (110, 206, 306, 406) comprising: a proximal end (112a, 208a, 308a, 408a); a distal end (112b, 208b, 308b, 408b); an opening (114, 210, 310, 410) located at the distal end (112b, 208b, 308b, 408b) for introducing the spent catalyst at a first location inside the catalyst regenerator vessel (102, 202, 302, 402); and a plurality of orifices (116, 212, 312, 412) located along a length of the conduit (110, 206, 306, 406) between the distal end (112b, 208b, 308b, 408b) and an inner wall (106a, 214, 314, 414) of the catalyst regenerator vessel (102, 202, 302, 402) for introducing the spent catalyst at a plurality of locations inside the catalyst regenerator vessel (102, 202, 302, 402), a proximal end (112a, 208a, 308a, 408a); a distal end (112b, 208b, 308b, 408b); an opening (114, 210, 310, 410) located at the distal end (112b, 208b, 308b, 408b) for introducing the spent catalyst at a first location inside the catalyst regenerator vessel (102, 202, 302, 402); and a plurality of orifices (116, 212, 312, 412) located along a length of the conduit (110, 206, 306, 406) between the distal end (112b, 208b, 308b, 408b) and an inner wall (106a, 214, 314, 414) of the catalyst regenerator vessel (102, 202, 302, 402) for introducing the spent catalyst at a plurality of locations inside the catalyst regenerator vessel (102, 202, 302, 402), wherein each of the plurality of orifices (116, 212, 312, 412) located along the length of the conduit (110, 206, 306, 406) has a diameter in the range of 40 to 60% of a diameter of the conduit (110, 206, 306, 406), wherein the catalyst regenerator further comprises at least one baffle provided within the conduit (110, 206, 306, 406) for directing a flow of the spent catalyst within the conduit (110, 206, 306, 406) towards at least one of the plurality of orifices (116, 212, 312, 412) located along the length of the conduit (110, 206, 306, 406).