the invention describes an integrated process for capturing co 2 emitted by at least a portion of the flue gas coming from the regeneration zone of a catalytic cracking unit using a unit for amine treatment of said flue gas , in which the catalytic cracking unit is equipped with an external exchanger using as the hot fluid a portion of the catalyst removed from the regeneration zone , the heat necessary for the amine treatment unit being supplied integrally by the catalytic cracking unit using the steam generated by said external exchanger .