The present invention relates to an extracorporeal circuit for CO2 removal from blood comprising a line for taking blood from the patient, a decarboxylation assembly and a line for returning the blood to the patient; said decarboxylation assembly comprising a first filtering unit, an oxygenator, an electrodialyzer adapted to generate an acid solution and a basic solution and means for the infusion of said acid solution upstream of said oxygenator, wherein said electrodialyzer comprises a first electrodialysis chamber and a second electrodialysis chamber, said first and second electrodialysis chambers being separated by an ionic membrane, and wherein said first chamber and said second chamber are respectively separated from the positive electrode, or anode, and from the negative electrode, or cathode, by means of a bipolar membrane.