Reactor for dissolving a solid feedstock based on thermosetting materials such as used-tyre granules

A reactor for dissolution of a solid feedstock based on thermosetting materials existing in the form of aggregates with sizes of between a first minimum value and a second maximum value, such as used tire aggregates, in the presence of a reaction stream having an upward flow comprising a liquid solvent, said solvent being capable of dissolving said solid feedstock, said reactor comprising:

• a chamber (1) of elongate shape along the vertical axis, said chamber (1) comprising an upper part (210) of cross-section S1 and a lower part (220) of cross-section S2, the upper part (210) being located above the lower part (220) along the vertical axis;
• a means for introduction (2) of the solid feedstock located in the upper part (210) of the chamber (1);
• a means for introduction (4) of the liquid solvent;
• a means for discharge (7) of at least a fraction of the reaction stream outside said dissolution reactor;
• a means for bleeding off (3) a gas fraction located at the top of the chamber (1) of the reactor;
• said reactor being characterized in that:
• the cross-section S1 of the upper part (210) of the chamber (1) is greater than the cross-section S2 of the lower part (220) of the chamber (1);
• and in that
• said reactor additionally comprises a loop for recirculation of the reaction stream comprising a means for withdrawal (6) of at least a fraction of the reaction stream located at the level of the upper part (210) of the chamber (1) and a means for introduction (5) of at least a fraction of the withdrawn reaction stream located at the level of the lower part (220) of the chamber (1).