An electromechanical nixtamalization system comprising a rotary reactor that rotates on a horizontal shaft, comprising an inner steel container made as a single piece, without internal blades, resistors, a layer of ceramic fibre, and a removable stainless steel jacket, an upper receiving hopper that places the maize grains into the reactor; a cooling vat with a lid, the cooling vat having an inner wall, an intermediate wall and a cooling chamber between the inner wall and the intermediate wall, and a high-pressure polyurethane foam casing.