Abstract: A reactor assembly (1) for improving reaction between two immiscible phases for metal reduction of hydrocarbons is disclosed, which is a modification of a CSTR type reactor assembly. A third gaseous phase is also present in the reactor. Metal plates (5) are provided, mounted on supporting rods (6) which are electrically insulated from the rest of the reactor. The metal plates are made of the same metal to avoid detachment of metal atoms from metal plates. The metal plates serve as the means of transferring only the electrons from the metal plates to the liquids in which they are fully immersed, so that the reaction is made more efficient.