Sigma has multiple patents for oxidation of etchant with Oxygen gas, completely replacing the conventional and most frequently used Hydrogen Peroxide.
To transfer Copper from etchant to our plating process, we utilize several solvent extraction steps. Solvent extraction is a method used to mix two immiscible liquids and transfer different compounds based on relative sollubility, in our case Copper. The different densities of the two liquids is then used to separate them from each other again, either using a settler tank or with a centrifuge.
To feed the Reactor, as Oxygen gas source we either utilize an Oxygen generator or Oxygen gas cylinders depending on the size of the system.