Metallgesellschaft Aktiengesellschaft

Mg Technologies Ag

Outokumpu Oyj

Stefan Laibach

Nikola Anastasijevic

Dietrich Werner

Karl-Heinz Daum

Wolfram Schalk

Jean-Paul Nepper

Helmut Schatton

Egon Winkler

Markus Schweitzer

Friedhelm M&uuml;nker

Achim Hollnagel

Reinhard Dobner

Heinrich Cieslak

Holger Langschied

Walter K&uuml;hn

Marcus Runkel

To protect a plate-type heat exchanger () against corrosion due to the attack of sulfuric acid, it is proposed in accordance with the invention that the region through which flows sulfuric acid has at least one metal cathode () and one reference electrode (), that at least half the metal plates () have an electric contact () which is connected with the anode () of an electric d.c. voltage source of variable electric voltage, that the metal cathode () likewise is electrically connected with the d.c. voltage source, and that the d.c. voltage source belongs to a potentiostat () which is electrically connected with the reference electrode ().

Plate-type heat exchanger with anodic corrosion protection

The electrolytic cell has a trough-like container with a bottom, with side walls and with at least one inlet and at least one outlet for the electrolyte. Numerous plate-like electrodes are disposed in the container and are partly immersed in an electrolyte bath. The bottom of the container which is in contact with the electrolyte bath has numerous openings for the passage of electrolyte, and below the bottom there is disposed at least one distribution chamber for recirculated electrolyte. At least one of the side walls of the container is equipped with at least one recirculation chamber for recirculating electrolyte from the electrolyte bath into the distribution chamber, the upper portion of the recirculation chamber being connected with the electrolyte bath and the lower portion of the recirculation chamber communicating with the distribution chamber.

Electrolytic cell for electrochemically depositing one of the following metals, copper, zinc, lead, nickel or cobalt

The electrolyte is supplied from a reservoir through at least one supply line to an electrolysis area including anodes and cathodes and at least one electric d.c. voltage source, and used electrolyte is at least partly recirculated from the electrolysis area back to the reservoir through at least one discharge line. Between a first contact point in the electrolyte of the supply line and a second contact point in the electrolyte of the discharge line there is a bridge line containing electrolyte, where the ohmic resistance R of the electrolyte in the bridge line between the first and the second contact point is not more than 10% of the ohmic resistance R which exists between the first and the second contact point in the electrolyte flowing through the reservoir. The amount of electrolyte flowing through the bridge line per unit time is not more than 5% of the amount of electrolyte flowing in the supply line in the vicinity of the first contact point.

Method for preventing stray currents in peripheral system parts during an electrolysis process for obtaining metals

This invention concerns a process in which gases or gas mixtures are reacted in the presence of an ion-conductive liquid in an electro-chemical cell. The cell has at least one anode (,) and at least one cathode (,) to which an external electrical constant potential is applied so that a direct current flows through the ion-conducting liquid. In the lower region of the cell a sump (,) of ion-conductive liquid is located into which the electrodes are partially immersed. At least 20% of the entire surface of at least one of the electrodes is located outside the sump in an upper region through which gas flows. This upper region of the cell is sprayed or irrigated with the ion-conductive liquid and the electrode surface at least partially wet. During this wetting process, the gas flows across the electrode surface.

Process for carrying out chemical reactions in an electrochemical cell

Electrolytic cell with removable bipolar electrodes

Growing community of inventors

Geismar/Rhön, Germany

Stefan Laibach