Electrochemical Synthesis of Lysine Monohydrochloride

Example 3

As batch reactor, a 10 ml glass vessel (diameter 2.5 cm) is used. A Pt coil (coil=0.5 cm high, 1 cm diameter, circumference=3.1 cm, surface area=1.6 cm²) serves as anode. As cathode a Ni foam is bent into cylindrical shape (Size=5.5 cm×5.5 cm—long enough to reach out of the reactor). It is bend in a cylindrical shape and wrapped around a cylindrical foam (diameter=2 cm). The cathode surface area=5.5 cm×0.5 cm (Pt coil height)=2.75 cm². The Pt wire above the coil is insulated by a PTFE tube in order to prevent echem reactions at the wire and pierced through the spacer to keep the Pt electrode in place. The Ni cathode leaves a gap open to be able to see the Pt coil. The distance between both electrodes is 3 mm

• • No reference electrode and no stirring are used.
  • The reactor is filled with 5 ml lysine monohydrochloride (1 M) and NaBr (0.14 M). The measured pH is around 6.
  • Reaction parameters: The total experiment time: 72 h, current=41 mA (current density=15 mA/cm²).
  • During reaction, samples are taken and analyzed by NMR. The results are summarized in Table 1.