Level and pressure control in condenser of the 13C isotope separation column

The process of the ¹³C in cryogenic separation column is an intricate one. A lot of parameters must be kept constant at empirical values. From among these, the nitrogen level and the temperature in condenser are essential for the separation process. In present, the liquid nitrogen level is controlled manually and any error of the operators can waste the final product. The paper proposes not only a system for liquid nitrogen level control, but also a second system able to decrease - due to the under-pressure - the evaporation temperature of liquid nitrogen in order to improve the separation process. The paper analyzes the two systems as independent entities and the interinfluences are treated as disturbances. The analysis in the true MIMO frame is a future task.