Patent ID: 8038852

Claim:
A fluorine gas generator for generating highly pure fluorine gas by electrolyzing an electrolyte comprising hydrogen fluoride in the form of a molten mixed salt, the generator comprising: an electrolytic cell divided, by a partition wall, into an anode chamber in which an anode is disposed and a cathode chamber in which a cathode is disposed; pressure maintenance means for maintaining said anode chamber and said cathode chamber at atmospheric pressure; and liquid level sensing means for sensing the levels of the electrolyte in the anode chamber and in the cathode chamber, respectively, at least five level stages, wherein the liquid level sensing means senses a dangerous liquid level, which is close to an abnormal level, between a highest warning liquid level and an intermediate liquid level and between a lowest warning liquid level and the intermediate liquid level; the pressure maintenance means includes pressure automatic valves which open/close in association with pressure gauges in the anode chamber and the cathode chamber, the pressure automatic valves discharging or stopping discharge of gases generated in the anode chamber and the cathode chamber, respectively; a first gas line connected to the cathode chamber for discharging gases inside the cathode chamber, the first gas line having a first automatic valve which opens/closes in association with the liquid level sensing means; a second gas line connected to the anode chamber for discharging gases inside the anode chamber, the second gas line having a second automatic valve which opens/closes in association with the liquid level sensing means; a third gas line connected to the cathode chamber for supplying a purge gas, the third gas line having a third automatic valve which opens/closes in association with the liquid level sensing means; and a fourth gas line connected to the anode chamber for supplying a purge gas, the fourth gas line having a fourth automatic valve which opens/closes in association with the liquid level sensing means; when the liquid level sensing means senses the dangerous level, which is close to the abnormal level, between the intermediate liquid level and the highest warning liquid level, the first automatic valve is automatically closed to stop discharging the gas from the cathode chamber, and the fourth automatic valve is automatically closed to stop supplying the purge gas to the anode chamber; and when the liquid level sensing means senses the highest warning liquid level, the second automatic valve is automatically closed to stop discharging the gas from the anode chamber, and the third automatic valve is automatically closed to stop supplying the purge gas to the cathode chamber.