Method and device for measuring water content in hydrogen fluoride-containing fluoride salt compounds

A water content measurement device for a hydrogen fluoride-containing compound represented by the general formula:

• XF.nHF (where X is either one of K, NH4, Na and Li;
• and n is a rational number greater than 0), the water content measurement device comprising:
• a thermal decomposition unit having a reaction vessel equipped with heating means for causing thermal decomposition of the hydrogen fluoride-containing compound;
• an introduction line arranged to introduce the hydrogen fluoride-containing compound into the thermal decomposition unit;
• a collection unit having a cooling trap for collecting hydrogen fluoride in a thermal decomposition gas generated by the thermal decomposition within the reaction vessel;
• an introduction line connected between the reaction vessel and the cooling trap to introduce the thermal decomposition gas from the reaction vessel into the cooling trap;
• a water content measurement unit having water content measurement means for measuring the water content of the collected hydrogen fluoride so as to determine the water content of the hydrogen fluoride-containing compound based on a measurement result of the water content measurement means;
• an introduction line connected between the cooling trap and the water content measurement means to introduce the collected hydrogen fluoride from the cooling trap into the water content measurement means;
• and
• pressure measurement means mounted to the introduction line between the reaction vessel and the cooling trap for measuring an increase in pressure caused by generation of the thermal decomposition gas.