| 摘要 |
This invention relates to a method of determining the concentration of each component of a ternary mixture essentially consisting of sulfuric acid, hydrogen fluoride, and water, which comprises measuring at least one set of three physical quantities, viz. (1) temperature, (2) ultrasound propagation velocity, and (3) electrical conductivity or viscosity, of said ternary mixture and converting measured values to the concentration of the particular component with reference to separately pre-constructed calibration curves representing the relationships of the concentrations of respective components of a ternary mixture of sulfuric acid, hydrogen fluoride, and water to said three physical quantities. This invention relates to the process for continuous production of hydrogen fluoride using the method of the invention for determining the component concentration, particularly the concentration of water, of a ternary mixture, too. <IMAGE>
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