Exploration of Gibbs Free Energy in the Production of Hydrofluoric Acid from Fluorosilicic Acid
This article discusses the calculation of Gibbs free energy involved in the production of hydrofluoric acid from fluorosilicic acid and its impact on the reaction.The symbol operation of the open-source program Octave was used to solve the equilibrium system of ammonium bifluo-ride reacting with sodium fluoride and potassium fluoride,respectively.The calculation results indicate that the ammonolysis process of fluorosil-icate is spontaneous,the decomposition reaction of ammonium fluoride is non spontaneous,the reaction of ammonium bifluoride with sodium or potassium fluoride is an equilibrium reaction,and the decomposition reaction of sodium or potassium bifluoride is non spontaneous.For an equi-librium reaction system,when the molar feed ratio of ammonium bifluoride to fluoride salt is between 1∶0.9-1.1,the content of reaction prod-ucts is the highest.At this time,the conversion rate of the reaction is about 50％,and the main content of the product is about 60％.
Fluorosilicic AcidHydrogen FluorideOctaveGibbs Free Energy
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