Abstract: Based on the production practice and previous researchs, this article investigates the poisoning process of fluorine compounds (HF and SiF4) on vanadium catalyst (carrier contains SiO2) in the manufacture of sulfuric acid. It offers that the poisoning process of vanadium catalyst by fluoride is chiefly due to the reversible transformation in the form of fluorine, i. e. 4HF + SiO2 SiF4 + 2H2O Using thermodynamic method to investigate the poisoning process of vanadium catalyst in sulfur dioxide converter, and to make a chemical equilibrium calculation about its reaction, the result from calculation reveals that in practical production it is generally poisoned by SiF4. Equilibrium conversion chart for HF→SiF4 and empirical formulas for calculating same conversion shown in this article can be used for quantitatively estimating the possibility of fluoride poisoning both in design work and in plant operation.

摘要： 本文在生产实践和前人试验研究的基础上,研究了硫酸生产中氟化合物(HF和SiF_4)对含SiO_2载体的钒催化剂的毒害过程.提出催化剂的氟中毒过程主要可归结为氟形态转变的可逆过程,即:4HF+SiO_2(?)SiF_4+2H_2O用热力学方法考察二氧化硫转化器中催化剂氟中毒过程,进行反应的化学平衡计算.结果表明,在实际生产中一般多为SiF_4中毒.文中的HF→SiF_4平衡反应率图和计算平衡反应率的经验式,可在设计和生产中用来定量地估计氟中毒的可能性.