A Kinetic Study of the Decomposition of Spent Sulfuric Acids at High Temperature

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• 作者：Dominique Schwartz ; Roger Gadiou ; Jean-Franç ; ois Brilhac ; Gilles Prado ; and Ginè ; s Martinez
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2000
• 出版时间：July 2000
• 年：2000
• 卷：39
• 期：7
• 页码：2183 - 2189
• 全文大小：209K
• 年卷期：v.39,no.7(July 2000)
• ISSN：1520-5045

文摘

Chemical industry produces and uses high sulfuric acid volumes, and many processes generatehigh spent acid (ASS) volumes. The use of ASS as starting materials contributes to the protectionof the environment. Should this alternative not be implemented, ASS volumes could representhigh amounts of wastes. The thermal oxidative cracking process starts with ASS to producecommercial grade sulfuric acids. The presence of organic and mineral pollutants in spent acidscan greatly influence the conversion yield, and this study addresses this point. The thermaldecomposition of sulfuric acid is studied in a high-temperature plug flow reactor; the influenceof temperature, oxygen concentration, and sample concentration on SO₂ formation has beenquantified. It is shown that the two last parameters have only a small influence on sulfur dioxideyield. Temperature is the main factor because of its influence on the kinetics of the conversionof SO₃ to SO₂. The second part of the study is related to the influence of the presence ofcontaminants: nitric acid and butanol. It is shown that the decomposition of HNO₃ enhancesSO₃ conversion to SO₂, the decomposition of the hydrocarbon also increases sulfur dioxide yield.