《克劳斯反应的化学平衡.ppt

* 净化气中硫化氢含量的测定 -钼蓝法 陈庆梅 2013年8月 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 方法工作原理 一 实验操作步骤 二 注意事项 目录 三 四 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 一、工作原理 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 二、实验步骤 2.1标准曲线的绘制 2.1.1 Na2S溶液的配制(20~30)mg/L (1)配制: Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 二、实验步骤 2.1.1 Na2S溶液的配制(20~30)mg/L (2)硫化氢浓度的标定: Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. CAT 二、化学平衡的本质 催化过程 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 严格讲，反应物与产物处于同一体系的反应都是可逆的 只有逆反应与正反应相比小到可以忽略不计的反应，可以粗略地认为不可逆 二、化学平衡的本质 WHY? G! Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 二、化学平衡的本质 G--吉布斯自由能 G(D) G(E) G(F) { G(D) G Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 二、化学平衡的本质 化学反应体系 吉布斯自由能 最小,是是否达 到化学平衡的 判据 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 二、化学平衡的本质 化学反应总是向抵消外力作用的方向进行 吸热反应,温度升高有利,反之亦然 体积缩小反应,加压有利,反之亦然 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 三、克劳斯反应的化学平衡 元素硫形态 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2H2S + SO2 →3/2S2 + 2H2O(550℃以上) -47KJ/mol 2H2S + SO2 →3/8S8 + 2H2O(550℃以下) +108KJ/mol { 三、克劳斯反应的化学平衡 燃烧炉 克劳斯 反应器 2H2S + SO2 →3/xSx + 2H2O 总反应式 S2 →S8 -155KJ/mol(低温下元素硫的形态转变) Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Co