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化工学报  2015 

填料塔中亚硝酸甲酯再生过程模拟

DOI: 10.11949/j.issn.0438-1157.20141300, PP. 979-986

Keywords: 亚硝酸甲酯,填料塔,数学模拟,再生,吸收

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Abstract:

在气相偶联合成草酸酯工艺过程中,亚硝酸甲酯(MN)再生过程与偶联反应有效匹配是实现整个系统绿色无污染的关键,也是影响草酸酯合成工业放大过程的关键一步。对于MN再生过程的工艺优化和宏观动力学方面进行了较多研究和报道,而对MN再生过程的数学模拟研究较少。通对MN再生过程中发生的主要化学反应进行分析简化,并结合MN再生反应动力学参数,在填料塔中建立了MN再生反应数学模型,并计算了主要工艺参数对MN收率的影响。模拟结果表明,随温度升高、气体流速增大、N2体积分数增大,MN的收率减小,液体流速增大和NO/O2摩尔比增大,MN收率增大。通过实验验证了该模型的准确性,MN收率的模拟结果与实验数据的最大相对偏差为-4.39%,为MN再生反应过程的设计和操作提供了理论依据;最后,对于两种不同的NO和O2混合方式进行了比较,通过模拟计算比较了这两种不同操作方式对MN收率的影响。

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