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During the liquid-phase oxidation of p-xylene, over-oxidation of reactant, intermediates and solvent to carbon dioxide and carbon monoxide is generally known as the burning side reaction. Batch and semi-continuous experiments were carried out, and the experimental data of the burning side reaction were analyzed and reported in this paper. The results showed that the rates of burning side reactions were proportional to the rates of the main re-action, but decreased with the increasing concentrations of reactant and intermediates. The inter-stimulative and competitive relationship between the burning side reaction and the main reaction was confirmed, and the rates of the burning side reaction could be described with some key indexes of the main reaction. According to the mecha-nism of the side reactions and the kinetics model of main reaction which were proposed and tested in the previous papers, a kinetic model of the burning side reactions involving some key indexes of the main reaction was devel-oped, and the parameters were determined by data fitting of the COx rate curves. The obtained kinetic model could describe the burning side reactions adequately. 相似文献
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加合结晶是一种新型的结晶分离方法.对三种芳香羧酸(对、邻、间苯二甲酸,TA、OPA、IPA)在6种溶剂中的结晶物质进行了分光光度法测定、热重分析和XRD表征,发现TA在6种溶剂中的结晶3种是普通结晶,3种是溶剂与溶质-同析出的加合结晶,其中又只有TA-二甲基乙酰胺(DMAC)、TA-N-甲基吡咯烷酮(NMP)两种加合结... 相似文献
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采用高效液相色谱(HPLC)、热重(TG)、X线衍射(XRD)、分光光度法等方法对溶剂N 甲基吡咯烷酮(NMP)与对苯二甲酸(TA)形成的加合物晶体进行表征,所形成的加合物是1个TA分子与2个NMP分子通过O—H…O的氢键作用形成的结晶体,该晶体在50 ℃以上不稳定,易受热分解而脱除溶剂.通过计算得出,TA与NMP之间的氢键键能为-87.8 KJ/mol,属于较强类型的氢键作用.研究表明,加合结晶可以除去TA固体残渣中97%以上的有色杂质,是一种新型的结晶分离方法. 相似文献