甲烷液相氧化酯化过程中非水醋酸混合溶液酸度测定

Acidity Determination of the Nonaqueous Acetic Acid Mixed Solution for the Process of Methane Oxidative Esterification

为从理论上分析非水醋酸混合溶液酸度对甲烷液相氧化酯化反应的影响,建立了Hammett指示剂-紫外可见光分光光谱法测定醋酸混合溶液酸度的方法,并考察了相同浓度下不同酸性助剂的醋酸混合溶液对甲烷液相氧化酯化反应影响。结果表明,室温下,以三氯甲烷、甲基紫分别为溶剂和指示剂,可以表征醋酸混合溶液的酸度。改变醋酸混合溶液的中酸性助剂的种类和比例,可以有效调控醋酸混合溶液的酸度,而且醋酸混合溶液的酸度与甲烷液相氧化酯化反应有一定关联。

The acidity determination of nonaqueous acetic acid mixture is of crucial significance for the process of methane liquid-phase oxidative esterification.The method of using Hammett indicator-UV-visible spectroscopy to measure the acidity of the acetic mixed solution was established,and the influence of the acetic mixed solutions having acid additives with the same concentration but of different kinds of species on the methane partial oxidation esterification reaction was investigated.The results show that,at the room temperature,the acetic mixed solution acidity can be characterized by using methyl violet and chloroform as indicator and solvent,respectively.The acidity of acetic mixed solution could be controlled by changing the kind of acid additives and the proportion of the acid additive in the acetic mixed solution.It was found that,there exists certain relationship between the acidity of acid mixed solution and the reaction of liquid-phase oxidative esterification of the methane.