Correlations and selection of optimum conditions for chromatography of alkylcyclohexanecarboxylate production process
DOI:
https://doi.org/10.15587/1729-4061.2016.60307Keywords:
alkylcyclohexanecarboxylates, gas-liquid chromatography, free energy linearity principleAbstract
A number of esters of alkylcyclohexanecarboxylic acids are synthesized. The NMR spectral analysis of the synthesized esters is carried out, and their physicochemical characteristics are identified. Optimum parameters of the isothermal gas-liquid chromatography to analyze the reaction mixtures, the interaction of acrylates and 2,3-dimethyl-1,3-butadiene are determined.
The evaluation of the efficiency of the chromatography system and resolution settings is performed. The proposed chromatography conditions provide almost complete separation of the reaction mixture substances, and the analysis time does not exceed 15 min. The free energy linearity principle for the quantitative description of the relationship between the logarithms of the retention time of the substances, which are products of cycloaddition reaction of acrylates and 2,3-dimethyl-1,3-butadiene under gas chromatography and empirical parameters of substances: polarization, polarity, basicity, electrophilicity, molar volume and enthalpy of vaporization is applied. It is shown that in all cases the polarization ability of substances plays the greatest role in the correlations of the retention time logarithms, and the enthalpy of vaporization appeared a minor parameter. The developed method of chromatography analysis is used to determine the optimum conditions of the alkylcyclohexanecarboxylate production process.
The possibility of using correlations for predicting and determining the optimum conditions for chromatography analysis to monitor the processes of producing a number of esters of alkylcyclohexanecarboxylic acids is shown.References
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Copyright (c) 2016 Игорь Петрович Полюжин, Ольга Игоревна Маршалок, Наталия Мироновна Витрикуш, Галина Алексеевна Маршалок, Игорь Юрьевич Пыриг
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