首页|Feasibility analysis of extracting and purifying 4-ethylguaiacol using the intermediate product of the reaction between 4-ethylguaiacol and Ca~(2+) as the extracting agent
Feasibility analysis of extracting and purifying 4-ethylguaiacol using the intermediate product of the reaction between 4-ethylguaiacol and Ca~(2+) as the extracting agent
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NSTL
A heterogeneous extracting route of 4-ethylguaiacol is constructed using the intermediate of the reaction between 4-ethylguaiacol and Ca~(2+) as the extracting agent. In this work, 4-ethylguaiacol with different concentrations (70, 80, 90, 95%) is prepared using 40 v/v% ethanol aqueous solution as the mother liquor. The extraction parameters optimization, cycle extraction and 4-ethylguaiacol purification are studied, respectively. Extracting parameters investigated are reaction temperature (4-80 °C), extraction time (5-60 min), and pH value (6.5-13). 4-ethylguaiacol extraction efficiency keeps above 90% at the optimum extracting conditions at the reaction temperature of 4-20 °C, the extraction time of 30 min, and the pH value of 6.5-10. Further cycle extraction experiments are carried out under the optimal extraction parameters using the intermediate as the extracting agent. After 36 cycle extraction times, the extraction efficiency of 4-ethylguaiacol can still reach 91.7%. Guaiacol has similar physical and chemical properties to 4-ethylguaiacol, thus it is used as an impurity to test the extraction and purification effect of the heterogeneous extracting method. With increasing the cycle extraction times from 1 to 4, 4-ethylguaiacol purity reaches more than 99% for all four mother liquors with different initial concentrations. 4-ethylguaiacol purity of 99.57% is achieved through twice cycle extraction when its initial content in the mother liquor is 95%.
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