The Separation of Catechol from Carbofuran Phenol by Extractive Distillation

In this study, extractive distillation has been applied to separate catechol （CAT） from carbofuran phenol （CFP） with high purity and yield. The relative volatility of CFP to CAT was measured, and the choice of separating agents was investigated. The experimental results indicated that CFP/CAT is an azeotropic system with an azeotropic point at 93.40℃/0.400 kPa and an azeotropic mixture containing 49.96% of CFP and 50.04% of CAT. Data from the determination of the relative volatility have shown that separating agents such as diglycol and 4-butylcatechol （4-TBC） are able to increase the relative volatility up to 1.90. In one shot process batch extractive distillation of CFP mixture with 3% （by mass） diglycol as separating agent, the purity and yield of the obtained CFP was 99.0% and 95.0%, respectively, while the distillation without separating agent provided a purity and yield of only 98.0% and 90.0%, respectively, There was no residual separating agent found in the product.

在这研究，引得出的蒸馏被使用了用高纯净和产量从 carbofuran 酚(CFP ) 分开儿茶酚(猫) 。到猫的 CFP 的相对轻快被测量，并且分开代理人的选择被调查。试验性的结果显示 CFP/CAT 是有在 93.40 &#xb0 的一个 azeotropic 点的一个 azeotropic 系统； C/0.400 kPa 和包含 49.96% CFP 和 50.04% 猫的 azeotropic 混合物。从相对轻快的决心的数据显示出那分开象 diglycol 那样的代理人， 4-butylcatechol (4-TBC ) 能增加相对轻快直到 1.90。在一射击过程批有 3% 的 CFP 混合的引得出的蒸馏(由质量) 分别地，当没有分开代理人的蒸馏提供了纯净和收益时， diglycol 作为分开获得的 CFP 的代理人，纯净和产量是 99.0% 和 95.0% 仅仅 98.0% 和 90.0% 分别地。没有剩余，分开在产品发现的代理人。