共萃取是指某一元素(通常为微量元素)单独存在时不被萃取或奉取率很低，但有另一元素(通常为常量元素)存在时，难萃元素的萃取率大增，这一现象称之为共萃取。
以龙眼核为研究材料，利用GC-MS分析了龙眼核乙酸乙酯萃取物的挥发性成分，共分离鉴定出了40个组分。
With longan seed as the study material, volatile constituents of longan seed soluble in ethyl acetate were analyzed with GC -MS, and 40 components were determined.
加恒沸剂共沸蒸馏和乙酸萃取反应精馏过程。 乙醛缩合法生产乙酸乙酯的三塔连续精馏过程以及乙烯与乙酸气相催化反应的加水精制工艺过程。
Three-tower continuous distillation process of ethyl acetate from aldehyde condensation and purification by gas-phase oxidation of acetic acid and ethylene were also discussed.
对于共沸隔壁塔的研究，本文采取了与萃取隔壁塔相同的研究方法和步骤，所采用的案例为异丙醇脱水。
As for the study of ADWC, the same research methods as those of EDWC are introduced and the case assessed in this paper is isopropanol dehydration.
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