1.The recycle theory was introduced briefly in this article. Additionally, the application of this theory was shown with the example of separating para-xylene from mixed xylenes.

前言： 比較簡明的介紹了再循環(huán)理論，并以對二甲苯分離為例示范其使用方法。

2.The recycle theory was introduced briefly in this article. Additionally, the application of this theory was shown with the example of separating para-xylene from mixed xylenes.

前言： 比較簡明的介紹了再循環(huán)理論，并以對二甲苯分離為例示范其使用方法。

3.Another important group of petrochemical raw materials are the aromatic compounds, principally benzene, toluene and xylenes, which are mainly produced by catalytic reforming.

另一組重要的石油化學(xué)品原料是芳香烴化合物，主要是苯、甲苯和二甲苯，主要由催化重整制得。

4.Its isomerization is aimed at increasing the yields of para - and ortho - xylenes.

其異構(gòu)化的目的是提高對二甲苯和鄰二甲苯的收率。