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分子筛液相吸附法分离对—二甲苯,较一般所采用的深度冷冻法(或结晶法)具有很多的优越性。它一步即可获得纯度较高的对—二甲苯,能用作合成聚酯纤维(的确凉)的起始原料,可避免深度冷冻法过程中的结晶固体的处理、提纯,省却成套的低温设备及特种合金钢材。采用分子筛吸附法,从C_8芳香族异构体中分离对—二甲苯是一项较大的技术革新。最近,美国环球油品公司(UOP公司)宣布,其发展了一项从C_8芳香族异构体中分离出对—二甲苯的吸附方法,命名为Parex法(即:对位异构体提取法)。
Separation of p-xylene by molecular sieve liquid phase adsorption method has many advantages over the commonly used deep-freezing method (or crystallization method). It is a one-step process to obtain p-xylene with high purity, which can be used as a starting material for synthetic polyester fiber (indeed cool), which can avoid the crystallization solidification during deep freeze process and purify the complete set of cryogenic equipment And special alloy steel. Using molecular sieve adsorption, the separation of para-xylene from C_8 aromatic isomers is a major technological innovation. Recently, UCLA announced that it has developed a method for the separation of para-xylene from C_8 aromatic isomers by the Parex method (ie, the para-isomer extraction method ).