para isomer 对位异构体
The strong acid is the active site for creaking para-diethylbenzene and ethylbenzene and it has little effect on p-isomer selectivity of disproportionation and isomerization.
强酸位是对二乙苯和乙苯裂化的活性中心，而对歧化和异构化反应生成对位异构体的选择性影响不大。
To meet the requirement of crystallization separation process for para-acetaminophenylacetate ethyl, molecular distillation was firstly used to separate the isomer.
为满足对乙酰氨基苯乙酸乙酯后续结晶分离工艺的需要，将分子蒸馏技术首次应用于同分异构体的预分离。
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