重馏 meaning in English

double distilled

Method for aromatic types analysis of gas - oils aromatic fractios by mass spectrometry
重馏份石油芳香烃族组成质谱分析方法
Method for hydrocarbon types analysis of gas - oil saturates fraction by mass spectrometry
重馏份石油饱和烃族组成质谱分析方法
The treatments are : caustic treating for light gasoline , selective hydrotreating for medium gasoline and conventional hydrotreating for heavy gasoline
最轻馏份经苛性碱处理，中间馏份经选择性加氢处理，而最重馏份则经一般加氢处理来脱硫。