Technical term in chemistry and distillation for a portion of a mixture separated by boiling point.
We analyzed the fraction obtained by distillation.
This fraction contains a high concentration of the target compound.
Standard kanji spelling for a distillation fraction.
Alternate kanji form using 溜 (collect/accumulate); less common than 留分.
A technical compound using 留 from 蒸留 “distillation” and 分 “portion,” denoting a fraction separated during distillation.