fractional distillation process

例句：

1. 1. Thefractional distillation process is crucial for the purification of crude oil.
   分数蒸馏过程对于原油的提纯至关重要。
2. 2.The fractional distillation process has been optimized to improve efficiency.
   已经对分数蒸馏过程进行了优化以提高效率。
3. 3. The fractional distillation process involves heating a mixture of chemicals and separating the resulting vapors.
   分数蒸馏过程涉及加热化学物质混合物并分离产生的蒸汽。