method of fractional distillation造句

Ramsay continued to search for these gases using the method of fractional distillation to separate liquid air into several components.
In 1848, Hofmann s student Charles Blachford Mansfield developed a method of fractional distillation of coal tar and separated out benzene, xylene, and toluene, an essential step towards the development of products from coal tar.
It's difficult to find method of fractional distillation in a sentence. 用method of fractional distillation造句挺难的