can you explain the first process just mentioned?
It  is the separation of a mixture into its component parts, or fractions.
Fractional distillation
Fractional distillation is the separation of a mixture into its component parts, or fractions.
how are saturn's moon titan and neptune's triton similar Both of them are geologically active. who discovered the triton? William Lassell. when was it discovered? 10 October,1846. can you mention some physical characteristics of this natural satellite? Triton's crust consists of 55% nitrogen ice with other ices mixed in. Water ice comprises 15–35% and frozen carbon dioxide the remaining 10–20%. Its surface area is 23 million km. how is the atmosphere there? It has a tenuous nitrogen atmosphere, with trace amounts of carbon monoxide and small amounts of methane near its surface. can you tell me when was this first chemical element you just mentioned discovered? It has the symbol N and atomic number 7. where is this element can be found? From nitre (potassium nitrate, saltpetre) and sodanitre (sodium nitrate, Chilean saltpetre). can you tell me how this can be produce? By the fractional distillation of liquid air, or by mechanical means using gaseous air.
wiki:19531501
Fractional distillation [SEP] Introduction
Fractional distillation is the separation of a mixture into its component parts, or fractions. Chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vaporize. It uses distillation to fractionate. Generally the component parts have boiling points that differ by less than 25 °C (45 °F) from each other under a pressure of one atmosphere. If the difference in boiling points is greater than 25 °C, a simple distillation is typically used.