Conceptual

Separation of Ammonium Chloride from Sand by Sublimation in Chemistry

Sublimation is a phase transition mechanism wherein a substance transforms directly from the solid state to the gaseous state upon heating and subsequently reverts to a solid via deposition under reduced temperature conditions. This physical separation technique relies on differential volatility, allowing specific compounds with high vapor pressures at ambient or moderate temperatures to sublime while non-volatile impurities remain in the original phase. The theoretical framework belongs to thermodynamics and material science within the domain of chemical engineering processes used for purifying solids without passing through a liquid intermediate state.