Simple Sublimation
Simple Sublimation - Related Videos
05:39
Purification of Ferrocene by Sublimation
0 Views •
2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University Sublimation, the direct phase transition of a solid into a gas without first becoming a liquid, takes place at temperatures and pressures lower than that of the compound's triple point (Figure 1).The process of sublimation can be utilized to purify both organic and inorganic solids. During the purification technique, a solid is heated directly into the gas-phase. All non-volatile impurities are left behind while the...
02:33
Phase Transitions: Sublimation and Deposition
0 Views •
2020
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
01:03
Sublimation
0 Views •
2024
Sublimation is the direct transformation of a solid to a gaseous state. For instance, at standard pressure and room temperature, solid carbon dioxide sublimes to gaseous carbon dioxide. The phase diagram depicts the conditions required for sublimation. This process occurs at the solid-gas phase boundary and is not observed above the triple point of the substance. The reverse of sublimation is called deposition, where a gaseous substance condenses directly into a solid. Sublimation and...
08:36
Sublimation of DAN Matrix for the Detection and Visualization of Gangliosides in Rat Brain Tissue for MALDI Imaging Mass Spectrometry
0 Views •
Cited by 43 •
2017
A protocol for the sublimation of DAN matrix onto rat brain tissue for the detection of gangliosides using MALDI Imaging Mass Spectrometry is presented.
03:13
Simple Distillation - Concepts
0 Views •
2020
Distillation of a Miscible Mixture Some liquids will evaporate entirely over time if left in an open container at room temperature. However, this evaporation process can be significantly accelerated if the liquid is heated. As the liquid is heated, the molecules within it gain the energy to escape the liquid phase and transition into the gas phase in the form of bubbles. This phenomenon is called boiling. Vapor Pressure Consider a closed container of liquid. Initially, some of this liquid...
FAQs
Vapor pressure determines which component can enter the gas phase during heating. In Simple Sublimation, the desired solid must have sufficiently high vapor pressure under the chosen conditions, while less volatile substances do not vaporize as readily. This difference in volatility creates the separation, allowing the more readily vaporized component to be recovered separately after cooling.
Temperature selection controls the balance between vaporization and retention of impurities. Heating must provide conditions in which the sublimable component vaporizes, but the less volatile materials remain solid. If that contrast is not present, the mixture will not separate effectively. Thus, the method depends on different components responding differently to the same heating conditions.
Cooling is the recovery stage rather than merely the end of heating. Once the vaporized component reaches a cooler surface, it deposits as a solid again, producing an isolated material. This return to the solid state makes it possible to collect the substance separately from the original mixture and supports purification without requiring a liquid intermediate.
A basic workflow begins by heating the solid mixture under conditions that favor vaporization of one component. The resulting vapor is allowed to contact a cooler surface, where it deposits. The collected solid can then be separated from the nonvolatile residue left behind. This sequence combines selective heating, vapor movement, cooling, and collection.
Chemists apply Simple Sublimation when a mixture contains a compound that can vaporize directly from the solid while accompanying materials remain behind. The technique can isolate sublimable compounds and remove impurities, so it serves both separation and purification purposes. Its usefulness depends on a meaningful volatility difference between the component of interest and the rest of the mixture.
Iodine and naphthalene provide familiar chemistry examples because their purification can be described through a solid-to-vapor-to-solid sequence. Dry ice illustrates the phase-change principle in a different context: solid carbon dioxide converts directly into gas. Together, these examples connect laboratory purification with a visible demonstration of phase behavior and vapor pressure.