Cold Trap
Cold Trap - Related Videos
10:13
Working with Hot and Cold Sources
0 Views •
2023
Source: Robert M. Rioux & Suprita Jharimune, Pennsylvania State University, University Park, PA Working with extreme temperatures, both high and low, is an integral part of many laboratory operations. For many, mentioning a laboratory instantly evokes the mental picture of a Bunsen burner. Bunsen burners and hot plates are used extensively in small and large operations in research laboratories and industries, thus making it necessary for all users to be aware of their safe handling...
05:57
Dean-Stark Trap
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2023
Source: Vy M. Dong and Jan Riedel, Department of Chemistry, University of California, Irvine, CA A Dean-Stark trap is a special piece of glassware, which allows the collection of water during a reaction through an azeotropic distillation. The desire to collect water from a reaction can have various reasons. It can drive the equilibria in reactions, where water is formed as a byproduct. According to Le Chatelier's principle, a change in temperature, pressure, concentration, or volume will cause...
01:41
Social Traps
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2020
Social traps are negative situations where people get caught in a direction or relationship that later proves to be unpleasant, with no easy way to back out of or avoid. The concept was orignally introduced by John Platt who applied psychology to Garrett Hardin's "Tragedy of the Commons", where in New England herd owners could let their cattle graze in the common ground. This situation seems like a good idea, but an individual could have an advantage. If they owned more cows, the larger...
08:37
Liver Cold Storage and Transplantation in the Cold-Adaptive Daurian Ground Squirrels
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2025
Here, we present a protocol to establish a long-term liver cold storage and transplantation model in Daurian ground squirrel (DGS), which has been technically challenging in standard rodent models.
11:45
Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Cited by 19 •
2017
This paper presents a microfabrication methodology for surface ion traps, as well as a detailed experimental procedure for trapping ytterbium ions in a room-temperature environment.
FAQs
Selective capture comes from the relationship between the trap surface temperature and the vapor’s phase-change point. When the surface is below that compound’s condensation or freezing point, the vapor becomes a liquid or solid and stays in the vessel. Vapors that do not meet this temperature condition are less effectively retained, so temperature directly influences collection.
Coolant choice matters because it determines the temperature the trap can maintain. A coolant that produces a sufficiently cold surface improves capture for vapors with lower condensation or freezing points, whereas inadequate cooling allows more vapor to pass through. In practice, researchers match coolant performance to the compounds expected in the gas stream.
Cold Trap placement before the vacuum pump creates a protective barrier against condensable solvent vapors and corrosive materials. Capturing these substances upstream reduces the amount entering downstream equipment, which helps limit contamination and potential damage. This protection is especially relevant when vacuum operations generate volatile compounds that could otherwise travel through the system.
Collection efficiency is governed primarily by trap temperature and coolant selection, but the chemical identity of the vapor also matters because each compound has its own condensation or freezing point. A trap works best when its surface remains below the relevant phase-change point. These variables determine whether material is collected as liquid, solid, or not retained effectively.
During rotary evaporation, distillation, or freeze-drying, the trap is positioned in the vacuum path so vapors leaving the experiment encounter the cooled surface before downstream equipment. The operating approach is to select suitable cooling, maintain the required low temperature, and retain the condensed material in the vessel. This supports pump protection and cleaner vacuum operation.
Recovered condensate can provide a practical way to collect volatile material, while trapping can also help separate it from substances that remain in the gas stream under the chosen conditions. In chemistry, this makes the device useful not only for protecting pumps but also for reducing contamination and supporting more accurate experimental results.