Dry ice

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Subliming dry ice pellet, with white frost on the surface Dry Ice 1.jpg
Subliming dry ice pellet, with white frost on the surface

Dry ice means the solid form of carbon dioxide. It is commonly used for temporary refrigeration as CO2 does not have a liquid state at normal atmospheric pressure and sublimes directly from the solid state to the gas state. It is used primarily as a cooling agent, but is also used in fog machines at theatres for dramatic effects. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere). It is useful for preserving frozen foods (such as ice cream) where mechanical cooling is unavailable.

Contents

Dry ice sublimes at 194.7 K (−78.5 °C; −109.2 °F) at Earth atmospheric pressure. This extreme cold makes the solid dangerous to handle without protection from frostbite injury. While generally not very toxic, the outgassing from it can cause hypercapnia (abnormally elevated carbon dioxide levels in the blood) due to buildup in confined locations.

Properties

Comparison of phase diagrams of carbon dioxide (red) and water (blue) as a log-lin chart with phase transitions points at 1 atmosphere pressure Comparison carbon dioxide water phase diagrams.svg
Comparison of phase diagrams of carbon dioxide (red) and water (blue) as a log-lin chart with phase transitions points at 1  atmosphere pressure

Dry ice is the solid form of carbon dioxide (CO2), a molecule consisting of a single carbon atom bonded to two oxygen atoms. Dry ice is colorless, odorless, and non-flammable, and can lower the pH of a solution when dissolved in water, forming carbonic acid (H2CO3). [1]

At pressures below 5.13 atm and temperatures below−56.4 °C (216.8 K; −69.5 °F) (the triple point), CO2 changes from a solid to a gas with no intervening liquid form, through a process called sublimation. [a] The opposite process is called deposition, where CO2 changes from the gas to solid phase (dry ice). At atmospheric pressure, sublimation/deposition occurs at 194.7 K (−78.5 °C; −109.2 °F). [2]

The density of dry ice increases with decreasing temperature and ranges between about 1.55 and 1.7 g/cm3 (97 and 106 lb/cu ft) below 195 K (−78 °C; −109 °F). [3] The low temperature and direct sublimation to a gas makes dry ice an effective coolant, since it is colder than water ice and leaves no residue as it changes state. [4] Its enthalpy of sublimation is 571 kJ/kg (25.2 kJ/mol, 136.5 calorie/g).

Dry ice is non-polar, with a dipole moment of zero, so attractive intermolecular van der Waals forces operate. [5] The composition results in low thermal and electrical conductivity. [6]

History

It is generally accepted that dry ice was first observed in 1835 by French inventor Adrien-Jean-Pierre Thilorier (1790–1844), who published the first account of the substance. [7] [8] In his experiments, he noted that when opening the lid of a large cylinder containing liquid carbon dioxide, most of the liquid carbon dioxide quickly evaporated. This left only solid dry ice in the container. In 1924, Thomas B. Slate applied for a US patent to sell dry ice commercially. Subsequently, he became the first to make dry ice successful as an industry. [9] In 1925, this solid form of CO2 was trademarked by the DryIce Corporation of America as "Dry ice", leading to its common name. [10] That same year the DryIce Co. sold the substance commercially for the first time, marketing it for refrigeration purposes. [9]

Manufacture

Sublimation of dry ice when placed on water at room temperature

Dry ice is easily manufactured. [11] [12] The most common industrial method of manufacturing dry ice starts with a gas having a high concentration of carbon dioxide. Such gases can be a byproduct of another process, such as producing ammonia from nitrogen and natural gas, oil refinery activities or large-scale fermentation. [12] Second, the carbon dioxide-rich gas is pressurized and refrigerated until it liquefies. Next, the pressure is reduced. When this occurs some liquid carbon dioxide vaporizes, causing a rapid lowering of temperature of the remaining liquid. As a result, the extreme cold causes the liquid to solidify into a snow-like consistency. Finally, the snow-like solid carbon dioxide is compressed into small pellets or larger blocks of dry ice. [13] [14]

Dry ice is typically produced in three standard forms: large blocks, small (1⁄2 or 5⁄8 in [13 or 16 mm] diameter) cylindrical pellets and tiny (1⁄8 inch [3.2 mm] diameter) cylindrical, high surface to volume pellets that float on oil or water and do not stick to skin because of their high radii of curvature. Tiny dry ice pellets are used primarily for dry ice blasting, quick freezing, fire fighting, oil solidifying and have been found to be safe for experimentation by middle school students wearing appropriate personal protective equipment such as gloves and safety glasses. A standard block weighing approximately 30 kg (66 lb)[ citation needed ] covered in a taped paper wrapping is most common. These are commonly used in shipping, because they sublime relatively slowly due to a low ratio of surface area to volume. Pellets are around 1 cm (0.4 in) in diameter and can be bagged easily. This form is suited to small scale use, for example at grocery stores and laboratories where it is stored in a thickly insulated chest. [15] Density of pellets is 60–70% of the density of blocks. [16]

Dry ice is also produced as a byproduct of cryogenic air separation, an industry primarily concerned with manufacturing extremely cold liquids such as liquid nitrogen and liquid oxygen. In this process, carbon dioxide liquefies or freezes at a far higher temperature compared to that needed to liquefy nitrogen and oxygen. The carbon dioxide must be removed during the process to prevent dry ice from fouling the equipment, and once separated can be processed into commercial dry ice in a manner similar to that described above.

Applications

Commercial

An ice cream cart Ice cream cart - geograph.org.uk - 1485853.jpg
An ice cream cart

The most common use of dry ice is to preserve food, [1] using non-cyclic refrigeration.

Sublimation Dry ice in cup.jpg
Sublimation
Dry ice in water Dry Ice in Water.jpg
Dry ice in water

It is frequently used to package items that must remain cold or frozen, such as ice cream or biological samples, in the absence of availability or practicality of mechanical cooling.

Dry ice is critical in the deployment of some vaccines, which require storage at ultra-cold temperatures along their supply line. [17]

Dry ice can be used to flash-freeze food [18] or laboratory biological samples, [19] carbonate beverages, [18] make ice cream, [20] solidify oil spills [21] and stop ice sculptures and ice walls from melting.

Dry ice can be used to arrest and prevent insect activity in closed containers of grains and grain products, as it displaces oxygen, but does not alter the taste or quality of foods. For the same reason, it can prevent or retard food oils and fats from becoming rancid.

When dry ice is placed in water, sublimation is accelerated, and low-sinking, dense clouds of smoke-like fog are created. This is used in fog machines, at theatres, haunted house attractions, and nightclubs for dramatic effects. Unlike most artificial fog machines, in which fog rises like smoke, fog from dry ice hovers near the ground. [14] Dry ice is useful in theatre productions that require dense fog effects. [22] The fog originates from the bulk water into which the dry ice is placed, and not from atmospheric water vapor (as is commonly assumed). [23]

It is occasionally used to freeze and remove warts. [24] However, liquid nitrogen performs better in this role, as it is colder, thereby requiring less time to act, and needs less pressure to store. [25] Dry ice has fewer problems with storage, since it can be generated from compressed carbon dioxide gas as needed. [25]

In plumbing, dry ice is used to cut off water flow to pipes to allow repairs to be made without shutting off water mains. Pressurised liquid CO2 is forced into a jacket wrapped around a pipe, which in turn causes the water inside to freeze and block the pipe. When the repairs are done, the jacket is removed and the ice plug melts, allowing the flow to resume. This technique can be used on pipes up to 4 inches or 100 mm in diameter. [26]

Dry ice can be used as bait to trap mosquitoes, bedbugs, and other insects, due to their attraction to carbon dioxide. [27]

It can be used to exterminate rodents. This is done by dropping pellets into rodent tunnels in the ground and then sealing off the entrance, thus suffocating the animals as the dry ice sublimates. [28]

Tiny dry ice pellets can be used to fight fire by both cooling fuel and suffocating the fire by excluding oxygen. [29]

The extreme temperature of dry ice can cause viscoelastic materials to change to glass phase. Thus, it is useful for removing many types of pressure sensitive adhesives.

Industrial

Dry ice blasting used for cleaning a rubber mold Rubbermold.jpg
Dry ice blasting used for cleaning a rubber mold
Dry ice blasting used for cleaning electrical installations Ciscenje instalacija suhim ledom.jpg
Dry ice blasting used for cleaning electrical installations

Dry ice can be used for loosening asphalt floor tiles or car sound deadening material, making them easy to prise off, [30] as well as freezing water in valveless pipes to enable repair. [31]

One of the largest mechanical uses of dry ice is blast cleaning. Dry ice pellets are shot from a nozzle with compressed air, combining the power of the speed of the pellets with the action of the sublimation. This can remove residues from industrial equipment. Examples of materials removed include ink, glue, oil, paint, mold and rubber. Dry ice blasting can replace sandblasting, steam blasting, water blasting or solvent blasting. The primary environmental residue of dry ice blasting is the sublimed CO2, thus making it a useful technique where residues from other blasting techniques are undesirable. [32] Recently, blast cleaning has been introduced as a method of removing smoke damage from structures after fires.

Dry ice is also useful for the de-gassing of flammable vapours from storage tanks — the sublimation of dry ice pellets inside an emptied and vented tank causes an outrush of CO2 that carries with it the flammable vapours. [33]

The removal and fitting of cylinder liners in large engines requires the use of dry ice to chill and thus shrink the liner so that it freely slides into the engine block. When the liner then warms up, it expands, and the resulting interference fit holds it tightly in place. Similar procedures may be used in fabricating mechanical assemblies with a high resultant strength, replacing the need for pins, keys or welds. [34]

Dry ice has found its application in construction for freezing soil, serving as an effective alternative to liquid nitrogen. [35] This method reduces the soil temperature to approximately -70 to -74 °C, rapidly freezing the groundwater. As a result, the soil's strength and impermeability significantly increase, [36] which is essential for the safe execution of underground construction projects. [37]

It is also useful as a cutting fluid.

Scientific

In laboratories, a slurry of dry ice in an organic solvent is a useful freezing mixture for cold chemical reactions and for condensing solvents in rotary evaporators. [38] Dry ice and acetone forms a cold bath of −78 °C (−108 °F; 195 K), which can be used for instance to prevent thermal runaway in a Swern oxidation.

The process of altering cloud precipitation can be done with the use of dry ice. [39] It was widely used in experiments in the US in the 1950s and early 1960s before it was replaced by silver iodide. [39] Dry ice has the advantage of being relatively cheap and completely non-toxic. [39] Its main drawback is the need to be delivered directly into the supercooled region of clouds being seeded. [39]

Dry ice bombs

Dry ice bomb Dry Ice Bomb.jpg
Dry ice bomb

A "dry ice bomb" is a balloon-like device using dry ice in a sealed container such as a plastic bottle. Water is usually added to accelerate the sublimation of the dry ice. As the dry ice sublimes, pressure increases, causing the bottle to burst with a loud noise. The screw cap can be replaced with a rubber stopper to make a water rocket.

The dry ice bomb device was featured on MythBusters , episode 57 Mentos and Soda, which first aired on August 9, 2006. [40] It was also featured in an episode of Time Warp , as well as in an episode of Archer .

Extraterrestrial occurrence

Following the Mars flyby of the Mariner 4 spacecraft in 1966, scientists concluded that Mars' polar caps consist entirely of dry ice. [41] However, findings made in 2003 by researchers at the California Institute of Technology have shown that Mars' polar caps are almost completely made of water ice, and that dry ice only forms a thin surface layer that thickens and thins seasonally. [41] [42] A phenomenon named dry ice storms was proposed to occur over the polar regions of Mars. They are comparable to Earth's thunderstorms, with crystalline CO2 taking the place of water in the clouds. [43] Dry ice is also proposed as a mechanism for the geysers on Mars. [44]

In 2012, the European Space Agency's Venus Express probe detected a cold layer in the atmosphere of Venus where temperatures are close to the triple point of carbon dioxide and it is possible that flakes of dry ice precipitate. [45]

Observations from the Uranus flyby by Voyager 2 indicates that dry ice is present on the surface of its large moons Ariel, [46] Umbriel [46] and Titania. [46] Scientists speculate that the magnetic field of Uranus contributes to the generation of CO2 ice on the surfaces of its moons. [47] Voyager 2 observations of Neptune's moon Triton suggested the presence of dry ice on the surface, though followup observations indicate that the carbon ices on the surface are carbon monoxide but that the moon's crust is composed of a significant quantity of dry ice. [48]

Safety

Dry ice
Hazards
GHS labelling: [49]
GHS-pictogram-bottle.svg
Warning
H280
P403

Prolonged exposure to dry ice can cause severe skin damage through frostbite, and the fog produced may also hinder attempts to withdraw from contact in a safe manner. Because it sublimes into large quantities of carbon dioxide gas, which could pose a danger of hypercapnia, dry ice should only be exposed to open air in a well-ventilated environment. [30] For this reason, in the context of laboratory safety dry ice is assigned label precaution P403: "Store in a well ventilated place." Industrial dry ice may contain contaminants that make it unsafe for direct contact with food. [50] [ failed verification ] Tiny dry ice pellets used in dry ice blast cleaning do not contain oily residues.

Dry ice is assigned a UN number, a code for hazardous substances: UN 1845. [51] Dry ice is not classified as a dangerous substance by the European Union, or as a hazardous material by the United States Department of Transportation for ground transportation. [52] [51] However, in the US, it is regulated as a dangerous good when shipped by air or water. International Air Transport Association (IATA) regulations require specific diamond-shaped black-and white labelling to be placed on the package. The package must have adequate ventilation so that it will not rupture from pressure in the event that the Dry Ice begins to sublime in the packaging. [51] The Federal Aviation Administration in the US allows airline passengers to carry up to 2.5 kg (5.5 lb) per person either as checked baggage or carry-on baggage, when used to refrigerate perishables. [53]

At least one person has been killed by carbon dioxide gas subliming off dry ice in coolers placed in a car. [54] In 2020, three people were killed at a party in Moscow after 25 kg of dry ice was dumped in a pool; carbon dioxide is heavier than air, and so can linger near the ground, just above water level. [55]

Drink

Dry ice is sometimes used to give a fog effect to cocktails. One bar patron who accidentally ingested pellets from a drink suffered severe burns to his esophagus, stomach, and duodenum, causing permanent problems with eating. [56] [57] Rapid sublimation could cause gas buildup that ruptures digestive organs or suffocation. Products that contain dry ice and prevent it from being accidentally ingested eliminate these risks while producing the desired fog effect. [58]

Footnotes

  1. ↑ Above the triple point, CO2 goes through the more familiar transitions via a liquid phase.

Related Research Articles

<span class="mw-page-title-main">Carbon dioxide</span> Chemical compound with formula CO2

Carbon dioxide is a chemical compound with the chemical formula CO2. It is made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature and at normally-encountered concentrations it is odorless. As the source of carbon in the carbon cycle, atmospheric CO2 is the primary carbon source for life on Earth. In the air, carbon dioxide is transparent to visible light but absorbs infrared radiation, acting as a greenhouse gas. Carbon dioxide is soluble in water and is found in groundwater, lakes, ice caps, and seawater.

Water vapor, water vapour or aqueous vapor is the gaseous phase of water. It is one state of water within the hydrosphere. Water vapor can be produced from the evaporation or boiling of liquid water or from the sublimation of ice. Water vapor is transparent, like most constituents of the atmosphere. Under typical atmospheric conditions, water vapor is continuously generated by evaporation and removed by condensation. It is less dense than most of the other constituents of air and triggers convection currents that can lead to clouds and fog.

<span class="mw-page-title-main">Sublimation (phase transition)</span> Transition from solid to gas

Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state. The verb form of sublimation is sublime, or less preferably, sublimate. Sublimate also refers to the product obtained by sublimation. The point at which sublimation occurs rapidly is called critical sublimation point, or simply sublimation point. Notable examples include sublimation of dry ice at room temperature and atmospheric pressure, and that of solid iodine with heating.

A supercritical fluid (SCF) is a substance at a temperature and pressure above its critical point, where distinct liquid and gas phases do not exist, but below the pressure required to compress it into a solid. It can effuse through porous solids like a gas, overcoming the mass transfer limitations that slow liquid transport through such materials. SCFs are superior to gases in their ability to dissolve materials like liquids or solids. Near the critical point, small changes in pressure or temperature result in large changes in density, allowing many properties of a supercritical fluid to be "fine-tuned".

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2 sublimes at 194.65 K at Earth atmospheric pressure — that is, it transitions directly from solid to gas without an intermediate liquid stage. The uses and applications of liquid carbon dioxide include decaffeinating coffee, extracting virgin olive oil from olive paste, in fire extinguishers, and as a coolant.

References

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  2. ↑ Barber, C R (March 1966). "The sublimation temperature of carbon dioxide". British Journal of Applied Physics. 17 (3): 391–397. Bibcode:1966BJAP...17..391B. doi:10.1088/0508-3443/17/3/312. ISSN   0508-3443. Archived from the original on 2021-06-29. Retrieved 2020-11-15.
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    • The Bulletin des Lois du Royaume de France (Bulletin of the laws of the kingdom of France), 9th series, part ii, no. 92, page 74 (February 1832) lists: "24° M. Thilorier (Adrien-Jean-Pierre) employé à l'administration des postes, demeurant à Paris, place Vendôme, no 21, auquel il a été délivré le 16 mai dernier, le certificat de sa demande d'un brevet d'invention de dix ans pour le perfectionnement d'une machine à comprimer le gaz; …" (24th Mr. Thilorier (Adrien-Jean-Pierre) employed at the Post Office, residing in Paris, Place Vendôme, no. 21, where was delivered May 16th last, the certificate, by his request, for a patent of invention for ten years for the improvement of a machine to compress gas; … )
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