Dry ice, sometimes referred to as "cardice" (chiefly by British chemists), is the solid form of carbon dioxide. It is used primarily as a cooling agent. 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 where mechanical cooling is unavailable.
Dry ice sublimates at 194.65 K (−78.5 °C; −109.3 °F), at Earth atmospheric pressures. This extreme cold makes the solid dangerous to handle without protection due to burns caused by freezing (frostbite). 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.
For supplementary chemical data, see Carbon dioxide data.
Dry ice is the solid form of carbon dioxide (CO2), a molecule consisting of a single carbon atom bonded to two oxygenatoms. Dry ice is colorless, non-flammable, with a sour zesty odor, and can lower the pH of a solution when dissolved in water, forming carbonic acid (H2CO3).
At pressures below 5.13 atm and temperatures below −56.4 °C (−69.5 °F) (the triple point), CO2 changes from a solid to a gas with no intervening liquid form, through a process called sublimation.[note 1] The opposite process is called deposition, where CO2 changes from the gas to solid phase (dry ice). At atmospheric pressure, sublimation/deposition occurs at −78.5 °C (−109.3 °F) or 194.65 K.
The density of dry ice varies, but usually ranges between about 1.4 and 1.6 g/cm3 (87 and 100 lb/cu ft). 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. Its enthalpy of sublimation is 571 kJ/kg (25.2 kJ/mol).
Dry ice is non-polar, with a dipole moment of zero, so attractive intermolecularvan der Waals forces operate. The composition results in low thermal and electrical conductivity.
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. In his experiments, it was 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. In 1925, this solid form of CO2 was trademarked by the DryIce Corporation of America as "Dry ice", thus leading to its common name. That same year the DryIce Co. sold the substance commercially for the first time; marketing it for refrigerating purposes.
The alternative name "Cardice" is a registered trademark of Air Liquide UK Ltd. It is sometimes written as "card ice".
Dry ice is easily manufactured. First, gases with a high concentration of carbon dioxide are produced. 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. 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.
A teaching laboratory demonstration for the production of dry ice is to use a 15 lb aluminum carbon dioxide fire extinguisher with a porous fabric collecting bag over the nozzle. The Joule-Thomson expansion of the gas lowers the temperature enough to produce an approximate 50/50 mixture of CO2 gas and dry ice snow also called dust that is collected in the bag. This is an inefficient process, and unsuitable for even lab-scale production. The expansion is inefficient, fire extinguishers are an expensive way to buy carbon dioxide, especially when a signed and dated fire extinguisher certification is required.
Dry ice is typically produced in three standard forms: large blocks, cylindrical small (5/8 or 1/2 inch diameter) pellets and cylindrical tiny (1/8 inch diameter), 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 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 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.
The most common use of dry ice is to preserve food, using non-cyclic refrigeration.
It is frequently used to package items that must remain cold or frozen, such as ice cream or biological samples, without the use of mechanical cooling.
Dry ice can be used to flash-freeze food or laboratory biological samples,carbonate beverages, make ice cream, solidify oil spills 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 theaters, 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. Dry ice is useful in theater productions that require dense fog effects. The fog originates from the bulk water into which the dry ice is placed, and not from atmospheric water vapor (as is commonly assumed).
It is occasionally used to freeze and remove warts. However, liquid nitrogen performs better in this role, since it is colder so requires less time to act, and less pressure. Dry ice has fewer problems with storage, since it can be generated from compressed carbon dioxide gas as needed.
Plumbers use equipment that forces pressurised liquid CO2 into a jacket around a pipe. The dry ice formed causes the water to freeze, forming an ice plug, allowing them to perform repairs without turning off the water mains. This technique can be used on pipes up to 4 inches (100 mm) in diameter.
Dry ice can be used as bait to trap mosquitoes, bedbugs, and other insects, due to their attraction to carbon dioxide.
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.
Tiny dry ice pellets can be used to fight fire by both cooling fuel and suffocating the fire by excluding oxygen.
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.
Dry ice can be used for loosening asphalt floor tiles or car sound deadening material making it easy to prise off, as well as freezing water in valveless pipes to enable repair.
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. 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.
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.
Dry-ice blasting, a form of carbon dioxide cleaning, is used in a number of industrial applications.
It is also useful as a cutting fluid.
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. Dry ice/acetone forms a cold bath of −78 °C, 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. It was widely used in experiments in the US in the 1950s and early 60s before it was replaced by silver iodide. Dry ice has the advantage of being relatively cheap and completely non-toxic. Its main drawback is the need to be delivered directly into the supercooled region of clouds being seeded.
Dry ice bombs
Main article: 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 causing a loud noise that can be avoided when a #3 rubber stopper replaces the screw on cap to make a water rocket with a two-liter bottle.
The dry ice bomb device was featured on MythBusters, episode 57 Mentos and Soda, which first aired on August 9, 2006. It was also featured in an episode of Time Warp, as well as in an episode of Archer.
Following the Mars flyby of the Mariner 4 spacecraft in 1966, scientists concluded that Mars' polar caps consist entirely of dry ice. 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. 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.
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.
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. For this reason, dry ice is assigned the S-phraseS9 in the context of laboratory safety. Industrial dry ice may contain contaminants that make it unsafe for direct contact with foodstuffs. Tiny dry ice pellets used in dry ice blast cleaning do not contain oily residues.
Although 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, when shipped by air or water, it is regulated as a dangerous good and IATA packing instruction 954 (IATA PI 954) requires that it be labeled specially, including a diamond-shaped black-and white label, UN 1845. Also, arrangements must be in place to ensure adequate ventilation so that pressure build-up does not rupture the packaging. The Federal Aviation Administration in the US allows airline passengers to carry up to 2.5 kg per person either as checked baggage or carry-on baggage, when used to refrigerate perishables.
Notes and references
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- Keyes, Conrad G (2006). Guidelines for Cloud Seeding to Augment Precipitation. American Society of Civil Engineers. ASCE Publications. ISBN 978-0-7844-0819-3.
- Verma, N. K.; Khanna, S. K.; Kapila, B. (2008). Comprehensive Chemistry for Class XI. New Delhi: Laxmi Publications. ISBN 978-81-7008-596-6. Retrieved 2009-07-31.
- McCarthy, Robert E. (1992). Secrets of Hollywood Special Effects. Boston: Focal Press. ISBN 0-240-80108-3.
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- ^Above the triple point, CO2 goes through the more familiar transitions via a liquid phase.
- ^ abYaws 2001, p. 125
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- ^Yaws 2001, p. 124
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- ^Khanna & Kapila 2008, p. 163
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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; … )
- In a patent (no. 2896) which was filed on May 16, 1831 and which was published in 1836, Adrien-Jean-Pierre Thilorier, an employee of the French "Administration des postes" (i.e., Post Office) in Paris is identified explicitly as the inventor of a machine for compressing gases which in 1829 won the French Academy of Sciences' Montyon prize for mechanics. The patent describes the machine and its performance in detail. See: (French Ministry of Commerce), "Pour le perfectionnement d'une machine à comprimer le gaz, …" (For the improvement of a machine to compress gas, …), Description des Machines et Procédés consignés dans les brevets d'invention, 30 : 251–267 (1836).
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Regular wet ice is created when water is frozen and turns from a liquid to a solid. Dry ice, on the other hand, is not water at all. It is solid carbon dioxide. However, like water, it is also colorless and odorless--and dry ice will cool your drink just like wet ice. In this experiment, we'll discover which does the job fastest.
- What are some uses for wet ice? Dry ice?
- What are the key benefits of dry ice?
- Carbon Dioxide (solid)
- Molecular composition
- Freezing temperature
- Dry ice (you can get this at your local drug store in the first-aid section)
- Wet ice (from your freezer)
- Hot beverage, like coffee or soup
- Two small plastic containers to hold the beverage
- Two larger plastic containers to hold the ice
- Two thermometers
- Kitchen scale
- Pen and paper for notes
- Either buy frozen or prepare some regular ice in the freezer.
- To keep the mass of the dry ice and wet ice equal, be sure to weigh each. Do not separate the dry ice that is in the pack! This is dangerous. Instead, add/subtract the regular wet ice.
- Put both types of ice in a plastic container.
- Heat up two containers of coffee or soup until it is hot. Stick a thermometer in each. Record this temperature.
- Set the containers containing the hot beverage inside the larger containers that has the ice inside.
- Observe as the temperature drops. Record the temperature in five-minute increments.
- So which cooled down faster? Was there even a difference?
Author: Sofia PC
Disclaimer and Safety Precautions
Warning is hereby given that not all Project Ideas are appropriate for all individuals or in all circumstances. Implementation of any Science Project Idea should be undertaken only in appropriate settings and with appropriate parental or other supervision. Reading and following the safety precautions of all materials used in a project is the sole responsibility of each individual. For further information, consult your state's handbook of Science Safety.