Industrial Gas Furnace Texas City Texas

Industrial gas furnace Texas City TexasDry 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.

Industrial gas furnace Texas City TexasDry 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. Industrial gas furnace Texas City Texas

Properties Industrial gas furnace Texas City Texas

Industrial gas furnace Texas City TexasDry 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, non-flammable, with a sour zesty odor, and can lower the pH of a solution when dissolved in water, forming carbonic acid (H₂CO₃).

Comparison of phase diagrams of carbon dioxide (red) and water (blue) as a log-lin chart with phase transitions points at 1-atmosphere Industrial gas furnace Texas City Texas

Industrial gas furnace Texas City TexasAt 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. 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. Industrial gas furnace Texas City Texas

The density of dry ice varies, but usually ranges between about 1.4 and 1.6 g/cm (87 and 100 lb/cu ft). The low temperature and direct sublimation to a gas make 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). Industrial gas furnace Texas City Texas

Dry ice is non-polar, with a dipole moment of zero, so attractive intermolecular van der Waals forces operate. The composition results in low thermal and electrical conductivity. Industrial gas furnace Texas City Texas

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. 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 the 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. Industrial gas furnace Texas City Texas

The alternative name “Cardice” is a registered trademark of Air Liquide UK Ltd. It is sometimes written as “card ice”. Industrial gas furnace Texas City Texas

Manufacture Industrial gas furnace Texas City Texas

Sublimation of dry ice when placed on the surface of the water at room temperature Industrial gas furnace Texas City Texas

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 the 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. Industrial gas furnace Texas City Texas

Applications Industrial gas furnace Texas City Texas

An ice cream cart Industrial gas furnace Texas City Texas

Sublimation Industrial gas furnace Texas City Texas

Dry ice in water Industrial gas furnace Texas City Texas

When dry ice is placed in water, sublimation accelerated, and slow-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). Industrial gas furnace Texas City Texas

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. Industrial gas furnace Texas City Texas

Plumbers use equipment that forces pressurized 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. Industrial gas furnace Texas City Texas

Dry ice can be used as bait to trap mosquitoes, bedbugs, and other insects, due to their attraction to carbon dioxide. Industrial gas furnace Texas City Texas

Tiny dry ice pellets can be used to fight fire by both cooling fuel and suffocating the fire by excluding oxygen. Industrial gas furnace Texas City Texas

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 gas furnace Texas City Texas

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. Industrial gas furnace Texas City Texas

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. Industrial gas furnace Texas City Texas

Dry ice is also useful for the de-gassing of flammable vapors 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 vapors. Industrial gas furnace Texas City Texas

The removal and fitting of cylinder liners in large engines require 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. Industrial gas furnace Texas City Texas

It is also useful as a cutting fluid. Industrial gas furnace Texas City Texas

Scientific Industrial gas furnace Texas City Texas

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. Industrial gas furnace Texas City Texas

Dry ice bombs Industrial gas furnace Texas City Texas

Dry ice bomb Industrial gas furnace Texas City Texas

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 to cause 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. Industrial gas furnace Texas City Texas

Extraterrestrial occurrence Industrial gas furnace Texas City Texas

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. Industrial gas furnace Texas City Texas

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. Industrial gas furnace Texas City Texas

Safety Industrial gas furnace Texas City Texas

Dry ice pellet subliming in water, releasing thick white fog. Industrial gas furnace Texas City Texas

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-phrase S9 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. Industrial gas furnace Texas City Texas

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 especially, 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. Industrial gas furnace Texas City Texas

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