Solid carbon dioxide
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| Solid carbon dioxide | |
|---|---|
| Name | Solid carbon dioxide |
| Othernames | Dry ice |
| Chemical formula | CO2 |
| Appearance | White, opaque solid |
| Melting point | Sublimes at −78.5 °C (194.65 K) |
| Density | ~1.56 g/cm3 (sublimation temperature) |
| Notable properties | Low temperature, sublimation vapor |
Solid carbon dioxide is the solid phase of the chemical compound carbon dioxide, commonly known as dry ice. It plays a central role in cryogenics, refrigeration, and experimental research related to Antarctica, Jupiter, Mars, Mount Erebus, and industrial applications linked to companies such as Air Products and Chemicals, Linde plc, and Praxair. Historically, production and use intersect with developments involving Thomas Edison, Alfred Nobel, Fritz Haber, and institutions like the Royal Society and Massachusetts Institute of Technology.
Description and physical properties
Solid carbon dioxide is a white, opaque solid that sublimes directly to gas at standard pressure, exhibiting a characteristic cold surface and dense vapor cloud similar to effects used by Walt Disney, George Lucas, and theatrical productions at the Royal Albert Hall. Its crystal structure at ambient pressure is the cubic Pa3 structure studied in laboratories at CERN, Los Alamos National Laboratory, and Lawrence Livermore National Laboratory. Physical parameters are measured using techniques developed at National Institute of Standards and Technology and the International Bureau of Weights and Measures. Its density, thermal conductivity, and heat capacity are important in experiments conducted by teams from Caltech, Harvard University, and University of Cambridge.
Formation and production
Commercial production of solid carbon dioxide typically begins with byproduct CO2 streams from processes at ExxonMobil, Shell plc, BP, and large chemical plants founded by pioneers like Fritz Haber and Carl Bosch. Captured CO2 is purified and compressed using compressors and heat exchangers developed by Siemens Energy and General Electric before undergoing Joule–Thomson expansion or refrigeration cycles in systems similar to those engineered by Alstom and Bosch. Dry ice pellets and blocks are formed in machinery supplied by firms including Carrier Global and packaged for distribution to customers ranging from Pfizer and Moderna cold chains to research centers at Salk Institute and MIT Media Lab.
Phase behavior and sublimation
At pressures below the triple point (~5.2 atm), solid carbon dioxide sublimates directly to gas at −78.5 °C, a phenomenon explained through phase diagrams refined in work at Max Planck Society facilities and theoretical models influenced by Ludwig Boltzmann and Josiah Willard Gibbs. High-pressure phases (I, II, III, IV) have been explored in diamond anvil cell experiments at Argonne National Laboratory, guided by theoretical chemistry from groups at Stanford University and University of Oxford. Sublimation kinetics inform storage practices in logistical operations like those managed by FedEx and UPS for perishable shipments. Cryogenic behavior is relevant to studies at NASA and European Space Agency missions investigating volatile transport on Enceladus and Mars.
Applications and uses
Dry ice is widely used for refrigeration in the pharmaceutical cold chain for companies including Pfizer, Johnson & Johnson, and distributors servicing World Health Organization vaccine campaigns. It is applied in food preservation by corporations such as McDonald's suppliers and in flash-freezing protocols pioneered by researchers at Cold Spring Harbor Laboratory and Monell Chemical Senses Center. Industrial cleaning by CO2 blasting is performed for maintenance at facilities owned by Siemens and General Motors, while stagecraft involving fog effects draws on techniques popularized by Disney, Cirque du Soleil, and Broadway. Scientific applications span cryopreservation in labs at Scripps Research, isotope trapping in geochemistry groups at US Geological Survey, and sample cooling on missions by NASA and Roscosmos.
Safety and handling
Handling solid carbon dioxide requires compliance with occupational safety standards promulgated by agencies such as Occupational Safety and Health Administration, European Chemicals Agency, and Health and Safety Executive. Risks include cold burns, as documented in clinical reports from Mayo Clinic and Cleveland Clinic, and asphyxiation incidents investigated by emergency services like London Fire Brigade and New York City Fire Department. Transport regulations are enforced by bodies such as International Air Transport Association and U.S. Department of Transportation; incidents analogous to industrial accidents involving Union Carbide or BP have prompted stricter protocols. Training programs developed by National Institute for Occupational Safety and Health and international standards organizations emphasize ventilation, personal protective equipment, and emergency response.
Environmental and planetary occurrence
Carbon dioxide plays a key role in Earth's climate system studied by researchers at Intergovernmental Panel on Climate Change, National Aeronautics and Space Administration, and NOAA; solid-phase CO2 occurs naturally on seasonal polar caps of Mars and possibly transiently on cold bodies like Neptune moons investigated by missions from NASA and ESA. Geological sequestration efforts by corporations such as Equinor and research consortia at Carnegie Institution for Science consider CO2 phases in subsurface storage; historic projects studied by International Energy Agency inform current policy discussions at meetings like the UNFCCC Conference of the Parties. Polar studies at British Antarctic Survey and Smithsonian Institution examine interactions between CO2, ice, and ecosystems in regions including Greenland and Antarctic Peninsula.