Bronte Wells
Carbon dioxide is a greenhouse gas that is vital for keeping the Earth's temperature above freezing. However, human activities, particularly the burning of fossil fuels, have led to a dangerous increase in carbon dioxide levels, causing global warming and climate change. To combat this, Brigham Young University has developed a technology that freezes carbon dioxide, capturing up to 99% of CO2 emissions. This innovative approach, known as cryogenic carbon capture, offers a promising solution to curb carbon emissions and address the pressing issue of climate change. While it presents a novel idea, the effectiveness of freezing pollution as a large-scale solution remains to be seen, and it is crucial to explore various approaches to tackle the complex challenge of reducing global carbon emissions.
| Characteristics | Values |
|---|---|
| Freezing point of carbon dioxide | -78.5°C |
| Coldest recorded air temperature on Earth | -92°C |
| BYU's cryogenic carbon-capture system efficiency | 99% of CO2 from emissions captured |
| BYU's cryogenic carbon-capture system cost | Half the cost of conventional methods |
| Global atmospheric carbon dioxide level in 1958 | 315 ppm |
| Global atmospheric carbon dioxide level in 2025 | 800 ppm |
| Annual carbon dioxide growth | Associated with strong El Niños |
| Carbon dioxide concentration rise | Due to burning of fossil fuels |
| Annual emissions of carbon dioxide from burning fossil fuels in 2024 | 37.4 billion tons |
| Permafrost thawing impact | Drunken forest |
| CO2 freeze-up prevention | Use heated regulators |
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What You'll Learn
Carbon dioxide freezing point is -78.5°C
Carbon dioxide (CO2) is a greenhouse gas that is released into the atmosphere through human activities such as burning fossil fuels and deforestation. It is one of the major contributors to global warming and climate change due to its heat-trapping properties. While natural processes on Earth can absorb and regulate a certain amount of CO2, human activities have significantly increased the concentration of this gas in the atmosphere, leading to an imbalance and resulting in adverse environmental impacts.
The freezing point of carbon dioxide is -78.5°C. This is significantly lower than the coldest recorded air temperature on Earth, which has been as low as -92°C. Despite this, it is unlikely that we will witness carbon dioxide snow or frost, even at extremely low temperatures. This is because the concentration of CO2 in the atmosphere is not high enough for it to condense and form solid particles.
However, the concept of freezing pollution, specifically carbon dioxide, has been explored as a potential solution to combat climate change. Scientists, such as chemical engineering professor Baxter, have developed cryogenic carbon-capture systems that aim to separate and capture CO2 from other gases by freezing it. This technology involves cooling emissions to extremely low temperatures, such as -130°C, to condense and solidify CO2 into dry ice.
Once captured, the dry ice is heated and pressurized to transform it into a liquid state, making it safe for storage in underground aquifers or storage facilities. This process prevents carbon dioxide from escaping into the atmosphere and contributes to carbon emissions reduction. Baxter's system has been found to capture 99% of CO2 from emissions, showcasing its effectiveness in tackling climate change. While freezing pollution, specifically carbon dioxide, offers a promising approach to mitigating climate change, it is crucial to recognize that a successful solution requires global adoption and a comprehensive approach involving multiple strategies.
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CO2 snow and dry ice particles
Carbon dioxide (CO2) snow cleaning is a surface cleaning process that involves blasting a surface with small dry ice particles. This process is also known as CO2 snow blasting or dry ice blasting. It is a fast, gentle, and environmentally safe method that can be used to clean sensitive surfaces. The cleaning effect is based on thermal, mechanical, and physical processes, including the thermal expansion differences between the impurity and the surface being cleaned, which help to detach and remove the impurity. CO2 snow cleaning can be used to remove particles of all sizes, organic residues, and reagent grade solvent stains. It is also effective at removing oil and grease impurities due to the dissolving action of carbon dioxide.
CO2 snow blasting machines use compressed air and liquid CO2 to generate small compressed dry ice particles. These particles are then accelerated with the aid of high-performance nozzles and blasted onto the surface to be cleaned. The flow velocity of the CO2 particles depends on the nozzle and setting parameters used, typically ranging from 50 to 300 m/s. Flat nozzles with jet widths of up to 125 mm can be used for cleaning large surface areas, while special round nozzles are available for removing stubborn impurities.
CO2 snow cleaning has been used in various applications, including the cleaning of historical artefacts and art objects, as well as paper soiled by dust. It has also been tested on different materials such as metals, semiconductors, ceramics, glass, and polymers, with a particular focus on reducing surface hydrocarbons.
In addition to its effectiveness in surface cleaning, CO2 snow can also be used to separate carbon dioxide from other gases by freezing it. This process, known as cryogenic carbon capture, involves freezing CO2 at temperatures of -130 degrees Celsius, separating the dry ice from the gas, and then heating it back up. The pressurised CO2 can then be safely stored in underground aquifers or storage facilities for later use.
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Cryogenic carbon capture system
The cryogenic carbon capture system is an innovative technology that offers a unique approach to tackling the pressing issue of carbon emissions and pollution. This system, developed by Brigham Young University (BYU), specifically targets the separation and capture of carbon dioxide from other gases, preventing its release into the atmosphere.
The brain behind this technology is chemical engineering professor Baxter, who has devised a method to freeze carbon dioxide and effectively remove it from emissions. The system utilizes extremely low temperatures of -130 degrees Celsius to condense CO2 out of the air. This process results in the formation of dry ice, which is then separated from the gas mixture. Subsequently, the CO2 is pressurized and converted into a liquid state, allowing for safe storage in underground aquifers or specialized facilities.
One of the standout features of this cryogenic carbon capture system is its exceptional efficiency. It boasts a remarkable ability to capture up to 99% of CO2 from emissions, outperforming conventional methods. Moreover, it achieves this at half the cost of traditional carbon capture processes, making it a cost-effective solution for reducing carbon emissions.
The versatility of the system is another key advantage. It can be applied across various industries, including fossil-fueled power plants, cement, pulp and paper, iron and steel production, and chemical manufacturing. By integrating seamlessly with existing liquefaction, storage, and distribution technologies, the system provides a comprehensive solution for carbon emissions reduction.
Looking ahead, the developers aim to scale up the technology for commercial use. Baxter and his team are working towards advancing their technology from the pilot stage to a full-scale commercial facility within the next few years. This technology offers a promising pathway to balance the continued reliance on fossil fuels with the urgent need to address climate change, providing a cleaner and more sustainable future for all.
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Global temperature rise
The impact of global temperature rise is not limited to rising temperatures but also extends to other consequences. One notable effect is the reduction of snow cover and sea ice in critical regions, which can alter pressure and temperature gradients. This can lead to the weakening or collapse of the polar vortex, resulting in extreme weather events. For example, in January 2014, a displaced polar vortex caused freezing temperatures across large parts of the United States, affecting areas like Lake Michigan and Niagara Falls.
Additionally, the warming climate poses a threat to permafrost regions. Permafrost, or permanently frozen ground, is essential for various ecosystems. As the Earth's climate warms, permafrost thaws, shrinks, or disappears entirely. This has significant implications for the ecosystems that depend on it. For instance, the thawing of permafrost can release mercury, which can then pollute rivers, groundwater, and aquatic life. It can also impact the stability of infrastructure, such as drilling wells, and the growth of plants and forests.
While there have been suggestions that aerosol pollution could have a cooling effect, reducing global temperatures, the underlying equations and data supporting this idea have been flawed. It is important to note that the climate is a complex system, and predicting its behavior is challenging. However, the overwhelming consensus among climatologists is that global temperature rise is a pressing issue that demands urgent attention and action.
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Fossil fuels and carbon emissions
Fossil fuels are a major contributor to climate change, with ninety companies responsible for two-thirds of recorded greenhouse gas emissions worldwide. The burning of fossil fuels releases carbon dioxide (CO2) into the atmosphere, leading to an increase in global temperatures. Since the Industrial Revolution, the average global temperature has risen by approximately 0.85°C (1.5°F), with each decade getting warmer. This temperature rise has caused Arctic ice to melt, permafrost to thaw, and ecosystems on land and in the sea to change.
To combat climate change, there have been calls to freeze fossil fuel extraction and end government subsidies to the fossil fuel industry. By leaving 80% of existing fossil fuel reserves untouched, communities worldwide aim to reduce emissions and build resilience against the impacts of climate change.
While freezing fossil fuel extraction is a proposed solution, it is important to understand that even if carbon emissions were to stop completely, the Earth's temperature would still rise due to committed warming. This phenomenon occurs because the oceans, which absorb a significant amount of heat, have a much larger mass than the air, and therefore take longer to heat up. As the oceans continue to absorb heat, the Earth's temperature will rise, even without any new carbon emissions.
Additionally, the Earth is currently out of thermal equilibrium, with more energy from the sun being trapped by greenhouse gases than is escaping back into space. As a result, the oceans will continue to absorb heat, further contributing to rising temperatures. While emissions continue, the warming effect is more pronounced. However, even after emissions cease, the Earth will take time to reach a new equilibrium, and temperatures will remain steady rather than dropping immediately.
To summarize, freezing fossil fuel extraction is a crucial step in mitigating climate change. However, due to the complexities of the Earth's climate system, stopping carbon emissions alone will not immediately reverse the warming that has already occurred.
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Frequently asked questions
The freezing point of carbon dioxide is -78.5°C.
Yes, the coldest recorded air temperature on Earth has been as low as -92°C.
Yes, chemical engineering professor Mark Baxter has created a cryogenic carbon-capture system that freezes carbon dioxide and prevents it from escaping into the air. The system captures 99% of CO2 from emissions and costs half as much as conventional methods.
The system cools down gases to the point that CO2 condenses out of the air. The frozen CO2, in the form of dry ice, is then separated from the gas, and everything is heated back up. The CO2 is pressurized to become a liquid and can be stored safely in underground aquifers or storage facilities.
The biggest challenge is ensuring global adoption. As Professor Baxter noted, "Any real solution to this problem needs to be a global solution." Currently, there is only one full-scale power plant in the world that implements carbon capture, located in Saskatchewan, Canada.
