Dry ice (also known as CO2 ice) is a solid form of Carbon dioxide (CO2) gas that is widely used in many fields such as food, medicine, industry, etc. However, many people do not know How to store dry ice properly to increase usage time, ensure safety and efficiency. This article Tan Long will guide you in detail on simple and safe methods of preserving dry ice for practical application.
How long can dry ice be stored?
The sublimation temperature of dry ice at normal pressure is -78.5°C. Therefore, CO2 ice sublimates very quickly into gas even when stored carefully. At normal room temperature, dry ice will evaporate from 2.5% to 5% of mass per hour.
However, if dry ice is kept in colder conditions such as a closed freezer at -15°C, dry ice evaporates less, losing only 0.5 to 1% of mass per hour. Therefore, if stored properly at -15°C, dry ice will last for about 3-5 days without too much loss.
To increase the storage time of dry ice, you need to pay attention to some key factors such as: highly insulated containers, low ambient temperature, and minimizing contact with air and water.
How to preserve dry ice for a long time using an insulated box
The most common and simple method for long-term storage of dry ice is to use a thick, insulated container made of foam or plastic. These containers retain cold well, which helps to limit the sublimation of the dry ice. Here are some tips for increasing the shelf life of CO2 ice in an insulated container.
Use insulated containers to preserve CO2 ice
For effective preservation, you should choose a box with a size suitable for the purpose, not too large to avoid wasting space and losing cold quickly. The wall of the box should be lined with foam or a material with high insulation capacity to limit the sublimation of dry ice.
Ideally, CO2 ice should only take up about 1/2 to 2/3 of the capacity of the insulated container. Any less will quickly lose the cold, and any more will make the container heavy and difficult to move.
Crumple and add more paper to the dry ice storage bin
To minimize unnecessary space in the dry ice container, you can crumple up pieces of paper and stuff them around it. This will help the container retain cold better, limiting the heat from seeping in. In addition, this layer of paper also has the effect of absorbing surrounding moisture, helping the dry ice to melt less.
Avoid opening the lid of the dry ice storage container many times.
One of the main reasons why dry ice melts quickly is because it is exposed to warm air continuously. Therefore, you should limit opening and closing the lid of the box to avoid letting the cold air inside escape. Every time you need to take out CO2 ice to use, calculate the amount needed, take it quickly and close the lid immediately.
The cooler must be placed in a low temperature location.
You should place the dry ice container in a cool, low-temperature area that is not directly exposed to sunlight or other heat sources. The lower the ambient temperature, the slower the sublimation of CO2 ice.
If possible, it is best to place the box in a cold space such as an air-conditioned room, warehouse or cold cellar. You can add a layer of heat-resistant tarpaulin around the box to increase the ability to retain cold.
How to properly store dry ice in the refrigerator
If your family has a refrigerator or industrial freezer, storing dry ice in it is extremely reasonable. The CO2 gas released when dry ice melts will not affect the taste and safety of the food stored in the refrigerator.
However, you need to pay attention to wrap the CO2 ice block tightly in a zip bag or plastic box before putting it in the refrigerator. At the same time, the rubber gasket of the refrigerator door needs to be tight to prevent cold air from leaking into the air. Under the influence of temperatures below 0°C in the refrigerator, the sublimation rate of dry ice will be significantly lower than in normal environments.
How to properly store dry ice in cold storage
For businesses using huge amounts of CO2, investing in a system cold storage is necessary to increase storage time. To minimize the sublimation of dry ice, the ideal temperature required in cold storage is from -10°C to -15°C.
You should arrange the CO2 ice blocks neatly on pallets and place them on specialized shelves. The cold storage door needs to be fitted with a curtain to limit the amount of cold air escaping and moisture entering every time the door is opened. With the optimal storage conditions as above, you can completely preserve dry ice for 3-5 days without worrying about much loss.
Some notes when using and storing dry ice
In addition to applying the above instructions for storing dry ice, users need to be extremely careful and pay attention to ensure safety when handling them. Below are some important notes when using and storing dry ice that you need to remember.
Only buy CO2 ice before use date.
Many people have the habit of storing dry ice long before they plan to use it. This is completely unnecessary and even wasteful because the ice will be depleted very quickly. It is best to order CO2 ice on the day of use or at most 1 day before.
Wear protective gloves to insulate and protect your arms.
With an extremely low temperature of about -78°C, dry ice can cause severe frostbite to the skin upon direct contact. Therefore, users should always wear specialized insulated gloves when handling or using CO2 ice.
You should also avoid wearing short sleeves and exposing your arms when in close contact with dry ice. In case of frostbite, immediately rinse the affected area under cold running water for 15-20 minutes.
Be safe and avoid frostbite
When storing dry ice, you need to choose a well-ventilated, airy location, avoiding narrow corners. Absolutely do not store ice in sealed containers, closed boxes or closed cars. CO2 gas released when ice sublimates can cause suffocation if at high concentrations in a tight, closed space, posing a serious risk to life.
Other notes
- Never taste, eat or drink water from melted dry ice as it can cause severe frostbite to the mouth and esophagus.
- Do not rub, puncture or hit the CO2 blocks with a knife or sharp object.
- When moving dry ice, you should use specialized shovels and iron tongs to protect your hands.
- Be careful when adding dry ice to drinks because the cold air can cause the water to boil and splash.
- CO2 ice should only be used for industrial purposes, medical and food preservation, not for recreational purposes.
Conclude
Above are detailed instructions on how to preserve dry ice simply, safely and effectively that you can apply. However, if you want to store CO2 ice in large quantities for a long time, investing in a specialized cold storage system is extremely necessary.
If you are looking for a reputable, professional unit to consult on the design and construction of cold storage for dry ice, please contact Tan Long immediately. We are one of the leading companies in the field of providing services. cold storage installation full package, with experienced team and the most modern equipment.
With prestige and quality confirmed through thousands of real projects, Tan Long commits to bring the best cold storage products with competitive prices in the market. Quickly contact us by phone for the most detailed free consultation and quotation.
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Frequently asked questions about handling dry ice
What is dry ice and how should it be stored?
Dry ice is solid CO2. It must be kept in an insulated container that is NOT airtight, because dry ice sublimes into gas continuously and the pressure building up in a sealed container can cause an explosion.
Why must dry ice never be kept in a sealed fridge?
Because the CO2 given off cannot escape and pressure builds up. The extremely low temperature of dry ice can also damage the appliance's temperature controller.
What safety precautions does handling dry ice require?
Always wear insulated gloves — direct contact causes cold burns. Use it only in a well-ventilated space, because CO2 is heavier than air and accumulates in enclosed spaces, causing asphyxiation.
What is dry ice used for?
Shipping frozen goods, biological samples and pharmaceuticals where there is no power supply; creating fog effects at events; and rapid chilling in certain processing operations.
What are the drawbacks of shipping goods with dry ice?
Dry ice sublimes away, so it only holds temperature for a limited time, the cost per shipment is high, and there are safety restrictions on air freight.
When should you use a cold store instead of dry ice?
When you need storage regularly or over the long term. Dry ice suits transport and short-term situations; for continuous storage, a cold store is far more cost-effective.
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With over 18 years of practical experience in directing, consulting, designing, and constructing heavy industrial refrigeration systems, ASRS automated warehouses, and IQF freezing systems across more than 29 major national projects.
