Transparent glove boxIt is a closed operation equipment widely used in fields such as chemistry, materials science, and lithium battery research. It is mainly used to control the atmosphere inside the box (such as inert gas environment) to avoid sample contamination by water and oxygen. However, in practical use, water oxygen pollution is still a common problem that may affect the accuracy of experimental results. This article will explore how to effectively avoid water and oxygen pollution inside transparent glove boxes, ensuring the stability and reliability of the experimental environment.
1. Basic structure and working principle of glove box
A transparent glove box typically consists of a main body, a transition chamber, a gas purification system, a pressure control system, and a monitoring system. Its core function is to maintain a low water oxygen environment inside the box (usually requiring H ₂ O<1ppm, O ₂<1ppm). The main working principles include:
-Inert gas circulation: By continuously introducing high-purity inert gas (such as nitrogen or argon) and cooperating with a purification system to remove water and oxygen.
-Sealing control: Ensure the sealing of the box, gloves, and transition chamber to prevent the infiltration of external air.
-Pollutant adsorption: Materials such as molecular sieves and copper catalysts are used to adsorb water molecules and oxygen.
2. The main sources of water and oxygen pollution
To effectively avoid water and oxygen pollution, it is first necessary to understand its sources:
1. Leakage during operation: glove damage, aging sealing ring, incorrect vacuuming of transition chamber, etc.
2. Contaminants carried by samples: Samples, solvents, or tools that have not been sufficiently dried may carry moisture and oxygen.
3. Insufficient gas purity: The inert gas used contains trace amounts of water and oxygen, or the gas purification system fails.
4. Release of box material: Some plastic or rubber components may slowly release adsorbed moisture.
3. Key measures to avoid water and oxygen pollution
(1) Ensure the sealing of the glove box
-Regularly check whether gloves, sealing rings, and valves are intact, and replace them promptly if any damage is found.
-Perform a leak test (such as a pressure holding test) before use to ensure that the enclosure is leak free.
-When using the transition cabin, strictly follow the vacuum inflation cycle to avoid introducing air.
(2) Optimize gas purification system
-Use high-purity inert gas (above 99.999%) and equip it with efficient gas purification columns (such as molecular sieves and copper catalysts).
-Regularly replace or regenerate purification materials to avoid failure after adsorption saturation.
-Monitor the flow and pressure of the gas circulation system to ensure stable operation.
(3) Strictly control the introduction of samples and tools
-The sample needs to be thoroughly dried before entering (such as vacuum oven treatment) and transferred in a sealed container.
-Tools and consumables should be stored in the glove box in advance or entered after degassing through a transition chamber.
-Avoid frequent opening and closing of the transition chamber to reduce the opportunity for external air to enter.
(4) Real time monitoring of water oxygen content
-Install high-precision water oxygen analyzers (such as dew point meters and oxygen sensors) to monitor the indoor environment in real-time.
-Set an alarm threshold and promptly investigate and handle the cause when the water oxygen content exceeds the standard.
(5) Standardized use by operators
-Conduct training before operation to ensure familiarity with the usage process and precautions of the glove box.
-Try to minimize the opening time of the glove box, operate gently to avoid negative pressure and inhaling air.
-Regularly record the status of the container (such as pressure, water oxygen data) for easy traceability of issues.