Activated charcoal is highly porous carbon used in air filters to capture solvent fumes and organic compounds by adsorption of molecules (van der Waals forces). Unlike particle filters, which rely on micro-pores to capture solid contaminants suspended in air, Terra’s coconut-shell based charcoal filters remove a wide range of chemical fumes and odors common to laboratories and manufacturing environments. To understand chemical vapor filtration, let’s first focus on what having a carbon-based filter means.
Did you know...
传统的炭是一种常见的商品,发现in everyday-homes (cooking barbecues, vacuum cleaners, etc.). But did you know your water filter may contain activated carbon? Drinking water is often filtered through activated charcoal to remove certain toxins, and improve the odor and taste.
What does “activated” mean?
There are a couple of methods to making charcoal active. Terra’s charcoal filters undergo a chemical heating process. This results in millions of diminutive pores that increase surface area bonding sites to adsorb molecules— far more efficient than a non-activated charcoal filter. Forming accordion folds with the material further increases the ability of Terra’s charcoal filters to effectively remove fumes and odors. A larger surface with more adsorption sites leads to a longer-lasting filter.
The difference between activated charcoal and particle filters
激活的木炭过滤器在吸附在阴压控制的工作空间中的吸附烟雾非常有效，其中污染物含有至关重要。虽然HEPA和ULPA过滤器捕获大多数空气传播的颗粒，但它们无法从应用任务的化学物质或副产品中取出可能释放到您的托管空间中的气味。某些非危险的化学品可以充当刺激性的人员长时间与它们紧密地工作。如果没有删除这些气味，人员生产力水平降低，安全问题上升。Terra的激活炭过滤器以富含碳氢化合物等常见有机烟雾的捕获效率接近100％，营造出更安全，更舒适的环境。它们可用于化学或导管排气罩，并在风扇/过滤器单元（FFU）中使用时，碳过滤器可以与预过滤器或HEPA或ULPA颗粒过滤器配对。另外，浸渍的木炭过滤器可以用特定化学品优化性能。苛性浸渍碳保护有机和无机酸，卤化物，VOC和硫化合物，而酸浸渍过滤器对胺和乙酸盐的保障。
过滤器是否需要改变？
Just like your at-home water filter, cleanroom activated carbon filters have a service life. Over time, molecules accumulate in the filter, depleting the available chemical bonding sites on the filter. . When this occurs, the filter has reached its Threshold Limit Value (TLV) and needs to be changed. The TLV frequency varies depending on the operating conditions and the type of chemical compounds being filtered.
When will I know it’s saturated?
When particle filters need to be changed, you will notice changes in pressure differential and velocity. For charcoal, there are two effective ways to know when a replacement is needed: 1) the filter is heavier than when it was first installed (so take a baseline weight before you start using it), and 2) you will start to detect odors that have slipped through the filter, telling you that it’s saturated. You can also use chemical detector equipment to test for the presence of specific vapors in the filtered air. By monitoring filter performance closely when the system is placed in operation, you can set a replacement schedule. As long as working conditions are relatively consistent, filter replacement should take place within the same approximate period of time.
When it comes to the safety and comfort of your cleanroom operations, activated charcoal filters provide coverage that HEPA and ULPA filters can’t. Their efficient and effective porous surface adsorbs most airborne chemical fumes and odors—an irritant that, with prolonged exposure, may disturb or even harm personnel. A comfortable and safe working environment will increase efficiency and productivity.
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