Desiccator

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Desiccors are enclosed enclosures containing desiccants used to preserve moisture-sensitive items such as cobalt chloride paper for other uses. A common use for desiccators is to protect chemicals that are hygroscopic or that react with water from moisture.

The contents of the desiccator are exposed to atmospheric moisture whenever the desiccator is opened. It also takes time to achieve low humidity. Therefore they are not suitable for storing chemicals that react quickly or roughly with atmospheric moisture such as alkali metals; glovebox or Schlenk-type equipment may be more suitable for this purpose.

Desiccators are sometimes used to remove traces of water from almost dry samples. Where the desiccator alone is not satisfactory, the sample can be dried at high temperatures using the Abderhalden drying gun.

Video Desiccator

Constituent

The compartment under the desiccator contains silica gel clumps, freshly calcined raw lime, Drierite or (not effective) anhydrous calcium chloride to absorb moisture. Substances that require drying are incorporated into the upper compartment, usually on hollow and perforated ceramic plates. The glass edges of the desiccant lid should be oiled with a thin layer of vacuum oil, petroleum jelly, or other lubricants to ensure an airtight seal.

To prevent damage to the cover desiccator should be carefully slid on and off rather than directly placed to the base.

Maps Desiccator

Operation

In laboratory use, the most common desiccator is circular and made of thick glass. Usually there is a removable platform in which the items to be stored are placed. Dryers, usually an inert solid such as silica gel, fill the space below the platform. Changing the silica color can be used to indicate when to refresh. Gel indications usually change from blue to pink because they absorb moisture but other colors can be used.

A stopcock can be entered to allow the desiccator to be evacuated. Such models are usually known as vacuum desiccators . When the vacuum is applied, it is a common practice to deviate from the vacuum desiccator with masking tape, or to place it behind the screen to minimize damage or injury caused by the explosion. To maintain a good seal, a vacuum lubricant is usually applied to the flanges.

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See also

• Desiccation

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References

Source of the article : Wikipedia