Dehydration of Water-Pyridine Mixtures by Pervaporation

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Sonali Purohit
Gateways

Dehydration of Water-Pyridine Mixtures by Pervaporation
To start, a mixture is a physical combination of substances(ie: oil and water.) Therefore, mixtures can be separated into their individual components using a variety of different methods such as centrifugation, chromatography and many more. The way one chooses between which method of separation depends on the properties one wishes to focus on. For example, if one wants to separate the components based on density, then centrifugation is the obvious choice. Whereas if one wants to separate based upon size, mechanical separation (physical separation by the use of tools or hands), is the best option for such a task.

Pyridine is a clear liquid, similar to water, however, it has a foul, putrid smell. It has a variety of uses such as paints, adhesives, medicines and future uses to come. Pervaporation is a separation process in which a substance permeates through a membrane and then evaporates. So simply put, it is a way to the components of a mixture penetrates through the membrane(something that protects the contents of an organism) and then evaporates. For solvent dehydration, pervaporation has become a standard method because (1) the selectivity for water is very high with state-of-the-art membranes and (2) the concentration range for dehydration, in which a relatively small amount of water has to be removed, is ideal for pervaporation.

A liquidized pyridine solution was dehydrated by using modified polyacrylonitrile(a hard, rigid thermoplastic material that is resistant to most solvents and chemicals, slow to burn, and of low permeability to gases)membranes to form complexes with the solute in the feed solution. The pervaporation separation of a water-pyridine mixture using poly(acrylonitrile-co-acrylic acid, meaning) membranes exhibited a separation factor depending on the operating temperature and the concentration of the feed mixture. The penetration mechanism through the membrane is explained on the basis of the molecular interaction between the invading contents and the membrane.

With some slight tweaks and changes to maybe how the process is being performed and the machinery used, the process of pervaporation could be used to efficiently purify water as it comes to the tap or faucet. It could also be used not exclusively for water, but for other mixtures as well such as sand and water. It could also make separating mixtures that may not completely but almost dissolve much easier to isolate certain components.

-https://www.britannica.com/science/polyacrylonitrile




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