What is a rectified spirit?
Rectified spirit is a mixture of ethanol and water that is formed by the repetitive distillation process. It contains 95% ethanol and 5% water. Rectified spirit can also be found to be a highly concentrated form of ethanol. It is also otherwise called as rectified alcohol or neutral spirits.
How to convert rectified spirits to ethanol?
There are various processes used across the world to convert rectified spirits to ethanol. Generation of absolute alcohol involves employing the separation technique by using molecular sieves. By adding molecular sieves into the mixture of rectified spirit, this separation of water is easily possible.
The usual procedure is to add 3A type molecular sieves into a mixture for 12 hours.
Molecular sieve is an excellent desiccant that is used in the major industrial application for the moisture removal process. Being crystalline metal aluminosilicates, molecular sieves have a 3D interconnecting network that adsorbs water molecules into its cavities. These silicate compounds contain small pores of uniform sizes that traps vapour and other gas molecules easily. Based on the pore size, there are various types of molecular sieves such as 3A, 4A, 5A and 13A.
Molecular sieve for ethanol drying holds to be its popular application. Ethanol dehydration process utilizes the adsorption capabilities of the molecular sieves. Molecular sieve dehydration process works on the principle of pressure swing adsorption process.
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