Function of Activated Alumina In The Process Of Water/Gas Dehydration and Filtration Process

Process of Water Hydration and Filtration:

Activated alumina is regarded essential as an effective desiccant and adsorbent that is utilized in number of applications to remove the moisture and in purifying products. Its application in the process of air drying is magnificent due to the highly porous nature of aluminum oxide which works efficiently in wide range of conditions. Water dehydration with activated alumina desiccant is a natural gas treating technology, the end result of which is similar to the gas processing technologies including glycol dehydration or gas dehydration, excepting that the desiccant dehydration does not make use of amines. Activated alumina desiccant dehydration utilizes adsorption technology for the purpose of drying natural gas.

Activated Alumina for Water Dehydration

Preferred size of Activated Alumina Balls for Water Dehydration:

Activate alumina desiccant dehydration by using adsorption normally consists of two or more adsorption towers. These adsorption towers tend to alternate between cycles where in the function of one tower is to remove water or moisture actively from the gas stream, when the other adsorption tower is being re-generated. The adsorption towers are filled with desiccant, capable of adsorbing a limited quantity of water and thus necessitate re-generation, normally by heat. The standard activate alumina desiccant includes granular silica gel material or activated alumina. The activated alumina bead size of 1/8”, which is 2 to 5 mm is the very frequently used size in the regenerative dryers.

Natural Gas Dehydration Process:

In the process of desiccant dehydration, wet natural gas tends to enter the adsorption tower from top and it flows down via the desiccant material, reaching the bottom of adsorption tower. When the natural gas passes through the adsorbent, water gets separated from natural gas that is adsorbed on the desiccant surface particles. By the time when natural gas reach down to the bottom of adsorption tower, about 98% of the water gets adsorbed onto desiccant material, leaving behind the dry gas to way out the bottom of adsorption tower. Once the desiccant present in the active adsorption towers finished adsorbing all the moisture/water it can and attains capacity, the active adsorption tower gets shut down and adjacent adsorption tower is then activated. In the meantime, adsorption tower which has been shut down gets re-generated and the moisture/water that was adsorbed by desiccant gets heated to vaporize the water molecules, to recharge the desiccant and making it suitable for use, once the adjacent adsorption tower completed its cycle.

 Why Activated Alumina is More Preferable Adsorbent Over the Molecular Sieve:

Activated alumina is widely preferred in the process of water filtration than molecular sieve. It is because; it plays a vital role in reducing the level of fluoride in water. Through this process, activated alumina leaves sufficient fluoride in water so that people can receive its prospective health benefits, while at the same time it ensure that the health affecting range of fluoride do not stay in the water.


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