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ADVANCES IN ION EXCHANGE TECHNOLOGY
An ion exchange resin is an insoluble matrix normally in the form of small beads, approximately 1 to 2 mm diameter, fabricated from an organic polymer substrate. The ‘trapping’ of ions takes place with a simultaneous release of other ions; thus the process is called ion exchange.
Most typical ion exchange resins are based on cross linked polystyrene.
There are the following four general types of ion exchange resin which differ in their functional groups:
• Strongly acidic- sulphonic acid groups;
• Weakly acidic-carboxylic acid groups;
• Strongly basic-trimethylammonium groups;
• Weakly basic-amino groups.
`Strong’ resins have a greater affinity for al ionized constituents in water and are capable of removing even weakly ionized constituents such as acetates and silica.
`Weak’ resins are ineffective at removing weakly ionized constituents. However, their exchange capacities are two or three times that of strong resins and can be regenerated more efficiently.
Ion exchange resins have a higher affinity for polyvalent ions. So divalent ions are removed first as water passes through a resin bed. Monovalent ions such as sodium can be displaced by divalent ions in the exhaustion cycle and will leak into the product stream first.
While the manufacturing processes have been developed to reduce costs, improve the consistency of the resin quality etc. the resins appear to have only subtly changed in recent years.
Some collaborative developments between equipment manufacturers and resin manufacturers have taken place to develop `customised’ resins which may be more suitable for specific applications, for example .doping. the resin. There have also been developments in ion exchange resins used in the manufacturing of pharmaceuticals, e.g. catalyzing certain reactions, isolating and purifying pharmaceutical active ingredients. Some ion exchange resins are used as active ingredients and some are also used as excipients in pharmaceutical formulations
This article further discusses the following details :
• Pretreatment systems
• Macroreticular anion exchange resin
• Hot water sanitisation
• Purification systems
• Scion short cycle ion exchange
• Recent developments
• Continuous Electrodeionisation technologies (CEDI)
• Skid mounted systems
TATA GROUP’S TITANIUM DIOXIDE PROJECT
IN TAMIL NADU, INDIA
Tata Group have announced several times in the past about setting up of Titanium dioxide (TiO2) project Tamil Nadu, India. Several schedules were announced. It now appears that the time has come for this TiO2 project.
Even at present, one is not sure as to whether the project would ultimately materialise, since the political parties and local agitators have started criticising the project and are making it look as if it is more a subject of politics than industries and development.
It is unfortunate that the well intentioned titanium dioxide scheme of Tata Group is being subjected to such campaign and the Tata Group management are being forced to spend considerable time and energy in providing explanation on matters which are well known. In the process, Tata Group is losing valuable time and opportunities in implementing the project.
Titanium dioxide is a versatile pigment produced from ilmenite ore. India has special advantages with regard to titanium dioxide since India possesses more than 150 milion metric tonnes of ilmenite deposits, which are estimated to be around 14% of the total world reserves.
Titanium dioxide content of the ilmenite available in India is highest compared to other ilmenite deposits in the world. Though India possesses 14% of the world reserves of ilmenite, Indian production of titanium dioxide is around 1% of the global production.
The international production of titanium dioxide pigment is around 4.5 milion metric tonnes per annum and Indian production is around 55000 metric tonnes per annum. One can clearly see that India has been losing glorious opportunities in the field of titanium dioxide and Tata Group is now trying to exploit the situation to India’s advantage.
Tata Group itself has already delayed the project considerably, as it was not able to make up it’s mind in the past amongst the various alternate project opportunities available to it and has been moving slowly and carefully in the matter. Some how, it has now made up its mind. This decision of Tata Group should be encouraged.
Tata Group has provided explanations to allay the apprehension of the political parties and agitators over its proposed Rs.25000 million titanium dioxide project in Tamil Nadu.
The apprehension about the project relates to possible demolition of dwelling units and large scale eviction of people, destruction of agriculture land and means of livelihood, over exploitation of water resources, possibility of radiation risks and job for the local people.
Tata Group says that about 10,000 acres of land will be acquired for the project at the market rates. Government records say that less than 5% of the total project area is wetland.The project area will not disturb any existing dwellings, religious places and public roads. The residents in the area will continue to live without any disturbance due to this project.
Tata Group further says that the company will develop the mined out land and improve the vegetation cover of the area.The project activity will make the entire area greener.
About the exploitation of ground or river water, the company said that the mineral occur only in the top layer , whereas, the water table is much below the sand. Therefore ground water profile will not be affected.
Tata Group argues that since the project site is far away from the sea, there will not be any seawater incursion.The sand contains only 10% minerals, the balance 90% will be put back on the mined out area, after extraction of minerals.
About the elimination of radiation hazard, it says that the mineral sand contains monazite, a radioactive mineral.The monazite tailings will be handled safely and disposed of strictly as per the guidelines of department of atomic energy and thus there will not
be any health hazard due to radiation.
Titanium dioxide project of Tata Group offers tremendous opportunities for India and the region. Tata Group getting into the field would ensure that adequate funds would be provided not only for the setting up the project at present but also for the future development.
The politicians and agitators should view the titanium dioxide project in proper perspectives instead of taking the issue to the streets. Industrialisation is a national necessity and some times it can even be a compromise decision. Matured outlook is necessary so that neither the commonman would be affected nor the opportunities for growth of India would be lost. OTHER ARTICLES
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