16/09/2013
Sodium Cation Exchanger
In this application, ion-exchange resins are used to replace the magnesium and calcium ions found in hard water with sodium ions. When the resin is fresh, it contains sodium ions at its active sites. When in contact with a solution containing magnesium and calcium ions (but a low concentration of sodium ions), the magnesium and calcium ions preferentially migrate out of solution to the active sites on the resin, being replaced in solution by sodium ions. This process reaches equilibrium with a much lower concentration of magnesium and calcium ions in solution than was started with.
Regeneration of Resin:
The resin can be recharged by washing it with a solution containing a high concentration of sodium ions (e.g. it has large amounts of common salt (NaCl) dissolved in it). The calcium and magnesium ions migrate off the resin, being replaced by sodium ions from the solution until a new equilibrium is reached. The salt is used to recharge an ion-exchange resin which itself is used to soften the water.
15/08/2013
Happy independence day everyone.....
05/05/2013
“A boy and his Atom” is the world’s smallest movie and was made by moving actual atoms, frame by frame. Its creators used a 2-ton scanning-tunnelling microscope that operates at minus 258 degrees Celsius to shoot the entire film.
Watch the movie: http://bit.ly/YcK5OS
Read more: http://dthin.gs/102kwwC
27/02/2013
http://www.coolage.in/2013/02/27/golden-jubilee-celebrations-chemical-dept-iit-roorkee/
Golden Jubilee Celebrations @Chemical Dept, IIT Roorkee
The Department of Chemical Engineering was established in IIT Roorkee (then University Of Roorkee) in 1963 with an undergraduate programme. It has been
24/02/2013
Dear Prospective Alumns of Chemical Engineering @ IIT Roorkee, you may be aware that we are celebrating alumni meet (Feb 24-25, 2014) as a part of the golden jubilee celebration (1963-2013) of our department... Our alumns will be delighted to interact with their future family members.... You may make it convenient to interact with them tomorrow (Feb 25, 2013) at 10:00 am...