Chemical industry has its share in polluting the environment and today it has realized that the time has come to make the industry more and more efficient not only in terms of profit and yield, but more accountable in terms of pollution abatement and eco- friendliness This has led to term GREEN CHEMISTRY Traditionally,organic synthesis is highly logical, but highly inefficient . This situation was allowed to continue mainly because
Fuel cells for cellular phonesOxidation cracking process – formation ethyleneThe synthesis of ibuprofenSafer marine antifouling compound “sea-nine”Technology eliminating CFC
Zeolites are crystalline aluminosilicates with exchangeable cations The cations can be exchanged with protons that make them acidic solids Si:Al ratio can vary in zeolites from 1 to infinity No.of acidic sites decreases with increase in the Si:Al ratio Strength of the acidic sites increases with the Si:Al ratio There are also Lewis acid sites(tri-coordinated Al) They have micro-pores of entry port size varying from about 3 to 12A
Zeolites are formed by oxygen-sharing T(Si or Al) atoms, each T atom linked to four oxygen making tetrahedra These tetrahedra are linked to form rings containing equal no. of oxygen and silicon atoms The rings share common oxygen(or silicon) forming different polyhedra The polyhedra then join by sharing common oxygen(or silicon) forming the three dimensional net work structure giving rise to pores The pores may be all in one direction or many run in several directions
Reductionof atmospheric oxides of nitrogen(NOx) Cutting emission of VOCs Process improvements in CPI.