Skip to main content

Zeolites

Zeolites

  • Zeolites are crystalline solid structures made of silicon, aluminium and oxygen that form a framework with cavities and channel inside where cations, water or small molecules may reside.
    Example of zeolites
    Examples of zeolites.
  • They are often also reffered to as molecular sieves.
    Sieve and molecular sieve.
  • Many of them occur naturally as minerals and are extensively mined in many parts of the world finding application in industry and medicine. However, most of zeolites have been made synthetically.
  • Zeolites are of two types
   1) Natural zeolite.
   2) Synthetic zeolite.
  • Natural zeolite: There are about 40 naturally occurring zeolites. Natural zeolite are non porous. For example; Natrolite.
  • Synthetic zeolite: Synthetic (artificial) zeolites (around 150) have been designed for specific purposes. Synthetic zeolite are porous. Mordenite is a synthetic zeolite.
  • Natural zeolites are used as animal feed, odour control, water purification and water treatment.
  • Natural zeolites are also used as oil absorbent and catalyst.
  • Synthetic zeolites are used as catalyst, detergents etc. Next

Comments

Post a Comment

Popular posts from this blog

Polypropylene (PP)

Polypropylene (PP). Polypropylene (PP) is also known as polypropene. Polypropylene is made from the polymerisation of propylene gas in the presence of Zeiglar Natta catalyst or metallocene catalyst. Polypropylene. Thus propene (or propylene) is the monomer of polypropylene. Polypropylene is a highly flammable material. It is sensitive to microbial attacks, such as bacteria and mold. It exhibits excellent resistance to diluted and concentrated acids, alcohols and bases. Polypropylene is used to make lunch boxes, margarine containers, yogurt pots, syrup bottles etc. Disposable syringes is the most common medical application of polypropylene. Polypropylene rope and twine are very strong and moisture resistant very suitable for marine applications. Polypropylene, highly colorfast, is widely used in manufacturing carpets, rugs and mats. Uses of Polypropylene. Questions on polypropylene; Q1) What is polypropylene? Ans) Polypropylene is a polymer of propylen...
Post a Comment
Read more

Determination of molecular weight by osmotic pressure method

Determination of molecular weight by osmotic pressure method. Osmotic pressure method is also called membrane osmometry. This method is widely used to determine the number average molecular weight of polymers. This method is based on the phenomenon of osmosis. If a pure solvent is separated from a solution through a semipermeable membrane, due to concentration (chemical potential) difference between the solvent and solution, the solvent will flow into the solution through semipermeable membrane. The pressure applied on the solution to completely stop the flow of solvent into it through semipermeable membrane is called osmotic pressure. The theory of osmotic pressure also applies to a solution of polymers. Ordinary solution obeys Van't Hoff equation i.e π=cRT/M Where π is osmotic pressure, c  is concentration in mass per unit volume, R is gas constant, T is temperature and M is molar mass. The polymer solution are non ideal. Taking into account their deviation and us...
Post a Comment
Read more

Polylactic acid/PLA.

Polylactic acid/PLA. Polylactic acid is a biodegradable thermoplastic polymer . Polylactic acid is obtained from lactic acid monomer. Polylactic acid. Polylactic acid is stable to UV radiation. Polylactic acid has good resistance to moisture. Polylactic acid has good elasticity. Polylactic acid is an aliphatic polyester . It can be used as a food packaging polymer. Polylactic acid is suitable for textile fibre applications such as shirts, carpets, sportswear etc. Polylactic acid is used in implants and medical devices (screws, sutures etc). Polylactic acid is suitable for use in floor mats. Uses of Polylactic acid. Questions on Polylactic acid/PLA; Q1) What is Polylactic acid? Ans) Polylactic acid is a biodegradable thermoplastic polymer. Q2) What is the monomer of Polylactic acid? Ans) Polylactic acid is obtained from lactic acid monomer. Q3) Write some properties of Polylactic acid? Ans) Some properties of Polylactic acid are given below; ...
Post a Comment
Read more