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Application of molecular sieves

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  Molecular sieves are aluminosilicate compounds that have a cubic lattice.The molecular sieve has a uniform micropore structure,and its pore diameter is uniform.These pores can adsorb molecules smaller than its diameter into the interior of the pore cavity,and have preferential adsorption ability for polar molecules and unsaturated molecules,and thus can pole Different degrees of sex,different degrees of saturation,molecular size and molecular weight of the separation of different molecules,that is,with the"sieving"role of molecules,it is called molecular sieve.Because the molecular sieve has the advantages of high adsorption capacity,strong thermal stability and other advantages that are not available in the adsorbent,the molecular sieve has been widely used.
  In the field of biological macromolecules,bio-rad SEC molecular sieve prepacked columns are commonly used.
  American scientists have discovered that by adjusting the temperature,it is possible to accurately control the pore size in a titanosilicate material to produce a precise new molecular sieve.Some crystal materials have a large number of uniform micropores inside,and the size of the molecules smaller than the pores can pass through,while the macromolecules cannot pass through,and thus can separate the different molecules.Such materials are called molecular sieves.
  In fact,in 2001,the scientists reported in the British magazine Nature that they discovered that a substance called titanosilicate ETS-4 could serve as a good molecular sieve.As the temperature rises,the ETS-4 gradually dehydrates,and the pore size decreases.With this method,the micropore size can be finely adjusted in the range of 3 to 4 angstroms(1 angstrom equals one billionth of a billionth of a meter).Scientists say that some common molecules,such as nitrogen,methane,oxygen,argon,and water,are all about 3 to 4 angstroms in size,and they are almost the same size.Molecular sieves made with ETS-4 can effectively separate them.Researchers have tried to use the ETS-4 to reduce the nitrogen content from 18%to less than 5%from nitrogen and methane mixtures,and succeeded in separating argon from oxygen,nitrogen,and oxygen.It is believed that this technology will have important commercial application prospects.

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