Molecular Sieves

We are offering molecular sieves. Yuanying 4a molecular sieve is nonpoisonous and tasteless, no irritations to eyes and skin, does not cause allergies. 4a molecular sieve deposition in the soil after washing will not cause pollution, furthermore can improve soil, so it is a natural and environment-friendly product.
4a molecular sieve is a kind of synthetic, with micropore cubic lattice of alkali metal aluminosilicate salt. It also called sodium a molecular sieve, its structure is similar to nacl. Due to its effective pore diameter is 0.4nm, so it is called 4a molecular sieve, its space network structure is staggered by silicon-oxygen tetrahedron (sio4) and aluminium-oxygen tetrahedron (alo4). 4a molecular sieve decides the adsorption order according to the polarity of different molecules, adsorbs only those with a molecular diameter of less than 4a. For small polar molecules and unsaturated molecules, the greater polarity, the higher degree of unsaturation, the stronger of selective absorption.
In the skeleton of 4a molecular sieve each oxygen atom is shared by two adjacent tetrahedrons, these structures formed a large crystal cave, positive ions and water molecules can be exchanged and reversible dehydration in the crystal cave. The ion-exchange of 4a molecular sieves is in crystals which have aluminium ions, each of aluminum ions with a negative charge, which can be combined with cations such as sodium, calcium and magnesium. Calcium ions and magnesium ions can replace sodium ions and enter crystal caves which were occupied by the sodium ions. It shows that sodium ions can be exchanged by ca2+, mg2+ ions in hard water, so 4a molecular sieve can soften water. 4a molecular sieve also can remove a small amount harmful heavy metal ions (such as pb2+, cd2+, hg2+) in water, it is very important for purifying water.