分子筛是一种人工合成的、具有微孔型立方晶格的硅铝酸盐。依据其晶体内部孔穴的大小而吸附或排斥不同物质的分子，因而被称为“分子筛”。分子直径小于分子筛晶体孔穴直径的物质可以进入分子筛晶体，从而被吸附，否则，被排斥。
      分子筛根据不同物质分子的极性决定优先吸附的次序。按分子的大小和形状不同的选择吸附作用，即只吸附那些小于分子筛孔径的分子。对于小的极性分子和不饱和分子，具有选择吸附性能，极性越大，不饱和度越高，其选择吸附性越强。
      A型分子筛属于分子筛其中的一种，其结构与NaCl的很相似，属于立方晶系。由于4A分子筛的有效孔径为0.4nm,故称为4A分子筛，其空间网络结构由硅氧四面体单元[SiO4]和铝氧四面体[AlO4]单元交错排列而成。
      4A分子筛结合钙镁离子的速度比三聚磷酸钠慢，且与镁离子的结合能力较弱。但4A分子筛可将水溶液中少量有害的重金属离子（如Pb2+、Cd2+、Hg2+）能很容易快速除去，对净化水质有着十分重要的意义。
      对非离子表面活性剂的吸附，4A分子筛是NTA(次氨基三乙酸盐)和碳酸钠的3倍，是三聚磷酸钠（STPP）和硫酸钠的5倍，这个性质对于在附聚成型生产高浓缩洗衣粉中配入更多的表面活性剂，制得洗涤和流动性能好的产品很有意义。通过实验，4A分子筛的液体携带量≥30%，在洗衣粉生产过程中加入4A分子筛，可增加材料流动性，调节粘度，制得产品外观、流动性和抗结块性能力好的产品。
      虽然4A分子筛的分散能力不如STPP，但通过与聚丙烯酸钠复配可以解决其对污垢的分散问题。

Molecular sieve is a synthetic, microporous cubic lattice of silica aluminate. Molecular sieves are known as molecular sieves based on the size of the holes in their crystal and the molecules that adsorb or repel different substances. Molecules with diameters smaller than molecular sieves can be absorbed into molecular sieve crystals, otherwise they are rejected.
Molecular sieve determines the priority of adsorption according to the polarity of different molecules. According to the size and shape of the molecules, the adsorption effect is to adsorb only those molecules that are smaller than the molecular sieve aperture. For small polar molecules and unsaturated molecules, it has the choice of adsorption performance, the greater the polarity, the higher the unsaturation, the stronger the choice of adsorption.
A type molecular sieve is one of the molecular sieves, and its structure is similar to NaCl, and belongs to the cubic crystal system. Because the effective pore diameter of 4A molecular sieve is 0.4nm, it is called 4A molecular sieve, and its spatial network structure is staggered by the silica tetrahedral unit [SiO4] and the aluminum oxygen tetrahedron [AlO4] unit.
The 4A molecular sieve combines calcium and magnesium ions at a rate of slower than tripolyphosphate and is weak in combination with magnesium ions. However, the 4A molecular sieve can easily remove the harmful heavy metal ions (such as Pb2 +, Cd2 +, Hg2 +) in the aqueous solution, which is very important for the purification of water quality.
Adsorption of non-ionic surfactant, 4 a molecular sieve is NTA three amino acetate (time) and 3 times of sodium carbonate, is sodium tripolyphosphate (STPP) and sodium sulfate 5 times, the nature in the agglomeration forming in the production of highly concentrated detergent into more surface active agent, washing and flow performance was good products is very meaningful. Through the experiment, 4 a molecular sieve liquid carrying capacity is 30% or higher, to join the 4 a molecular sieves, in the process of washing powder production material can increase the liquidity, adjust viscosity, made product appearance, liquidity and caking resistance ability good product.
Although the dispersion capacity of the 4A molecular sieve is less than that of STPP, the dispersion of the dirt can be solved by the combination with sodium polyacrylate.
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分子筛理化指标                                                   

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