bar molecular sieve

A synthetic hydrated aluminosilicate (zeolite) or natural zeolite with molecular screening properties. Its chemical formula is (M ′ 2M) O · Al2O3 · xSiO2 · yH2O, where M ′ and M are monovalent and divalent cations such as K+, Na+, Ca2+, Ba2+, etc. It has many uniformly sized pores and neatly arranged pores in its structure, and molecular sieves with different pore sizes separate molecules of different sizes and shapes. According to the different molecular ratios of SiO2 and Al2O3, molecular sieves with different pore sizes are obtained. Its models include: 3A (potassium type A), 4A (sodium type A), 5A (calcium type A), 10Z (calcium type Z), 13Z (sodium type Z), Y (sodium type Y), sodium zeolite type, etc. It has high adsorption capacity, strong selectivity, and high temperature resistance. Widely used in organic and petrochemical industries, it is also an excellent adsorbent for gas dehydration. It is also increasingly valued in exhaust gas purification

Classification of molecular sieves

3A molecular sieve, 4A molecular sieve, 5A molecular sieve, 13X molecular sieve

Product Introduction

molecular sieves are commonly used adsorbent and catalytic materials in industry. Currently, there are multiple suppliers on the market offering different types of products, such as 3A, 4A, 5A, and other specifications, which are widely used in glass, chemical, and other fields. This material appears as beige or white spherical particles, with tiny pores distributed throughout its interior, capable of selectively adsorbing molecules of specific sizes like a sieve. ‌‌In the field of industrial separation and purification, molecular sieves have become indispensable materials due to their unique “sieving” ability. Although 3A, 4A, 5A, and 13X belong to the zeolite family, they each have their own characteristics in pore size, adsorption properties, and application scenarios, like precision sieves with different functions, serving different industrial needs.

  1. The core characteristics of molecular sieves stem from the uniform pore openings within their crystal structure, and the pore size directly determines their application range.
  2. The pore size of 3A molecular sieve is about 3 Å, which is precisely controlled by potassium ion exchange to adsorb water molecules (with a diameter of about 2.8 Å). It can effectively block larger molecules from entering.
  3. The pore size of 4A molecular sieve is about 4 Å, which is a basic sodium A-type molecular sieve capable of adsorbing small molecules such as water, carbon dioxide (3.3 Å), and sulfur dioxide.
  4. The 5A molecular sieve has a pore size of approximately 5 Å and is prepared by calcium ion exchange. This pore size allows normal alkanes to enter while blocking branched isoparaffins.
  5. The 13X molecular sieve has a pore size of approximately 10 Å and belongs to the sodium X type. It is the largest pore size among these four types and can adsorb almost all molecules with a diameter less than 10 Å.

  1. Based on the difference in pore size, these four types of molecular sieves exhibit completely different adsorption characteristics.
  2. 3A molecular sieve is known for its extreme selectivity, specifically adsorbing water molecules without adsorbing other medium molecules, avoiding the loss of useful components, and is particularly suitable for situations that require deep dehydration and protection of valuable media.
  3. 4A molecular sieve is a universal desiccant that can synergistically adsorb acidic gases such as carbon dioxide and hydrogen sulfide while maintaining strong water absorption capacity, and has a wide range of applications.
  4. 5A molecular sieve has unique shape selectivity, which can accurately “identify” and adsorb straight chain alkanes, eliminating branched isomers. This characteristic is crucial in the petrochemical industry.
  5. 13X molecular sieve has the strongest adsorption capacity and widest adsorption range, and can efficiently remove water, carbon dioxide, hydrogen sulfide, and larger sulfide molecules at the same time, making it a “broad-spectrum purification expert”.

  1. 3A molecular sieve is mainly used for deep dehydration of fluids such as ethanol and ethylene in the chemical industry; Hollow glass interlayer desiccant in the building materials industry; Drying of refrigerant piping systems in the refrigeration industry; And moisture-proof packaging of electronic components.
  2. 4A molecular sieve is commonly used for dehydration treatment of industrial gases such as natural gas and air; As a phosphate free detergent additive in daily chemical industry; And universal desiccants for refrigeration systems.
  3. The main uses of 5A molecular sieve include: molecular sieve dewaxing process in petroleum refining, improving oil quality; Purification unit in pressure swing adsorption hydrogen production process; And the separation of n-alkanes/isoparaffins.
  4. 13X molecular sieve is widely used for deep purification of raw air at the front end of air separation units due to its comprehensive purification ability; Natural gas desulfurization treatment meets pipeline transportation standards; And the purification guarantee of high-purity gases required by the pharmaceutical and food industries.

  1. Requirements for filling environment:
    The operation of filling desiccants should be carried out in a dry and dust-free room to ensure that the molecular sieve is not contaminated or affected by moisture.
  2. Avoid prolonged exposure:
    After opening the packaging of the desiccant, it is strictly prohibited to expose it to the air for a long time. The process from filling to gluing should be completed continuously in the shortest possible time to prevent the molecular sieve from absorbing moisture and becoming ineffective.
  3. Handling of packaging damage:
    If the packaging of the molecular sieve is damaged, it must be tested and approved before use. This is to ensure that the performance of the molecular sieve is not affected and to avoid product failure caused by the use of unqualified desiccants.
  4. Sealing inspection:
    There should be no air leakage around the sealed insulated glass. Leakage can cause the molecular sieve to lose its protective function, so the sealing should be carefully checked.
  5. Avoid direct sunlight exposure:
    After gluing the laminated insulating glass, it is strictly prohibited to expose it to direct sunlight. High temperature and direct sunlight may cause the sealant to age, affecting the sealing effect and thereby reducing the drying performance of the molecular sieve. ‌‌

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