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Molecular sieves, 4 A, beads, 4-8 mesh

SKU:
208590-500G
  • $93.40
  • Description

    Molecular sieves, 4 Å, beads, 4-8 mesh

    PROPERTIES

    Quality Level

    100

    form

    beads

    particle size

    4-8 mesh

    pore size

    4 Å

    General description

    Choosing a Molecular Sieve:
    1. The preferential adsorption of one molecule over another depends upon pore diameter and mesh size.
    2. The dynamic capacity of the silica gel for adsorbing a particular compound is governed by the internal surface area; the greater the surface area, the greater the dynamic capacity.
    3. Rate of adsorption and sharpness of resolution are dependent chiefly on particle size and column packing; a fine particle size gives optimum sharpness of resolution.
    4. Liquids are most readily adsorbed from solvents in which they are least soluble; a good solvent makes a good desorbing agent.
    5. Highly polar liquids are readily adsorbed. Compounds having hydroxyl groups, or containing oxygen are strongly adsorbed.
    6. For similar compounds, the higher the molecular weight the higher the selectivity.
    7. For hydrocarbons of similar molecular weight, adsorptivity increases with the number of double bonds.
    Regeneration or Activation:
    A saturated molecular sieve can be restored to its original capacity by regeneration, the principle of which involves changing the conditions surrounding the adsorbent to correspond to a very low equilibrium capacity. In general, the greater the difference between the equilibrium capacities of adsorption and regeneration, the more rapid and complete the regeneration.
    The sieve may be regenerated in one of four ways:
    1. Thermal reactivation –The maximum regeneration temperature for Silica is 300°C.
    2. Pressure reactivation
    3. Passing an appropriate fluid through the gel bed at normal temperature and pressure.
    4. Displacement of adsorbates by passing a high concentration of molecules in a fluid through the bed.

    Application

    The product (Molecular sieves, 4 Å) has been used for the drying of HPLC grade acetonitrile.

    Packaging

    5 kg in fiber drum
    500 g in poly bottle
    1 kg in poly bottle

    SAFETY INFORMATION

    Signal Word

    Warning

    Hazard Statements

    H315 - H319 - H335

    Precautionary Statements

    P261 - P305 + P351 + P338

    Hazard Classifications

    Eye Irrit. 2 - Skin Irrit. 2 - STOT SE 3

    Target Organs

    Respiratory system

    Storage Class Code

    13 - Non Combustible Solids

    WGK

    WGK 3

    Flash Point(F)

    Not applicable

    Flash Point(C)

    Not applicable