Basic knowledge of medicinal desiccants:
What is a desiccant, and what is its principle of hygroscopicity?
A desiccant is a water-removing agent that absorbs moisture from the atmosphere. Its drying principle is to physically adsorb water molecules in its own structure or chemically absorb water molecules and change its chemical structure to become another kind. substance.
What are the main types of desiccant?
There are currently three typical desiccant products in the desiccant industry:
Silica gel desiccant - the main component is silica, which is purified from natural minerals into pellets or beads. As a desiccant, its microporous structure (average 2A.) has a good affinity for water molecules. The suitable moisture absorption environment of silica gel is room temperature (20~32) and high humidity (60~90%), which can reduce the relative humidity of the environment to about 40%.
Clay desiccant (montmorillonite)---The appearance is gray ball, and zui is suitable for moisture absorption in an environment below 50 °C. When the temperature is higher than 50 ° C, the degree of "water release" of the clay is greater than the degree of "water absorption". But the advantage of clay is that it is cheap.
Molecular sieve desiccant - it is a desiccant product that is synthetic and has strong adsorption to water molecules. The pore size of the molecular sieve can be controlled by the difference in processing technology, and it can adsorb other gases in addition to adsorbing moisture. At high temperatures above 230 ° C, water molecules are well accommodated. Advantages: strong adaptability. Disadvantages: low moisture absorption rate, poor environmental protection (non-degradable).
How to determine the amount of desiccant?
The amount of desiccant depends on various factors: the size of the drying space, the performance of the packaging material, the storage environment of the packaged article, the atmospheric conditions at the time of sealing, the shelf life of the packaged article, the degree of sealing of the package, and the like. When we design the desiccant dosage for our customers, we need to know the above before we can make a good reply.
What is saturation and what is balanced capacity?
Although they are two concepts, for desiccants, in practical terms, they are no longer hygroscopic.
Saturation means that the desiccant has been saturated, and even if there is more water, it cannot be adsorbed.
Balanced capacity means that the desiccant absorbs enough moisture from the air, so that the atmosphere's ability to contain water vapor exceeds the ability of the desiccant to adsorb water. At this point, adding more desiccant will not reduce the relative humidity of the environment.
What does a unit desiccant mean?
Desiccant adsorption unit commonly used abroad. According to the adsorption capacity of the desiccant:
A "unit" desiccant can absorb 3.00g of water and a "unit" of desiccant at a equilibrium temperature of 25 ° C (RH = 40%) at 25 ° C under equilibrium temperature (RH = 20%). Under, can absorb 6.00g water gas. Specifically, a "unit" montmorillonite desiccant is equivalent to 33 grams, a "unit" silica gel desiccant and molecular sieve equivalent to 28 grams, a "unit" fiber desiccant equivalent 18 grams.
How to choose a desiccant?
Medicine and health products, biological reagents, desiccant for the food industry. Special desiccant features: high hygiene requirements (industry license), packaging materials passed the US FDA demonstration. The product is small, efficient, refined and environmentally friendly, with good compatibility and chemical stability.
According to the application environment, there are generally three cases: (MD type moisture absorption rate is 50%, F type moisture absorption rate is 100%)
(1) Use in a small environment: The desiccant is placed directly in a bottle, can or other closed pouch to keep the contents in a small environment dry.
(2) Use in medium environment: The desiccant is used directly in the packaged carton (or drum, bag) to avoid moisture in the package.
(3) Use in a large environment: The desiccant is directly placed in a similar warehouse or container to achieve the purpose of controlling the humidity of the large environment.
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Food additives
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