What desiccant is in adsorption dryer？In here, we will introduce the desiccant in adsorption dryer.

Zibo Xiangrun Environment Engineering Co.,Ltd and Shandong Bairui Chemical Technology Co.,Ltd will explain” What desiccant is in adsorption dryer？”

1. Silica gel

silica alumina gel

Silica gel is a commonly used dehydration adsorbent.The natural porous SiO 2 is often called diatomaceous earth, which is called synthetic silica gel.
Silica gel has a strong adsorption of water. It is good in dehydration and drying, gas separation, with high chemical stability, good heat resistance, Moisture content of high air adsorption drying.

Silica gel performance is hydrophilic, its pore size distribution is single and narrow, the amount of water adsorption.

The disadvantage of adsorbent

1, In the adsorption of water, silica gel will release a lot of heat, so that the temperature of silica gel rose to 100 ℃ or more, then silica gel in the joint water will evaporate due to high temperature; so although the silica gel adsorption 50% (the amount of static adsorption), but in actual use in order to avoid excessive heat generated by adsorption, silica gel adsorption of water should not exceed their own weight of 6% to 8% (dynamic adsorption capacity).

2, the adsorption of water vapor in the capillary condensed into liquid water or encountered liquid water droplets, the particles will rupture, especially in the presence of pressure is more obvious. In this situation, in the compressed air adsorption dryer due to the cyclical alternating pressure Of the impact, so the silica gel is not common in the application.

2. Activated alumina.

Activated alumina desiccant

Activated alumina is usually the aluminum water dehydration. For the compressed air adsorption drying, it is γ form of activated alumina, the activation temperature is below 600 ℃. Activated alumina has a strong affinity for water, under certain operating conditions, its drying effect can reach the dew point below -40 ℃, the regeneration temperature is lower than the molecular sieve. Activated alumina has a high surface hardness and compressive strength, under the action of static pressure is not easy to break, under the action of alternating pressure is not easy to wear off. Because of its large adsorption capacity, in the high humidity gas drying process, the adsorption regeneration cycle can be longer than other adsorbents, to avoid the frequent switching of the regeneration operation.

3. Molecular sieve

molecular sieve

Molecular sieves are a adsorbents with uniform pore size and selective adsorption of diameters less than their pore diameters.

The zeolite molecular sieve is a synthetic zeolite type aluminosilicate polyol crystal. Its thermal stability and chemical stability is relatively high, but also with screening performance, ion exchange performance, select the singularity and good adsorption and so on.

From the adsorption of substances, its characteristics are:
1, The microporous channel diameter of molecular sieve surface are consistent, and it can only absorb the diameter of the channel diameter smaller than the gas molecules;
2, molecular sieve channel slit, and the opposite surface of the hole wall will produce force field superposition phenomenon, so that the adsorption potential has improved significantly, this feature leads to low concentration of adsorbate or high temperature conditions, the molecular sieve is still quite large Of the adsorption capacity;
3, zeolite molecular sieve is a polar adsorbent, the polar molecules, especially for water has a great affinity, but also choose to adsorb unsaturated organic compounds;
4, the adsorbent molecular sieve drying pressure dew point up to -70 ℃ below.

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