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Application of molecular sieves in deep dehydration of natural gas

Currently, the main natural gas deep dehydration devices at home and abroad use synthetic zeolite molecular sieves to strongly adsorb water vapor molecules in the gas to achieve deep dehydration.

  Application of molecular sieves in deep dehydration of natural gas

Synthetic zeolite molecular sieve is a kind of aluminosilicate crystal with a strict framework structure. The internal framework formed by the silicon-aluminum tetrahedron has countless micropores connected in three dimensions. It is a strong polar adsorbent with uniform pore size and has a high selective adsorption and separation capabilities. As the silicon-to-aluminum ratio increases, the polarity of the molecular sieve gradually decreases. Therefore, the molecular sieve with a low silicon-to-aluminum ratio has a stronger ability to adsorb moisture and is suitable for deep dehydration of gas.

The main advantages are as follows:

① Molecular sieves can deeply dehydrate gas. Under normal circumstances, its adsorption capacity is higher than other adsorbents, thus reducing the size of the drying tower and saving money.

② Molecular sieves can effectively dry gases at higher temperatures.

③ Molecular sieves can selectively adsorb water to avoid co-adsorption of heavy hydrocarbons and make the adsorbent ineffective.

④ Molecular sieves are not easily damaged by liquid water, while adsorbents such as silica gel are easily brittle when exposed to water.

Application of molecular sieves in deep dehydration of natural gas

As the moisture adsorbed by the molecular sieve in the adsorption tower increases, the adsorption capacity of the molecular sieve to water molecules gradually decreases. When it reaches a certain value, the water molecules in the gas at the outlet of the adsorption tower will exceed the specified value, indicating that the molecular sieve in the tower Adsorption is saturated. At this time, the molecular sieve in the adsorption tower must be regenerated.

The regeneration process is to expel the water molecules adsorbed in the micropores of the molecular sieve and reactivate the molecular sieve. The design of the regeneration process is critical to the continuous operation of the dryer. As a molecular sieve packed tower that absorbs moisture, no matter how much design margin is selected, the molecular sieve will eventually be saturated and lose its ability to absorb moisture. Therefore, choosing a reasonable regeneration process and parameters has become the focus of dryer design. A reasonable regeneration process can use as little consumption as possible (electric heating power, gas loss rate) to achieve the purpose of effective regeneration.

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