How to remove moisture from gas?

You can use a molecular sieve dryer

The water absorption of concentrated sulfuric acid refers to the strong combination of concentrated sulfuric acid molecules with water molecules to form a series of hydrates, such as H2SO4·H2O (SO3·2H2O), H2SO4·2H2O (SO3·3H2O) and H2SO4·4H2O (SO3·5H2O). These hydrates are very stable, so concentrated sulfuric acid is a good desiccant. It can not only absorb moisture in the air, but also capture the crystal water in crystal hydrates. Calculated based on sulfuric acid trihydrate, the ideal water absorption concentration of sulfuric acid should be maintained above 98/(98+54)=65%. When using 98% sulfuric acid to absorb water, the hourly dosage is set to XX * 0.98/(X+700)=0.65 X=1379Kg When using 105% sulfuric acid, it is

If molecular sieve is used to absorb at 200 degrees, the absorption capacity will be very limited. If sulfuric acid is used, the cost will increase and the environment will be seriously polluted. If process conditions permit, it is recommended that you first cool down the gas and then use molecular sieves to absorb it.

Depending on the water content, physical methods such as molecular plugging or chemical methods such as distillation can be considered.

Commonly used liquid water-absorbing agents include calcium chloride aqueous solution, lithium chloride aqueous solution, glycol-alcoholamine, diethylene glycol and triethylene glycol, etc. The characteristics of various water absorbing agents are shown in the table. Characteristics of Several Water Absorbing Agents Advantages and Disadvantages of Water Absorbing Agents Usage Calcium Chloride Aqueous Solution 1. low cost ； 2． Small consumption (0.016-0.06 kg/10,000 m3) ； 3． Can be used in alpine areas ； 1． Emulsify with water ； 2． Produce electrolytic corrosion ； 3． Dew point reduction (11-20℃) ； 4． Precipitation with H2S gradually eliminates the lithium chloride aqueous solution 1. Great water absorption capacity ； 2． Less corrosive ； 3． It has bactericidal power and can disinfect gas treatment ； 4． Not easily decomposed by adding water ； 5. Large dew point drop (22-37℃) 1. higher price ； 2． Industrial products may cause corrosion when they contain impurities. They are suitable for air conditioning and gas dehydration using the glycol-alcohol glue method (monoethanolamine 10-30%, diethylene glycol 60-85%, water 5%) 1. Remove CO2, H2S and water simultaneously ； 2． Glycol can reduce the foaming of alcoholamines ； 3． Purify and dehydrate in one step ； 1． Greater carrying loss than triethylene glycol ； 2． High regeneration temperature and severe H2S corrosion ； 3． Less dew point drop ； Used in some gases that require low dew point ； Diethylene glycol (diethylene glycol) 1. More stable ； 2． Concentrated solutions do not solidify ； 3． Stable in the presence of H2S and CO2 during normal operation ； 4． Large suction capacity ； 5. Small carrying loss ； 6. Maintenance and installation are easier ； 7. Flexible processing capacity ； 1． Carrying loss is greater than triethylene glycol ； 2． The regeneration concentration is 95% ； 3． Large initial investment ； Gradually replaced by triethylene glycol method ； Triethylene glycol (triethylene glycol) 1. Superior to all the benefits of diethylene glycol ； 2． The regeneration concentration is as high as 99% or more ； 3． The dew point drop is higher than the above methods (28-58℃) 1. Defoaming agent needs to be added to avoid foaming in the presence of light oil ； 2． Solvents are not as abundant in the market as diethylene glycol ； 3． Large initial investment ； The widely used triethylene glycol method is a commonly used method.

Molecular sieve dryer, how to use it