With more than 65 years of experience developing desiccant formulas, Van Air Systems is the original and leading manufacturer of deliquescent desiccants for drying compressed air and gases. From a definition standpoint, a desiccant is a hygroscopic substance used as a drying agent. Many are commonly encountered in packaging to keep the contents dry and free from mold or mildew. However, for many industrial uses, deliquescent desiccants are a dependable, cost-effective, and energy-free tool for a wide range of industrial drying applications. Van Air Systems offers a variety of adsorbent desiccants, including activated alumina, silica gel, and molecular sieve. These desiccants are used in point-of-use applications, as well as in regenerative drying applications.
Dry-O-Lite, the industry-leading deliquescent desiccant, is a chemical drying agent specifically formulated for Van Air Systems single tower compressed air dryers and natural gas pipeline dryers. Dry-O-Lite is a dense hygroscopic tablet that absorbs water vapor from streams of compressed air or gas. The surface of the desiccant tablet dissolves slowly, forming a brine solution which drops from the surface. The tablet continuously dissolves, or deliquesces, until the desiccant is fully consumed. In a properly sized D-series Compressed Air Dryer or Pipeline Dryer, Dry-O-Lite will establish a relative humidity of 55%, which equates to a dew point approximately 20°F lower than the temperature of the compressed air or gas at the inlet of the dryer.
>> Up to 20 degrees dew point suppression
>> Low cost
>> Energy free
>> Environmentally friendly
>> Up to a 55% equilibrium RH
SP is a leading deliquescent desiccant formulated primarily for the dehydration of natural gas for use in Van Air Systems Pipeline Dryers when the gas temperature is below 80°F. SP is a dense hygroscopic tablet that absorbs water vapor. The surface of the desiccant tablet dissolves slowly, forming a brine solution which drops from the surface. The tablet continuously dissolves, or deliquesces, until the desiccant is fully consumed.
Van Air Systems deliquescent desiccants, including SP, are non-toxic and fully water soluble. In a properly sized Pipeline Dryer, SP will establish a relative humidity of 33%, which equates to a dew point approximately 30°F lower than the temperature of the gas at the inlet of the dryer.
>> Up to 27 degree dew point suppression
>> For operating temperatures 70°F and below
>> Inhibits natural gas hydrate formation
>> Prevents gas line freeze-ups
>> Up to a 33% equilibrium RH
10BF is the most effective deliquescent desiccant from Van Air Systems. Formulated primarily for the dehydration of natural gas and for use in Van Air Systems Pipeline Dryers, 10BF is a dense hygroscopic tablet that absorbs water vapor. The surface of the desiccant tablet dissolves slowly, forming a brine solution which drops from the surface. The tablet continuously dissolve, or deliquesces, until the desiccant is fully consumed. Van Air Systems deliquescent desiccants, including 10BF, are non-toxic and fully water soluble. In a properly sized Pipeline Dryer, 10BF will establish a relative humidity of 13%, which equates to a dew point depression of approximately 50-60°F.
>> For operative temperatures 100°F and lower
>> Cam be used to replace TEG systems
>> Prevents air and gas line freeze-ups
>> Up to a 63 degree dew point suppression
>> Up to a 13% equilibrium RH
Natural gas or process gas dehydration at low pressures, low flow rates, and / or low temperatures can be very difficult. Most conventional salt-type absorbent desiccants are unable to adequately dry gas to low water content under these conditions. 4UF was developed to meet low dew point requirements when other desiccants or glycols cannot.
4UF can be used by itself or in combination with other grades of deliquescent desiccant, such as SP or 10BF Desiccant. In some applications, consumption is optimized when the process gas flows through the lower grade desiccant prior to the highly absorbent 4UF.
>> 7 lbs H20 . MMSCF gas is attainable @ 50 PSIG & 60°F
>> 20 lbs H20 / MMSCF gas is attainable @ 25 PSIG & 80°F
>> Used when gas line temperatures are below freezing
>> Uo ti a 4% equilibrium RH
Activated alumina is an aluminum oxide bead with an extremely porous structure and high surface area-to-mass ratio. Activated alumina has a wide variety of applications, including compressed air and gas drying. In compressed air and gas drying applications, activated alumina will achieve dew points -40°F to -100°F, depending on the dryer design.
In compressed air desiccant dryers, a 1/8″ (2-5 mm) activated alumina bead is most commonly used. The 1/4″ (5-10 mm) activated alumina bead is typically used as a pre-bed for supporting large desiccant beds or as a buffer for silica gel beds. The 3/16″ (5-10 mm) bead is used when pressure drop and surface area requirements fall between the 1/8″ and 1/4″ material.
>> Low to zero dust discharge
>> High adsorption capacity
>> Low abrasion
>> High crush strength
Molecular sieve is highly porous sodium aluminosilicate bead for the adsorption of a wide range of liquids and gases. It has a fixed pore size according to the material specification. Van Air Systems offers molecular sieve with a 4 angstrom pore size. Because of its high comparative cost, molecular sieve is normally used for special process applications. In compressed air and gas drying applications, molecular sieve will deliver pressure dew point to -100°F, depending on dryer design and operating conditions.
>> Uniform capacity
>> Round bead
>> High moisture retention
>> Can achieve a -100°F dew point
Silica gel is a spherical bread consisting of 97% silica and 3% alumina with a highly porous surface and a strong affinity for adsorbing water. Silica gel is also applied as a selective adsorbent for a wide-range of hydrocarbons, C02, siloxanes, sulfur, and many other compounds. Because silica gel fractures in the presence of liquid water, it is often protected with a pre-bed of activated alumina. In air and gas drying applications, dew points of -40°F and lower can be achieved with silica gel.
>> High moisture retention capacity
>> Ability to achieve -40°F and lower dew points
>> Uniform bead shape
>> Provides visual indication of desiccant condition, indicating colors (blue = dry; pink = wet)