dvr Activated Alumina Desiccants

Activated alumina is highly porous material; this material can have a surface area significantly over 200 square metres/g. Very suitable for use as a filter of fluoride, arsenic and selenium in drinking water.

Activated Alumina is an aluminium oxide that is highly porous and exhibits tremendous surface area. Activated Alumina is resistant to thermal stock and abrasion and will not shrink, swell, soften nor disintegrate when immersed in water.
Surface area is in the range 345-415. Because it has a higher capacity for water than Silica Gel at elevated temperatures it is mainly used as a desiccant for warm gases including air. In many commercial applications zeolitic materials have now replaced it.
Purification of gases and liquids (removal of metallic traces, TBC and HF compounds).
Drying of organic liquids such as LPG, propylene, butene, steam cracked liquids, cyclohexane, gasoline, chloro- and fluorohydrocarbons, aromatic solvents.
Drying of air and gases such as steam cracked gases, catalytic reforming recycle gas, synthesis gas, natural gas, CO2.
Drying of organic liquids as LPG, aromatics, steam cracked liquids, gasoline, chloro- and fluorocarbons.
Drying of air and gases as steam cracked gases, catalytic reforming recycle gases, synthesis gases, methyl chloride, natural gas, LNG, etc.
Drying of hydrogen, oxygen, nitrogen, CO2, etc.
Purification of gases and liquids (removal of metallic traces, BF3, TBC, HCl, HF and fluorinated hydrocarbons).
Catalyst for Claus conversion in sub dew point processes.
Air drying (PSA, TSA)
Instrument air, supersonic wind tunnel, compressed air
Gas drying Air separation plants, inert and rare gases, Hydrogen, oxygen, nitrogen, CO2.
Natural gas in production and compression plants, LPG, LNG.
Aromatics, naphtha cuts and cracked gas.


Activated Alumina Desiccants:

Activated Alumina Desiccants is a porous form of aluminum oxide. It has a high surface area which adsorbs vapors without any change in form. Activated Alumina Desiccants  will not soften or disintegrate easily when immersed in water.

Dew points to -40°F and lower may be achieved with Activated Alumina Desiccants  depending on dryer design and operating conditions.

The 1/8%u201D (2-5mm) bead is the size most frequently used in regenerative dryers.

The 3/16%u201D (4-8mm) bead is used when pressure drop and surface area requirements fall between 1/8%u201D and 1/4%u201D material.  It is suitable for most systems.

The 1/4%u201D (5-10mm) bead Activated Alumina Desiccants  is used both as a pre-bed material to support large desiccant beds or as a buffer for silica gel beads. Pressure drop is slightly lower than 1/8%u201D (25mm) material. 

If size is not known or specified, the 1/8%u201D (2-5mm) size is usually satisfactory. However, if Activated Alumina Desiccants is used in a regenerative dryer and the desiccant retaining screens cannot be measured, the 1/4%u201D (5-10mm) size should be used as a bed support (6%u201D layer). If at all possible, obtain a sample and measure it  before ordering.

Product Benefits:

  1. High adsorption capacity. With high surface area and excellent pore distribution, Activated Alumina Desiccants  has a high water adsorption capacity. This reduces initial cost, energy consumption and operating costs through smaller bed sizes and/or longer operating cycles.
  2. Low abrasion. Insures less dusting during tower depressurization or loading. Low abrasion means low pressure drop and a reduced chance of plugging the afterfilter.
  3. Resists liquid water. Water slugging due to upstream failure of aftercooler, separators or drain traps will not fracture the alumina beads. The adsorption capacity of the desiccant can be restored after complete regeneration.
  4. High crush strength. High crush strength, which limits dusting, is important during loading of desiccant towers. High crush strength makes alumina effective as a prebed material when used with other types of desiccants.
  5. Uniform bead sizes. Activated Alumina Desiccants is a uniformly sized bead. It provides low pressure drop to minimize channeling and ensures utilization of the full bed column section.

Physical Properties:

  1/8%u201D (2-5mm) 3/16%u201D(4-8mm) 1/4%u201D (5-10mm)
Color and form  White  bead  White  bead  White  bead
 Bulk density  48 lbs/Ft3  48 lbs/Ft3  48 lbs/Ft3
 Crush strength  17-30 lbs 145-60 lbs 50-70 lbs
 Surface area  1.74 x 106 sq ft/lb  1.65 x 106 sq ft/lb  1.59 x 106 sq ft/lb
 Static adsorption
            –            –              –
100% RH
90% RH
60% RH
10% RH

Also refer more details of Impregnated Activated Alumina with potassium permagnate KMNO4.

Potassium Permanganate Impregnated Alumina has strong oxidizing property with Potassium Permanganate (KMnO4), it has good efficienty in removing Hydrogen Sulfide(H2S) , Chlorine(Cl2), Formaldehyde(HCHO), Nitric Oxide (NO) & Sulfur Dioxide(SO2) from air. 

Note: This article uses material from the