Process for purifying gas streams using composite adsorbent
A composite adsorption and airflow technology, applied in the direction of adsorption, silicon compounds, inorganic chemistry, etc., can solve problems such as explosion hazards
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Embodiment 3
[0031] Such composite adsorbents may alternatively contain metal oxides other than alumina, such as iron oxide.
[0032] as figure 1 As shown in , the air to be purified is supplied from an air inlet 12 to a main air compressor system 10 wherein it is compressed by a multi-stage compressor before and after cooling with water by heat exchange. Optionally, the compressed air feed is sub-cooled in cooler 8 . Cooled compressed air is supplied to an inlet manifold 14 containing inlet control valves 16 and 18 to which is connected a pair of adsorbent beds containing vessels 20 and 22 . The manifold is connected downstream of the control valves 16 and 18 to an exhaust manifold 24 containing exhaust valves 26 and 28 which are used to close and open the upstream ends of the respective adsorbent vessels 20 and 22 via silencers 32. Connection with the exhaust port 30. Each of the two adsorbent beds 20 and 22 contains two adsorbents. The lower portion of each of the adsorbent beds is ...
Embodiment 1
[0042] Activated alumina (Alcan AA-300 TM , 320m 2 / g), high surface area silica gel (Davison Bead Gel TM , 750m 2 / g, 99.6% silica), alumina / silica gel composite (Engelhard Sorbead WS TM , 650m 2 / g, 3% alumina / 97% silica) and low surface silica (Davison Grade 55 TM , 300m 2 / g, 99.6% silica), the water adsorption isotherm was determined. These water isotherms are shown in figure 2 middle.
[0043] figure 2 The results in indicate that high surface (HSA) silica gel exhibits the highest water capacity of the materials tested. However, when the HSA silicon limb was placed in liquid water it ruptured. The alumina / silica composite adsorbent has a slightly lower water capacity, but it is stable in liquid water. Thus, the alumina / silica composite adsorbent combines the high water capacity required by TSA and PSA dryers with the required stability to liquid water. Low surface area silica gel is stable to liquid water, but it has a very low water capacity.
Embodiment 2
[0045] Water breakthrough curves were determined for the activated alumina and alumina / silica composite samples used in Example 1. These breakthrough curves were performed at 25°C in water-saturated air. Feed pressure is 135psig (9.31kPa), flow rate is 55lbmoles / hr / ft 2 (2.7×10 5 moles / hr / m 2 ), the particle size of the adsorbent averaged 3.6 mm, and the tower was 6 feet (1.8 m) long and 1 inch (2.5 cm) in diameter. Water breakthrough was determined with a dew point probe and an outlet dew point of -45°C was used to define water breakthrough. The results of the penetration test are shown in image 3 middle.
[0046] image 3 Shows how long it takes for water to break through the -45°C dew point at different total bed sorbent contact times. For a dehydration bed with a relative breakthrough time of 4, image 3 The alumina contact time was shown to be 3.9 seconds. For the alumina / silica gel composite, the contact time was 2.2 seconds. Since both adsorbents were tested ...
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