Hiflow ring

Figure S.3 (Continued) Third generation metal random packings, (g) Hiflow ring ...

Figure 8.4 Third-generation plastic random packing , to) Cascade MiniRing (CMR ) (6) Hiflow ring. (Pori a, courtesy of Glitsch, Inc. port b, courtesy of Rauschert Industries, Inc.)...

CHART 10.2304 2" (M) HIFLOW RINGS FLOOD PRESSURE DROP... 

Hiflow Rings Metal, plastic Rauschert Industries... 

Based on these results, the Hiflow rings have a much greater capacity than the Raschig rings, since the required column cross-sectional area is reduced by 50%. 

When molasses is fermented to produce a liquor containing ethanol, a C02-rich vapor containing a small amount of ethanol is evolved. The alcohol will be recovered by countercurrent absorption with water in a packed-bed tower. The gas will enter the tower at a rate of 180 kmol/h, at 303 K and 110 kPa. The molar composition of the gas is 98% C02 and 2% ethanol. The required recovery of the alcohol is 97%. Pure liquid water at 303 K will enter the tower at the rate of 151.5 kmol/h, which is 50% above the minimum rate required for the specified recovery (Seader and Henley, 1998). The tower will be packed with 50-mm metal Hiflow rings and will be designed for a maximum pressure drop of 300 Pa/m of packed height. 

Now, we estimate the pressure drop for operation at 70% of flooding using the Billet and Schultes (1991a) correlation. From Table 4.1, for 50-mm metal Hiflow rings ... 

A cooling tower, 2 m in diameter, packed with 75-mm ceramic Hiflow rings, is fed with water at 316 K at a rate of 25 kg/m2-s. The water is contacted with air, at 300 K and 101.3 kPa essentially dry, drawn upward coun-tercurrently to the water flow. Neglecting evaporation of the water and changes in the air temperature, estimate the volumetric rate of airflow, in m3/s, which would flood the tower. 

Consider the absorber of Examples 3.7 and 5.2. The adsorber will be packed with 50-mm metal Hiflow rings. Estimate the dimensions of the absorber and the power required to pump the gas and the liquid through the tower. Design for a gas-phase pressure drop of 300 Pa/m of packed height. 

Consider the ethanol absorber of Example 4.4, packed with 50-mm metal Hiflow rings. Estimate the packed height required to recover 97% of the alcohol, using pure water at a rate 50% above the minimum and with a gas-pressure drop of 300 Pa/m. The system ethanol-C02-water at the given temperature and pressure obeys Henry s... 

Design a tower packed with 50-mm ceramic Hiflow rings for the carbon disulfide scrubber of Problem 5.11. Assume isothermal operation and use a liquid rate of 1.5 times the minimum and a gas-pressure drop not exceeding 175 Pa/m of packing. Calculate the tower diameter, packed height, and total gas-pressure drop. Assume that Ch for the packing is 1.0. 

Air at 300 K is used to dry a plastic sheet. The solvent wetting the plastic is acetone. At the end of the dryer, the air leaves containing 2.0 mol% acetone. The acetone is to be recovered by absorption with water in a packed tower. The gas composition is to be reduced to 0.05 mol% acetone. The absorption will be isothermal because of cooling coils inside the tower. For the conditions of the absorber, the equilibrium relationship is y. = 1.8 c.. The rich gas enters the tower at a rate of 0.252 kg/s, and pure water enters the top at the rate of 0.34 kg/s. The tower is packed with 25-mm metal Hiflow rings. Determine the dimensions of the tower. 

Repeat Example 6.16 for a tower packed with 50-mm metal Hiflow rings. Design for a 70% approach to flooding. 

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