Packings 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.)...

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. 

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. 

To determine the tower diameter, consider the conditions at the bottom of the absorber where the maximum gas and liquid flow rates are found. Run the packed-tower design program of Appendix D using the data from Example 5.2 and packing parameters from Chapter 4. From Table 4.1 for 50-mm metal Hiflow rings ... 

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. 

Hiflow rings, structured Sulzer gauze packings (type BX), as well as type X sheet metal packings and Montz packings X with flow channels of a = 30° resulted in a higher flooding point constant Cfi,o. compared to Eq. (2-64), namely ... 

Figures 5-6, 5-7, 5-8, 5-9, 5-10, 5-11, 5-12, 5-13, 5-14 and 5-15 show the spread of the experimental pressure drop data for various random packings Pall, Bialecki and Hiflow rings, Mc-Pac and Envipac, VSP rings, Hackette, Top-Pak, Ralu-Flow, Ralu rings, Intalox saddles, Raschig rings, SR-Pak, R-Pak, Nor-Pac at al. as well as for structured packings.

Figure 5-8. Relative deviation S(Ap/H) of experimental data for determination of pressure drop (Ap/H)exp up to flooding point acc. to Eqs. (5 9) and (5 10), valid for 15 90 mm Hiflow rings and other random packings by RVT (Rauschert) made of metal, plastic and ceramic. No. of system see Table 2-2. Test conditions see Table 5 la x ...

Figures 7-2 and 7-3 show the dispersed phase hold-up x as a function of the specific flow rate uc of the continuous phase, using various specific flow rates ud of the dispersed phase as a parameter. The experimental data shown in Fig. 7-2 is applicable to different random packing elements, such as metal Pall rings, Biatecki rings, Hiflow rings with a dimension of 25-38 mm, whereas the data shown in Fig. 7-3 is valid for 50 mm tube columns and other structured packings. The test system used for the experiments under normal conditions was toluol (D)/water, which has a high interfacial tension and is...

Fig. 40. Performance data for metal packings Hiflow SO mm and Top Pak compared with 50 mm metal Pall rings in distillation of chlorobenzene/elhilbaizeiie at total reflux.

In Table 25, ta en from Billet [177], fee geometrical characteristics of different other structured packings are presentol, including stacked Pall rings and stacked Hiflow rings. 

Fig. 150. Pressure drop for one transfer unit (AP/I. HTUg) as a function of the is-side controlled volumetric mass transfer coefficient (Kca) at constant values of the ratio gas velocity-liquid superficial velocity (wo/I). Comparfeon of the new packing wifh some hi Iy efficient packings (Table 49). 1- Eurofiann, W(/L=166.7 w /mh 2- Hiflow ring 50, Wi/L =166.7 m /m 3-Hiflow ring 25, =166.7 m /m 4- Ii lsepao, Wi/L =166.7 m /m 5- Pall-ring 50, w/Z.

Fig. 1. Experimental isotherms for hot cooling in a packed bed column with 630 mm diameter, for Hiflow-Ring 25-7 PP at F fector equal to 1.35 Pa , at liquid superficial velocity 6.6...

Figure 9-6W. Rauschert Hiflow high-performance rings and saddles packing (plastic and metal). Used by permission of Rauschert Industries, Inc., div. of Rauschert GmbH Co. KG Paul-Rauschert-Str. 6 D-96349 Steinwiesen, Germany.

In the case of modern, lattice-type packings, such as Hiflow, Nor-Pac, VSP rings, PSL rings, R-Pac and Mc-Pac, the concurrence between the calculated values and the experimentally derived form factors cpp exp was also found to be satisfactory, as illustrated by the numerical example. 

Fig. 41. Performance data for plastic Hiflow and 25 mm Nor Pac packings compared with plastic 25 mm Pall rings in distillation of chlorobenzene/ethilbenzene at total reflux.

---