Packing data Pall rings, metal

Figure 9-26. SLE Data Chart for 1-in. metal Pall rings, aqueous systems, pressure drop only. Data from 15-84 in. dia. test columns with packed heights of 2-10 ft. Reproduced with permission of the American Institute of Chemical Engineers, Kister, H. Z. and Gill, D. R., Chemical Engineering Progress, V. 87, No. 2 (1991) p. 32 all rights reserved.

Figure 13.45. Number of stages per meter (reciprocal of HETP), pressure loss per meter and pressure loss per theoretical stage in a 500 mm dia column filled with metal pall rings. Other charts in the original show the effects of packing height and column diameter, as well as similar data for Raschig rings (Billet, 1979). (a) Methanol/ethanol at 760Torr and total reflux in a column 500 mm dia. (b) Ethylbenzene/styrene at 100 Torr and total reflux in a column 500 mm dia.

To continue with the ethylbenzene/styrene separation of the immediately previous problems, now consider the use of a random packing for the fractionator. In Problem 12.8, for 50-mm metal Pall rings, a column diameter of 3.21 m (10.5 ft) would be required to operate at 80% of flood. Now estimate the efficiency of this same packing for the same service. The basic data are given in Problems 12.6 through 12.9. A packed height of 6.0 m will be assumed. 

In distillation, maximum operational capacity (sometimes called efficient capacity because of the nature of the definition) is determined by the amount of liquid entrainment required to reduce separation efficiency (see Chapter 7). Data of Strigle and Rukovena for IMTP, metal Pall Ring, and ceramic Intalox saddle packings indicate that the pressure drop at maximum operational capacity is [11] ... 

Metal Pall rings belong to the group of classic packing elements, which are still the most widely used packings today. There is a large amount of experimental and accurate data available, taken by Billet [13] and [7, 8, 14, 16, 17], which illustrates the influence of... 

The resistance coefficient xjr, as shown in Figs. 3-2 and 3-3, was determined using experimental pressure drop data for different columns equipped with metal Pall rings, with column diameters of ds = 0.150—0.8 m, and with various systems. As can be seen in Figs. 3-4a and 3-4b, the resistance coefficient is independent of the packing density N and the column diameter ds for diameter ratios of ds/d > 6 throughout the entire flow... 

The applicabiKty of Eq. (4-50) for determining the pressure drop of irrigated random packings at laminar liquid flow for Reynolds numbers in the range 0.1 < ReL < 2, was verified based on experimental pressure drop data for 25 mm metal Pall rings, taken by... 

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.

---