Packed towers Berl saddles

Berl Saddle. A chemical stoneware shape for the packing of absorption towers it is saddle-shaped, size about 25mm, and approx. 60000 pieces are required per m. A packing of Berl Saddles provides a very large contact surface and is a most efficient type of ceramic packing. (Patented in Germany by E. Berl 1928). 

You are using a small tower packed with Berl saddles to effect absorption of 99% of the H2S in an effluent gas. The equilibrium line for the absorbing liquid you are using is... 

An existing lO-in. I.D. packed tower using 1-inch Berl saddles is to absorb a vent gas in water at 85°F. Laboratory data show the Henry s Law expression for solubility to be y = 1.5x, where y is the equilibrium mol fraction of the gas over water at compositions of x mol fraction of gas dissolved in the liquid phase. Past experience indicates that the Hog for air-water system will be acceptable. The conditions are (refer to Figure 9-68). 

Then height of tower packing, using 1-in. Berl saddles ... 

Berl saddles, Lessing rings, Nielson propeller packing, Hechenbleikner blocks, Stedmann packing, Bregeat multiple spirals etc. Here, as in the case of plate towers, the liquid flows from the top of the tower and the gas enters at the bottom... 

The amount of liquid holdup in the packing is of interest when the liquid is unstable or when a desirable reaction is to be carried out in the vessel. A correlation for Raschig rings, Berl saddles, and intalox saddles is due to Leva (Tower Packings and Packed Tower Design, U.S. Stoneware Co., Akron, OH, (1953) ... 

Berl Saddles. P ieces of chemical porcelain, chemical stoneware or carbon in the shape of saddles, used for packing absorption tower or distn columns. They are manufd under trade name "Intalox Saddles" by the US Stoneware Co, Akron 9, Ohio... 

A benzene-toluene mixture is to be separated in a tower packed witii 1-in. Berl saddles. The feed is 55.2 mol% (liquid feed, saturated), and an overhead of 90 mol% benzene, and bottoms of not more than 24 mol% benzene is desired. Using the data of Ref. 51 plotted in Figure 9-98, determine the number of transfer units in the rectifying and stripping sections using a reflux ratio (reflux to product, L/D) = 1.35. 

Figure 6.10 Typical tower packings (a) Raschig ring, (b) Lessing ring, (c) Berl saddle, and (d) Pall ring [5]. Reprinted by Permission of John Wiley and Sons, Inc. Copyright 1980.

Common tower packings (a) Raschig rings (A) metal Pall ring (c) plastic Pall ring (d) Berl saddle ... 

An S-ft-diameter column packed with 20 ft of 1-in. Berl saddles has air at 1.5 atm and 40°C flowing through it. The tower is apparently close to flooding, since Ap = 24 in. of water. The mass velocity of the liquid is 8.5 times that of the gas. (a) If the tower were repacked with l in, Intalox saddles, what would the pressure drop be (6) How much higher flow rates could be used if the pressure drop were the same as it was with the Berl saddles ... 

Repeat Example 6.17 for a tower packed with 50-mm ceramic Berl saddles. 

Packing for towers consists of rings, berl saddles, Fiberglas pads, and helices (see Perry s Chemical Engineers Handbook, 3d ed., p. 685). Because of uncertainties of scale-up and ease of flooding, packed towers are seldom used for large-scale operations, being limited to diameters less than 2 ft. 

Specially shaped packings for tower internals were introduced to improve the gas-liquid contact while reducing the pressure drop in the towers. These were partition rings, raschig rings, intalox saddles, berl saddles, etc., made of ceramic materials. 

A more effective type of tower is to pack the column with packing such as Raschig rings or Berl saddles, which cause the droplets to coalesce and redisperse at frequent intervals throughout the tower. Detailed discussions of flooding and construction of packed towers are given elsewhere (Tl, PI). 

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