Column for separating thermally unstable products

Calculation of hydrodynamic parameters for regular structured packings

“…, Ge Processing of the experimental data indicated that for the RSP, the relationship ζ G = F(Re Ge ) is the same in nature as for a tube with a circular section, a rectangular channel formed by two parallel plates [3,4], irregular packings [5], and a plane-parallel bundled packing [3,4,8], and it can be represented by an equation of the form where A and n are a coefficient and exponent, respectively, which can be determined for each specific packing.…”

“…The hydraulic resistance of the irrigated packing, which is functionally dependent on the travel speed of both phases [3][4][5]9], can be determined from the relationship (3) where ∆p wet is the hydraulic resistance of the irrigated packing; A, n, and m are a coefficient and exponents for the hypothetical flow velocities of both phases, respectively, as determined for each specific packing (see Table 2). Figure 6 shows the working relationship between the hydraulic resistance of the irrigated packing and the hypothetical gas velocity, and experimental data, as well as data on the hydraulic resistance, which were obtained from the Sulpak 5.1 packing-analysis program [9] developed by the Sulzer Chemtek Co. for the Mellapak 250.X packing.…”

“…The holding capacity of the packing is, as a rule, summed from the static and dynamic components [4,5,10]:…”

“…To obtain a working equation for determination of the holding capacity of RSP, we borrowed, as a basis, the func- from [3][4][5]12], where Re Ls = 4ρ L u Ls /(µ L a p ) is the Reynolds number for the liquid phase and Ga = ρ 2 L gsin α/(µ 2 L a p 3 ) is the Galileo number. As is apparent from Fig.…”

“…As is apparent from Fig. 7, the holding capacity of the packing, and the film thickness of the liquid also depend on the velocity of the gas in the column; its influence, however, is manifested at velocities exceeding 80% of the loading point [3,4]. In investigating the hydrodynamics of the packings, the loading point was not attained in the effective load range, and the experimental holding capacities obtained for the packing, and, of course, also the film thickness of liquid are constant when F k Φ,G = 0.7-2.5 m/sec(kg/m 3 ) 0.5 ; it is therefore suggested that the equation h op = ARe n Ls Ga m be used to determine the average film thickness of liquid for RSP in the range Re Ge = 500-2500.…”