Holdup and pressure drop studies in structured packings with catalysts

Determination of liquid hold-up and flow distribution inside modular catalytic structured packings

“…Liquid hold-up correlations proposed for corrugated structured packings and single-phase trickle beds have been adapted to the Katapak-SP geometry and used to relate the measured liquid hold-up with the liquid flowrates outside and inside the catalytic baskets, respectively. Similarly to previous studies on catalytic packings (Moritz and Hasse, 1999;Hoffmann et al, 2004;Ratheesh and Kannan, 2004;Behrens et al, 2006Behrens et al, , 2008, the present analysis has been differently approached for high and low liquid loads. The starting point of the analysis is to write the total liquid flowrate as the sum of two contributions:…”

“…1d). Following the nomenclature introduced by Hoffmann et al (2004) for Multipak, the predecessor of Katapak-SP, and adopted for Katapak-SP by different authors (Ratheesh and Kannan, 2004;Behrens et al, 2006;Olujić and Behrens, 2006) the open channels, OC, correspond to the separation zones where the corrugated sheets are placed, outside the catalytic baskets, CB, and excluding the wall wipers circular section, WW.…”

“…The liquid flow splitting has been determined using the 0.1 m internal diameter column filled by 10 Katapak-SP 11 packings, by means of an experimental arrangement similar to the one suggested by Ratheesh and Kannan (2004). The experimental arrangement is sketched in Fig.…”

“…For Katapak-SP 12, collecting experiments have been carried out by Ratheesh and Kannan (2004) on a column of nominal diameter equal to 100 mm and catalytic baskets filled by resin spheres. The authors proposed a correlation for the liquid distribution between catalytic baskets and corrugated sheets.…”

“…global values. Dynamic hold-up measurements have been reported for Katapak-SP 12 of different nominal sizes, from pilot scale of 100 mm and 250 mm (Ratheesh and Kannan, 2004;Götze et al, 2001) to industrial scale of 450 mm . As far as Katapak-SP 11 is concerned, dynamic hold-up data have been measured on packings of diameter equal to 50 mm and 100 mm (Brunazzi and Viva, 2006;Viva and Brunazzi, 2007) and on the industrial packing size of 450 mm .…”