Destillation, Absorption, Extraktion — Gibt es noch Forschungsaufgaben?

Molzahn, M; Wolf, D.

doi:10.1002/cite.330531003

Cited by 3 publications

(4 citation statements)

References 34 publications

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“…Studies by Weiß et al [11] as well as other authors [3,25] show that calculations based on these models in relation to irrigated classic packings such as Pall or Raschig rings used for rectification systems, are only in line with experimental data, if the quotients p/ p 0 , experimentally determined using the air/water system, are multiplied with the physical property quotients ρ L ρ W n 1 , ρ V ρ W n 2 , η L η W n 3 with experimentally derived exponents n 1 , n 2 , n 3 . This improves the accuracy of the experimental results, which can be given with a mean relative error of ±10−25%, [11].…”

Section: Literature Overviewmentioning

confidence: 97%

“…Mersmann [21,55] and Reichelt [1] give an accuracy of ±25% and ±20%, respectively. According to Molzahn and Wolf [25] as well as Blaß and Kurtz [42,43], the accuracy of the graphic correlations is ±50%.…”

Section: Literature Overviewmentioning

confidence: 99%

“…The accuracy of other methods [1,7,[46][47][48] in the same range is approximately similar. Schumacher [19], Billet [5], Teutsch [16] and Kast [45] Raschig rings made of metal and ceramic, Pall rings made of metal Billet [5], Teutsch [16], et al with Eckert's correlation Molzahn, Wolf [25] …”

Section: Literature Overviewmentioning

confidence: 99%

“…to Eq. (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) and Table ( We must determine the pressure drop of the irrigated, random 25 Acc. to Eq.…”

Section: Solutionmentioning

confidence: 99%

See 3 more Smart Citations

Pressure Drop of Irrigated Random and Structured Packings

Maćkowiak¹

2009

Fluid Dynamics of Packed Columns

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It is important to know the total pressure drop p of the irrigated packed bed when designing packed columns for gas/liquid systems in counter-current flow of the phases. In absorption as well as desorption processes, the total pressure drop p of the packing determines the blower capacity and thus the major part of the operating costs of the process. In rectification, the sum of the top pressure p T and the total pressure drop p gives the bottom pressure p W , which determines the bottom temperature t W . The bottom temperature, in turn, determines the effective temperature difference, at a given heating medium temperature, at which the reboiler in the distillation column must be operated.High pressure drops are likely to result in significant changes in the relative volatility along the column height, in particular in vacuum rectification processes with a high number of theoretical stages [5, 32], which means that the reflux ratios R, required to achieve the specified product purity, are considerably higher than in the case of low pressure drops p. Higher reflux ratios R lead to an increase in steam consumption and therefore in operating costs.The total pressure drop of the packing p at a known packing height H, the calculation of which was the topic of studies such as [13][14][15], is given by the product p = ( p/H)·H, in which the quotient p/H stands for the pressure drop per 1 m height of the packed bed.Based on the known pressure drop p/H and the specific pressure drop p/n t , Eq. (1-4) can be used to calculate the theoretical separation efficiency of the random or structured packing n t /H, and therefore the total height of the packed bed H, if the number of theoretical stages n t is known.

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Section: Literature Overviewmentioning

confidence: 97%

Section: Literature Overviewmentioning

confidence: 99%