Adsorption purification of caprolactam from wastewaters in experimental-industrial conditions

Khodorov, E. I.; Tarabutkin, E. V.; Kachur, R. N.; Zubkov, P. A.; Kvasha, V. B.

doi:10.1007/bf00545534

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“…The scientific-technical concept of perfecting traditional sorption methods [7] includes the following elements: -scientifically justified selection of adsorbents that take into consideration the physiochemical characteristics and conditions of conducting the process; -development of an efficient method of conducting the process and a rational scheme for organization of flows of the interacting phases to increase the driving force of mass exchange and increase the concentration of sorbate in the outgoing absorber; -development of highly efficient and economical equipment for conducting the adsorption purification method used based on a correct physical model of mass exchange, determination of the limiting stages of the kinetics of the process, ea~d a description of the real hydrodynamic characteristics of the structure of flows in the working zone.…”

Section: The Basic Premises Of the Scientific-technical Conception Ofmentioning

confidence: 99%

“…The hydrodynamics of such adsorbers is a function of their implementation mad has a great effect on the efficiency of the process. The development of a physically correct model of"overflow" of the sorbent and formulation of the residence time distribution function (RTD) of the particles in the apparatus based on it are primarily hydrodynamic problems [29]. For cyclic regimes, the RTD of the solid phase cannot be described by a continuous function; the response curve in this case has a discrete character and is determined with consideration of the sorbent overflow conditions from section to section.…”

Section: Numerical Integration Of the Materials Balance Differential Ementioning

confidence: 99%

“…The RTD of the solid phase in a cyclic adsorber was determined from the response of the system to pulsed perturbation. A single pulse, according to the data in [29], represents the addition of a unit of mass of an inert indicator into the upper section after an infinitely small amount of time in the initial moment of the cycle. Removal of the indicator from the system, which takes place for whole-number values of the cycle number, corresponds to function fd of thediscrete residence time (FDRT) in the system.…”

Section: Numerical Integration Of the Materials Balance Differential Ementioning

confidence: 99%

“…For the model of transport of the solid phase described above, there is a characteristic DRT for each series of parameters. The general expressions for FDRT [29] used to compare functions F a for a 5-tray column for ~ = 0.95 and ~, = 0; 0.1 with the F curve for a continuous adsorber with N = 5, 50, were obtained by the method of mathematical induction. A comparative analysis of the F d and F curves indicates that the spectrmn of the particle residence time in the system is significantly narrowed in the regime of discrete movement of the sorbent along the column.…”

Section: Numerical Integration Of the Materials Balance Differential Ementioning

confidence: 99%

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Adsorption purification of liquid flows applied to no-waste chemical fibre technologies. Review

Khodorov¹,

Kvasha²

1999

Fibre Chem

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The basic premises of the scientific-technical conception of perfection of traditional methods of adsorption purification based on the use of granulated and ground sorbents were analyzed. The expediency and efficiency of using cyclic regimes in tray-contact adsorbers was justified as a priority direction of the idea. Tasks for the further progressive introduction of the leading technology and equipment in adsorption purification practice were formulated. However, the number of sorption processes in chemical fibre technologies is comparatively small and is usually limited to traditional sorption filters with a stationary bed. Attempts to utilize adsorption for purification of WW and process solutions have usually been unsuccessful. These failures were due to the incorrect selectiou of the physicochemical conditions for adsorption of dissolved substances or regeneration of absorbers and imperfect equipment and technological formulation of the processes.The basic requirements for low-waste sorption processes for decontaminating emissions were formulated in [6] based on the general principles of no-waste technology:-ensuring the maximum possible degree of saturation of file adsorbent and consequently decreasing the amount of sorbent required for conducting the process; increasing the time between regenerations; -decreasing the required amount of absorbers while preserving the overall efficiency of the mass exchange process; -converting to process schemes with regeneration of the absorber and possible separation of desorbed products. In the general case, in selecting methods of regenerating sorbents, it is necessary to consider the physicochemical properties of the desorbed substance and the specific features of the plant in which WW and process solutions are formed. As a function of the type of purification (regenerative or destructive), regeneration of the sorbent is either associated with extracting absorbed substances from the sorbent and returning them to the production cycle or destroying them during desorption. Regenerative purification is usually used in local adsorption installations, since the wastewaters contain one or two substances which can be returned to basic production or utilized in the form of a commercial by-product. However, in local purification of low-concentration WW (100-150 rag/liter), the cost of the extracted product frequently cmmot colnpensate for the specific costs of decontaminating the wastes. For this reason, file selection of a scheme and consequently a method of desorption is determined not only by the physicochemical properties and value of the separated product, cost of the sorbent and outlays for regeneration, but also by the concentration of extractable substances in file WW sent for purification.All-Russian Scientific-Research Institute of Synthetic Fibres, Tver'.

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Section: The Basic Premises Of the Scientific-technical Conception Ofmentioning

confidence: 99%

Section: Numerical Integration Of the Materials Balance Differential Ementioning

confidence: 99%

Section: Numerical Integration Of the Materials Balance Differential Ementioning

confidence: 99%

Section: Numerical Integration Of the Materials Balance Differential Ementioning

confidence: 99%

See 2 more Smart Citations

Adsorption purification of liquid flows applied to no-waste chemical fibre technologies. Review

Khodorov¹,

Kvasha²

1999

Fibre Chem

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Adsorption purification of caprolactam from wastewaters in experimental-industrial conditions

Cited by 1 publication

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Adsorption purification of liquid flows applied to no-waste chemical fibre technologies. Review

Adsorption purification of liquid flows applied to no-waste chemical fibre technologies. Review

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