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Adsorption regeneration steam

Activated carbon adsorption generally uneconomical for removal of >1000 ppm contaminant from large stream unless bed regenerated steaming often easiest regeneration method but creates new wastewater problem usually 3—5 kg steam requited per kg of carbon for regeneration. [Pg.453]

MTZ (mass transfer zone). 500. 501 multicomponent data, 503 operating cycles, 502 operating parameters, 502 operating practices, 504 packed beds, 500-504 regeneration, 502, 504 regeneration steam, 502 Adsorption equilibria, 495,497... [Pg.747]

For the exhausted adsorbents from gas phase adsorption, regeneration by thermal desorption is most commonly used. For example, activated carbon used to prevent contamination of air by organic solvents of low concentrations, and silica gel, activated alumina or zeolite used for dehumidification of gases are regenerated by high temperature steam, air or inert gases. In the case of organic adsorbates... [Pg.206]

Boudou et al. (2003) introduced nitrogen groups into a viscose-based ACC by reaction with ammonia/air at 300 °C and by reaction with ammonia/steam at 800 °C. Extensive surface characterizations were carried out. Ammonia/steam treatment was more effective for the adsorption of H2S or SO2 by enhancing the microporosity and by modifying the distribution of the surface oxygen complexes. A series of successive adsorption-regeneration cycles showed important differences between the oxidation retention of H2S and SO2. [Pg.417]

Steps. Thermal-swing cycles have at least two steps, adsorption and heating. A cooling step is also normally used after the heating step. A portion of the feed or product stream can be utilized for heating, or an independent fluid can be used. Easily condensable contaminants may be regenerated with noncondensable gases and recovered by condensation. Water-iminiscible solvents are stripped with steam, which may be condensed and separated from the solvent by decantation. Fuel and/or air may be used when the impurities are to be burned or incinerated. [Pg.279]

Do not regenerate molecular sieves by steaming water typically is strongly adsorbed and may not be easily displaced by adsorbent in next adsorption cycle. [Pg.453]

Other types of regenerators designed for specific adsorption systems may use solvents and chemicals to remove susceptible adsorbates (51), steam or heated inert gas to recover volatile organic solvents (52), and biological systems in which organics adsorbed on the activated carbon during water treatment are continuously degraded (53). [Pg.532]

Two other methods worth discussing are wet air oxidation and regeneration by steam. Wet oxidation may be defined as a process in which a substance in aqueous solution or suspension is oxidized by oxygen transferred from a gas phase in intimate contact with the liquid phase. The substance may be organic or inorganic in nature. In this broad definition, both the well known oxidation of ferrous salts to ferric salts by exposure of a solution to air at room temperature and the adsorption of oxygen by alkaline pyrogallol in the classical Orsat gas analysis would be considered wet oxidations. [Pg.318]

Solvent recovery with adsorption is most feasible when the reusable solvent is valuable and is readily separated from the regeneration agent. When steam-regenerated activated-carbon adsorption is employed, the solvent should be immiscible with water. If more than one compound is to be recycled, the compounds should be easily separated or reused as a mixture. Only very large solvent users can afford the cost of solvent purification by distillation. ... [Pg.1260]

Example 10.4 A gas mixture with a flowrate of 0.1 m3 s-1 contains 0.203 kg m-3 of benzene. The temperature is 10°C and the pressure 1 atm (1.013 bar). Benzene needs to be separated to give a gas stream with a benzene concentration of less than 5 mg m-3. It is proposed to achieve this by adsorption using activated carbon in a fixed bed. The activated carbon is to be regenerated using superheated steam. The experimental adsorption isotherms cannot be adequately represented by Freundlich isotherms and, instead, can be correlated at 10°C by the empirical relationship ... [Pg.192]


See other pages where Adsorption regeneration steam is mentioned: [Pg.559]    [Pg.829]    [Pg.29]    [Pg.1698]    [Pg.12]    [Pg.1692]    [Pg.269]    [Pg.272]    [Pg.29]    [Pg.626]    [Pg.312]    [Pg.279]    [Pg.285]    [Pg.388]    [Pg.44]    [Pg.346]    [Pg.293]    [Pg.535]    [Pg.1544]    [Pg.1547]    [Pg.1547]    [Pg.1547]    [Pg.297]    [Pg.467]    [Pg.279]    [Pg.283]    [Pg.284]    [Pg.289]    [Pg.294]    [Pg.317]    [Pg.319]    [Pg.292]    [Pg.1260]    [Pg.515]   
See also in sourсe #XX -- [ Pg.502 ]

See also in sourсe #XX -- [ Pg.530 ]

See also in sourсe #XX -- [ Pg.502 ]

See also in sourсe #XX -- [ Pg.502 ]

See also in sourсe #XX -- [ Pg.502 ]




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