Stage adsorption

Hobbs, S. and Barder, T. (1989) Two-stage adsorptive separation process for purifying 2,6 dimethylnaphthalene. US Patent 4,835,334. 

A three-stage adsorption isotherm is obtained for tetradecyltrimethylam-monium chloride (TTAC) [130] at the alumina interface at pH 10 (Fig. 37). At... 

By single- or three-stage adsorption with an adsorbent, 95% of an adsorbate A in an aqueous solution of C g needs to be recovered. When the linear adsorption equilibrium is given as... 

Let us mention Ya.B. s contribution to the theory of multi-stage adsorption, reflected in his Candidate of Sciences thesis. 

Single-Stage Adsorption Contact filtration can be carried out as a single-stage operation (Figure 10.8) either in a batch or a continuous mode. If we assume that the amount of liquid retained with the solid is negligible, the material balance for a solute gives... 

The various chromatographic processes employed in a packed-bed or an expanded-fluidized-bed configuration for polypeptide and protein separations involve four stages (adsorption, washing, elution, and regeneration) as a sequence of events. Typically, large quantities of liquid must be processed, with the feed concentration of the target polypeptide and protein possibly... 

Benfield LoHeat System (UOP) [677], The high thermal efficiency of this two-stage adsorption process using lean and semi-lean solvent is achieved by recompression of the flash steam with an injector or a mechanical vapor compressor. UOP has also developed a number of other process configurations [404], [669], [678] -[680], The diethanolamine promoter enhances the mass transfer by carbamate... 

In heterogeneous gas-solid systems, a catalytic reaction proceeds according to the following stages adsorption of the reactant on the surface of the catalyst, reaction on the surface, desorption of the products from the surface. AH these steps... 

Remarkable improvements have been reported experimentally regarding the optimization of the reaction yield, such as variations in the reaction temperature and solvent, and the introduction of special techniques (e.g. dry stage adsorption conditions , ultrasonication and photoirradiation employing a Xenon lamp ). 

There are three stages adsorption on clean surface (I), partial desorption by evacuation (II), and readsorption on the contaminated surface (III). For stage I,... 

Should solvent extraction be inapplicable as a primary purification stage, adsorption methods should be evaluated. Sequential use of ion exchangers and nonionic polymeric resins will often effect considerable purification. If the resins are to be used regularly such that >50 L will be used during a project, it will be more economical to obtain them directly from the manufacturers rather than from laboratory suppliers. Guidance in the use of ion exchangers is relatively sparse a useful introduction is provided by Harland (14) (see Chapter 5). 

Equations (II.9) and (11.12) of the multiplet theory for the first stage (adsorption) applied to reactions (11.40) give the system of equations... 

The condensation phase and reprocessing of the desorbate are carried out in the same manner as described for the single-stage plant. For example, a two-stage adsorption plant for the recovery of dichloromethane is able to clean a gas stream of3000 m /h to a residual solvent content of less than 20 mg/m. ... 

Single Stage Adsorption in a Vessel Adsorber with Adsorbent Packing... 

The adsorption of cationic polymers such as nonylphenol diethylamine, NP triethylamine, NP tetraethyl pentamine. Octyl phenol (OP) diethylene triamine, and OP tetraethylene pentamine from aqueous solutions on an activated carbon showed a two-stage adsorption. " low adsorptions the molecules were postulated to have flat orientation on the surface of the carbon. A reorientation of the molecules occurred in the second stage as the adsorption increased, until at saturation the molecules were almost perpendicular to the surface. The variation of heats of adsorption with surface coverage showed two inflections (Figure 7.26). 

The schematic diagram for a single-stage adsorption is shown in Fig. 15.11. The solution to be treated contains V dm water, and the pollutant concentration is reduced from Q to C<., mg solute per gram of solution. The amount of adsorbent added is Af g of adsorbate free solid, and the solute concentration on the adsorbent increases from to q i mg solute per gram adsorbent. If fresh adsorbent is used, q = 0. The mass balance equates the solute removed from the liquid to that picked up by the solid. 

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