Mass transfer operations absorption and extraction of metals

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images mass transfer operations absorption and extraction of metals

Recent studies [ 2930 ] involve the use of ionic liquids as absorbers in membrane absorption systems. Conversely, a hydrophobic membrane would operate in the dry mode in this case because the pores would be filled with gas. In this process, a hydrophobic hollow fiber contactor is used to separate a feed solution containing a volatile solute stripping phase from the receiving phase of absorption solution. Summing up, the industrial design for a membrane gas absorption process must include an analysis of the optimum arrangement of in-series modules in parallel configuration, considering the pressure drop for each in-series circuit, the total membrane modules and the maximum permissible feed pressure for each module. The use of asymmetric hollow fiber membrane modules for absorption of H 2 S has been studied by Li et al. Theory Membrane gas absorption and stripping process is a gas-liquid contacting operation [ 8910 ]. In the case of hydrophilic membranes, the overall mass transfer can be expressed by:.


  • Keywords: Absorption, liquid-liquid extraction, separation processes, phase equilibrium, mass transfer, packed tower, plate tower, membrane contactor.

    Welcome, to the first lecture on Mass Transfer Operation – I. In this lecture, I will Like if you considered the extract metals from ores, we need perfumes from chemical separation methods which includes absorption, distillation, liquid-liquid.

    Video: Mass transfer operations absorption and extraction of metals Lecture 58: Tutorial on absorption and stripping

    Until the publicationof “Mass Transfer Operations,” texts gas absorption, and distillation. Part III (86 liquid operations deals only with liquid extraction.

    Video: Mass transfer operations absorption and extraction of metals Lecture 57: Fundamentals of absorption and stripping for natural gas processing

    Part IV.
    Problems related to the variation in the gas flow rate, changes in the SO 2 concentration or membrane fouling were not observed. These three different applications of the GFMA process can involve the recovery of the specie transferred through the membrane and captured in the absorber phase.

    Other applications consider the use of a variant of the membrane absorption system called gas-filled membrane absorption. The most common processes to remove H 2 S from gas streams are the gas absorption systems using water or different types of aqueous solutions such as sodium hydroxide, sodium carbonate [ 3 ], monoethanolamine MEA or diethaloamine [ 35 ] and ferric solutions of ethylenediaminetriacetic acid EDTA and hydroxyethylethylenediaminetriacetic acid HEDTA [ 36 ] and, more recently, ionic liquids [ 37 ].

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    images mass transfer operations absorption and extraction of metals
    MARCUS FIRE A GUN LYRICS RAP
    One of the first membrane absorption experiments using hollow fiber contactors for the simultaneous absorption of SO 2 and CO 2 considered the use of solutions of Na 2 SO 3 [ 33 ].

    Thus, solute transfer through the membrane is achieved according to the following sequence of steps, which are presented in Figure 5 : Solute transfer through a boundary layer of feed solution to be treated at the membrane surface.

    Nevertheless, the main design criteria of this technology have been poorly addressed in the literature. The gas-filled membrane absorption process has been developed to perform the absorption and stripping stages in only one step of hollow fiber membrane contactor [ 28 ]. The physical properties of this system, such as diffusion coefficients, viscosity and density of both phases must be established by using different theoretical or empirical relationships as function of system properties absolute pressure, temperature and composition.

    The chemical engineer's interest in mass transfer comes primarily from his traditional role as a specialist in the design of separation processes.

    This chapter​.

    students in the area of mass transfer operations with emphasis on separation and Principles of gas absorption; Single and Multi component absorption; Absorption with L-L equilibria, Staged and continuous extraction, Solid-liquid equilibria, Leaching Principles. Sieve trays are simply metal plates with holes in them. Introduction to Mass transfer operations, molecular diffusion in fluids, binary the term mass transfer operations which include techniques like gas absorption and stripping, liquid-liquid extraction, leaching, distillation, humidification, drying, The third generation random packing materials are numeral; (a) Intalox Metal.
    The physical properties of this system, such as diffusion coefficients, viscosity and density of both phases must be established by using different theoretical or empirical relationships as function of system properties absolute pressure, temperature and composition.

    The resistances-in-series model is based on one-phase diffusion i. Moreover, a technical and economic study was carried out, comparing the GFMA process to recover HCN in gold mining and the conventional process, which uses stripping and absorption stage, separately, in packed towers [ 43 ].

    images mass transfer operations absorption and extraction of metals

    How to cite and reference Link to this chapter Copy to clipboard. In the case of hydrophilic membranes, the overall mass transfer can be expressed by:. The absorption of CO from N 2 -CO mixtures has been reported in the literature [ 34 ] using a hollow fiber module containing porous polypropylene fibers Celgard X and an ammoniacal cuprous chloride solution as receiving phase.

    As phase contactors, these types of modules are conformed by a bundle of porous hollow fibers, which are arranged in a housing.

    images mass transfer operations absorption and extraction of metals
    Mass transfer operations absorption and extraction of metals
    The selected polypropylene membranes seem to show a good chemical resistance to the solutes present in the absorption solution.

    In the case of hydrophilic membranes, the overall mass transfer can be expressed by:. Edited by Hongbo Du.

    These altered flows will not cause flooding, as they might in a packed tower [ 8 ].

    images mass transfer operations absorption and extraction of metals

    Thus, one of the phases is circulated into the lumen side; meanwhile, the other phase flows through the shell side. These aspects will increase the applications of these types of processes in the mid-term.

    4 thoughts on “Mass transfer operations absorption and extraction of metals”

    1. For the driving force based on liquid phase and the gas phase flowing by the shell side and liquid phase by the lumen side.

    2. Scheme of the gas-filled membrane absorption process, which shows two gas-liquid interfaces at the pore entrances. In this chapter, the most common applications of gas membrane absorption processes are described.

    3. Nevertheless, the main design criteria of this technology have been poorly addressed in the literature.