If the water permeation flux can be maintained and, thus enhancing the membrane selectivity. Vapour permeation and membrane distillation are two emerging membrane technologies for the production of vapour as permeate, which, in addition to wellestablished pervaporation technology, are of increasing interest to academia and industry. Several applications concerning endofpipe processes are industrially well established, such as solvent recovery e. Since the presence of nanofillers which can reduce the diffusion of molecules in the filled membrane, leading to a reduction of the total permeation flux 21. Its considered an attractive alternative to other separation methods like extractive distillation,molecular sieve for a variety of processes. According to franke 78, this model showed a fairly good agreement with the experimental data for a ternary feed mixture of water, ethanol, and butanol using a panpav pervaporation membrane. Silica nanoparticles snps, which were surfacemodified with surfactant hexadecyltrimethylammonium bromide ctab, were incorporated into the structure of the membrane. Additionally, osmotic membrane distillation omd of sucrose solutions was investigated. However, pervaporation involves higher capital cost than distillation processes. The immediate benefit from a pervaporation based irrigation system is salt rejection. The feed liquid is directly in contact with one side of the membrane, and the permeation of target compounds through the membrane, in a vapour phase, is achieved by the difference in chemical potential gradient established by a difference in the partial pressure. Principal of operation the membrane acts as a selective barrier between the two phases.
Application of pervaporation and osmotic membrane distillation to the regeneration of spent solutions from the osmotic food dehydration. From this study, it appeared that the selectivity of polysulfone psf, poly vinyl chloride pvc, and polyacrylonitrile pan decreases with decreasing membrane thickness, below a limiting value of about 15. A its considered an attractive alternative to other separation methods for a variety of processes. Pervaporation or pervaporative separation is a processing method for the separation of mixtures of liquids by partial vaporization through a nonporous or porous membrane. Apr 15, 2010 a novel pervaporation membrane with high free volume for water transport and solvent exclusion was studied for watersolvent separations. In harsh environments, more robust membranes are required and feed can be liquid pervaporation or saturated vapor vapor permeation 0. Pervaporation characteristics in removal of benzene from. Polyvinyl alcohol pva is one of the important membrane pervaporation materials for the dehydration of organic mixtures owing to its good chemical stability, filmforming ability and high hydrophilicity, especially high water permselectivity in pervaporation separation of aqueous ethanol solutions4. Especially during the 1950s, the interest focused on pervaporation. Pervaporationmt5009 analyzing hitech opportunities semester 2, 20112012 see siew hui a0077625x too kim hui a0077025j hubert giam a0082070r chua wei sun a0082022x damien poh weiye a0076856m linda wibisono a0077098n 2.
Membrane performance is represented in terms of flux, sorption coefficient, separation factor, and. Pervaporation free download as powerpoint presentation. These parameters include feed temperature, feed concentration. Organophilic pervaporation brushes for organics recovery joseph grimaldi, joseph imbrogno, james chip kildu. Pervaporation is a membrane separation process used to separate mixture of dissolved solvents. Pervaporation pv is applied in liquid mixture separation by using nonporous membranes.
Applications of pervaporation conclusions and future prospects membrane processes. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Pervaporation membrane chemical process engineering. Pervaporation membrane separation processes membrane science. In this work, a poly1trimethylsilyl1propyne ptmsp mixedmatrix membrane was fabricated for the selective removal of 1butanol from aqueous solutions through pervaporation. Buy pervaporation membrane separation processes membrane science and technology on free shipping on qualified orders. Pervaporation of ethanolwater mixtures using bacterial. The separation factor is a measure of the selective removal of the desired component from the dilute solution and the flux represents the rate at which the permeate passes through the membrane per unit surface area per time abdehagh et al. The membrane shows a high mechanical, thermal and chemical stability and it can be operated ad broad watersolvent compositions without swelling like in traditional polymeric membranes.
A pervaporation irrigation system will deliver water only when the surrounding soil is not. A for example, with the low temperatures and pressures involved in pervaporation, it often has cost and performance advantages for the separation of constantboiling azeotropes. Pdf new trends in biopolymerbased membranes for pervaporation. Pervaporation membrane separation processes membrane. Pervaporation membranes have success in removal of components in dilute forms. In order to increase the yield of reaction, it is required to simultaneously remove the product of reaction. Scribd is the worlds largest social reading and publishing site. It allows the desired components of the liquid feed to read more. Pervaporation, vapor permeation and membrane distillation for industrial scale separations. The term pervaporation is a portmanteau of the two steps of the process. Pervaporation is attractive because the energy required for the separation is strongly reduced due to the selective vaporization of the permeating components only. Pervaporation is one of the most active areas in membrane research, and the pervaporation process has been shown to be an indispensable component for chemical separations.
Petro seps membrane distillation aqua sep systems can recover, purify, treat and clean hazardous water from mines, oil and gas fields, and industrial waste water. Pervaporation, a membranebased separation technology, provides competitive advantages over conventional separation techniques such as distillation and absorption processes in separating azeotropic mixtures, thermally sensitive compounds and organicorganic mixtures, as well as in removing dilute organic compounds from wastewater. The permeate flux or mass transfer rate across the membrane. In addition to the specific characteristics of the feed components and the membrane, the operating parameters influence the overall performance of a pervaporation process. Pervaporation is being seriously considered for wider commercial applications as a means of separating volatile liquids. The esterification reaction is reversible and has low yield. Thus, a hybrid process in principle combines the advantages of both separation techniques while the. The first paper was published by kober, who discovered the potential of pervaporation. Because the membrane is nonporous, little or no salt will pass through it. In developing pervaporation membranes, three important aspects must be well addressed.
In the years following kobers publication a number of papers were published describing membranes and processes for pervaporation. Design and performance of twophase flow pervaporation and. Modeling and analysis on pervaporation separation of composite zeolite membranes by stewart mann a thesis presented in partial fulfillment of the requirements for the degree master of science approved july 2014 by the graduate supervisory committee. The method of pervaporation combines, in a single unit operation, selective membrane permeation of species with their subsequent evaporation i. We use our know how to design membrane based solutions for the separation of organic substances. Experimental study and simulation of concentration of. Pervaporation, vapour permeation and membrane distillation.
Box 124, se22100 lund, sweden received 22 march 2000. Pervaporation is the selective evaporation of one of the components of a liquid mixture using a membrane. The used membrane is a dense nonporous membrane or a very finelyporous ceramic membrane that displays an affinity towards the component one wants to remove. In recent years there has ken increased interest in the use of pervaporation membrane separation techniques for the selective separation of organic liquid mixtures, because of its high. Jerry lin, chair mary lind david nielsen arizona state university august 2014. Chlorine dioxide is transferred by membrane pervaporation from one chamber filled with aqueous chlorine dioxidegenerating reactants or other chlorine dioxide donor medium across a gaspermeable hydrophobic membrane to a recipient aqueous medium filling a second chamber. Pervaporation, in its simplest form, is an energy efficient combination of membrane permeation and evaporation. The selectivity of a pervaporation membrane in a given separation is usually calculated by the dimensionless separation factor for a binary mixture consisting of components a and b, the separation factor. Results of pervaporation pv of sucrose and calcium chloride spent solutions were presented. Salt transport in polymeric pervaporation membrane pdf free. In this article, the pervaporation selectivity as a function of the membrane thickness is studied for the dehydration of acetic acid. Pervaporation process in the pervaporation process a liquid feed stream is first preheated to operating temperature and then routed to a membrane module. The salt concentration profile in the membrane was determined experimentally.
The word pervaporation itself is a combination of the words permeation, the transport through a membrane, and evaporation, the phase transition from the liquid to the vapor phase. Recent membrane development for pervaporation processes. Petro sep is a world leader in providing sophisticated and innovative membrane distillation and pervaporation membrane systems. Petro sep corporation clean tech solutions for the world. Pervatech produces cutting edge membranes, membrane modules and separation systems for pervaporation and vapour permeation applications. Isermann department of chemical and biological engineering and center for biotechnology and interdisciplinary. Pervaporation for the separation of acetonebutanolethanol. Pervaporation is a process using membrane to separate mixtures of dissolved solvent through evaporation of volatile components through a nonporous selective membrane. The permeate transported through the membrane is vapourised on the permeate side of the membrane and heat is dissipated from the feed. Membrane technology and applications third edition richard w. Journal of membrane science 187 2001 2337 pervaporation of volatile organic compounds from water i influence of permeate pressure on selectivity.
In the same vein, the membrane will be a barrier to pathogens and nonsoluble materials. A membrane for pervaporation is a microporous or dense membrane, which selectively transports components from a liquid mixture due to differences in sorption in the membrane matrix and in diffusion through the membrane to the permeate side. Pervaporation of volatile organic compounds from water pdf. Novel perfluorinated polymerbased pervaporation membranes. Membrane productivity is a measure of the quantity of a component that permeates through a specific area of membrane surface in a given unit of time. Pervaporation is a membrane process comparable to distillation1, and combines permeation and vaporisation. Pervaporation is reaching industrial maturity due to the accumulated experience in membrane manufacture and operation of pervaporation units. Modeling and analysis on pervaporation separation of.
689 865 803 1610 338 126 1393 842 653 835 1180 228 842 1519 529 200 213 1572 996 315 1537 1363 1471 1516 216 1201 1555 20 388 1183 851 506 627 1026