Membrane separation

Xem 1-20 trên 52 kết quả Membrane separation
  • The study of catalytic membranes and membrane reactor processes is a multidisciplinary activity, which in recent years has attracted the attention of scientists and engineers in a number of disciplines, including materials science, chemistry and biology, and chemical and biochemical engineering.

    pdf0p camnhung_1 14-12-2012 39 7   Download

  • This handbook emphasizes the use of synthetic membranes for separations involving industrial or municipal process streams. Little will be said concerning the use of membranes in medical applications as in artificial kidneys or for controlled drug release. Most of the membrane processes are pressure driven. The notable exception to this is electrodialysis (ED) by which ions are separated under the influence of an electric field. In addition, the chapter on coupled transport covers processes which are driven under the influence of a concentration gradient....

    pdf619p gian_anh 18-10-2012 62 23   Download

  • Cell membranes act as barriers to most, but not all, molecules. The development of a cell membrane that could allow some materials to pass while constraining the movement of other molecules was a major step in the evolution of the cell. Cell membranes are differentially (or semi-) permeable barriers separating the inner cellular environment from the outer cellular (or external) environment.

    ppt35p nhocbuonthich 26-07-2011 49 10   Download

  • This is the first volume of Advances in Nanoporous Materials, a new book series devoted to the science and application of all kinds of nanoporous solids. Its intention is to publish comprehensive reviews of lasting value in the field of nanoporous materials written by renowned experts. Its scope covers all aspects of nanoporous solids, including their preparation and structure, their post-synthetic modification, methods for their characterization as well as their application in catalysis and adsorption/separation....

    pdf323p xrzc1-1 16-09-2013 32 10   Download

  • This book is dedicated to the rapidly grown field of microporous ceramic membranes with separating layers of pore diameter less than 2 nm. In spite of the recent rapid growth of the research effort directed towards the development of microporous ceramic membranes the field is still considered to be at its infancy and exhibits a significant future growth potential.

    pdf525p nhulan0908 30-09-2012 24 6   Download

  • Chemical reactions (abiotic reactions) are “classical” chemical reactions that are not mediated by bacteria. They may include reaction processes such as precipitation, hydrolysis, complexation, elimination, substitution etc. that transform chemicals to other chemicals and potentially alter their phase/state (solid, liquid, gas, dissolved). Precipitation is the removal of ions from solution by the formation of insoluble compounds, i.e. a solid-phase precipitate. Hydrolysis is a process of chemical reaction by the addition of water.

    pdf208p cao_can 29-12-2012 39 13   Download

  • Reactive liquid-liquid extraction of inorganic acids with amines and effect of solvating diluents; Liquid extraction of tall oil from wastewaters of paper industry • Supercritical fluid extraction of natural products; Enzymatic reactions in supercritical CO2; Solubilities of liquids and solids in dense CO2 with entrainer • Relation between the morphology and application properties of polymer catalysts and adsorbents • Study of the permeation and pervaporation of volatile organic substance (propan-1-ol, toluene) • Observation of the competitive adsorption on Vycor glass membr...

    pdf66p lulanphuong 22-03-2012 40 11   Download

  • 16 Membrane Separation 16.1 OVERVIEW Membrane separation has developed into an important technology for separating VOCs and other gaseous air pollutants from gas streams during the past 15 years. The first commercial application was installed in 1990, and more than 50 systems have been installed in the chemical process industry worldwide.1 The technology utilizes a polymeric membrane that is more permeable to condensable organic vapors, such as C3+ hydrocarbons and aromatics, than it is to noncondensable gases such as methane, ethane, nitrogen, and hydrogen.

    pdf3p tuongmatdo 12-12-2011 38 9   Download

  • They give sodium tail currents with relative longterm constants (Wright, et al., 1988). At lower doses more suble repetitive behavior is seen (Brodie and Aldridge, 1982). As with type I pyrethroids, the primary action is on the central nervous system, since symptoms correlate well with brain concentrations (Rickard and Brodie, 1985). As might be expected, both classes of parathyroid produce large increases in brain glucose utilization (Cremer et al. 1983).

    pdf468p conquynho32 15-09-2012 28 6   Download

  • One of the most fundamental Dodd-Frank changes affecting private funds is the elimination of the “private advisers” exemption from registration with the SEC as an investment adviser (also known as the “15-client” exemp- tion). In its place, Dodd-Frank created several new, but less comprehensive, exemptions, with the result that most U.S.

    pdf17p hongphuocidol 04-04-2013 24 6   Download

  • The internode of solid bamboo has significantly higher ash, 1% NaOH, alcohol- toluene and hot water solubles than the nodes [Mabilangan et al. 2002]. However, differences between the major chemical composition of node and internode fraction of bamboo are small [Scurlock 2000]; neither the number of nodes nor the length of internode segments would be critical to the utilization of bamboo for energy conversion, chemical production, or as a building material. Fujji et al. [1993] investigated the chemistry of the immature culm of a moso- bamboo (Phyllostachys pubescens Mazel).

    pdf224p loixinloi 08-05-2013 20 6   Download

  • Calculation of disposal costs may involve a set of tasks. It may be necessary to calculate material flows (an engineering exercise) from the plant's production process so that wastes can be desegregated and tracked. These material flows will then have to be translated into disposal costs. This calculation can be complex. Consider the issues that arise if the waste is destined for landfill disposal. First, there will be marginal disposal costs associated with transport of the waste. Second, the waste's contribution to landfill costs must be calculated.

    pdf12p taisaovanchuavo 26-01-2013 30 5   Download

  • Farmers have several general concerns about crop insurance voiced by national farm organizations representing a cross-section of American agriculture. The American Farm Bureau Federation (AFBF) and others would like USDA to address shallow losses, which occur when losses are significant for the farmer but not enough to trigger an indemnity. 31 Also, this group and others point out a need to address declines in actual production history (APH), which is used for determining the insurance guarantee.

    pdf23p quaivatxanh 29-11-2012 31 5   Download

  • PBgC’s financial assistance is not automatic. a plan must follow certain procedures to obtain financial assistance. First, it must notify PBgC and the plan’s participants that it is insolvent. Second, it must inform participants of their statutorily guaranteed benefit levels. next, it must apply for financial assistance with the PBgC. PBgC must then verify the insolvency and determine the level of financial assistance it will provide. This level depends on the amount of contributions and withdrawal liability payments the plan is receiving, if any.

    pdf33p quaivatxanh 30-11-2012 23 5   Download

  • Many of the early compliance models assumed that audits were expensive but that penalties could be imposed at low cost to the enforcing agency once an error had been detected. It is not surprising that those models typically showed that, subject to a fixed-budget constraint, the combination of high penalties and low audit rates was socially optimal (McCubbin, 2004). Those results are sensitive to several underlying assumptions. First, feelings about risk vary from one group to another; younger people, for example, could be less risk-averse than older people are.

    pdf37p quaivatxanh 01-12-2012 26 5   Download

  • The prospect of human cloning has been one of the most emotive and divisive issues to face UN negotiators and the international community in recent years. Despite widespread consensus amongst nations regarding the desirability of banning reproductive cloning, efforts to negotiate an international convention ground to a halt due to fundamental divisions regarding so-called research or therapeutic cloning.

    pdf114p thankinhphanliet 21-12-2012 32 4   Download

  • The Installation and Configuration Guide recommends saving and using the responses.properties file when installing VMware vCloud Director on additional server hosts, placing it in a location accessible to all target hosts. That recommendation is enhanced here with the requirement that the file only be made available to authorized individuals. Appropriate access controls should be placed on the “location accessible to all target hosts.” Any backups that are made should be carefully controlled and encrypted if your backup software supports that.

    pdf37p cao_can 02-01-2013 44 4   Download

  • In China, where population size is the biggest in the world and environmental destruction is proceeding due to the rapid economic growth and urbanization, there is a serious water pollution problem.

    pdf9p tainhacmienphi 19-02-2013 23 4   Download

  • Among monitors that were not turned off, those connected to computers that were off or absent had monitor power management rates of 98% (with desktop computers) and 100% (with laptops); monitors not off and connected to desktop computers that were in low power had a 96% monitor PM rate. In the remaining cases, the monitor may have been incapable of power managing (i.e., it was non-ENERGY STAR). Monitors not off and connected to...

    pdf20p dacotaikhoan 25-04-2013 13 4   Download

  • In this Unit, you will discover What molecules make up cells How the cell membrane separates cells from their external environment but allows substances into and out of the cell What special functions cell structures have and how these contribute to keeping an organism alive What processes in cells capture and release the energy needed for survival and how we harness these processes Cellular Functions It has been said that we are made of the stuff of stars. What do you think this means? The pine wood cells pictured on the right and all other organisms on Earth are made mostly of only...

    pdf0p coc_xanh 16-01-2013 20 3   Download

CHỦ ĐỀ BẠN MUỐN TÌM

Đồng bộ tài khoản