SUPERCRITICAL WATER. A Green Solvent: Properties and Uses. Yizhak Marcus
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1 SUPERCRITICAL WATER
2 SUPERCRITICAL WATER A Green Solvent: Properties and Uses Yizhak Marcus
3 Copyright Ó 2012 by John Wiley & Sons, Inc. All rights reserved Published by John Wiley & Sons, Inc., Hoboken, New Jersey Published simultaneously in Canada No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, Inc., 222 Rosewood Drive, Danvers, MA 01923, (978) , fax (978) , or on the web at Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) , fax (201) , or online at permission. Limit of Liability/Disclaimer of Warranty: While the publisher and author have used their best efforts in preparing this book, they make no representations or warranties with respect to the accuracy or completeness of the contents of this book and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose. No warranty may be created or extended by sales representatives or written sales materials. The advice and strategies contained herein may not be suitable for your situation. You should consult with a professional where appropriate. Neither the publisher nor author shall be liable for any loss of profit or any other commercial damages, including but not limited to special, incidental, consequential, or other damages. For general information on our other products and services or for technical support, please contact our Customer Care Department within the United States at (800) , outside the United States at (317) or fax (317) Wiley also publishes its books in a variety of electronic formats. Some content that appears in print may not be available in electronic formats. For more information about Wiley products, visit our web site at Library of Congress Cataloging-in-Publication Data: Marcus, Y. Supercritical water : a green solvent, properties and uses / Yizhak Marcus. p. cm. Includes indexes. ISBN (hardback) 1. Solvents. 2. Green technology. I. Title. TP247.5.M dc Printed in the United States of America
4 CONTENTS Preface ix List of Acronyms and Symbols xiii 1 Introduction Phase Diagrams of Single Fluids / The Critical Point / Supercritical Fluids as Solvents / Gaseous and Liquid Water / Near-Critical Water / Summary / 17 2 Bulk Properties of SCW Equations of State(EoS) / PVT Data for SCW / Classical Equations of State of SCW / Scaling Equations of State for SCW / EoS of Supercritical Heavy Water / Thermophysical Properties of SCW / Heat Capacity / Enthalpy and Entropy / Sound Velocity / Electrical and Optical Properties / Static Relative Permittivity / Electrical Conductivity / Light Refraction / Transport Properties / Viscosity / Self-Diffusion / 41 v
5 vi CONTENTS Thermal Conductivity / Ionic Dissociation of SCW / Properties Related to the Solvent Power of SCW / Summary / 49 3 Molecular Properties of SCW Diffraction Studies of SCW Structure / X-Ray Diffraction Studies of SCW Structure / Neutron Diffraction Studies of SCW Structure / Computer Simulations of SCW / Monte Carlo Simulations / Molecular Dynamics Simulations / Spectroscopic Studies of SCW / Infrared Absorption Spectroscopy / Raman Scattering Spectroscopy / Nuclear Magnetic Resonance / Dielectric Relaxation Spectroscopy / The Extent of Hydrogen Bonding in SCW / The Dynamics of Water Molecules in SCW / Summary / 92 4 SCW as a Green Solvent Solutions of Gases in SCW / Phase Equilibria / Interactions in the Solutions / Solutions of Organic Substances in SCW / Phase Equilibria / Interactions in the Solutions / Solutions of Salts and Ions in SCW / Solubilities of Salts and Electrolytes / Thermodynamic Properties / Transport Properties / Ion Association in SCW / Ion Hydration in SCW / Binary Mixtures of Cosolvents with SCW / Summary / Applications of SCW Conversion of Organic Substances to Fuel / Conversion to Hydrogen and Natural Gas / Conversion to Liquid Fuel / Supercritical Water Oxidation / 157
6 CONTENTS vii General Aspects of SCWO Process / Examples of SCWO Applications / Uses of SCW in Organic Synthesis / Uses in Powder Technology of Inorganic Substances / Geothermal Aspects of SCW / Application of SCW in Nuclear Reactors / Corrosion Problems with SCW / Summary / 174 Author Index 183 Subject Index 199
7 PREFACE As of the summer 2011, there were more than 3000 topics dealing in detail with supercritical water (SCW) in the SciFinder literature search instrument of the American Chemical Society. However, there were more than 14,000 entries outlining this concept. In the 1980s some 100 papers and in the 1990s some 900 papers on supercritical water were published, while at present there are already more than 2000 papers. As it is impossible to compile all the published information in a book, an attempt has been made to include the maximum possible important properties and uses of supercritical water. Factual information is given in numerous tables along with suggested references for more details on the subject. Where appropriate, the reader is referred to several reviews relevant to the topics included in this book. Prior to 1980, only a few dozen papers dealt with SCW, considering SCW mainly within the broad subject of high-pressure steam in the context of electric power generation. The papers dealt principally with the heat transfer in SCW, mineral solubilities in it, and corrosion by it. E. U. Franck, a pioneer in the study of supercritical fluids, however, published in 1968 a review (Endeavour, 22, 55) that highlighted some of the properties of this fluid and its possible uses. The properties contrasted with those of water vapor and of the liquid water at ambient condition. They included the complete miscibility of SCW with nonpolar fluids, the very high mobility of ions from electrolytes dissolved in SCW, and the water itself acquiring appreciable electrical conductivity. Knowledge of the chemical behavior of high-temperature water, in the pure state and when serving as a solvent, led to the understanding of the structural features of SCWand of hydration phenomena in it. The properties of geochemically important hydrothermal solutions could also be explained and possible technical applications were suggested. The properties of dense steam or compressed hot water below the critical point and solutions in such media can be of interest, as these are able to act as green solvents. In the present book, the so-called near-critical water is however only cursorily dealt with, as it is mainly devoted to the properties and ix
8 x PREFACE uses of supercritical water. SCW in itself can also be deemed to be a green solvent, that is, environment-friendly. Having dealt for many years with liquids and solutions, the author s interest in SCW was raised by the proposal he received in the late 1990s from the INTAS agency for his participation in an international collaboration on this subject. During the period of 3 years of the project that involved three groups from Russia, one from Greece, one from Germany, and the present author, experimental and theoretical studies of supercritical aqueous solutions as a medium for new environmentally friendly and energy efficient technologies of pollution control were carried out. As a further result of this collaboration, one of the participants, A. Kalinichev, was invited together with the present author by R. Ludwig, the editor of the book Water: From Hydrogen Bonding to Dynamics and Structure, to write a chapter on SCW for it. This provided the initial impetus to the writing of the present book, seeing that none existed so far that summarized the state of the art and in view of the increasing interest in the subject as reflected by the increasing number of published papers. The book is divided into five chapters. Chapter 1 introduces supercritical fluids in terms of the phase diagrams of the fluids and their critical points. A brief description of a variety of supercritical fluids that have been used as solvents is given. Attention is then turned toward the water substance, in its gaseous state (water vapor) and ordinary liquid water and their properties. As water is heated toward the critical point, near-critical water is reached, and a short discussion of this state of water (that has found some applications as a green solvent) is presented. Chapter 2 deals with the macroscopic measurable properties. Foremost of these are the temperature pressure density or volume (PVT) relationships described by means of equations of state. Other important thermophysical properties of SCW are the heat capacity and the enthalpy and entropy. The electrical and optical properties include the static dielectric constant, the light refraction, and the electrical conductivity of neat SCW. The transport properties involve the viscosity, the self-diffusion, and the thermal conductivity. The ionic dissociation of SCW is then discussed, and finally the properties of SCW relevant to the solubility of solutes in it are briefly described. Chapter 3 deals with the structure and dynamics as inferred from experimental data and computer simulations. Diffraction of X-rays and in particular of neutrons provides information on the molecular structure of SCW. Computer simulations provide information on both the structure (by the Monte Carlo method) and the dynamics (the molecular dynamics method). Spectroscopic studies, involving infrared light absorption, Raman light scattering, nuclear magnetic resonance, and dielectric relaxation, complement the aforementioned studies. It is shown that SCW has appreciable hydrogen bonding between its molecules and the extent of this is explored. Finally, the dynamics of the water molecules in SCW and the lifetime of various
9 PREFACE xi configurations in it are discussed. Chapter 4 describes the solubilities of gases, organic substances, salts, and ions in SCW in terms of the relevant phase equilibria. The interactions that take place between the water molecules and the solutes of the various categories are presented. In particular, for ions and salts, the properties of such solutions are dealt with. In case of ions, their association on the one hand and their hydration on the other determine these properties. Finally, Chapter 5 includes the current practical uses, whether on a modest or on a full industrial scale. Conversion of biomass to fuel, gaseous or liquid, is one such use. SCW oxidation (SCWO) of pollutants and hazardous materials is another important use, the problems associated with which have not so far been completely resolved. Some other uses include organic synthesis, where SCW is both a reaction medium and a reactant, nanoparticle production of inorganic substances (mainly oxides), and as a neutron moderator in nuclear power reactors and at the same time as the coolant, providing the fluid for turbine operation. Geochemistry is another field where SCW plays a role, because deep strata in the earth s crust provide the high temperature and pressure to convert any water derived from hydrous minerals to SCW. This is then evolved in thermal vents, carrying along some minerals dissolved in it. Finally, some of the corrosion problems met with in applications of SCW are briefly dealt with. A vast amount of information is available on SCW and solutions therein; this book however provides those numerical data in tables that help the reader to appreciate the quantitative aspects of SCW and its properties. Some other tables include annotated examples of the uses of SCW, but on the whole, it is possible only to point out what various authors have studied, to summarize it, and as necessary to comment on this. This book includes references to which the readers interested in having in-depth knowledge of the topics may refer. It is hoped that the book will help understand the concept of supercritical water, its properties, and uses. YIZHAK MARCUS Jerusalem, 2011
10 LIST OF ACRONYMS AND SYMBOLS ACRONYMS EoS MC MD PVT SAFT SCD SCF SCW SCWG SCWO VLE Equation of states Monte Carlo computer simulation Molecular dynamics computer simulation Pressure volume temperature Statistical associated fluid theory Supercritical carbon dioxide Supercritical fluid Supercritical water Supercritical water gasification Supercritical water oxidation Vapor/liquid equilibrium SYMBOLS Symbol Description Units Universal constants e Unit electrical charge: C F Faraday s constant: C mol 1 k B Boltzmann s constant: JK 1 N A Avogadro s number: mol 1 R Gas constant: J K 1 mol 1 e 0 Permittivity of vacuum: C 2 J 1 m 1 Physical quantities A Helmholtz energy, molar kj mol 1 a Attractive parameter in EoS J 2 Pa 1 mol 2 B Virial coefficient m 3 xiii
11 xiv LIST OF ACRONYMS AND SYMBOLS Symbol Description Units b Scattering length nm b Covolume parameter in EoS m 3 Co Number of components C P Heat capacity at constant pressure, molar J K 1 mol 1 C V Heat capacity at constant volume, molar J K 1 mol 1 c Concentration, molar scale mol dm 3 D Diffusion coefficient m 2 s 1 Df Number of degrees of freedom d Interatomic distance nm E Energy, molar kj mol 1 e HB Energy of an H-bond kj mol 1 f Fugacity kpa f i Fraction of water molecules with i H-bonds G Gibbs energy, molar kj mol 1 g Kirkwood dipole orientation parameter g(r) Pair correlation function H Enthalpy, molar kj mol 1 h i hydration number, ionic I Ionic strength mol dm 3 I Intensity of scattered or absorbed radiation K Equilibrium constant dm 3 mol 1 KW O Octanol/water partition coefficient K W Ion product of water dm 6 mol 2 k Variable, function of diffraction angle m 1 k Rate constant s 1 L g Ostwald coefficient of gas solubility M Mass, molar kg mol 1 m Mass, molecular kg m Molality mol kg 1 N Number of components N Number of molecules or ions N co Coordination number n Refractive index (at specified frequency) hn HB i Average number of H-bonds per water molecule P Pressure MPa Ph Number of coexisting phases P i Internal pressure MPa p Vapor pressure kpa p (event) Probability of an event r Radial distance from a particle nm r i Radius, ionic nm S Entropy, molar J K 1 mol 1 S(k) Structure factor s Solubility mol dm 3
12 LIST OF ACRONYMS AND SYMBOLS xv Symbol Description Units T Temperature (absolute) K T 1 Spin-lattice NMR relaxation time s t Temperature C t i Transference number, ionic U Configurational energy of system, molar kj mol 1 u Sound velocity m s 1 u i Mobility, ionic m s 1 V 1 V Volume, molar m 3 v Specific volume m 3 kg 1 v Velocity, molecular m s 1 x Mole fraction of specified component or species Y Generalized thermodynamic function y Activity coefficient, molar scale Z Compressibility factor PV/RT Z Lattice parameter z Charge number, algebraic a Kamlet Taft H-bond donation ability index a Polarizability, molecular m 3 a p Expansibility, isobaric K 1 b Kamlet Taft H-bond acceptance ability index g Activity coefficient, molal scale d NMR chemical shift ppm d H Hildebrand solubility parameter MPa 1/2 e r Relative permittivity z Reciprocal of the friction coefficient Z Dynamic viscosity mpa s 1 y Angle between two dipoles or three atoms k S Compressibility, adiabatic GPa 1 k T Compressibility, isothermal GPa 1 L Conductivity, molar O 1 m 2 mol 1 l i Conductivity, ionic equivalent O 1 m 2 mol 1 l th Conductivity, thermal W K 1 m 1 m Dipole moment C m m Chemical potential kj mol 1 n Wave number cm 1 x Correlation length m p Kamlet Taft polarity/polarizability index r Density kg m 3 s Diameter, molecular nm t Relaxation or correlation time ps j Volume fraction w Number of H-bonds of any given water molecule o Frequency s 1 o Pitzer s acentric factor
13 xvi LIST OF ACRONYMS AND SYMBOLS SUBSCRIPTS AND SUPERSCRIPTS Pure substance or scaling parameter Standard state Infinite frequency Infinite dilution ass Association c Critical D Dielectric or Debye, or self-diffusion E Excess thermodynamic quantity f Formation (thermodynamic quantity) g Gas ig Ideal gas r Reduced, divided by the critical quantity V Vaporization W Water Saturation (VLE equilibrium) s
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