Utilización del CO2 como co-solvente para la producción de biodiesel con gases densos

Utilización del CO2 como co-solvente para la producción de biodiesel con gases densos
Author: Sheila Adell Barberán
Publisher:
Total Pages:
Release: 2012
Genre:
ISBN:

Este proyecto investiga la obtención de biodiesel mediante trans-esterificación con etanol en continuo utilizando fluidos supercríticos con co-solvente (CO2). Se pretende encontrar las condiciones de operación y determinar las velocidades de reacción y conversiones a esteres etílicos para compararlo con el proceso convencional. Actualmente, el biodiesel se ha convertido en una de las alternativas más prometedoras para solucionar las desventajas que presentan los combustibles fósiles y es por ello que se encuentra en continua investigación. Aquí, se va a llevar a cabo un proceso basado en reacciones de transesterificación con catálisis sólida ácida, con el fin de competir con los altos tiempos de reacción que tiene el proceso convencional y además, obtener mayor porcentaje de esteres etílicos reduciendo los procesos de purificación. Para ello es necesario realizar un primer estudio termodinámico que permita determinar el punto crítico de la mezcla (aceite-alcohol-CO2) para diferentes composiciones. Esto permite conocer las condiciones de operación del proceso que aseguran estar trabajando en condiciones supercríticas, escoger la composición de mezcla apropiada (condiciones críticas menos severas) y elegir un catalizador adecuado (que pueda soportar dichas condiciones). Una vez conocidas las condiciones de operación, se lleva a cabo un diseño de experimentos, del cual se obtiene la cinética de la reacción de transesterificación. Se discuten las condiciones obtenidas comparándolas con el proceso convencional.

The Global Carbon Cycle and Climate Change

The Global Carbon Cycle and Climate Change
Author: David E. Reichle
Publisher: Elsevier
Total Pages: 390
Release: 2019-11-12
Genre: Science
ISBN: 0128217677

The Global Carbon Cycle and Climate Change examines the global carbon cycle and the energy balance of the biosphere, following carbon and energy through increasingly complex levels of metabolism from cells to ecosystems. Utilizing scientific explanations, analyses of ecosystem functions, extensive references, and cutting-edge examples of energy flow in ecosystems, it is an essential resource to aid in understanding the scientific basis of the role played by ecological systems in climate change. This book addresses the need to understand the global carbon cycle and the interrelationships among the disciplines of biology, chemistry, and physics in a holistic perspective. The Global Carbon Cycle and Climate Change is a compendium of easily accessible, technical information that provides a clear understanding of energy flow, ecosystem dynamics, the biosphere, and climate change. "Dr. Reichle brings over four decades of research on the structure and function of forest ecosystems to bear on the existential issue of our time, climate change. Using a comprehensive review of carbon biogeochemistry as scaled from the physiology of organisms to landscape processes, his analysis provides an integrated discussion of how diverse processes at varying time and spatial scales function. The work speaks to several audiences. Too often students study their courses in a vacuum without necessarily understanding the relationships that transcend from the cellular process, to organism, to biosphere levels and exist in a dynamic atmosphere with its own processes, and spatial dimensions. This book provides the template whereupon students can be guided to see how the pieces fit together. The book is self-contained but lends itself to be amplified upon by a student or professor. The same intellectual quest would also apply for the lay reader who seeks a broad understanding." --W.F. Harris - Provides clear explanations, examples, and data for understanding fossil fuel emissions affecting atmospheric CO2 levels and climate change, and the role played by ecosystems in the global cycle of energy and carbon - Presents a comprehensive, factually based synthesis of the global cycle of carbon in the biosphere and the underlying scientific bases - Includes clear illustrations of environmental processes

Soil and Sediment Remediation

Soil and Sediment Remediation
Author: Piet Lens
Publisher: IWA Publishing
Total Pages: 545
Release: 2005-09-30
Genre: Science
ISBN: 1843391007

Soil and Sediment Remediation discusses in detail a whole set of remediative technologies currently available to minimise their impact. Technologies for the treatment of soils and sediments in-situ (landfarming, bioscreens, bioventing, nutrient injection, phytoremediation) and ex-situ (landfarming, bio-heap treatment, soil suspension reactor) will be discussed. The microbiological, process technological and socio-economical aspects of these technologies will be addressed. Special attention will be given to novel biotechnological processes that utilise sulfur cycle conversions, e.g. sulfur and heavy metal removal from soils. Also the potential of phytoremediation will be highlighted. In addition, treatment schemes for the clean-up of polluted megasites, e.g. harbours and Manufactured Gaswork Plants (MGP), will be elaborated. The aim of Soil and Sediment Remediation is to introduce the reader in: the biogeochemical characteristics of soil and sediments- new techniques to study soil/sediment processes (molecular probes, microelectrodes, NMR) clean up technologies for soils polluted with organic (PAH, NAPL, solvents) or inorganic (heavy metals) pollutants- preventative and remediative strategies and technologies available in environmental engineering novel process applications and bioreactor designs for bioremediation the impact of soil pollution on society and its economic importance.

Banana: Genomics and Transgenic Approaches for Genetic Improvement

Banana: Genomics and Transgenic Approaches for Genetic Improvement
Author: Sukhada Mohandas
Publisher: Springer
Total Pages: 345
Release: 2016-09-08
Genre: Science
ISBN: 9811015856

Bananas and plantains are among the most important food and cash crops in the world. They are cultivated in more than 135 countries, across the tropics and subtropics, with an annual global production of ca. 130 million metric tonnes. Though bananas are one of the most important components of food security in many developing countries, banana production is threatened by both abiotic and biotic stresses. These include a wide range of diseases and pests, such as bunchy top virus, burrowing nematodes, black Sigatoka or black leaf streak, Fusarium wilt, etc. In recent years, considerable progress has been made and several biotechnological and genomic tools have been employed to help understand and unravel the mysterious banana genome. Molecular and genomic studies have helped to decipher the Musa genome and its evolution. Genetic linkage map and whole genome sequencing of both Musa acuminata and Musa balbisiana (progenitors of cultivated banana) have completely changed the way of thinking and the approach on banana crop improvement. Whole-genome sequencing has helped to improve the selection of quantitative traits such as yield, as well as the selection of optimal parents for developing required hybrids in breeding programs. Gene isolation and the analysis of mutants have helped in the characterization of genes of agronomic value and the associated regulatory sequences. With the advent of molecular markers and new statistical tools, it is now possible to measure the diversity, identify genes and useful alleles linked to important agronomic traits. Further these alleles can be incorporated into cultivars through marker assisted selection or through transgenic approach. Transgenic approaches are potential tools for direct transfer of these genes into popular cultivars, which are generally not amenable for conventional breeding techniques, in specific with crops such as bananas which are sterile, triploid and heterozygous thereby making it difficult to reconstruct the recurrent genotypes in banana. Transgenic techniques thus have helped overcome the difficulty of working with sterile, triploid banana crop. In the last five years, enormous amount of new information and techniques have been generated for banana. A comprehensive book entitled “Banana: Genomics and Transgenic Approaches for Genetic improvement” on banana genomics, latest transgenic technologies and tools available for improved crop development in banana will address all these requirements.

Environmental Transport Processes

Environmental Transport Processes
Author: Bruce E. Logan
Publisher: John Wiley & Sons
Total Pages: 493
Release: 2012-03-20
Genre: Science
ISBN: 1118230078

A unique approach to the challenges of complex environmental systems Environmental Transport Processes, Second Edition provides much-needed guidance on mass transfer principles in environmental engineering. It focuses on working with uncontrolled conditions involving biological and physical systems, offering examples from diverse fields, including mass transport, kinetics, wastewater treatment, and unit processes. This new edition is fully revised and updated, incorporating modern approaches and practice problems at the end of chapters, making the Second Edition more concise, accessible, and easy to use. The book discusses the fundamentals of transport processes occurring in natural environments, with special emphasis on working at the biological physical interface. It considers transport and kinetics in terms of systems that involve microorganisms, along with in-depth coverage of particles, size spectra, and calculations for particles that can be considered either spheres or fractals. The book's treatment of particles as fractals is especially unique and the Second Edition includes a new section on exoelectrogenic biofilms. It also addresses dispersion in natural and engineered systems unlike any other book on the subject. Readers will learn to tackle with confidence complex environmental systems and make transport calculations in heterogeneous environments with mixtures of chemicals.

Cities of Tomorrow

Cities of Tomorrow
Author: Peter Hall
Publisher: Wiley-Blackwell
Total Pages: 502
Release: 1997-02-18
Genre: Social Science
ISBN: 9780631199434

Cities of Tomorrow is a critical history of planning in theory and practice in the twentieth century, as well as of the social and economic problems and opportunities that gave rise to it. Trenchant, perceptive, global in coverage, this book is an unrivalled account of its crucial subject. The third edition of Cities of Tomorrow is comprehensively revised to take account of abundant new literature published since its original appearance, and to view the 1990s in historical perspective. This is the definitive edition, reviewing the development of the modern planning movement over the entire span of the twentieth century.

Handbook of Solvents

Handbook of Solvents
Author: George Wypych
Publisher: ChemTec Publishing
Total Pages: 1446
Release: 2001
Genre: Science
ISBN: 1895198240

A comprehensive, extensive textual analysis of the principles of solvent selection and use, the handbook is intended to help formulators select ideal solvents, safety coordinators to protect workers, and legislators and inspectors to define and implement technically correct public safeguards for use, handling, and disposal.

Pollution Assessment for Sustainable Practices in Applied Sciences and Engineering

Pollution Assessment for Sustainable Practices in Applied Sciences and Engineering
Author: Abdel-Mohsen O. Mohamed
Publisher: Butterworth-Heinemann
Total Pages: 1170
Release: 2020-11-10
Genre: Technology & Engineering
ISBN: 0128095822

Pollution Assessment for Sustainable Practices in Applied Sciences and Engineering provides an integrated reference for academics and professionals working on land, air, and water pollution. The protocols discussed and the extensive number of case studies help environmental engineers to quickly identify the correct process for projects under study. The book is divided into four parts; each of the first three covers a separate environment: Geosphere, Atmosphere, and Hydrosphere. The first part covers ground assessment, contamination, geo-statistics, remote sensing, GIS, risk assessment and management, and environmental impact assessment. The second part covers atmospheric assessment topics, including the dynamics of contaminant transport, impacts of global warming, indoor and outdoor techniques and practice. The third part is dedicated to the hydrosphere including both the marine and fresh water environments. Finally, part four examines emerging issues in pollution assessment, from nanomaterials to artificial intelligence. There are a wide variety of case studies in the book to help bridge the gap between concept and practice. Environmental Engineers will benefit from the integrated approach to pollution assessment across multiple spheres. Practicing engineers and students will also benefit from the case studies, which bring the practice side by side with fundamental concepts. Provides a comprehensive overview of pollution assessment Covers land, underground, water and air pollution Includes outdoor and indoor pollution assessment Presents case studies that help bridge the gap between concepts and practice

Fundamentals of Thermal and Nuclear Power Generation

Fundamentals of Thermal and Nuclear Power Generation
Author: Yasuo Koizumi
Publisher: Elsevier
Total Pages: 320
Release: 2021-02-12
Genre: Business & Economics
ISBN: 0128207337

Fundamentals of Thermal and Nuclear Power Generation is the first volume in the JSME Series in Thermal and Nuclear Power Generation. The first part of this volume provides a thorough and complete reference on the history of thermal and nuclear power generation, which has informed and sculpted today's industry. It prepares readers for subsequent publications in the series that address more advanced topics and will particularly benefit early career researchers and those approaching the industry from an alternative discipline. Modern thermal and nuclear power generation systems and technologies are then explored, including clear analysis on the fundamentals of thermodynamics, hydrodynamics, thermal engineering, combustion engineering, and nuclear physics. The impact of these technologies on society is considered throughout, as well as supply issues, accident risk analysis, and important emission and sustainability considerations. This book is an invaluable resource for researchers and professional engineers in nuclear and thermal energy engineering, and postgraduate and undergraduate students in power generation, especially nuclear and thermal. Written by experts from the leaders and pioneers in thermal and nuclear power engineering research at the Japanese Society of Mechanical Engineers and draws upon their combined wealth of knowledge and experience Includes real examples and case studies from Japan and other key regions such as the United States and Europe to provide a deeper learning opportunity Considers societal impact and sustainability concerns and goals throughout

Handbook of Green Building Design and Construction

Handbook of Green Building Design and Construction
Author: Sam Kubba
Publisher: Butterworth-Heinemann
Total Pages: 1066
Release: 2016-10-15
Genre: Architecture
ISBN: 0128104430

Handbook of Green Building Design and Construction: LEED, BREEAM, and Green Globes, Second Edition directly addresses the needs of building professionals interested in the evolving principles, strategies, and concepts of green/sustainable design. Written in an easy to understand style, the book is updated to reflect new standards to LEED. In addition, readers will find sections that cover the new standards to BREEAM that involve new construction Infrastructure, data centers, warehouses, and existing buildings. - Provides vital information and penetrating insights into three of the top Green Building Codes and Standards applied Internationally - Includes the latest updates for complying with LEED v4 Practices and BREEAM - Presents case studies that draws on over 35 years of personal experience from across the world