Chemical Engineering Vocabulary
Total Page：16
File Type：pdf, Size：1020Kb
Load more
Recommended publications
-
Neutron Stars
Chandra X-Ray Observatory X-Ray Astronomy Field Guide Neutron Stars Ordinary matter, or the stuff we and everything around us is made of, consists largely of empty space. Even a rock is mostly empty space. This is because matter is made of atoms. An atom is a cloud of electrons orbiting around a nucleus composed of protons and neutrons. The nucleus contains more than 99.9 percent of the mass of an atom, yet it has a diameter of only 1/100,000 that of the electron cloud. The electrons themselves take up little space, but the pattern of their orbit defines the size of the atom, which is therefore 99.9999999999999% Chandra Image of Vela Pulsar open space! (NASA/PSU/G.Pavlov et al. What we perceive as painfully solid when we bump against a rock is really a hurly-burly of electrons moving through empty space so fast that we can't see—or feel—the emptiness. What would matter look like if it weren't empty, if we could crush the electron cloud down to the size of the nucleus? Suppose we could generate a force strong enough to crush all the emptiness out of a rock roughly the size of a football stadium. The rock would be squeezed down to the size of a grain of sand and would still weigh 4 million tons! Such extreme forces occur in nature when the central part of a massive star collapses to form a neutron star. The atoms are crushed completely, and the electrons are jammed inside the protons to form a star composed almost entirely of neutrons. -
Characteristics of Chemical Equilibrium
Characteristics of Chemical Equilibrium Chapter 14: Chemical Equilibrium © 2008 Brooks/Cole 1 © 2008 Brooks/Cole 2 Equilibrium is Dynamic Equilibrium is Independent of Direction of Approach Reactants convert to products N2(g) + 3 H2(g) 2 NH3(g) a A + b B c C + d D Species do not stop forming OR being destroyed Rate of formation = rate of removal Concentrations are constant. © 2008 Brooks/Cole 3 © 2008 Brooks/Cole 4 Equilibrium and Catalysts The Equilibrium Constant For the 2-butene isomerization: H3C CH3 H3C H C=C C=C H H H CH3 At equilibrium: rate forward = rate in reverse An elementary reaction, so: kforward[cis] = kreverse[trans] © 2008 Brooks/Cole 5 © 2008 Brooks/Cole 6 1 The Equilibrium Constant The Equilibrium Constant At equilibrium the concentrations become constant. We had: kforward[cis] = kreverse[trans] kforward [trans] or = kreverse [cis] kforward [trans] Kc = = = 1.65 (at 500 K) kreverse [cis] “c” for concentration based © 2008 Brooks/Cole 7 © 2008 Brooks/Cole 8 The Equilibrium Constant The Equilibrium Constant For a general reaction: a A + b B c C + d D [NO]2 N2(g) + O2(g) 2 NO(g) Kc = Products raised to [N2] [O2] stoichiometric powers… k [C]c [D]d forward …divided by reactants Kc = = a b kreverse [A] [B] raised to their stoichiometric [SO ] 1 2 powers 8 S8(s) + O2(g) SO2(g) Kc = [O2] © 2008 Brooks/Cole 9 © 2008 Brooks/Cole 10 Equilibria Involving Pure Liquids and Solids Equilibria in Dilute Solutions [Solid] is constant throughout a reaction. density g / L • pure solid concentration = mol. -
Laboratory 1: Chemical Equilibrium 1
1 Laboratory 1: Chemical Equilibrium 1 Reading: Olmstead and Williams, Chemistry , Chapter 14 (all sections) Purpose: The shift in equilibrium position of a chemical reaction with applied stress is determined. Introduction Chemical Equilibrium No chemical reaction goes to completion. When a reaction stops, some amount of reactants remain. For example, although we write → ← 2 CO 2 (g) 2 CO (g) + O 2 (g) (1) as though it goes entirely to products, at 2000K only 2% of the CO 2 decomposes. A chemical reaction reaches equilibrium when the concentrations of the reactants and products no longer change with time. The position of equilibrium describes the relative amounts of reactants and products that remain at the end of a chemical reaction. The position of equilibrium for reaction (1) is said to lie with the reactants, or to the left, because at equilibrium very little of the carbon dioxide has reacted. On the other hand, in the reaction → ← H2 (g) + ½ O2 (g) H2O (g) (2) the equilibrium position lies very far to the right since only very small amounts of H 2 and O 2 remain after the reaction reaches equilibrium. Since chemists often wish to maximize the yield of a reaction, it is vital to determine how to control the position of the equilibrium. The equilibrium position of a reaction may shift if an external stress is applied. The stress may be in the form of a change in temperature, pressure, or the concentration of one of the reactants or products. For example, consider a flask with an equilibrium mixture of CO 2, CO, and O 2, as in reaction (1). -
Production of Cyclohexane Through Catalytic Hydrogenation of Benzene
Production of Cyclohexane through Catalytic Hydrogenation of Benzene Background Cyclohexane is industrially produced from Benzene as it is not a naturally available resource. Cyclohexane undergoes oxidation reactions yielding Cyclohexanone and Cyclohexanol which are precursors for the production of Adipic acid and Caprolactum. Caprolactum is the raw material used for producing polymer Nylon-6. Benzene reacts with a mixture of hydrogen and methane in contact with a Nickel based catalyst producing Cyclohexane. The conversion of this vapour phase reaction is almost 99%. Reaction involved: Benzene + Hydrogen Cyclohexane (Vapour Phase) Reactor Used: Catalytic Packed Bed Conversion Reactor Reactor conditions: Outlet Temperature = 497 K, Pressure Drop = 1.02 atm Catalyst Used: Nickel Based Process Description Fresh benzene (370 kmol/h) and excess hydrogen (1470 kmol/h) is preheated to a temperature of 422 K and sent to a packed bed reactor. A vapour phase reaction occurs in the reactor at 497 K which converts benzene to cyclohexane through catalytic hydrogenation of benzene. The conversion of this reaction is about 99%. The reactor products are cooled to 370 K and sent through a pressure reduction valve which reduces the pressure of the stream from 30 atm to 24 atm. A two stage separator separates the product cyclohexane from unreacted hydrogen and methane- first at a high pressure (24 atm) and then at a lower pressure (3 atm). The unreacted hydrogen-methane mixture is recovered from the top of the flash column and is sent to a splitter having a splittling ratio of 9:1. The smaller stream is sent as a recycle stream and mixes with fresh hydrogen, while the rest is drawn out as fuel gas for incinerators. -
(Oxy)Hydroxide Electrocatalysts for Water Oxidation Bryan R
www.acsami.org Research Article Effect of Selenium Content on Nickel Sulfoselenide-Derived Nickel (Oxy)hydroxide Electrocatalysts for Water Oxidation Bryan R. Wygant, Anna H. Poterek, James N. Burrow, and C. Buddie Mullins* Cite This: ACS Appl. Mater. Interfaces 2020, 12, 20366−20375 Read Online ACCESS Metrics & More Article Recommendations *sı Supporting Information ABSTRACT: An efficient and inexpensive electrocatalyst for the oxygen evolution reaction (OER) must be found in order to improve the viability of hydrogen fuel production via water electrolysis. Recent work has indicated that nickel chalcogenide materials show promise as electrocatalysts for this reaction and that their performance can be further enhanced with the generation of ternary, bimetallic chalcogenides (i.e., Ni1−aMaX2); however, relatively few studies have investigated ternary chalcogenides created through the addition of a second chalcogen (i.e., NiX2−aYa). To address this, we fi studied a series of Se-modi ed Ni3S2 composites for use as OER electrocatalysts in alkaline solution. We found that the addition of Se results in the creation of Ni3S2/NiSe composites composed of cross-doped metal chalcogenides and show that the addition of 10% Se reduces the overpotential required to reach a current density of 10 mA/cm2 by 40 mV versus a pure nickel sulfide material. Chemical analysis of the composites’ surfaces shows a reduction in the amount of nickel oxide species with Se incorporation, which is supported by transmission electron microscopy; this reduction is correlated with a decrease in the OER overpotentials measured for these samples. Together, our results suggest that the incorporation of Se into Ni3S2 creates a more conductive material with a less-oxidized surface that is more electrocatalytically active and resistant to further oxidation. -
Thermodynamic and Kinetic Investigation of a Chemical Reaction-Based Miniature Heat Pump Scott M
Purdue University Purdue e-Pubs CTRC Research Publications Cooling Technologies Research Center 2012 Thermodynamic and Kinetic Investigation of a Chemical Reaction-Based Miniature Heat Pump Scott M. Flueckiger Purdue University Fabien Volle Laboratoire des Sciences des Procédés et des Matériaux S V. Garimella Purdue University, [email protected] Rajiv K. Mongia Intel Corporation Follow this and additional works at: http://docs.lib.purdue.edu/coolingpubs Flueckiger, Scott M.; Volle, Fabien; Garimella, S V.; and Mongia, Rajiv K., "Thermodynamic and Kinetic Investigation of a Chemical Reaction-Based Miniature Heat Pump" (2012). CTRC Research Publications. Paper 182. http://dx.doi.org/http://dx.doi.org/10.1016/j.enconman.2012.04.015 This document has been made available through Purdue e-Pubs, a service of the Purdue University Libraries. Please contact [email protected] for additional information. Thermodynamic and Kinetic Investigation of a Chemical Reaction-Based Miniature Heat Pump* Scott M. Flueckiger1, Fabien Volle2, Suresh V. Garimella1**, Rajiv K. Mongia3 1 Cooling Technologies Research Center, an NSF I/UCRC School of Mechanical Engineering and Birck Nanotechnology Center 585 Purdue Mall, Purdue University West Lafayette, Indiana 47907-2088 USA 2 Laboratoire des Sciences des Procédés et des Matériaux (LSPM, UPR 3407 CNRS), Université Paris XIII, 99 avenue J. B. Clément, 93430 Villetaneuse, France 3 Intel Corporation Santa Clara, California 95054 USA * Submitted for publication in Energy Conversion and Management ** Author to who correspondence should be addressed: (765) 494-5621, [email protected] Abstract Representative reversible endothermic chemical reactions (paraldehyde depolymerization and 2-proponal dehydrogenation) are theoretically assessed for their use in a chemical heat pump design for compact thermal management applications. -
Chemical Process Modeling in Modelica
Chemical Process Modeling in Modelica Ali Baharev Arnold Neumaier Fakultät für Mathematik, Universität Wien Nordbergstraße 15, A-1090 Wien, Austria Abstract model creation involves only high-level operations on a GUI; low-level coding is not required. This is the Chemical process models are highly structured. Infor- desired way of input. Not surprisingly, this is also mation on how the hierarchical components are con- how it is implemented in commercial chemical process nected helps to solve the model efficiently. Our ulti- simulators such as Aspen PlusR , Aspen HYSYSR or mate goal is to develop structure-driven optimization CHEMCAD R . methods for solving nonlinear programming problems Nonlinear system of equations are generally solved (NLP). The structural information retrieved from the using optimization techniques. AMPL (FOURER et al. JModelica environment will play an important role in [12]) is the de facto standard for model representation the development of our novel optimization methods. and exchange in the optimization community. Many Foundations of a Modelica library for general-purpose solvers for solving nonlinear programming (NLP) chemical process modeling have been built. Multi- problems are interfaced with the AMPL environment. ple steady-states in ideal two-product distillation were We are aiming to create a ‘Modelica to AMPL’ con- computed as a proof of concept. The Modelica source verter. One could use the Modelica toolchain to create code is available at the project homepage. The issues the models conveniently on a GUI. After exporting the encountered during modeling may be valuable to the Modelica model in AMPL format, the already existing Modelica language designers. software environments (solvers with AMPL interface, Keywords: separation, distillation column, tearing AMPL scripts) can be used. -
The Role of Nanotechnology in Chemical Substitution
EUROPEAN PARLIAMENT Scientific Technology Options Assessment S T O A The role of Nanotechnology in Chemical Substitution STUDY IPOL/A/STOA/ST/2006-029 PE 383.212 This project was commissioned by STOA under Framework Contract IP/A/STOA/FWC/2005-28). The associated workshop, "The Role of Nanotechnology in Chemical Substitution" was organised by the European Parliament in Brussels on 13 September 2006. Only published in English. Authors: ETAG European Technology Assessment Group Institute for Technology Assessment and Systems Analysis (ITAS), Karlsruhe Danish Board of Technology (DBT), Copenhagen Flemish Institute for Science and Technology Assessment (viWTA), Brussels Parliamentary Office of Science and Technology (POST), London Rathenau Institute, The Hague Dr. Ulrich Fiedeler, ITAS E-mail: [email protected] Administrator: Mr. Miklos Györffi Policy Department A: Economic and Scientific Policy DG Internal Policies European Parliament Rue Wiertz 60 - ATR 00K076 B-1047 Brussels Tel: +32 (0)2 283 25 05 Fax: +32 (0)2 284 49 84 E-mail: [email protected] Manuscript completed in April 2007. The opinions expressed in this document do not necessarily represent the official position of the European Parliament. Reproduction and translation for non-commercial purposes are authorised provided the source is acknowledged and the publisher is given prior notice and receives a copy. E-mail: poldep- [email protected]. IP/A/STOA/ST/2006-029 PE 383.212 TABLE OF CONTENTS 1 EXECUTIVE SUMMARY..............................................................................................................ii -
Chemical Engineering Curriculum
CHEMICAL ENGINEERING CURRICULUM Fall Term Spring Term First Year EGGG 101 Introduction to Engineering (FYE) 2 CHEG 112 Introduction to Chemical Engineering 3 CHEM 111 General Chemistry 3 CHEM 112 General Chemistry 3 MATH 242 Analytic Geometry & Calculus B 4 MATH 243 Analytic Geometry & Calculus C 4 CISC 106 General Computer Science for Engineers 3 PHYS 207 Fundamentals of Physics I 4 ENGL 110 Critical Reading and Writing 3 Breadth Requirement Elective 1 3 15 17 Second Year CHEG 231 Chemical Engineering Thermodynamics 3 CHEG 325 Chemical Engineering Thermodynamics 3 CHEM 220 Quantitative Analysis 3 CHEG 304 Random Variability in Chemical Processes 3 CHEM 221 Quantitative Analysis Laboratory 1 CHEM 444 Physical Chemistry 3 PHYS 208 Fundamentals of Physics II 4 CHEM 445 Physical Chemistry Laboratory ( a ) 0/1 MSEG 302 Materials Science for Engineers 3 MATH 305 Applied Math for Chemical Engineering 3 Breadth Requirement Elective 2 3 Breadth Requirement Elective 3 3 17 15/16 Third Year CHEG 332 Chemical Engineering Kinetics 3 CHEG 342 Heat and Mass Transfer 3 CHEG 341 Fluid Mechanics 3 CHEG 345 Chemical Engineering Laboratory I 3 CHEM 331 Organic Chemistry I 3 CHEM 332 Organic Chemistry ( b ) or 3 CHEM 333 Organic Chemistry Laboratory 1/2 CHEM 527 Introduction to Biochemistry Technical Elective 1 3 Breadth Requirement Elective 4 3 Technical Elective 2 3 CHEG Elective 1 3 16/17 15 Fourth Year CHEG 431 Chemical Process Design 1 3 CHEG 432 Chemical Process Design 2 (DLE) 3 CHEG 401 Chemical Process Dynamics and Control 3 CHEG Elective 3 3 CHEG 445 Chemical Engineering Laboratory II 3 Technical Elective 3 3 CHEG Elective 2 3 Technical Elective 4 or CHEG Elective 4 3 Breadth Requirement Elective 5 3 Breadth Requirement Elective 6 3 15 15 Total Credit Hours 126 ( a ) If CHEM 333 is taken for two credits, CHEM 445 is not required. -
Appendix F. Glossary
Appendix F. Glossary 2DEG 2-dimensional electron gas A/D Analog to digital AAAR American Association for Aerosol Research ADC Analog-digital converter AEM Analytical electron microscopy AFM Atomic force microscope/microscopy AFOSR Air Force Office of Scientific Research AIST (Japan) Agency of Industrial Science and Technology AIST (Japan, MITI) Agency of Industrial Science and Technology AMLCD Active matrix liquid crystal display AMM Amorphous microporous mixed (oxides) AMO Atomic, molecular, and optical AMR Anisotropic magnetoresistance ARO (U.S.) Army Research Office ARPES Angle-resolved photoelectron spectroscopy ASET (Japan) Association of Super-Advanced Electronics Technologies ASTC Australia Science and Technology Council ATP (Japan) Angstrom Technology Partnership ATP Adenosine triphosphate B Magnetic flux density B/H loop Closed figure showing B (magnetic flux density) compared to H (magnetic field strength) in a magnetizable material—also called hysteresis loop bcc Body-centered cubic BMBF (Germany) Ministry of Education, Science, Research, and Technology (formerly called BMFT) BOD-FF Bond-order-dependent force field BRITE/EURAM Basic Research of Industrial Technologies for Europe, European Research on Advanced Materials program CAD Computer-assisted design CAIBE Chemically assisted ion beam etching CBE Chemical beam epitaxy 327 328 Appendix F. Glossary CBED Convergent beam electron diffraction cermet Ceramic/metal composite CIP Cold isostatic press CMOS Complementary metal-oxide semiconductor CMP Chemical mechanical polishing -
The Influence of Sodium Hydroxide Concentration on the Phase, Morphology and Agglomeration of Cobalt Oxide Nanoparticles and Application As Fenton Catalyst
Digest Journal of Nanomaterials and Biostructures Vol.14, No.4, October-December 2019, p. 1131-1137 THE INFLUENCE OF SODIUM HYDROXIDE CONCENTRATION ON THE PHASE, MORPHOLOGY AND AGGLOMERATION OF COBALT OXIDE NANOPARTICLES AND APPLICATION AS FENTON CATALYST E. L. VILJOENa,*, P. M. THABEDEa, M. J. MOLOTOa, K. P. MUBIAYIb, B. W. DIKIZAa aDepartment of Chemistry, Vaal University of Technology Private, Bag X021, Vanderbijlpark 1900, South Africa bSchool of Chemistry, University of the Witwatersrand, 1 Jan Smuts Avenue, Braamfontein Johannesburg 2000, South Africa The concentration of NaOH was varied from 0.2 M to 0.7 M during the preparation of the cobalt oxide/cobalt oxide hydroxide nanoparticles by precipitation and air oxidation. Cubic shaped and less well defined Co3O4 nanoparticles formed at 0.2 M NaOH. An increase in the NaOH concentration increased the number of well-defined cubic shaped nanoparticles. Agglomerated CoO(OH) particles with different shapes formed at the highest NaOH concentration. The cubic shaped Co3O4 nanoparticles were subsequently used as catalyst for the Fenton degradation of methylene blue and it was found that the least agglomerated nanoparticles were the most catalytically active. (Received June 25, 2019; Accepted December 6, 2019) Keywords: Cobalt oxide, Nanoparticles, Precipitation, pH, Fenton reaction 1. Introduction Controlling the size and the shape of nanoparticles using simple, inexpensive precipitation methods without sophisticated capping molecules, remains a challenge. Literature has indicated that the concentration of the base (pH) is an important parameter to control the size, shape and phase of metal oxide nanoparticles. Obodo et al.[1] used chemical bath deposition at atmospheric pressure and 70 °C to precipitate Co3O4 crystallites on a glass substrate and they showed that the crystallite sizes were larger at a higher pH of 12 in comparison to when a pH of 10 was used. -
TEK 8.5C: Periodic Table
Name: Teacher: Pd. Date: TEK 8.5C: Periodic Table TEK 8.5C: Interpret the arrangement of the Periodic Table, including groups and periods, to explain how properties are used to classify elements. Elements and the Periodic Table An element is a substance that cannot be separated into simpler substances by physical or chemical means. An element is already in its simplest form. The smallest piece of an element that still has the properties of that element is called an atom. An element is a pure substance, containing only one kind of atom. The Periodic Table of Elements is a list of all the elements that have been discovered and named, with each element listed in its own element square. Elements are represented on the Periodic Table by a one or two letter symbol, and its name, atomic number and atomic mass. The Periodic Table & Atomic Structure The elements are listed on the Periodic Table in atomic number order, starting at the upper left corner and then moving from the left to right and top to bottom, just as the words of a paragraph are read. The element’s atomic number is based on the number of protons in each atom of that element. In electrically neutral atoms, the atomic number also represents the number of electrons in each atom of that element. For example, the atomic number for neon (Ne) is 10, which means that each atom of neon has 10 protons and 10 electrons. Magnesium (Mg) has an atomic number of 12, which means it has 12 protons and 12 electrons.