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Ammonia As a Refrigerant
1791 Tullie Circle, NE. Atlanta, Georgia 30329-2305, USA www.ashrae.org ASHRAE Position Document on Ammonia as a Refrigerant Approved by ASHRAE Board of Directors February 1, 2017 Expires February 1, 2020 ASHRAE S H A P I N G T O M O R R O W ’ S B U I L T E N V I R O N M E N T T O D A Y © 2017 ASHRAE (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE’s prior written permission. COMMITTEE ROSTER The ASHRAE Position Document on “Ammonia as a Refrigerant” was developed by the Society’s Refrigeration Committee. Position Document Committee formed on January 8, 2016 with Dave Rule as its chair. Dave Rule, Chair Georgi Kazachki IIAR Dayton Phoenix Group Alexandria, VA, USA Dayton, OH, USA Ray Cole Richard Royal Axiom Engineers, Inc. Walmart Monterey, CA, USA Bentonville, Arkansas, USA Dan Dettmers Greg Scrivener IRC, University of Wisconsin Cold Dynamics Madison, WI, USA Meadow Lake, SK, Canada Derek Hamilton Azane Inc. San Francisco, CA, USA Other contributors: M. Kent Anderson Caleb Nelson Consultant Azane, Inc. Bethesda, MD, USA Missoula, MT, USA Cognizant Committees The chairperson of Refrigerant Committee also served as ex-officio members: Karim Amrane REF Committee AHRI Bethesda, MD, USA i © 2017 ASHRAE (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE’s prior written permission. HISTORY of REVISION / REAFFIRMATION / WITHDRAWAL -
Preparing to Manufacture Hydrogen Peroxide
PREPARING TO MANUFACTURE HYDROGEN PEROXIDE Part of the Hydrogen Peroxide Propulsion Guide The early laboratory preparation of hydrogen peroxide was based on the technique that Thenard used during the initial preparation of hydrogen peroxide. In this technique, barium nitrate, purified by recrystallization, was decomposed by heating in air in a porcelain retort. The resulting oxide was further oxidized by heating in a stream of oxygen to a dull red heat. The barium peroxide which formed was then dampened, ground, and dissolved in hydrochloric acid (nitric acid was used in Thenard’s initial experiments). A slight excess of sulfuric acid was then added to precipitate barium sulfate and regenerate hydrochloric acid. The procedure of barium peroxide solution and sulfate precipitation was repeated several times in the same solution to increase the peroxide concentration (concentrations of up to 33 percent by weight hydrogen peroxide could be achieved in this manner). The concentrated solution containing water, hydrogen peroxide, and hydrochloric acid, along with accumulated impurities, was cooled with ice and saturated with barium peroxide; iron and manganese impurities in the solution were then precipitated out as phosphates. The hydrochloric acid was removed by the addition of silver sulfate and the sulfate ion was removed by the subsequent addition of barium oxide. Further concentration was accomplished by vacuum distillation until “no further density increase occurs.” Thenard reported that 100 w/o hydrogen peroxide (on the basis of density data and the measurement of the volume of oxygen released) could be obtained by this technique. The first record of commercial production of hydrogen peroxide appeared in the 1865 to 1875 period. -
Theoretical Study on the Molecular and Crystal Structures of Nitrogen Trifluoride and It’S Adduct with BF3
J. Chem. Sci. Vol. 127, No. 8, August 2015, pp. 1491–1496. c Indian Academy of Sciences. DOI 10.1007/s12039-015-0857-3 Theoretical study on the molecular and crystal structures of nitrogen trifluoride and it’s adduct with BF3 HONGCHEN DUa,b,c aSchool of Science, Zhejiang A & F University, Linan, 311300, China bZhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang A & F University, Lin’an, 311300, China cPresent address: Weifang University of Science and Technology, Jinguang Street 1299, Shouguang, 262700, China e-mail: [email protected]; [email protected] MS received 30 April 2014; revised 30 October 2014; accepted 27 January 2015 Abstract. The molecular and crystal structure of the adduct NF3·BF3 was studied computationally using density functional theory. It shows that the adduct exists in the form of a complex but is not ionic. The heats of formation in the gas and the condensed phase of the adduct are −1266.09 and −1276.37 kJ·mol−1, respectively, which indicates that it is stable under atmospheric conditions. The crystal form belongs to P 21/c space group. The calculated large band gap (Eg) of the crystal proves that it is stable. The conduction band (LUCO) is mainly contributed by the p orbital of N atom and the valence band (HOCO) from the p orbital of F atom. Keywords. Molecular; crystal; structure; property; theoretical study. 1. Introduction investigation even though there is limited information on the structure–property relationship, especially on the Molecular complexes containing boron trifluoride as a crystal structure of NF3 with BF3. -
Pharmacy and Poisons (Third and Fourth Schedule Amendment) Order 2017
Q UO N T FA R U T A F E BERMUDA PHARMACY AND POISONS (THIRD AND FOURTH SCHEDULE AMENDMENT) ORDER 2017 BR 111 / 2017 The Minister responsible for health, in exercise of the power conferred by section 48A(1) of the Pharmacy and Poisons Act 1979, makes the following Order: Citation 1 This Order may be cited as the Pharmacy and Poisons (Third and Fourth Schedule Amendment) Order 2017. Repeals and replaces the Third and Fourth Schedule of the Pharmacy and Poisons Act 1979 2 The Third and Fourth Schedules to the Pharmacy and Poisons Act 1979 are repealed and replaced with— “THIRD SCHEDULE (Sections 25(6); 27(1))) DRUGS OBTAINABLE ONLY ON PRESCRIPTION EXCEPT WHERE SPECIFIED IN THE FOURTH SCHEDULE (PART I AND PART II) Note: The following annotations used in this Schedule have the following meanings: md (maximum dose) i.e. the maximum quantity of the substance contained in the amount of a medicinal product which is recommended to be taken or administered at any one time. 1 PHARMACY AND POISONS (THIRD AND FOURTH SCHEDULE AMENDMENT) ORDER 2017 mdd (maximum daily dose) i.e. the maximum quantity of the substance that is contained in the amount of a medicinal product which is recommended to be taken or administered in any period of 24 hours. mg milligram ms (maximum strength) i.e. either or, if so specified, both of the following: (a) the maximum quantity of the substance by weight or volume that is contained in the dosage unit of a medicinal product; or (b) the maximum percentage of the substance contained in a medicinal product calculated in terms of w/w, w/v, v/w, or v/v, as appropriate. -
Ammonia in Drinking-Water
WHO/SDE/WSH/03.04/01 English only Ammonia in Drinking-water Background document for development of WHO Guidelines for Drinking-water Quality _______________________ Originally published in Guidelines for drinking-water quality, 2nd ed. Vol. 2. Health criteria and other supporting information. World Health Organization, Geneva, 1996. © World Health Organization 2003 All rights reserved. Publications of the World Health Organization can be obtained from Marketing and Dissemination, World Health Organization, 20 Avenue Appia, 1211 Geneva 27, Switzerland (tel: +41 22 791 2476; fax: +41 22 791 4857; email: [email protected]). Requests for permission to reproduce or translate WHO publications – whether for sale or for noncommercial distribution – should be addressed to Publications, at the above address (fax: +41 22 791 4806; email: [email protected]). The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the World Health Organization concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. The mention of specific companies or of certain manufacturers’ products does not imply that they are endorsed or recommended by the World Health Organization in preference to others of a similar nature that are not mentioned. Errors and omissions excepted, the names of proprietary products are distinguished by initial capital letters. The World Health Organization does not warrant that the information contained in this publication is complete and correct and shall not be liable for any damages incurred as a result of its use. -
Action of Ammonium Chloride Upon Silicates
Bulletin No. 207 Series E, Chemistry and Physics, 36 DEPARTMENT OF TEiE INTERIOR UNITED STATES GEOLOGICAL SURVEY CHARLES D. WALCOTT, DIRECTOR THE ACTION OF AMMONIUM CHLORIDE UPON SILICATES BY AND GKKOKG-IE Srj::ir, WASHINGTON GOVERNMEN.T PllINTING OFFICE 1902 CONTENTS. Page. Introductory statement......--..-..---.--.------.--.-..--.-.-----------. 7 Analcite-.....-.-.-.--.-.....-.--.'--------....--.-.--..._.-.---.-...---.--. 8 Leucite .....................'.................-....................^-..... 16 The constitution of analcite and leucite.........-..--.-..--...--.---------. 17 Pollucite---. ............................................................ 21 Natrolite--------------------------..-..-----------------.------ --------- 22 Scolecite ................,.:............-.....-.................--.--.... 24 Prehnite .....--.-............--.------------------------------ --------- 25 The trisilicic acids-.--.-.--..---..........-._-----...-.........-...----.- 26 Stilbite.............-..................-....-.-.-----...--.---.......... 29 Henlandite .......... .......................---.-..-.-..-...-----.--..--.. 81 Chabazite............................................................... 32 Thoinsonite...-.-.-..-...._.................---...-.-.-.----..-----..--.. 34 Lanmontite -.-.------.-..-------------.-..-.-..-.-------.-.-----........ 35 Pectolite ......:......... ......................................'.......;.., 36 Wollastonite ....'............................ ................:........... 39 Apophyllite. _.--._..._-....__.....:......___-------------....----..-...._ -
Environmental Protection Agency § 117.3
Environmental Protection Agency § 117.3 (4) Applicability date. This paragraph TABLE 117.3—REPORTABLE QUANTITIES OF (i) is applicable beginning on February HAZARDOUS SUBSTANCES DESIGNATED PUR- 6, 2020. SUANT TO SECTION 311 OF THE CLEAN (j) Process waste water means any WATER ACT—Continued water which, during manufacturing or Cat- RQ in pounds processing, comes into direct contact Material egory (kilograms) with or results from the production or use of any raw material, intermediate Ammonium benzoate ...................... D ...... 5,000 (2,270) Ammonium bicarbonate .................. D ...... 5,000 (2,270) product, finished product, byproduct, Ammonium bichromate ................... A ....... 10 (4.54) or waste product. Ammonium bifluoride ...................... B ....... 100 (45.4) Ammonium bisulfite ......................... D ...... 5,000 (2,270) [44 FR 50776, Aug. 29, 1979, as amended at 58 Ammonium carbamate .................... D ...... 5,000 (2,270) FR 45039, Aug. 25, 1993; 65 FR 30904, May 15, Ammonium carbonate ..................... D ...... 5,000 (2,270) 2000; 80 FR 37112, June 29, 2015; 83 FR 5208, Ammonium chloride ........................ D ...... 5,000 (2,270) Feb. 6, 2018] Ammonium chromate ...................... A ....... 10 (4.54) Ammonium citrate dibasic ............... D ...... 5,000 (2,270) Ammonium fluoborate ..................... D ...... 5,000 (2,270) § 117.2 Abbreviations. Ammonium fluoride ......................... B ....... 100 (45.4) NPDES equals National Pollutant Ammonium hydroxide ..................... C -
1. Hydrogen Forms Compounds with Most Non-Metallic Elements and with Some Metals
PMT 1. Hydrogen forms compounds with most non-metallic elements and with some metals. (a) Calculate the empirical formula of the compound used in the manufacture of artificial rubber which has the following composition by mass. Hydrogen 11.1% Carbon 88.9% (3) (b) The boiling temperatures of hydrogen chloride and hydrogen iodide are: Hydrogen chloride ±85ºC Hydrogen iodide ±35ºC Explain why hydrogen iodide has a higher boiling temperature than hydrogen chloride. ............................................................................................................................. ... ............................................................................................................................. ... ............................................................................................................................. ... (2) (c) Draw and explain the shapes of: (i) the PH3 molecule; .......................................................... ............................................................ ...................................................................................................................... (2) 1 PMT ± (ii) the AlH4 ion. ...................................................................................................................... ...................................................................................................................... (2) 3 (d) Calculate the number of molecules in 8.0 cm of gaseous phosphine, PH3, at room temperature and pressure. (The molar volume of -
The Strange Case of Dr. Petit and Mr. Dulong
The strange case of Dr. Petit and Mr. Dulong Roberto Piazza Dipartimento di Chimica, Materiali ed Ingegneria Chimica Politecnico di Milano, Piazza Leonardo da Vinci, 32 - 20133 Milano Abstract Petit (DP) limiting law for the (vibrational) specific heat was one of Boltzmann’s great achievements. The Dulong-Petit limiting law for the specific heats On the other hand, evidence of the crushing failure of solids, one of the first general results in thermo- of the DP law at low temperatures, besides giving dynamics, has provided Mendeleev with a powerful support to Nernst’s Third Law of thermodynamics, tool for devising the periodic table and gave an im- motivated Einstein to introduce quantum concepts portant support to Boltzmann’s statistical mechan- in condensed matter physics and Debye to develop a ics. Even its failure at low temperature, accounted consistent vibrational theory of the heat capacity of for by Einstein, paved the way to the the quantum solids [2]. Even today, the study of the anomalous mechanical theory of solids. These impressive con- behavior of the specific heat close to a quantum sequences are even more surprising if we bear in critical point has granted the DP law a “second mind that, when this law was announced, thermal wind” [3]. phenomena were still explained using Lavoisier’s The accomplishment of Dulong and Petit is even concept of caloric and Dalton’s atomic theory was more remarkable when framed within the histori- in its infancy. Recently, however, bitter criticisms cal and geographical context in which it was ob- charging Dulong and Petit of ‘data fabrication’ and tained. -
Nutritional Strategies to Managing Pork Market Disruptions Frequently Asked Questions from the Webinar
P a g e | 1 NUTRITIONAL STRATEGIES TO MANAGING PORK MARKET DISRUPTIONS FREQUENTLY ASKED QUESTIONS FROM THE WEBINAR May 1, 2020 VERSION 2 Authors: Dr. Laura Greiner: [email protected], Dr. John Patience: [email protected], Amanda Chipman: [email protected], Dr. Dan Andersen: [email protected], Dr. Brett Ramirez: [email protected], Colin Johnson: [email protected], David Stender: [email protected], Mark Storlie: [email protected], Russel Euken: [email protected], Matt Romoser: [email protected], Dr. Chris Rademacher: [email protected], Dr. Jason Ross: [email protected], Sherry Hoyer: [email protected]. Additional Contacts: https://www.extension.iastate.edu/ag/swine FIBER Q. What are my other options for high fiber ingredients besides DDGS? A. The cost of all ingredients, including high fiber ingredients, varies by location and over time. So, message #1 here is to always keep an eye on ingredient costs because they can change as conditions change. And what is economical in one location may be priced out of the market in another. But high fiber ingredient options with greater than 25% NDF include (typical NDF % in brackets): corn cobs (81), soybean hulls (59), safflower meal (56), brewers grains (49), sugar beet pulp (45), corn germ meal (44), alfalfa meal (42), sunflower meal (37), wheat middlings (35), sorghum DDGS (34), corn bran without solubles (33), wheat bran (32), dehulled sunflower meal (30), wheat shorts (29), rice bran (26), dehulled safflower meal (26). Q. Will the use of high fiber diets lead to the build-up of solids in the pit? A. Using an example of a 35% DDGS diet or 20% soy hulls diet, it generally depends on how you grind them. -
Disinfectant Concentrations, Contact Times, and Use Settings for Products Effective Against Coronavirus SARS-Cov-2
Disinfectant Concentrations, Contact Times, and Use Settings for Products Effective against Coronavirus SARS-CoV-2 This table provides disinfectant concentrations, contact times, and use settings for EPA's List N, which covers antimicrobial products effective against SARS-CoV-2 but does not specify disinfectant concentrations. Our list will help you ensure you're using an effective disinfectant at a sufficient concentration and contact time to kill SARS-CoV-2 in appropriate settings. This table accompanies ECRI's article "Disinfectant Concentrations, Contact Times, and Use Settings for EPA's List of Products Effective against Coronavirus SARS-CoV-2, the Cause of COVID-19," available at http://ly.ecri.org/epalist. It was last updated on June 2, 2021. The Last Updated column, below, refers to the date when ECRI last reviewed EPA’s information for the product listed. EPA Reg. Primary Registered Active Disinfectant Disinfectant Disinfectant Healthcare Institutional Home Last No. Product Name Concentration Contact Time Use Use Use Updated (by weight) (min) 10190-14 Penetone XF-7117 n-Alkyl (50% C14, 40% C12, 4.34% 10 No Yes No November 10% C16) dimethyl benzyl 2020 ammonium chloride Octyl decyl dimethyl 3.25% ammonium chloride Didecyl dimethyl ammonium 1.63% chloride Dioctyl dimethyl ammonium 1.63% chloride 10324-105 Maquat 128 PD n-Alkyl (60% C14, 30% C16, 4.50% 10 Yes Yes Yes November 5% C12, 5% C18) dimethyl 2020 benzyl ammonium chloride n-Alkyl (68% C12, 32% C14) 4.50% dimethyl ethylbenzyl ammonium chloride 10324-108 Maquat 256-MN n-Alkyl -
CFNP TAP Report for Urea January 2004 SUMMARY of TAP
CFNP TAP Report for Urea January 2004 SUMMARY OF TAP REVIEWERS’ ANALYSES1 Urea is being petitioned for use as an insect (fruit fly) attractant in sticky traps in order to prevent extensive damage to olive and fruit crops. Urea slowly and progressively breaks down to ammonia and carbon dioxide inside the sticky traps. Ammonia is a volatile compound that lures fruit flies into the sticky traps. The size and placement of the openings leading into the sticky traps are designed to favor the trapping of fruit flies with minimal trapping of other insects. Ammonium carbonate, a substance already approved for use as bait in insect traps, also breaks down to produce ammonia over an extended period of time. The petitioner is requesting that urea be permitted on the National List of synthetic substances allowed for use in organic crop production since its mode of action is similar to that of ammonium carbonate. All three reviewers concluded that urea, as petitioned, is a synthetic substance. Two of the reviewers recommended, without hesitation, that urea should be included on the National List. The other reviewer had concerns about allowing urea on the National List since it has not historically been allowed for use in organic crop production and since other acceptable substances are available for insect control. However, this reviewer also recommended that urea be allowed on the National List since it will only be used as an insect attractant in sticky traps. Synthetic or Non-synthetic? Allow without restrictions? Allow only with restrictions? (See reviewers’ comments for restrictions) Synthetic (3) Yes (3) Yes (0) Non-synthetic (0) No (0) No(0) IDENTIFICATION Common Name: Urea CAS Registry Number: 57-13-6 1 This Technical Advisory Panel (TAP) report was based upon the information available at the time this report was generated.