Definition: Non-Precursor Organic Compounds
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The Evolutionary Story Ahead of Biochemistry
Downloaded from http://cshperspectives.cshlp.org/ on September 24, 2021 - Published by Cold Spring Harbor Laboratory Press The Organic Composition of Carbonaceous Meteorites: The Evolutionary Story Ahead of Biochemistry Sandra Pizzarello1 and Everett Shock1,2 1Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604 2School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85287-1404 Correspondence: [email protected] Carbon-containing meteorites provide a natural sample of the extraterrestrial organic chemistry that occurred in the solar system ahead of life’s origin on the Earth. Analyses of 40 years have shown the organic content of these meteorites to be materials as diverse as kerogen-like macromolecules and simpler soluble compounds such as amino acids and polyols. Many meteoritic molecules have identical counterpart in the biosphere and, in a primitive group of meteorites, represent the majority of their carbon. Most of the compounds in meteorites have isotopic compositions that date their formation to presolar environments and reveal a long and active cosmochemical evolution of the biogenic elements. Whether this evolution resumed on the Earth to foster biogenesis after exogenous deliveryof meteoritic and cometary materials is not known, yet, the selective abundance of biomolecule precur- sors evident in some cosmic environments and the unique L-asymmetry of some meteoritic amino acids are suggestive of their possible contribution to terrestrial molecular evolution. INTRODUCTION that fostered biogenesis. These conditions are entirely unknown because geological and Why Meteorites are Part of the Discourse biological processes of over four billion years about the Origin of Life have long eradicated any traces of early Earth’s he studies of meteorites have long been part chemistry. -
Kinetic Modeling and Mechanistic Investigations of Transesterification of Propylene Carbonate with Methanol Over Fe-Mn Double Metal Cyanide Catalyst
Reaction Chemistry & Engineering Kinetic Modeling and Mechanistic Investigations of Transesterification of Propylene Carbonate with Methanol over Fe-Mn Double Metal Cyanide Catalyst Journal: Reaction Chemistry & Engineering Manuscript ID RE-ART-09-2019-000372.R1 Article Type: Paper Date Submitted by the 21-Oct-2019 Author: Complete List of Authors: Song, Ziwei; Yanshan University, Subramaniam, Bala; University of Kansas, Center for Environmentally Beneficial Catalysis Chaudhari, Raghunath; University of Kansas, Chemical & Petroleum Engineering Page 1 of 23 Reaction Chemistry & Engineering Kinetic Modeling and Mechanistic Investigations of Transesterification of Propylene Carbonate with Methanol over Fe-Mn Double Metal Cyanide Catalyst Ziwei Song, a,b,c Bala Subramaniam, a,b and Raghunath V. Chaudhari* a,b aCenter for Environmentally Beneficial Catalysis, University of Kansas, 1501 Wakarusa Dr. Lawrence, KS 66047, United States bDepartment of Chemical & Petroleum Engineering, University of Kansas, 1503 W 15th St. Lawrence, KS 66045, United States cDepartment of Chemical Engineering, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China *Corresponding author: [email protected] KEYWORDS: double metal cyanide, transesterification, dimethyl carbonate, microkinetic modeling 1 Reaction Chemistry & Engineering Page 2 of 23 Abstract Kinetic modeling of transesterification of propylene carbonate with methanol using Fe-Mn double metal cyanide catalyst has been investigated based on experimental data obtained under kinetically controlled conditions in a batch slurry reactor in the 140-200 °C range. A simple two-step power law model was found to represent the experimental data well. In addition, a detailed kinetic model based on a molecular level description of the reaction mechanism is also evaluated to provide better insight into the reaction mechanism. -
Dimethyl Carbonate
SAN JOAQUIN VALLEY UNIFIED AIR POLLUTION CONTROL DISTRICT Appendix B: OEHHA Final Revised Assessment November 18, 2010 APPENDIX B OEHHA FINAL REVISED HEALTH ASSESSMENT FOR DIMETHYL CARBONATE November 18, 2010 Draft Staff Report with Appendices for Draft Amendments to Rule 1020 SAN JOAQUIN VALLEY UNIFIED AIR POLLUTION CONTROL DISTRICT Appendix B: OEHHA Final Revised Assessment November 18, 2010 This page intentionally blank. B-2 Draft Staff Report with Appendices for Draft Amendments to Rule 1020 Appendix B: OEHHA Assessment November 18, 2010 Office of Environmental Health Hazard Assessment Joan E. Denton, Ph.D., Director Headquarters ••• 1001 I Street ••• Sacramento, California 95814 Mailing Address: P.O. Box 4010 ••• Sacramento, California 95812-4010 Oakland Office ••• Mailing Address: 1515 Clay Street, 16th Floor ••• Oakland, California 94612 Linda S. Adams Arnold Schwarzenegger Secretary for Environmental Protectiony Governor M E M O R A N D U M TO: Richard Corey, Chief Research and Economic Studies Branch Research Division Air Resources Board FROM: Melanie A. Marty, Ph.D., Chief Air Toxicology and Epidemiology Branch DATE: December 8, 2009 SUBJECT: REVISED ASSESSMENT OF HEALTH EFFECTS OF EXPOSURE TO DIMETHYL CARBONATE, A CHEMICAL PETITIONED FOR EXEMPTION FROM VOC RULES Recently the Research Division sent the Office of Environmental Health Hazard Assessment (OEHHA) an application for VOC Exempt Status in the State of California for Dimethyl Carbonate. This was submitted by Kowa Corporation, who propose use of from 2 to possibly 5 million pounds of dimethyl carbonate per year as a niche solvent in California, if dimethyl carbonate is exempted from VOC regulations. In response to a request from the Division, OEHHA recently provided you a review of the health effects of dimethyl carbonate. -
Gas-Phase Synthesis of Dimethyl Carbonate from Methanol and Carbon Dioxide Over Co1.5PW12O40 Keggin-Type Heteropolyanion
Int. J. Mol. Sci. 2010, 11, 1343-1351; doi:10.3390/ijms11041343 OPEN ACCESS International Journal of Molecular Sciences ISSN 1422-0067 www.mdpi.com/journal/ijms Article Gas-Phase Synthesis of Dimethyl Carbonate from Methanol and Carbon Dioxide Over Co1.5PW12O40 Keggin-Type Heteropolyanion Ahmed Aouissi *, Zeid Abdullah Al-Othman and Amro Al-Amro Department of Chemistry, King Saud University, P.O. Box 2455, Riyadh-11451, Saudi Arabia * Author to whom correspondence should be addressed; E-Mail: [email protected]. Received: 22 January 2010; in revised form: 9 March 2010 / Accepted: 29 March 2010 / Published: 31 March 2010 Abstract: The reactivity of Co1.5PW12O40 in the direct synthesis of dimethyl carbonate (DMC) from CO2 and CH3OH was investigated. The synthesized catalyst has been characterized by means of FTIR, XRD, TG, and DTA and tested in gas phase under atmospheric pressure. The effects of the reaction temperature, time on stream, and methanol weight hourly space velocity (MWHSV) on the conversion and DMC selectivity were investigated. The highest conversion (7.6%) and highest DMC selectivity (86.5%) were obtained at the lowest temperature used (200 °C). Increasing the space velocity MWHSV increased the selectivity of DMC, but decreased the conversion. A gain of 18.4% of DMC selectivity was obtained when the MWHSV was increased from 0.65 h-1 to 3.2 h-1. Keywords: heteropolyanion; Keggin structure; methanol; dimethyl carbonate; direct synthesis; carbon dioxide 1. Introduction Dimethyl carbonate (DMC) has drawn much attention in recent years as an environmentally friendly versatile intermediate. It has been used as a good solvent [1], an alkylation agent [2], and a substitute for highly toxic phosgene and dimethyl sulfate in many chemical processes [3,4]. -
Volatile Organic Compounds, Polycyclic Aromatic Hydrocarbons and Elements in the Air of Ten Urban Homes
AIVC #13,657 J11<loor Air 2001; 11: 49-64 Copyrigfil © Mi111ksg11nl'd 2001 /itlp;//jo11mnls.1111111ksgnard.dlr/i11doornir L'IDOOR AIR Pd1lied in De1111111rk. All rights reserved ISSN 0905-6947 Volatile Organic Compounds, Polycyclic Aromatic Hydrocarbons and Elements in the Air of Ten Urban Homes MICHAEL R. VAN WINKLE1 AND PETER A. SCHEFF2* istics or occupant activities. The data indicate that several pre Abstract Ten homes were monitored at regular intervals from dietor variables, including mothball storage, air freshener use, June 1994 through April 1995 as part of a Public Health Assess and cooking activities, are reasonable predictors for emission ment in Southeast Chicago for exposure to volatile organic com rates of specific pollutants in the homes. pounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), and elements. Simultaneous 24-h indoor and outdoor samples were Received for review 24 March 1999. Accepted for publication 11 March 2000. collected. VOCs were and analyzed using USEPA Method T0-14 © Indoor Air (2001) with Selected Ion Monitoring Mass Spectrometry (GC/MS). PAHs were analyzed using USEPA Method T0-13 with GC/MS. Elements were collected on quartz fiber filters and analyzed by Inductively Coupled Argon Plasma (ICP) spectroscopy or Graph ite Furnace Atomic Absorption (GFA A). Continuous measure Introduction ments of C02 and temperature were recorded for each indoor Exposure to indoor airborne pollutants is a function of sample. Twenty-four h total C02 emissions were determined from occupancy and estimated gas stove usage and were moder many variables, including pollutant infiltration, exfil 2 ately correlated (R =0.19) with 24 h average indoor C02 concen tration, deposition, resuspension, filtration, and gener trations. -
Phosphorus and Sulfur Cosmochemistry: Implications for the Origins of Life
Phosphorus and Sulfur Cosmochemistry: Implications for the Origins of Life Item Type text; Electronic Dissertation Authors Pasek, Matthew Adam Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 07/10/2021 06:16:37 Link to Item http://hdl.handle.net/10150/194288 PHOSPHORUS AND SULFUR COSMOCHEMISTRY: IMPLICATIONS FOR THE ORIGINS OF LIFE by Matthew Adam Pasek ________________________ A Dissertation Submitted to the Faculty of the DEPARTMENT OF PLANETARY SCIENCE In Partial Fulfillment of the Requirements For the Degree of DOCTOR OF PHILOSOPHY In the Graduate College UNIVERSITY OF ARIZONA 2 0 0 6 2 THE UNIVERSITY OF ARIZONA GRADUATE COLLEGE As members of the Dissertation Committee, we certify that we have read the dissertation prepared by Matthew Adam Pasek entitled Phosphorus and Sulfur Cosmochemistry: Implications for the Origins of Life and recommend that it be accepted as fulfilling the dissertation requirement for the Degree of Doctor of Philosophy _______________________________________________________________________ Date: 04/11/2006 Dante Lauretta _______________________________________________________________________ Date: 04/11/2006 Timothy Swindle _______________________________________________________________________ Date: 04/11/2006 -
PATENT OFFICE 2,632,026 OXDATION OFAROMATIC HYDROCARBONS Joshua C
Patented Mar. 17, 1953 2,632,026 UNITED STATES PATENT OFFICE 2,632,026 OXDATION OFAROMATIC HYDROCARBONS Joshua C. Conner, Jr., Wilmington, Dei, assignor to Hercules Powder Company, Wilmington, Dei, a corporation of Delaware No Drawing. Application February 18, 1950, Serial No. 145,091 9 Cairms. (C. 260-610) 1. 2 This invention relates to a process for oxidizing of cumene at a temperature in excess of 20° C. an alkyl-substituted aromatic organic compound while simultaneously passing a stream of an having the structural formula, Oxygen-containing gas containing gaseous am Rt H monia, in catalytic amounts through the reac N / tion mixture. The reaction is continued until standard analytical data, such as refractive in R / Air dex, indicate the conversion of from about 10% to about 70% of the original cumene to oxygen in which R1 and R2 represent alkyl groups and ated products. The reaction mixture may then Ar represents either an aryl group or an alkaryl 0. be treated in accordance with known techniques group. More particularly, the invention relates to obtain a product containing preponderant to a process for the oxidation of compounds Such amounts of a,c-dimethylbenzyl hydroperoxide. as cumene in the liquid phase by naeans of no Having thus described the invention, the foll lecular. Oxygen. lowing examples are specific embodiments there It is known that cunene, for example, may be 5 of. All parts are parts by weight unless otherwise oxidized in the liquid phase by means of molec indicated. ular oxygen, but none of the processes hereto EXAMPLE 1. fore disclosed for the oxidation of cumene have resulted in substantial yields of a,c-dimethyl A glass reaction vessel equipped with a reflux benzyl hydroperoxide. -
A Convenient and Safe O-Methylation of Flavonoids with Dimethyl Carbonate (DMC)
Molecules 2011, 16, 1418-1425; doi:10.3390/molecules16021418 OPEN ACCESS molecules ISSN 1420-3049 www.mdpi.com/journal/molecules Article A Convenient and Safe O-Methylation of Flavonoids with Dimethyl Carbonate (DMC) Roberta Bernini *, Fernanda Crisante and Maria Cristina Ginnasi Dipartimento di Agrobiologia e Agrochimica, Università degli Studi della Tuscia, Via S. Camillo De Lellis, 01100 Viterbo, Italy * Author to whom correspondence should be addressed; E-Mail: [email protected]. Received: 16 November 2010; in revised form: 23 January 2011 / Accepted: 27 January 2011 / Published: 9 February 2011 Abstract: Dietary flavonoids exhibit beneficial health effects. Several epidemiological studies have focused on their biological activities, including antioxidant, antibacterial, antiviral, anti-inflammatory and cardiovascular properties. More recently, these compounds have shown to be promising cancer chemopreventive agents in cell culture studies. In particular, O-methylated flavonoids exhibited a superior anticancer activity than the corresponding hydroxylated derivatives being more resistant to the hepatic metabolism and showing a higher intestinal absorption. In this communication we describe a convenient and efficient procedure in order to prepare a large panel of mono- and dimethylated flavonoids by using dimethyl carbonate (DMC), an ecofriendly and non toxic chemical, which plays the role of both solvent and reagent. In order to promote the methylation reaction under mild and practical conditions, 1,8-diazabicyclo[5.4.0]undec-7- ene (DBU) was added in the solution; methylated flavonoids were isolated in high yields and with a high degree of purity. This methylation protocol avoids the use of hazardous and high toxic reagents (diazomethane, dimethyl sulfate, methyl iodide). Keywords: methylated flavonoids; ecofriendly methylation reaction; dimethyl carbonate (DMC); green chemistry 1. -
Recent Progress in Phosgene-Free Methods for Synthesis of Dimethyl Carbonate*
Pure Appl. Chem., Vol. 84, No. 3, pp. 603–620, 2012. http://dx.doi.org/10.1351/PAC-CON-11-06-02 © 2011 IUPAC, Publication date (Web): 22 September 2011 Recent progress in phosgene-free methods for synthesis of dimethyl carbonate* Weicai Peng1, Ning Zhao1, Fukui Xiao1, Wei Wei1,‡, and Yuhan Sun1,2,‡ 1State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China; 2Low Carbon Conversion Center, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, China Abstract: Dimethyl carbonate (DMC) is considered as an environmentally benign chemical due to negligible ecotoxicity, low bioaccumulation, and low persistence. However, the tradi- tional process of DMC synthesis via phosgene and methanol is limited in industry owing to the toxic raw material involved. Thus, environmentally friendly phosgene-free processes for DMC production have been proposed and developed in the past decades. Until now, the alter- natives appear to be the oxidative carbonylation of methanol, the transesterification of pro - pylene or ethylene carbonate (PC or EC), the methanolysis of urea, and the direct synthesis of DMC from CO2 with methanol. In this review, we present some recent developments of these phosgene-free approaches and their prospects for industrialization. Keywords: carbon dioxide; dimethyl carbonate synthesis; oxidative carbonylation; phosgene- free; transesterification; urea. INTRODUCTION Along with the global spread of sustainable development strategy, the chemical synthesis processes and materials endangering humans and the environment would be gradually restricted. The “clean produc- tion process” and “green chemicals” will be the developmental direction for the modern chemical indus- try, and the production and chemical utilization of dimethyl carbonate (DMC) are closely concerted by this trend. -
Propionate Dihydrate
(19) & (11) EP 2 247 572 B1 (12) EUROPEAN PATENT SPECIFICATION (45) Date of publication and mention (51) Int Cl.: of the grant of the patent: C07C 241/02 (2006.01) C07C 243/40 (2006.01) 03.08.2011 Bulletin 2011/31 (86) International application number: (21) Application number: 09713008.2 PCT/EP2009/051996 (22) Date of filing: 19.02.2009 (87) International publication number: WO 2009/103773 (27.08.2009 Gazette 2009/35) (54) A ONE-POT PROCESS FOR PREPARING 3-(2,2,2-TRIMETHYLHYDRAZINIUM)PROPIONATE DIHYDRATE EIN-TOPF-VERFAHREN ZUR HERSTELLUNG VON 3-(2,2,2-TRIMETHYLHYDRAZINIUM) PROPIONAT-DIHYDRAT PROCÉDÉ DE PRÉPARATION EN ENCEINTE UNIQUE DE DIHYDRATE DE 3-(2,2,2- TRIMÉTHYLHYDRAZINIUM)-PROPIONATE (84) Designated Contracting States: • OSVALDS, Pugovics AT BE BG CH CY CZ DE DK EE ES FI FR GB GR LV-1004 Riga (LV) HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL • CERNOBROVIJS, Aleksandrs PT RO SE SI SK TR LV-2114 Olaine (LV) Designated Extension States: • IEVINA, Agnija AL BA RS LV-1004 Riga (LV) • LEBEDEVS, Antons (30) Priority: 19.02.2008 LV 080022 LV-3600 Ventspils (LV) 19.02.2008 LV 080023 (56) References cited: (43) Date of publication of application: WO-A-2005/012233 US-A- 4 481 218 10.11.2010 Bulletin 2010/45 • GILLER S.A. ET AL,.: CHEMISTRY OF (73) Proprietor: Grindeks, a joint stock company HETEROCYCLIC COMPOUNDS, vol. 11, no. 12, Riga 1057 (LV) 1975, pages 1378-1382, XP002534780 (72) Inventors: • KALVINS, Ivars LV-15052 Ikskile (LV) Note: Within nine months of the publication of the mention of the grant of the European patent in the European Patent Bulletin, any person may give notice to the European Patent Office of opposition to that patent, in accordance with the Implementing Regulations. -
Experimental Analysis and Modeling Aspects of the Removal of Polycyclic Aromatic Hydrocarbons in Soil Slurry Bioreactors Douglas Pino Herrera
Experimental analysis and modeling aspects of the removal of polycyclic aromatic hydrocarbons in soil slurry bioreactors Douglas Pino Herrera To cite this version: Douglas Pino Herrera. Experimental analysis and modeling aspects of the removal of polycyclic aromatic hydrocarbons in soil slurry bioreactors. Earth Sciences. Université Paris-Est, 2018. English. NNT : 2018PESC2190. tel-03012451 HAL Id: tel-03012451 https://tel.archives-ouvertes.fr/tel-03012451 Submitted on 18 Nov 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Experimental analysis and modeling aspects of the removal of PAHs in soil slurry bioreactor Douglas Oswaldo Pino Herrera Thesis committee Thesis Promotor Reviewers Prof. Mehmet A. Oturan Prof. Marie-Odile Simonnot Université Paris-Est Université de Lorraine Marne-la-Vallée, France Nancy, France Thesis Co-Promotors Prof. Francesca Beolchini Dr. Hab. Eric D. van Hullebusch, Università Politecnica delle Marche Université Paris-Est Ancona, Italy Marne-la-Vallée, France Examiners Dr. Giovanni Esposito, Prof. Piet Lens University of Cassino and Southern Lazio UNESCO-IHE Delft Cassino, Italy Delft, The Netherlands Thesis Supervisor Dr. Yannick Fayolle Dr. Yoan Pechaud Irstea Université Paris-Est Antony, France Marne-la-Vallée, France Dr. -
Propylene Carbonate Extraction for Recovery of Poly-3-Hydroxybutryate
1 Propylene Carbonate Extraction for Recovery of Poly-3-hydroxybutryate Abstract Propylene Carbonate Distillation Poly -3-hydroxybutryate (PHB) is a biopolymer produced Propylene Carbonate is an organic solvent produced as a storage molecule for energy and carbon under • Waste solution recovered after PHB by combining propylene oxide with carbon dioxide. It is poor growth conditions in certain organisms. PHB is a precipitation consisted of Propylene considered a polar aprotic solvent (no proton to donate) class of polyhydroxyalkanoates (PHAs), which have Carbonate and Ethanol Due to its characteristics (low vapor pressure, stability, similar properties to plastics derived from petroleum. PHB provides an environmentally friendly alternative to and high polarity) it is used in many applications. These include • Through distillation, both the Ethanol production of fibers and textiles, dyeing, personal care agents petroleum -based plastics due to its biodegradability and and Propylene Carbonate have been and cosmetics, and a component of some adhesives. It is also method of production. It can be produced by recovered. considered non-toxic making it more suitable to use at larger recombinant Escherichia coli, harvested from the cell, scales. and recovered. One of the major expenses of • Recovered 70% Propylene producing PHB is the extraction of the PHB from the Carbonate and nearly all Ethanol biomass. This study focused on evaluating different methods of PHB extraction for their ability to effectively • Preliminary experiments show no extract PHB from E. coli biomass and the feasibility of Propylene Carbonate Extraction Procedure Distillation apparatus to recover Propylene difference in the yield of PHB scaling up those processes. These processes provide a Carbonate and Ethanol from waste stream extracted with distilled Propylene 125 L Bioreactor way to produce PHB from growing E.