ZA784321B - Process for preparing ethene - Google Patents

Process for preparing ethene

Info

Publication number
ZA784321B
ZA784321B ZA00784321A ZA784321A ZA784321B ZA 784321 B ZA784321 B ZA 784321B ZA 00784321 A ZA00784321 A ZA 00784321A ZA 784321 A ZA784321 A ZA 784321A ZA 784321 B ZA784321 B ZA 784321B
Authority
ZA
South Africa
Prior art keywords
preparing ethene
ethene
preparing
Prior art date
Application number
ZA00784321A
Other languages
English (en)
Inventor
J Silva
H Barrocas
R Assis
Original Assignee
Petroleo Brasileiro Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4006904&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ZA784321(B) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Petroleo Brasileiro Sa filed Critical Petroleo Brasileiro Sa
Publication of ZA784321B publication Critical patent/ZA784321B/xx

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C1/00Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
    • C07C1/20Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
    • C07C1/24Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms by elimination of water
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2521/00Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium
    • C07C2521/02Boron or aluminium; Oxides or hydroxides thereof
    • C07C2521/04Alumina
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2521/00Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium
    • C07C2521/06Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • C07C2521/08Silica
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2521/00Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium
    • C07C2521/12Silica and alumina
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2521/00Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium
    • C07C2521/18Carbon
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2523/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00
    • C07C2523/02Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of the alkali- or alkaline earth metals or beryllium
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2523/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00
    • C07C2523/16Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • C07C2523/24Chromium, molybdenum or tungsten
    • C07C2523/28Molybdenum
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2527/00Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • C07C2527/14Phosphorus; Compounds thereof
    • C07C2527/16Phosphorus; Compounds thereof containing oxygen
    • C07C2527/167Phosphates or other compounds comprising the anion (PnO3n+1)(n+2)-
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2527/00Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • C07C2527/14Phosphorus; Compounds thereof
    • C07C2527/16Phosphorus; Compounds thereof containing oxygen
    • C07C2527/167Phosphates or other compounds comprising the anion (PnO3n+1)(n+2)-
    • C07C2527/173Phosphoric acid or other acids with the formula Hn+2PnO3n+1
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2529/00Catalysts comprising molecular sieves
    • C07C2529/04Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites, pillared clays
    • C07C2529/06Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/52Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
ZA00784321A 1977-08-09 1978-07-31 Process for preparing ethene ZA784321B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BR7705256A BR7705256A (pt) 1977-08-09 1977-08-09 Processo e preparacao de eteno

Publications (1)

Publication Number Publication Date
ZA784321B true ZA784321B (en) 1979-07-25

Family

ID=4006904

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA00784321A ZA784321B (en) 1977-08-09 1978-07-31 Process for preparing ethene

Country Status (13)

Country Link
US (1) US4232179A (cg-RX-API-DMAC7.html)
JP (1) JPS5919927B2 (cg-RX-API-DMAC7.html)
AR (1) AR215330A1 (cg-RX-API-DMAC7.html)
AU (1) AU524261B2 (cg-RX-API-DMAC7.html)
BE (1) BE869500A (cg-RX-API-DMAC7.html)
BR (1) BR7705256A (cg-RX-API-DMAC7.html)
DE (1) DE2834699C2 (cg-RX-API-DMAC7.html)
FR (1) FR2399992B1 (cg-RX-API-DMAC7.html)
GB (1) GB2002416B (cg-RX-API-DMAC7.html)
IN (1) IN150493B (cg-RX-API-DMAC7.html)
KE (1) KE3366A (cg-RX-API-DMAC7.html)
MX (1) MX147969A (cg-RX-API-DMAC7.html)
ZA (1) ZA784321B (cg-RX-API-DMAC7.html)

Families Citing this family (76)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR8101487A (pt) * 1981-03-13 1982-10-26 Petroleo Brasileiro Sa Processo de desidratacao de um alcool de baixo peso molecular
JPS57190650A (en) * 1981-05-15 1982-11-24 Agency Of Ind Science & Technol Porous crystalline catalyst for olefin synthesis
US4404414A (en) * 1982-09-28 1983-09-13 Mobil Oil Corporation Conversion of methanol to gasoline
US4590320A (en) * 1984-08-31 1986-05-20 Mobil Oil Corporation Conversion of methanol to olefins in a tubular reactor with light olefin co-feeding
JPS6434929A (en) * 1987-07-30 1989-02-06 Jgc Corp Method for dehydrating reaction of ethanol
US4885405A (en) * 1987-12-10 1989-12-05 Horst Dornhagen Process for the production of pure dimethylether and a catalyst used in the process
JPH11217343A (ja) * 1998-01-30 1999-08-10 Sangi Co Ltd 化学工業原料及びハイオク燃料の合成法
US20050175519A1 (en) * 2004-02-06 2005-08-11 Rogers William A.Jr. Microchannel compression reactor
CN101304963A (zh) 2005-11-14 2008-11-12 三井化学株式会社 含有来源于生物有机体的碳的丙烯的制造方法
EP1792885A1 (en) * 2005-11-29 2007-06-06 BP Chemicals Limited Process for producing ethylene
EP1792886A1 (en) * 2005-11-29 2007-06-06 BP Chemicals Limited Process for producing propylene
EP1790627A1 (en) * 2005-11-29 2007-05-30 BP Chemicals Limited Process for producing olefins
BRPI0601803A (pt) * 2006-05-18 2008-02-19 Helcio Valladares Barrocas processo para produção de eteno a partir de álcool etìlico
JP2010030902A (ja) * 2006-11-21 2010-02-12 Mitsui Chemicals Inc エチレンの製造方法
EP1992601A1 (en) * 2007-05-11 2008-11-19 Ineos Europe Limited Dehydration of alcohols over supported heteropolyacids
EP2050730A1 (en) * 2007-10-17 2009-04-22 BP Chemicals Limited Process for preparing ethene
ES2372235T3 (es) * 2007-12-05 2012-01-17 Braskem S.A. Proceso integrado para la producción de copolímero de etileno-butileno, un copolímero de etileno-butileno y el uso de etileno y 1-butileno, como comonómero, procedente de materias primas naturales renovables.
EP2108636A1 (en) * 2008-04-11 2009-10-14 Total Petrochemicals Research Feluy Dehydration of alcohols in the presence of an inert component.
EP2108637A1 (en) * 2008-04-11 2009-10-14 Total Petrochemicals Research Feluy Process to make olefins from ethanol.
EP2238096A1 (en) * 2008-02-07 2010-10-13 Total Petrochemicals Research Feluy Process to make olefins from ethanol
EP2238093A1 (en) * 2008-02-07 2010-10-13 Total Petrochemicals Research Feluy Dehydration of alcohols in the presence of an inert component
EP2108634A1 (en) 2008-04-11 2009-10-14 Total Petrochemicals Research Feluy Dehydration of alcohols on crystalline silicates
EP2090561A1 (en) 2008-02-07 2009-08-19 Total Petrochemicals Research Feluy Dehydration of alcohols on crystalline silicates
AU2009211364B2 (en) * 2008-02-07 2012-01-19 Total Petrochemicals Research Feluy Dehydration of alcohols on crystalline silicates
EP2108635A1 (en) 2008-04-11 2009-10-14 Total Petrochemicals Research Feluy Process to make olefins from ethanol
CN101939276B (zh) * 2008-02-07 2013-05-08 道达尔石油化学产品研究弗吕公司 由乙醇制造烯烃的方法
FR2934599B1 (fr) * 2008-07-29 2012-12-21 Arkema France Fabrication de polyethylene a partir de matieres renouvelables, polyethylene obtenu et utilisations
JP2010042343A (ja) * 2008-08-12 2010-02-25 National Institute Of Advanced Industrial & Technology 低級オレフィン製造用触媒、その製造方法及びこれを用いた低級オレフィンの製造方法
EP2192101A1 (en) 2008-11-28 2010-06-02 Total Petrochemicals Research Feluy Purification of alcohols prior to their use in the presence of an acid catalyst
MY154353A (en) 2008-11-28 2015-05-29 Total Petrochemicals Res Feluy Purfication of alcohols prior to their use in the presence of an acid catalyst
CN102471198B (zh) 2009-07-01 2015-03-11 陶氏环球技术有限责任公司 由脂族醇制备烯烃的工艺
CN102884026B (zh) 2010-02-24 2014-10-29 英国石油有限公司 制备烯烃的方法
KR20130008536A (ko) 2010-02-24 2013-01-22 비피 피이. 엘. 시이. 알켄 제조 방법
FR2959751B1 (fr) 2010-05-06 2012-06-08 Inst Francais Du Petrole Procede de production de base pour carburants a partir d'une charge ethylenique mettant en oeuvre au moins une etape d'oligomerisation en presence d'un systeme catalytique homogene.
FR2959750B1 (fr) 2010-05-06 2013-02-15 Inst Francais Du Petrole Procede de production de kerosene a partir de bio-ethanol.
FR2959752B1 (fr) 2010-05-06 2012-06-08 Inst Francais Du Petrole Procede flexible de transformation de l'ethanol en distillats moyens mettant en oeuvre un systeme catalytique homogene et un systeme catalytique heterogene.
CN102381927B (zh) * 2010-09-01 2014-04-30 中国石油化工股份有限公司 一种由乙醇合成乙苯的方法
CN102381922B (zh) * 2010-09-01 2014-04-30 中国石油化工股份有限公司 一种由乙醇合成乙烯的方法
EP2729433B1 (en) * 2011-07-07 2020-08-05 Ineos Europe AG Process for producing olefins with heat transfer from steam cracking to alcohol dehydration process.
FR2978146B1 (fr) * 2011-07-21 2013-08-30 IFP Energies Nouvelles Procede de deshydratation de l'ethanol en ethylene a basse consommation energetique
FR2981065B1 (fr) 2011-10-07 2014-03-14 IFP Energies Nouvelles Procede de deshydratation de l'ethanol dilue en ethylene a basse consommation energetique sans recyclage de l'eau.
EP2594547A1 (en) 2011-11-17 2013-05-22 Solvay Sa Process for the manufacture of at least one ethylene derivative compound from bioethanol
US20130178674A1 (en) * 2012-01-09 2013-07-11 Hassan Taheri Reactor and process for dehydration of ethanol to ethylene
US20150265992A1 (en) * 2014-03-20 2015-09-24 Petron Scientec Inc. Reactor and process for dehydration of ethanol to ethylene
US20170266635A1 (en) * 2012-01-09 2017-09-21 Petron Scientech, Inc. Reactor and process for the dehydration of ethanol to ethylene
US9738575B2 (en) 2012-05-16 2017-08-22 China Petroleum & Chemical Corporation Apparatus for producing ethylene and a producing method thereof
FR2998567B1 (fr) 2012-11-27 2014-12-26 IFP Energies Nouvelles Procede de deshydratation d'ethanol en ethylene mettant en oeuvre un pretraitement de la charge
FR2998568B1 (fr) 2012-11-27 2015-01-23 IFP Energies Nouvelles Procede de deshydratation de l'ethanol en ethylene a basse consommation
EP2740718A1 (de) 2012-12-04 2014-06-11 Linde Aktiengesellschaft Verfahren zur katalytischen Dehydratisierung von Olefinen
FR3001969B1 (fr) 2013-02-12 2015-08-21 IFP Energies Nouvelles Procede de production d'oxyde d'ethylene a partir d'un flux d'ethanol thermiquement integre
FR3001968B1 (fr) 2013-02-12 2015-02-27 IFP Energies Nouvelles Procede de production d'oxyde d'ethylene a partir d'un flux d'ethanol thermo-mecaniquement integre
CA2933331C (en) 2013-12-13 2022-01-18 Dow Global Technologies Llc Alkanol to alkylene conversion using at least two different catalysts in sequential order
PT3233766T (pt) * 2014-12-16 2023-11-07 Technip E & C Ltd Processo e aparelho para desidratação de etanol
US10544067B2 (en) 2014-12-31 2020-01-28 Total Research & Technology Feluy Process for preparing olefins by dehydrating alcohols with less side effects comprising addition of organic acids
WO2016107759A1 (en) 2014-12-31 2016-07-07 Total Research & Technology Feluy Process for preparing olefins by dehydrating alcohols with less side effects comprising addition of sulfur containing compounds
FI129508B (fi) * 2018-04-20 2022-03-31 Jani Karvanen Kaatopää ja menetelmä pienpuun korjaamiseen
US11260367B2 (en) 2018-12-12 2022-03-01 Instituto Nacional De Tecnologia Catalytic system and process for the production of light olefins from ethanol
FR3089973B1 (fr) 2018-12-14 2020-12-25 Ifp Energies Now Procédé de déshydratation de l'éthanol en éthylène à basse consommation énergétique
US11905396B2 (en) 2019-09-30 2024-02-20 Enlightened Product Solutions, LLC Renewably-sourced biodegradable polyolefin packaging, utensils, and containers
JP2024121026A (ja) * 2022-08-30 2024-09-06 旭化成株式会社 エタノール及びエチレンの変換方法、プロピレンの製造方法、芳香族化合物の製造方法、並びに、エタノール及びエチレンの変換装置
JP7752192B2 (ja) * 2022-01-31 2025-10-09 旭化成株式会社 エタノールの変換方法、及びその他炭化水素の製造方法
US20240182801A1 (en) * 2022-08-30 2024-06-06 Uop Llc Steam integration in ethanol to jet fuel process
US20240076249A1 (en) * 2022-08-30 2024-03-07 Uop Llc Radial flow reactor for an ethanol dehydration process
US12479779B2 (en) * 2022-08-30 2025-11-25 Uop Llc Steam integration in ethanol to jet fuel process
JP2024051654A (ja) * 2022-09-30 2024-04-11 旭化成株式会社 エタノールの変換方法、炭化水素の製造方法、プロピレンの製造方法、芳香族化合物の製造方法、並びに、エタノールの変換装置
EP4596525A1 (en) * 2022-09-30 2025-08-06 Asahi Kasei Kabushiki Kaisha Ethanol conversion method, hydrocarbon production method, propylene production method, aromatic compound production method, and ethanol conversion device
CN120129669A (zh) 2022-10-28 2025-06-10 巴斯夫欧洲公司 从可再生来源的乙醇制造感兴趣的c4-烯烃衍生的化学品、特别是柠檬醛的方法
WO2024089252A1 (en) 2022-10-28 2024-05-02 Basf Se Process for the manufacture of a propylene-derived chemical of interest, in particular an acrylic ester, from renewably-sourced ethanol
CN120435448A (zh) 2022-12-20 2025-08-05 巴斯夫欧洲公司 结合产生热能制造乙烯衍生的感兴趣的化学品
EP4638400A1 (en) 2022-12-20 2025-10-29 Basf Se Manufacture of an ethylene-derived chemical of interest, in particular acrylic acid, in combination with generation of heated steam
FR3153613B1 (fr) 2023-09-29 2025-10-10 Ifp Energies Now Procede de production de distillats moyens en particulier de kerosene a partir d’une charge alcoolique
WO2025078362A1 (en) 2023-10-09 2025-04-17 Basf Se Process for the manufacture of styrene acrylic copolymers having a renewably-sourced carbon content
WO2025078353A1 (en) 2023-10-09 2025-04-17 Basf Se Manufacture of ethylene-derived chemicals having a bio-based carbon content from pyrolysis oil
WO2025078359A1 (en) 2023-10-09 2025-04-17 Basf Se Manufacture of ethylene-derived chemicals having a bio-based carbon content from bio-naphtha
WO2025224042A1 (en) 2024-04-23 2025-10-30 Basf Se Process for the manufacture of renewably-sourced n-butanol or 2-ethylhexanol
FR3163379A1 (fr) 2024-06-18 2025-12-19 IFP Energies Nouvelles Procédé d’hydrogénation des oléfines contenues dans une charge oléfinique de type distillats moyens en présence d’un catalyseur de nickel cuivre

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1909356A (en) * 1928-02-27 1933-05-16 Selden Co Catalytic dehydration of alcohols
DE501198C (de) * 1928-11-10 1930-06-28 Chem Fab Dr Hugo Stoltzenberg Vorrichtung zur Entwicklung von AEthylen
US2377026A (en) * 1940-10-01 1945-05-29 Air Reduction Method of dehydrating alcohols
NL63902C (cg-RX-API-DMAC7.html) * 1944-12-04
US2949493A (en) * 1958-10-03 1960-08-16 Happel John Production of divinyl acetylenes by the dehydration of vinyl acetylenic alcohols in the presence of steam
US4052479A (en) * 1973-08-09 1977-10-04 Mobil Oil Corporation Conversion of methanol to olefinic components
US4025576A (en) * 1975-04-08 1977-05-24 Mobil Oil Corporation Process for manufacturing olefins

Also Published As

Publication number Publication date
MX147969A (es) 1983-02-17
AU524261B2 (en) 1982-09-09
DE2834699A1 (de) 1979-02-22
GB2002416B (en) 1982-03-03
AR215330A1 (es) 1979-09-28
US4232179A (en) 1980-11-04
IN150493B (cg-RX-API-DMAC7.html) 1982-10-23
BE869500A (fr) 1978-12-01
AU3873278A (en) 1980-02-14
JPS5919927B2 (ja) 1984-05-09
FR2399992A1 (fr) 1979-03-09
US4232179B1 (cg-RX-API-DMAC7.html) 1987-12-08
JPS5436203A (en) 1979-03-16
KE3366A (en) 1984-02-03
FR2399992B1 (fr) 1985-08-09
GB2002416A (en) 1979-02-21
DE2834699C2 (de) 1986-11-06
BR7705256A (pt) 1979-04-03

Similar Documents

Publication Publication Date Title
GB2002416B (en) Process for preparing ethene
YU40320B (en) Process for preparing esterstine
GB2004493B (en) Process for preparing aluminus
GB2011899B (en) Process for preparing vincadifformine
HU179428B (en) Process for preparing 1-acyl-2-cyano-aziridines
HU179663B (en) Process for preparing d-alpha-aminoacids
HU179803B (en) Process for preparing glucopyranose-nitroso-carbamides
JPS53119837A (en) Process for preparing nitrosobenzole
JPS53105426A (en) Process for preparing acylcyanate
PT68934A (en) Process for preparing 4a-aryl-octahydro-1h-2-pyrindines
DE2860177D1 (en) Process for preparing acetylaminobenzenes
GB2012756B (en) Process for preparing 5-arylhydantoins
DE2860421D1 (en) Process for preparing 1-amino-2-sulfo-4-bromanthraquinone
JPS53105423A (en) Process for preparing alphaaketocarboxylate
JPS53121750A (en) Process for preparing naphtylaminehydroxysulfonate
DE2860171D1 (en) Process for preparing 1-amino-2-sulfo-4-bromo-anthraquinone
JPS5439022A (en) Process for preparing trihalogenized monohydrocarbyltin
JPS53112813A (en) Process for preparing diinnpropylacetonitrile
IL55072A0 (en) Process for preparing butyl-p-benzoylbenzoates
IL54355A (en) Process for preparing 2-hydroxy-benzothiazole
JPS53141263A (en) Process for preparing 33bromphtalide
JPS53112805A (en) Process for preparing diinnpropylacetamide
JPS52122304A (en) Process for preparing acylcyanide
HU178987B (en) Process for preparing alkyl-isocyanates
JPS53135910A (en) Process for preparing ethylenediaminedihydroiodide