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Methylacetat Produkt Beschreibung

Methyl acetate Struktur
79-20-9
CAS-Nr.
79-20-9
Bezeichnung:
Methylacetat
Englisch Name:
Methyl acetate
Synonyma:
Metile;Tereton;Devoton;FEMA 2676;CH3COOCH3;octanmetylu;Methylacetat;Methylacetaat;METHYL ACETATE;Acetic acid-Me
CBNumber:
CB9167443
Summenformel:
C3H6O2
Molgewicht:
74.08
MOL-Datei:
79-20-9.mol

Methylacetat Eigenschaften

Schmelzpunkt:
-98 °C
Siedepunkt:
57-58 °C(lit.)
Dichte
0.932 g/mL at 25 °C(lit.)
Dampfdichte
2.55 (vs air)
Dampfdruck
165 mm Hg ( 20 °C)
Brechungsindex
n20/D 1.361(lit.)
FEMA 
2676 | METHYL ACETATE
Flammpunkt:
3.2 °F
storage temp. 
Flammables area
Löslichkeit
250g/l
Aggregatzustand
Solution
Farbe
Clear colorless to slightly pale yellow
Relative polarity
0.253
Geruch (Odor)
Slightly acrid, sweet; fragrant.
Explosionsgrenze
3.1-16%(V)
Wasserlöslichkeit
250 g/L (20 ºC)
maximale Wellenlänge (λmax)
λ: 255 nm Amax: 1.0
λ: 275 nm Amax: 0.1
λ: 300 nm Amax: 0.01
Merck 
14,6008
JECFA Number
125
BRN 
1736662
Henry's Law Constant
0.90 at 20.00 °C, 1.56 at 30.00 °C (headspace-GC, Hovorka et al., 2002)
Expositionsgrenzwerte
TLV-TWA 200 ppm (~610 mg/m3) (ACGIH, MSHA, and OSHA); TLV-STEL 250 ppm (~760 mg/m3) (ACGIH); IDLH 10,000 ppm (NIOSH).
Stabilität:
Stable. Extremely flammable - readily forms explosive mixtures with air. Note low flash point and wide explosion limits. Incompatible with strong oxidizing agents, strong bases, strong acids, nitrates. May be moisture sensitive.
CAS Datenbank
79-20-9(CAS DataBase Reference)
NIST chemische Informationen
Acetic acid, methyl ester(79-20-9)
EPA chemische Informationen
Acetic acid, methyl ester(79-20-9)
Sicherheit
  • Risiko- und Sicherheitserklärung
  • Gefahreninformationscode (GHS)
Kennzeichnung gefährlicher F,Xi
R-Sätze: 11-36-66-67
S-Sätze: 16-26-29-33
RIDADR  UN 1231 3/PG 2
WGK Germany  1
RTECS-Nr. AI9100000
Selbstentzündungstemperatur 936 °F
TSCA  Yes
HS Code  2915 39 00
HazardClass  3
PackingGroup  II
Giftige Stoffe Daten 79-20-9(Hazardous Substances Data)
Toxizität LD50 orally in Rabbit: > 5000 mg/kg LD50 dermal Rat > 2000 mg/kg
Bildanzeige (GHS)
Alarmwort Achtung
Gefahrenhinweise
Code Gefahrenhinweise Gefahrenklasse Abteilung Alarmwort Symbol P-Code
H225 Flüssigkeit und Dampf leicht entzündbar. Entzündbare Flüssigkeiten Kategorie 2 Achtung P210,P233, P240, P241, P242, P243,P280, P303+ P361+P353, P370+P378,P403+P235, P501
H319 Verursacht schwere Augenreizung. Schwere Augenreizung Kategorie 2 Warnung P264, P280, P305+P351+P338,P337+P313P
H336 Kann Schläfrigkeit und Benommenheit verursachen. Spezifische Zielorgan-Toxizität (einmalige Exposition) Kategorie 3 (Schläfrigkeit und Benommenheit) Warnung P261, P271, P304+P340, P312,P403+P233, P405, P501
Sicherheit
P210 Von Hitze, heißen Oberflächen, Funken, offenen Flammen und anderen Zündquellenarten fernhalten. Nicht rauchen.
P261 Einatmen von Staub vermeiden.
P280 Schutzhandschuhe/Schutzkleidung/Augenschutz tragen.
P303+P361+P353 BEI BERÜHRUNG MIT DER HAUT (oder dem Haar): Alle kontaminierten Kleidungsstücke sofort ausziehen. Haut mit Wasser abwaschen oder duschen.
P305+P351+P338 BEI KONTAKT MIT DEN AUGEN: Einige Minuten lang behutsam mit Wasser spülen. Eventuell vorhandene Kontaktlinsen nach Möglichkeit entfernen. Weiter spülen.
P337+P313 Bei anhaltender Augenreizung: Ärztlichen Rat einholen/ärztliche Hilfe hinzuziehen.
P370+P378 Bei Brand: zum Löschen verwenden.
P405 Unter Verschluss aufbewahren.
P403+P235 An einem gut belüfteten Ort aufbewahren. Kühl halten.

Methylacetat Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD

FARBLOSE FLüSSIGKEIT MIT CHARAKTERISTISCHEM GERUCH.

PHYSIKALISCHE GEFAHREN

Die Dämpfe sind schwerer als Luft und können sich am Boden ausbreiten. Fernzündung möglich.

CHEMISCHE GEFAHREN

Zersetzung beim Erhitzen unter Einfluss von Luft, Basen, starken Oxidationsmitteln, UV-Licht. Feuer- und Explosionsgefahr. Starkes Reduktionsmittel. Reagiert mit Oxidationsmitteln. Greift viele Metalle in Gegenwart von Wasser an. Greift Kunststoffe an.

ARBEITSPLATZGRENZWERTE

TLV: 200 ppm (als TWA); 250 ppm (als STEL); (ACGIH 2005).
MAK: 100 ppm, 310 mg/m? Spitzenbegrenzung: überschreitungsfaktor I(4); Schwangerschaft: Gruppe C; (DFG 2005).

AUFNAHMEWEGE

Aufnahme in den Körper durch Inhalation der Dämpfe.

INHALATIONSGEFAHREN

Beim Verdampfen bei 20°C kann schnell eine gesundheitsschädliche Kontamination der Luft eintreten.

WIRKUNGEN BEI KURZZEITEXPOSITION

WIRKUNGEN BEI KURZZEITEXPOSITION:
Die Substanz reizt die Augen und die Atemwege. Möglich sind Auswirkungen auf das Zentralnervensystem mit nachfolgender Bewusstseinstrübung. Exposition weit oberhalb der Arbeitsplatzgrenzwerte kann zum Tod führen.

WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION

Die Flüssigkeit entfettet die Haut. Möglich sind Auswirkungen auf den Sehnerv mit nachfolgenden Sehstörungen.

LECKAGE

Ausgelaufene Flüssigkeit möglichst in abdichtbaren Behältern sammeln. Reste mit Sand oder inertem Absorptionsmittel aufnehmen und an einen sicheren Ort bringen. NICHT in die Kanalisation spülen. Persönliche Schutzausrüstung: Umgebungsluftunabhängiges Atemschutzgerät.

R-Sätze Betriebsanweisung:

R11:Leichtentzündlich.
R36:Reizt die Augen.
R66:Wiederholter Kontakt kann zu spröder oder rissiger Haut führen.
R67:Dämpfe können Schläfrigkeit und Benommenheit verursachen.

S-Sätze Betriebsanweisung:

S16:Von Zündquellen fernhalten - Nicht rauchen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S29:Nicht in die Kanalisation gelangen lassen.
S33:Maßnahmen gegen elektrostatische Aufladungen treffen.

Beschreibung

Methyl acetate, also known as Me O Ac , acetic acid methyl ester or methyl ethanoate, is a carboxylate ester with the formula CH3COOCH3. It is a flammable liquid with a characteristically pleasant smell reminiscent of some glues and nail polish removers. Methyl acetate is occasionally used as a solvent, being weakly polar and lipophilic, but its close relative ethyl acetate is a more common solvent being less toxic and less soluble in water. Methyl acetate has a solubility of 25% in water at room temperature. At elevated temperature its solubility in water is much higher. Methyl acetate is not stable in the presence of strong aqueous bases or aqueous acids. Methyl acetate is VOC exempt.

Chemische Eigenschaften

Methyl acetate is a colorless liquid with a fruity odor.

Chemische Eigenschaften

Methyl acetate has a pleasant, fruity odor and slightly bitter flavor. May be prepared by boiling acetic acid and methanol in the presence of acid catalysts; or by heating methanol with an excess carbon monoxide under pressure in the presence of a catalyst (phosphoric acid, cobalt salts).

Chemische Eigenschaften

Methyl acetate has a pleasant, fruity odor and slightly bitter flavor.

Chemische Eigenschaften

colourless liquid with a pleasant odour

Physikalische Eigenschaften

Colorless liquid with a pleasant odor. An odor threshold concentration of 48 ppbv was reported by Nagata and Takeuchi (1990). Cometto-Mu?iz and Cain (1991) reported an average nasal pungency threshold concentration of 112,500 ppmv.

Occurrence

Reported found in apple, banana, sweet and sour cherry, tangerine juice, black currants, guava, grapes, melon, peach, pear, pineapple, strawberry, cabbage, tomato, clove bud, peppermint oil, vinegar, bread, cheeses, butter, yogurt, beef, beer, cognac, rum, whiskies, cider, sherry, grape wines, cocoa, coffee, filbert, peanut, honey, soybean, olive, passion fruit, fruit brandies, fig, gin, kiwifruit, clary sage, arrack and nectarine.

Verwenden

Methyl acetate is used as a solvent forlacquers, resins, oils, and nitrocellulose; inpaint removers; as a flavoring agent; and inthe manufacture of artificial leather.

Verwenden

Solvent for nitrocellulose, acetylcellulose, and many resins and oils; manufacture of artificial leather.

synthetische

Methyl acetate is produced industrially via the carbonylation of methanol as a byproduct of the production of acetic acid.Methyl acetate also arises by esterification of acetic acid with methanol in the presence of strong acids such as sulfuric acid, this production process is famous because of Eastman Kodak's intensified process using a reactive distillation.
2–1-Reactions
In the presence of strong bases such as sodium hydroxide or strong acids such as hydrochloric acid or sulfuric acid it is hydrolyzed back into methanol and acetic acid, especially at elevated temperature. The conversion of methyl acetate back into its components, by an acid , is a first-order reaction with respect to the ester. The reaction of methyl acetate and a base, for example sodium hydroxide, is a second-order reaction with respect to both reactants.
3-Applications
A major use of methyl acetate is as a volatile low toxicity solvent in glues, paints, and nail polish removers. Acetic anhydride is produced by carbonylation of methyl acetate in a process that was inspired by the Monsanto acetic acid synthesis.

Aroma threshold values

Detection: 1.5 to 47 ppm

Taste threshold values

Taste characteristics at 60 ppm: green, ethereal, fruity, fresh, rum and whiskey-like.

Allgemeine Beschreibung

A clear colorless liquid with a fragrant odor. Moderately toxic. Flash point 14°F. Vapors heavier than air.

Air & Water Reaktionen

Highly flammable. Water soluble.

Reaktivität anzeigen

Methyl acetate presents a fire or explosion hazard when exposed to strong oxidizing agents. Emits irritating fumes and acrid smoke when heated to decomposition, [Lewis, 3rd ed., 1993, p. 826]. Methyl acetate reactivity is consistent with other compounds of the ester group.

Hazard

Flammable, dangerous fire and explosion risk, explosive limits in air 3–16%. Irritant to respiratory tract. Headache, dizziness, nausea, eye damage (degeneration of ganglion cells in the retina).

Health Hazard

(Very similar to those of methyl alcohol, which constitutes 20% of commercial grade.) Inhalation causes headache, fatigue, and drowsiness; high concentrations can produce central nervous system depression and optic nerve damage. Liquid irritates eyes and may cause defatting and cracking of skin. Ingestion causes headache, dizziness, drowsiness, fatigue; may cause severe eye damage.

Health Hazard

The toxic effects from exposure to methylacetate include inflammation of the eyesvisual and nervous disturbances, tightnessof the chest, drowsiness, and narcosis. Ithydrolyzes in body to methanol, which prob ably produces the atrophy of the optic nerve.A 4-hour exposure to 32,000 ppm was lethalto rats. Oral and dermal toxicities of thiscompound are low. An oral LD50 value inrats is on the order of 5000 mg/kg.

Brandgefahr

Behavior in Fire: Vapor is heavier than air and may travel a considerable distance to a source of ignition and flash back.

Chemische Reaktivität

Reactivity with Water Reacts slowly to form acetic acid and methyl alcohol; the reaction is not violent; Reactivity with Common Materials: No reaction; Stability During Transport: Stable; Neutralizing Agents for Acids and Caustics: Not pertinent; Polymerization: Not pertinent; Inhibitor of Polymerization: Not pertinent.

Sicherheitsprofil

Moderately toxic by several routes. A human systemic irritant by inhalation. A moderate skin and eye irritant. Mutation data reported. Dangerous fire hazard when exposed to heat, flame, or oxidizers. Moderate explosion hazard when exposed to heat or flame. When heated to decomposition it emits acrid smoke and fumes. See also ESTERS.

Chemical Synthesis

By boiling acetic acid and methanol in the presence of acid catalysts, or by heating methanol with an excess of carbon monoxide under pressure in the presence of a catalyst (phosphoric acid, cobalt salts).

mögliche Exposition

Methyl acetate is used as a solvent in lacquers and paint removers; and as an intermediate in pharmaceutical manufacture.

Environmental Fate

Photolytic. A rate constant of 2.00 x 10-13 cm3/molecule?sec was reported for the reaction of methyl acetate and OH radicals in aqueous solution (Wallington et al., 1988b).
Chemical/Physical. Slowly hydrolyzes in water yielding methyl alcohol and acetic acid (NIOSH, 1997). The estimated hydrolysis half-life in water at 25 °C and pH 7 is 2.5 yr (Mabey and Mill, 1978).
At an influent concentration of 1,030 mg/L, treatment with GAC resulted in an effluent concentration of 760 mg/L. The adsorbability of the carbon used was 54 mg/g carbon (Guisti et al., 1974).

Versand/Shipping

UN1231 Methyl acetate, Hazard Class: 3; Labels: 3-Flammable liquid.

läuterung methode

Methanol in methyl acetate can be detected by measuring its solubility in water. At 20o, the solubility of methyl acetate in water is ca 35g per 100mL, but 1% MeOH confers complete miscibility. Methanol can be removed by conversion to methyl acetate, by refluxing for 6hours with acetic anhydride (85mL/L), followed by fractional distillation. Acidic impurities can be removed by shaking with anhydrous K2CO3 and distilling. An alternative treatment is with acetyl chloride, followed by washing with concentrated NaCl and drying with CaO or MgSO4. (Solid CaCl2 cannot be used because it forms a crystalline addition compound.) Distillation from copper stearate destroys peroxides. Free alcohol or acid can be eliminated from methyl acetate by shaking with strong aqueous Na2CO3 or K2CO3 (three times), then with aqueous 50% CaCl2 (three times), saturated aqueous NaCl (twice), drying with K2CO3 and distilling it from P2O5. [Beilstein 2 IV 122.]

Inkompatibilitäten

Vapor may form explosive mixture with air. A Strong reducing agent. Incompatible water, acids, nitrates, strong oxidizers; alkalis. Attacks some plastics. Attacks many metals in presence of water. Reacts slowly with water, forming acetic acid and methanol. Decomposes in heat; on contact with air, bases, strong oxidizers; UV-light; possible fire and explosion hazard

Waste disposal

Dissolve or mix the material with a combustible solvent and burn in a chemical incinerator equipped with an afterburner and scrubber. All federal, state, and local environmental regulations must be observed.

Methylacetat Upstream-Materialien And Downstream Produkte

Upstream-Materialien

Downstream Produkte


Methylacetat Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

Global( 255)Lieferanten
Firmenname Telefon Fax E-Mail Land Produktkatalog Edge Rate
Shenzhen Sendi Biotechnology Co.Ltd.
0755-23311925 18102838259
0755-23311925 Abel@chembj.com CHINA 3194 55
Henan DaKen Chemical CO.,LTD.
+86-371-55531817
info@dakenchem.com CHINA 21676 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693
0371-55170693 info@tianfuchem.com CHINA 20672 55
Mainchem Co., Ltd.
+86-0592-6210733
+86-0592-6210733 sales@mainchem.com CHINA 32447 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 info@tnjchem.com China 1861 55
Tianjin Zhongxin Chemtech Co., Ltd.
022-89880739
022-66880086 sales@tjzxchem.com CHINA 575 58
Hebei Chisure Biotechnology Co., Ltd.
+8613292890173
0311 66567340 luna@speedgainpharma.com CHINA 1017 58
career henan chemical co
+86-371-86658258
sales@coreychem.com CHINA 30001 58
Hubei Jusheng Technology Co.,Ltd.
86-18871470254
027-59599243 sales@jushengtech.com CHINA 28236 58
Jinan Finer Chemical Co., Ltd
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+86-531-88989539 sales@finerchem.com CHINA 947 58

79-20-9(Methylacetat)Verwandte Suche:


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