4-Methylpentan-2-on

Gefahreninformationscode (GHS)

• Bildanzeige (GHS)

  

• Alarmwort

  Achtung

• Gefahrenhinweise

  H225：Flüssigkeit und Dampf leicht entzündbar.

  H319：Verursacht schwere Augenreizung.

  H332：Gesundheitsschädlich bei Einatmen.

  H335：Kann die Atemwege reizen.

• Sicherheit

  P210：Von Hitze, heißen Oberflächen, Funken, offenen Flammen und anderen Zündquellenarten fernhalten. Nicht rauchen.

  P233：Behälter dicht verschlossen halten.

  P240：Behälter und zu befüllende Anlage erden.

  P241：Explosionsgeschützte [elektrische/Lüftungs-/ Beleuchtungs-/...] Geräte verwenden.

  P305+P351+P338：BEI KONTAKT MIT DEN AUGEN: Einige Minuten lang behutsam mit Wasser spülen. Eventuell vorhandene Kontaktlinsen nach Möglichkeit entfernen. Weiter spülen.

4-Methyl-2-pentanone Chemische Eigenschaften,Einsatz,Produktion Methoden

• ERSCHEINUNGSBILD

  FARBLOSE FLüSSIGKEIT MIT CHARAKTERISTISCHEM GERUCH.

• PHYSIKALISCHE GEFAHREN

  Die Dämpfe mischen sich leicht mit Luft. Bildung explosionsfähiger Gemische.

• CHEMISCHE GEFAHREN

  Bildung explosionsfähiger Peroxide bei Kontakt mit Luft möglich. Reagiert sehr heftig mit starken Oxidationsmitteln und starken Reduktionsmitteln.

• ARBEITSPLATZGRENZWERTE

  TLV: 50 ppm (als TWA); 75 ppm (als STEL); BEI vorhanden; (ACGIH 2005).
  MAK: 20 ppm, 83 mg/m? Spitzenbegrenzung: überschreitungsfaktor I(2); Hautresorption; Schwangerschaft: Gruppe C; (DFG 2005).
  

• AUFNAHMEWEGE

  Aufnahme in den Körper durch Inhalation der Dämpfe und durch Verschlucken.

• INHALATIONSGEFAHREN

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

• WIRKUNGEN BEI KURZZEITEXPOSITION

  WIRKUNGEN BEI KURZZEITEXPOSITION:
  Die Substanz und der Dampf reizen Augen, Haut und Atemwege. Verschlucken kann zur Aufnahme in der Lunge führen; Gefahr der Aspirationspneumonie. Möglich sind Auswirkungen auf das Zentralnervensystem (bei hohen Konzentrationen) mit nachfolgender Narkose.

• WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION

  Wiederholter oder andauernder Hautkontakt kann Dermatitis hervorrufen.

• LECKAGE

  Belüftung. Ausgelaufene Flüssigkeit möglichst in abdichtbaren Behältern sammeln. Reste mit Sand oder inertem Absorptionsmittel aufnehmen und an einen sicheren Ort bringen. Persönliche Schutzausrüstung: Atemschutzfilter für organische Gase und Dämpfe.

• R-Sätze Betriebsanweisung:

  R11:Leichtentzündlich.
  R20:Gesundheitsschädlich beim Einatmen.
  R36/37:Reizt die Augen und die Atmungsorgane.
  R66:Wiederholter Kontakt kann zu spröder oder rissiger Haut führen.
  R39/23/24/25:Giftig: ernste Gefahr irreversiblen Schadens durch Einatmen, Berührung mit der Haut und durch Verschlucken.
  R23/24/25:Giftig beim Einatmen, Verschlucken und Berührung mit der Haut.

• S-Sätze Betriebsanweisung:

  S9:Behälter an einem gut gelüfteten Ort aufbewahren.
  S16:Von Zündquellen fernhalten - Nicht rauchen.
  S29:Nicht in die Kanalisation gelangen lassen.
  S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
  S36/37:Bei der Arbeit geeignete Schutzhandschuhe und Schutzkleidung tragen.
  S7:Behälter dicht geschlossen halten.

• Beschreibung

  4-Methyl-2-pentanone has a pleasant odor. May be prepared by hydrogenation of mesityl oxide over Ni at 160 - 190°C; also by oxidation of methyl isobutyl carbinol.

• Chemische Eigenschaften

  4-Methyl-2-pentanone has a fruity, ethereal, spicy (on dilution) odor.

• Chemische Eigenschaften

  4-Methyl-2-pentanone, also known as Methyl isobutyl ketone (MIBK), is a colorless liquid with a pleasant, sweet, fruity odor. The odor threshold can be as low as 0.10 ppm. It is 2% soluble in water by weight and with several other organic solvents. The lower explosive limit is 1.2% and the upper explosive limit is 8.0% at 200 °F. Methyl isobutyl ketone may be incompatible with strong oxidizers and potassium tert-butoxide.

• Physikalische Eigenschaften

  Clear, colorless, watery liquid with a mild, pleasant odor. Odor threshold concentration is 47 ppb_v (Leonardos et al., 1969). Experimentally determined detection and recognition odor threshold concentrations were 400 μg/m³ (100 ppb_v) and 1.1 mg/m³ (270 ppb_v), respectively (Hellman and Small, 1974).

• Occurrence

  Reported found in orange and lemon juice, grape; vinegar, baked potato, papaya, ginger, wheat bread, cheeses, milk, cooked egg, roast chicken, cooked beef, lamb fat, pork liver, hop oil, beer, cognac, coffee, tea, plumcot, plum brandy, mushroom, trassi, sesame seed, buckwheat, wort, elder flower, Bourbon vanilla, clary and red sage, crab, clam and Chinese quince.

• Verwenden

  Methyl isobutyl ketone (hexone, isobutyl methyl ketone, 4-methyl-2-pentanone) is an organic solvent similar in structure and use to methyl butyl ketone. In addition to its use as a solvent for paints, lacquers, and varnishes, methyl isobutyl ketone is used in extraction processes and as a denaturant for rubbing alcohol. Methyl isobutyl ketone is also used as a synthetic flavoring in some varieties of rum, candy, and cheese. Unlike methyl butyl ketone, methyl isobutyl ketone has not been found to occur naturally.

• Verwenden

  In paints, glues, and cleaning agents; used in the plastic and petrol industries

• Verwenden

  MIBK is used as a solvent for gums, resins,nitrocellulose and cellulose ethers, and various fats, oils, and waxes.

• Vorbereitung Methode

  Methyl isobutyl ketone can be manufactured by two processes . The first is a mixed ketone process where MiBK, diisobutyl ketone, and acetone are coproduced in a single reaction using isopropanol as a starting material. The second method is used to produce the majority of MiBK and involves a three-step reaction sequence in which diacetone alcohol and mesityl oxide are formed as intermediates.

• synthetische

  By hydrogenation of mesityl oxide over Ni at 160 to 190°C; also by oxidation of methyl isobutyl carbinol.

• Definition

  ChEBI: Methyl isobutyl ketone is a ketone.

• Aroma threshold values

  Detection: 240 to 640 ppb

• Taste threshold values

  Taste characteristics at 25 ppm: sweet, ethereal, banana and fruity with dairy nuances

• Synthesis Reference(s)

  Journal of the American Chemical Society, 100, p. 5437, 1978 DOI: 10.1021/ja00485a031
  Tetrahedron Letters, 36, p. 2285, 1995 DOI: 10.1016/0040-4039(95)00191-E
  Tetrahedron, 37, p. 3073, 1981 DOI: 10.1016/S0040-4020(01)98839-8

• Allgemeine Beschreibung

  A clear colorless liquid with a pleasant odor. Flash point 73°F. Less dense than water. Vapors heavier than air.

• Air & Water Reaktionen

  Highly flammable. 4-Methyl-2-pentanone is sensitive to air (may form explosive peroxides). Slightly soluble in water.

• Reaktivität anzeigen

  4-Methyl-2-pentanone is incompatible with caustic soda and other strong alkalis, hydrochloric acid, sulfuric acid and other strong inorganic acids, amines and oxidizing agents such as hydrogen peroxide, nitric acid, perchloric acid and chromium trioxide. 4-Methyl-2-pentanone reacts violently with potassium tert-butoxide. 4-Methyl-2-pentanone reacts vigorously with reducing materials. .

• Hazard

  Flammable, dangerous fire risk, explosivelimits in air 1.4–7.5%. Avoid ingestion and inhala-tion. Upper respiratory tract irritant, dizziness, andheadache. Possible carcinogen.

• Health Hazard

  Vapor causes irritation of eyes and nose; high concentrations cause anesthesia and depression. Liquid dries out skin and may cause dermatitis; irritates eyes but does not injure them.

• Health Hazard

  MIBK exhibits low to moderate toxicity.It is more toxic than acetone. Exposureto 200 ppm can cause irritation of theeyes, mucous membranes, and skin. Prolonged skin contact can leach out fat fromthe skin. Exposure to high concentrationscan cause nausea, headache, and narcosis. Animal studies indicate that this compound could probably cause kidney damage,with symptoms of a heavier kidney, higherkidney-to-body weight ratio, and tubularnecrosis. An increase in liver weight wasnoted, too, associated with its exposure inanimal subjects. In male rats the effect wasobserved at 2000 ppm on 2 weeks’ exposure(6 hours/day) (Phillips et al. 1987). Otherthan for the male rat kidney effect, the levelsup to 1000 ppm for 14 weeks had no significant toxicological effect. In another study,exposure to 3000 ppm in rats and mice wasfound to cause increased liver and kidneyweights, decrease in food consumption, incidence of dead fetuses, and reduced fetal bodyweight (Tyl et al. 1987).
  Ingestion of MIBK can result in narcosis and coma. A genetic toxicology studyof MIBK showed a negative response inthe bacterial mutation assays and the yeastmitotic gene conversion assay (Brooks et al.1988).
  LD50 value, oral (rat): 2080 mg/kg
  LD50 value, intraperitoneal (rat): 400 mg/kg.

• Flammability and Explosibility

  Highly flammable

• Chemische Reaktivität

  Reactivity with Water No reaction; 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.

• mögliche Exposition

  MIBK is used as a solvent; a denaturant; and as an extractant; in the manufacture of methyl amyl alcohol; as a solvent in paints, varnishes, and lacquers; as an alcohol denaturant; as a solvent in uranium extraction from fission products.

• Erste Hilfe

  If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts theskin, remove contaminated clothing and wash immediatelywith soap and water. Seek medical attention immediately. Ifthis chemical has been inhaled, remove from exposure,begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR ifheart action has stopped. Transfer promptly to a medicalfacility. When this chemical has been swallowed, get medical attention. Give large quantities of water and inducevomiting. Do not make an unconscious person vomit.

• Carcinogenicity

  The National Toxicology Program conducted cancer bioassays by exposing groups of 50 male and 50 female F344 rats and B6C3F1 mice to MiBK vapor at 0, 450, 900, or 1800 ppm 6h/day, 5 days/ week for 2 years. Survival and body weight gain were decreased in male rats at 1800 ppm. Body weight gain was also decreased in male rats at 900 and in female mice at 1800ppm. A higher incidence of mineralization of the renal papilla was observed in male rats at all MiBK exposure levels. Chronic progressive nephropathy (CPN) and the incidences of adenoma and adenoma or carcinoma (combined) were increased for the male 1800 ppm exposure group. The severity of CPN and renal tubular hyperplasia was increased in all male rat exposure groups. An uncertain increase in mononuclear cell leukemia, adrenal medulla hyperplasia, and a positive trend for increases in benign or malignant pheochromocytomas (combined) were reported for the 1800 ppm male group. The NTP considered that there was some evidence of carcinogenic activity in male rats based on increased incidences of renal tubule neoplasms.
  None of the rodent bioassay results were considered clear evidence of carcinogenicity by NTP.

• Environmental Fate

  Biological. Bridié et al. (1979) reported BOD and COD values of 2.06 and 2.16 g/g using filtered effluent from a biological sanitary waste treatment plant. These values were determined using a standard dilution method at 20 °C and stirred for a period of 5 d. Heukelekian and Rand (1955) reported a 5-d BOD value of 1.51 g/g which is 55.5% of the ThOD value of 2.72 g/g.
  Photolytic. When synthetic air containing gaseous nitrous acid and 4-methyl-2-pentanone was exposed to artificial sunlight (λ = 300–450 nm), photooxidation products identified were acetone, peroxyacetal nitrate, and methyl nitrate (Cox et al., 1980). In a subsequent experiment, the OHinitiated photooxidation of 4-methyl-2-pentanone in a smog chamber produced acetone (90% yield) and peroxyacetal nitrate (Cox et al., 1981). Irradiation at 3130 ? resulted in the formation of acetone, propyldiene, and free radicals (Calvert and Pitts, 1966).
  Second-order photooxidation rate constants for the reaction of 4-methyl-2-butanone and OH radicals in the atmosphere are 1.4 x 10^-10, 1.42 x 10^-10, and 1.32 x 10^-10 cm³/molecule?sec at 295, 299, and 300 K, respectively (Atkinson, 1985). The atmospheric lifetime was estimated to be 1–5 d (Kelly et al., 1994).
  Photolytic. Cox et al. (1980) reported a rate constant of 1.24 x 10^-11 cm³/molecule?sec for the reaction of gaseous 4-methyl-2-pentanone with OH radicals based on a value of 8 x 10^-12 cm³/molecule?sec for the reaction of ethylene with OH radicals.
  Chemical/Physical. 4-Methyl-2-pentanone will not hydrolyze in water because it does not contain a hydrolyzable functional group (Kollig, 1993).

• Lager

  Color Code—Red: Flammability Hazard: Store ina flammable liquid storage area or approved cabinet awayfrom ignition sources and corrosive and reactive materials.Prior to working with this chemical you should be trainedon its proper handling and storage. Before entering confinedspace where this chemical may be present, check to makesure that an explosive concentration does not exist. Methylisobutyl ketone must be stored to avoid contact with strongoxidizers because violent reactions occur. Store in tightlyclosed containers in a cool, well-ventilated area away fromheat, sparks, and flames. Sources of ignition, such as smoking and open flames, are prohibited where methyl isobutylketone is used, handled, or stored in a manner that couldcrate a potential fire or explosion hazard. Metal containersinvolving the transfer of 5 gallons or more of methyl isobutyl ketone should be grounded and bonded. Drums must beequipped with self-closing valves, pressure vacuum bungs,and flame arresters. Use only nonsparking tools and equipment, especially when opening and closing containers ofmethyl isobutyl ketone.

• Versand/Shipping

  UN1245 Methyl isobutyl ketone, Hazard Class: 3; Labels: 3-Flammable liquid.

• läuterung methode

  Reflux the ketone with a little KMnO4, wash it with aqueous NaHCO3, dry with CaSO4 and distil it. Acidic impurities are removed by passage through a small column of activated alumina. [Beilstein 1 IV 3305.]

• Inkompatibilitäten

  Able to form unstable and explosive peroxides on contact with air. Reacts violently with strong oxidizers, potassium tert-butoxide; strong acids; aliphatic amines; reducing agents

• Waste disposal

  Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform to EPA regulations governing storage, transportation, treatment, and waste disposal. Incineration.

4-Methyl-2-pentanone Upstream-Materialien And Downstream Produkte

4-Methylpentan-2-on Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

Global(956)Suppliers

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