2-Naphthol

Gefahreninformationscode (GHS)

• Bildanzeige (GHS)

  

• Alarmwort

  Achtung

• Gefahrenhinweise

  H317：Kann allergische Hautreaktionen verursachen.

  H318：Verursacht schwere Augenschäden.

  H400：Sehr giftig für Wasserorganismen.

• Sicherheit

  P273：Freisetzung in die Umwelt vermeiden.

  P280：Schutzhandschuhe/Schutzkleidung/Augenschutz tragen.

  P301+P312：BEI VERSCHLUCKEN: Bei Unwohlsein GIFTINFORMATIONSZENTRUM/Arzt/... (geeignete Stelle für medizinische Notfallversorgung vom Hersteller/Lieferanten anzugeben) anrufen.

  P302+P352：BEI BERÜHRUNG MIT DER HAUT: Mit viel Wasser/... (Hersteller kann, falls zweckmäßig, ein Reinigungsmittel angeben oder, wenn Wasser eindeutig ungeeignet ist, ein alternatives Mittel empfehlen) waschen.

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

2-Naphthol Chemische Eigenschaften,Einsatz,Produktion Methoden

• ERSCHEINUNGSBILD

  WEISSE BIS GELBLICHWEISSE KRISTALLE MIT CHARAKTERISTISCHEM GERUCH.

• PHYSIKALISCHE GEFAHREN

  Staubexplosion der pulverisierten oder granulierten Substanz in Gemischen mit Luft möglich.

• ARBEITSPLATZGRENZWERTE

  TLV nicht festgelegt (ACGIH 2005).
  MAK nicht festgelegt (DFG 2005).
  

• AUFNAHMEWEGE

  Aufnahme in den Körper durch Inhalation des Aerosols, über die Haut und durch Verschlucken.

• INHALATIONSGEFAHREN

  Eine gesundheitsschädliche Partikelkonzentration in der Luft kann beim Dispergieren schnell erreicht werden.

• WIRKUNGEN BEI KURZZEITEXPOSITION

  WIRKUNGEN BEI KURZZEITEXPOSITION:
  Die Substanz reizt stark die Augen.

• WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION

  Wiederholter oder andauernder Kontakt kann zu Hautsensibilisierung führen. Möglich sind Auswirkungen auf Nieren, Blut und Augen mit nachfolgenden Nierenschäden, Blutarmut und Linsentrübungen.

• LECKAGE

  Persönliche Schutzausrüstung: Atemschutzgerät, P2-Filter für schädliche Partikel. Verschüttetes Material in Behältern sammeln; falls erforderlich durch Anfeuchten Staubentwicklung verhindern. NICHT in die Umwelt gelangen lassen.

• R-Sätze Betriebsanweisung:

  R20/22:Gesundheitsschädlich beim Einatmen und Verschlucken.
  R50:Sehr giftig für Wasserorganismen.

• S-Sätze Betriebsanweisung:

  S24/25:Berührung mit den Augen und der Haut vermeiden.
  S61:Freisetzung in die Umwelt vermeiden. Besondere Anweisungen einholen/Sicherheitsdatenblatt zu Rate ziehen.

• Aussehen Eigenschaften

  C10H7O. Hellgraues Pulver mit aromatischem Geruch, dunkelt beim Lagern nach.

• Gefahren für Mensch und Umwelt

  Gesundheitsschädlich beim Einatmen und Verschlucken.
  LD50 (oral, Ratte): 1960mg/kg

• Schutzmaßnahmen und Verhaltensregeln

  Schutzhandschuhe aus Neopren als kurzzeitiger Staubschutz.

• Verhalten im Gefahrfall

  Trocken aufnehmen, dabei Staubentwicklung vermeiden. In gut verschließbaren Behältern der Entsorgung zuführen.
  Wassernebel, Kohlendioxid, Schaum, Pulver.

• Erste Hilfe

  Nach Hautkontakt: Sofort mit Wasser und Seife abwaschen.
  Nach Augenkontakt: Gründlich mit viel Wasser und geöffnetem Lidspalt mindesten 10 Minuten spülen und Arzt konsultieren.
  Nach Einatmen: Den Betroffenen an die frische Luft bringen und ruhig lagern.
  Nach Verschlucken: Wasser trinken lassen. Kein Erbrechen einleiten. Sofort Arzt hinzuziehen.
  Nach Kleidungskontakt: Verunreinigte Kleidung sofort ausziehen.
  Ersthelfer: siehe gesonderten Anschlag

• Sachgerechte Entsorgung

  Laborchemikalienabfälle.

• Chemische Eigenschaften

  2-Naphthol is a white, crystalline solid. Slight phenolic odor. Darkens in air and on exposure to light. 2-Naphthol [135-19-3] b-naphthol, 2- naphthalenol, 2-hydroxynaphthalene, C10H8O, Mr 144.16, forms colorless plates upon sublimation, which darken on exposure to air or light. Unlike 1-naphthol it is nonvolatile in steam. 2-Naphthol is reduced with sodium or with hydrogen in the presence of a catalyst to give mainly 1,2,3,4-tetrahydro-2-naphthol (unlike 1- naphthol which gives the arylphenol under the same conditions). 

• Physikalische Eigenschaften

  White glossy flakes or white powder. Insoluble in water, soluble in ethanol, ether, chloroform, glycerol and alkali solution.

• Verwenden

  Has been used as antiseptic, anthelmintic and counter-irritant in alopecia.

• Verwenden

  2-Naphthol is used in the manufacture of dyes, perfumes, and medicinal organics, and in the production of antioxidants for synthetic rubber.

• Application

  It is used to produce Tobias acid, J acid, 2-hydroxy-3-naphthoic acid and azo dyes, and it is the raw material for rubber antioxidants, mineral dressing agents, fungicides, antiseptics, preservatives, etc.
  As feed preservative. In China, it can be used for citrus preservation, the maximum dosage amount is 0.1 g/kg and the residue amount should be no more than 70 mg/kg.
  2-Naphthol, also called β-naphthol, 2-naphthalenol, is the intermediate for plant growth regulator, 2-naphthoxyacetic acid.
  As analytic agent, absorbent of ethylene and carbon monoxide, and fluorescence indicator.
  Important organic raw material and dye intermediate, used to produce Tobias acid, butyric acid, β-hydroxynaphthoic acid and used to produce N-phenyl-2-naphthylamine, Diafen NN and other antioxidant, organic pigments, and fungicides.
  For the detection of bromine, chlorine, chlorate, niobium, copper, nitrite, and potassium. Substrate for fluorometric assay of phenol sulfotransferase. Acid and alkali indicator, dyes, organic synthesis, qualitative determination of allyl alcohol, methanol, chloroform, etc. Absorbent of carbon monoxide, ethanol, and fluorescence indicator. Determination of carbon monoxide, copper, nitrite, and potassium. Ethylene absorbent.

• Definition

  ChEBI: 2-naphthol is a naphthol carrying a hydroxy group at position 2. It has a role as an antinematodal drug, a genotoxin, a human xenobiotic metabolite, a mouse metabolite, a human urinary metabolite and a radical scavenger.

• synthetische

  2-Naphthol is produced by caustic fusion of naphthalene-2-sulfonic acid. Typically, the sodium salt of the sulfonic acid is added gradually to 50 % sodium hydroxide liquor at 300℃; the melt is then heated further at 320℃ in a gas-fired iron vessel with vigorous agitation. After completion of the reaction, the melt is run into excess water, possibly including filtrate from the previous batch at a proven tolerable level, and the naphtholate solution is neutralized to pH 8 with dilute sulfuric acid. If the temperature is maintained at >100℃ during neutralization, the crude product comes out of solution as an oil, which is separated, washed with hot water, and distilled under vacuum to give pure 2-naphthol. The molten material is processed through a flaker to give the final product for packaging. The fusion yield is about 80 % of the theoretical value, resulting in an overall yield of 70 % based on naphthalene. Typical specifications for 2-naphthol are clear solution in dilute caustic soda,  mp 120.5℃, and 1-naphthol content<0.3 %.
  

• Reaktionen

  2-Naphthol is naphthalene homologues of phenol, with the hydroxyl group being more reactive than in the phenols.2-Naphthol converts to 2-naphthalenethiol by reaction with dimethylthiocarbamoyl chloride via the Newman–Kwart rearrangement.

• Synthesis Reference(s)

  Journal of the American Chemical Society, 72, p. 4884, 1950 DOI: 10.1021/ja01167a009
  Synthesis, p. 437, 1985 DOI: 10.1055/s-1985-31235

• Allgemeine Beschreibung

  2-Naphthol is a hydroxyarene molecule, which when electronically excited forms strong acid. Excited 2-Naphthol dissociates only in water. It has a slight phenolic odor. It is incompatible with strong oxidizing agents, strong bases, acid chlorides and acid anhydrides. It is one of the most commonly used fluorescence dye.

• Health Hazard

  Although the toxicity of 2-naphthol is of low order in test animals, ingestion of large amounts may result in nausea, vomiting, diarrhea, abdominal pain, convulsions, and hemolytic anemia. Death may result from respiratory failure. The oral LD50 value in rats is in the range 2000 mg/kg. 2-Naphthol is slightly more toxic than 1-naphthol [9015-3], the oral LD50 value of which is in the range 2500 mg/kg.
  Skin contact can produce peeling of the skin and pigmentation.

• Brandgefahr

  Noncombustible solid.

• Chemische Reaktivität

  2-naphthol can be oxidation with ferric chloride forms 2,20 -dihydroxy-1,10 -binaphthyl, with any blue coloration indicating the presence of 1- naphthol.
  Air oxidation at 300℃ with a vanadium pentoxide catalyst also yields 1,10 -bi-2-naphthol, which dehydrates at higher temperature to the oxide and finally decomposes to give benzoic acid.
  2-naphthol can reacte with phosphorus pentachloride at 150℃ gives 2-chloronaphthalene or at lower temperature, tri-2-naphthyl phosphate (mp 111℃), which can be isolated after treatment of the reaction mixture with alkali.
  Reaction with one equivalent of bromine in acetic acid gives 1-bromo-2-naphthol, whereas excess bromine yields 1,6-dibromo-2-naphthol. The latter is readily debrominated in dilute mineral acid to yield 6-bromo-2-naphthol. 

• Sicherheitsprofil

  Poison by ingestion, inhalation, and subcutaneous routes. Mutation data reported. A skin and eye irritant. Combustible when exposed to heat or flame. To fight fire, use CO2, dry chemical. Incompatible with antipyrine, camphor, phenol, ferric salts, menthol, potassium permanganate and other oxidzing materials, urethane.

• mögliche Exposition

  A potential danger to those involved in rubber antioxidant production, synthesis of dyes; leather processing; fungicides, pharmaceuticals, and perfumes. Used as an antioxidant for fats, oils; as an antiseptic; in insecticides.

• Versand/Shipping

  UN2811 Toxic solids, organic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required. UN3077 Environmentally hazardous substances, solid, n.o.s., Hazard Class: 9; Labels: 9-Miscellaneous hazardous material, Technical Name Required.

• läuterung methode

  Crystallise 2-naphthol from aqueous 25% EtOH (charcoal), H2O, *benzene, toluene or CCl4. Alternatively, extract it repeatedly with small amounts of EtOH, followed by dissolution in a minimum volume of EtOH and precipitation with distilled water, then drying over P2O5 under vacuum. It has also been dissolved in aqueous NaOH and precipitated by adding acid (repeat several times), then precipitated from *benzene by addition of heptane. Final purification can be by zone melting or sublimation in vacuo. The 4-nitrobenzoate has m 104o (from EtOH). [Bardez et al. J Phys Chem 89 5031 1985, Kikuchi et al. J Phys Chem 91 574 1987, Beilstein 6 IV 4253.]

• Properties and Applications

  white crystalline, with phenol smell. Industrial goods for hoar chip or powder. Melting point 121 ~ 123 ℃, 285 ℃ ~ 286 boiling point, flash point 161 ℃. This product soluble in water, ethanol, ethyl ether, chloroform, glycerin and alkali solution, can the sublimation, with steam evaporate out; Long storage or light color in turn dark, can happen oxidation, reduction, nitrification and nitrosation reaction, and products, light and heat, halogenating role, etc.

• Inkompatibilitäten

  Dust or powder may form explosive mixture with air. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides, iron salts; 2,3-dimethyl-1- phenyl-3-pyrazolin-5-one (antipyrine); camphor, phenol, menthol, urethane.

• Waste disposal

  Mix with flammable solvent and atomize into an incinerator.

2-Naphthol Upstream-Materialien And Downstream Produkte

2-Naphthol Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

Global(834)Suppliers

135-19-3, 2-Naphthol Verwandte Suche: