1,2,3-Trimethylbenzol

Bezeichnung:1,2,3-Trimethylbenzol

CAS-Nr526-73-8

Englisch Name:1,2,3-Trimethylbenzene

CBNumberCB6853732

SummenformelC9H12

Molgewicht120.19

MOL-Datei526-73-8.mol

Synonyma

1,2,3-Trimethylbenzol

Hemimelliten

Hemellitol

1,2,3-Trimethylbenzol physikalisch-chemischer Eigenschaften

Schmelzpunkt	−25 °C(lit.)
Siedepunkt	175-176 °C(lit.)
Dichte	0.894 g/mL at 25 °C(lit.)
Dampfdichte	4.15 (vs air)
Dampfdruck	3.4 mm Hg ( 37.7 °C)
Brechungsindex	n20/D 1.513(lit.)
Flammpunkt	119 °F
Löslichkeit	Soluble in acetone, alcohol, benzene, and ether (Weast, 1986)
pka	>14 (Schwarzenbach et al., 1993)
Farbe	Colorless to Light yellow
Odor Threshold	0.032ppm
Wasserlöslichkeit	65.51mg/L(25 ºC)
BRN	1903410
Henry's Law Constant	3.18 at 25 °C (approximate - calculated from water solubility and vapor pressure)
Expositionsgrenzwerte	NIOSH REL: TWA 25 ppm (125 mg/m³); ACGIH TLV: TWA for mixed isomers 25 ppm (adopted).
Dielectric constant	2.6600000000000001
Stabilität	Stable. Flammable. Incompatible with strong oxidizing agents.
LogP	3.660
CAS Datenbank	526-73-8(CAS DataBase Reference)
NIST chemische Informationen	Benzene, 1,2,3-trimethyl-(526-73-8)
EPA chemische Informationen	1,2,3-Trimethylbenzene (526-73-8)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	10-37-36/37/38
S-Sätze:	16-26
RIDADR	UN 3295 3/PG 3
OEB	A
OEL	TWA: 25 ppm (125 mg/m3)
WGK Germany	3
RTECS-Nr.	DC3300000
Selbstentzündungstemperatur	878 °F
HazardClass	3.2
PackingGroup	III
HS Code	2902900000
Giftige Stoffe Daten	526-73-8(Hazardous Substances Data)

Gefahreninformationscode (GHS)

1,2,3-Trimethylbenzene Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD
FARBLOSE FLüSSIGKEIT MIT CHARAKTERISTISCHEM GERUCH.
CHEMISCHE GEFAHREN
Reagiert mit Oxidationsmitteln unter Feuer- und Explosionsgefahr.
ARBEITSPLATZGRENZWERTE
TLV: 25 ppm (als TWA); (ACGIH 2005).>
AUFNAHMEWEGE
Aufnahme in den Körper durch Inhalation.
INHALATIONSGEFAHREN
Beim Verdampfen bei 20°C tritt langsam eine gesundheitsschädliche Kontamination der Luft ein.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION:
Die Substanz reizt die Augen, die Haut und die Atemwege. Möglich sind Auswirkungen auf das Zentralnervensystem. Verschlucken kann zur Aufnahme in der Lunge führen; Gefahr der Aspirationspneumonie.
LECKAGE
Ausgelaufene Flüssigkeit in abgedeckten Behältern sammeln. Reste mit Sand oder inertem Absorptionsmittel aufnehmen und an einen sicheren Ort bringen. NICHT in die Kanalisation spülen.
R-Sätze Betriebsanweisung:
R10:Entzündlich.
R37:Reizt die Atmungsorgane.
S-Sätze Betriebsanweisung:
S16:Von Zündquellen fernhalten - Nicht rauchen.
Chemische Eigenschaften
Trimethylbenzenes exists in three isomeric forms. All isomers are clear, colorless liquids with a distinctive, aromatic odor.
Chemische Eigenschaften
colourless liquid
Physikalische Eigenschaften
Clear, colorless, flammable liquid with an aromatic odor similar to propylbenzene, ethylbenzenes, or xylenes.
Verwenden
Raw material for chemical synthesis.
Definition
ChEBI: A trimethylbenzene carrying methyl groups at positions 1, 2 and 3. It has been found in Centaurium erythraea.
Synthesis Reference(s)
Journal of the American Chemical Society, 62, p. 2639, 1940 DOI: 10.1021/ja01867a017
Organic Syntheses, Coll. Vol. 4, p. 508, 1963
Hazard
Combustible. Central nervous system impairment, asthma, and hematologic effects.
Sicherheitsprofil
Mildly toxic by ingestion, Flammable liquid when exposed to heat, sparks, or flame. To fight fire, use water spray, mist, dry chemical, CO2, foam. When heated to decomposition it emits acrid smoke and irritating fumes.
mögliche Exposition
(1,2,3-and 1,2,4-isomers): These materials are used as solvents and in dye and perfume manufacture. The 1,2,3-isomer is used as raw material in chemical synthesis and as an UV stabilizer. The 1,2,4-isomer is used as the raw material for trimellitic anhydride manufacture. These compounds are found in diesel engine exhaust fumes.
Source
Detected in distilled water-soluble fractions of 87 octane gasoline (0.30 mg/L), 94 octane gasoline (0.81 mg/L), Gasohol (0.80 mg/L), No. 2 fuel oil (0.22 mg/L), diesel fuel (0.09 mg/L), and military jet fuel JP-4 (0.19 mg/L) (Potter, 1996).
Thomas and Delfino (1991) equilibrated contaminant-free groundwater collected from Gainesville, FL with individual fractions of three individual petroleum products at 24–25 °C for 24 h. The aqueous phase was analyzed for organic compounds via U.S. EPA approved test method 602. Average 1,2,3-trimethylbenzene concentrations detected in water-soluble fractions of unleaded gasoline, kerosene, and diesel fuel were 1.219, 0.405, and 0.118 mg/L, respectively.
When the authors analyzed the aqueous-phase via U.S. EPA approved test method 610, average 1,2,3-trimethylbenzene concentrations in water-soluble fractions of unleaded gasoline, kerosene, and diesel fuel were smaller, i.e., 742, 291, and 105 μg/L, respectively.
Environmental Fate
Photolytic. Glyoxal, methylglyoxal, and biacetyl were produced from the photooxidation of 1,2,3-trimethylbenzene by OH radicals in air at 25 °C (Tuazon et al., 1986a). The rate constant for the reaction of 1,2,3-trimethylbenzene and OH radicals at room temperature was 1.53 x 10^-11 cm³/molecule?sec (Hansen et al., 1975). A rate constant of 1.49 x 10^-8 L/molecule?sec was reported for the reaction of 1,2,3-trimethylbenzene with OH radicals in the gas phase (Darnall et al., 1976). Similarly, a room temperature rate constant of 3.16 x 10^-11 cm³/molecule?sec was reported for the vapor-phase reaction of 1,2,3-trimethylbenzene with OH radicals (Atkinson, 1985). At 25 °C, a rate constant of 2.69 x 10^-11 cm³/molecule?sec was reported for the same reaction (Ohta and Ohyama, 1985). 2,3-Butanedione was the only products identified from the OH radical-initiated reaction of 1,2,4-trimethylbenzene in the presence of nitrogen dioxide. The amount of 2,3- butanedione formed decreased with increased concentration of nitrogen dioxide (Bethel et al., 2000).
Chemical/Physical. 1,2,3-Trimethylbenzene will not hydrolyze because it does not contain a hydrolyzable group (Kollig, 1993).
Versand/Shipping
UN3295 Hydrocarbons, liquid, n.o.s., Hazard Class: 3; Labels: 3-Flammable liquid. UN1993 Flammable liquids, n.o.s., Hazard Class: 3; Labels: 3-Flammable liquid, Technical Name Required. 1,3,5-Trimethylbenzene; UN2325, Hazard Class: 3; Labels: 3-Flammable liquid. 1,2,4-Trimethylbenzene:
Inkompatibilitäten
Vapors 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.
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.

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