Dimethyldisulfid

Bezeichnung:Dimethyldisulfid

CAS-Nr624-92-0

Englisch Name:Dimethyl disulfide

CBNumberCB8229876

SummenformelC2H6S2

Molgewicht94.2

MOL-Datei624-92-0.mol

Synonyma

Dimethyldisulfid

Methyldisulfid

Methyldithiomethan

Dimethyldisulfid physikalisch-chemischer Eigenschaften

Schmelzpunkt	-85 °C
Siedepunkt	109 °C(lit.)
Dichte	1.0625
Dampfdichte	3.24 (vs air)
Dampfdruck	22 mm Hg ( 20 °C)
Brechungsindex	n20/D 1.525(lit.)
FEMA	3536 \| DIMETHYL DISULFIDE
Flammpunkt	76 °F
storage temp.	Flammables area
Löslichkeit	2.7g/l
Aggregatzustand	Liquid
Wichte	1.0647 (20/4℃)
Farbe	Clear yellow
Geruch (Odor)	at 0.10 % in propylene glycol. sulfurous vegetable cabbage onion
Geruchsart	sulfurous
Explosionsgrenze	1.1-16.1%(V)
Odor Threshold	0.0022ppm
Wasserlöslichkeit	<0.1 g/100 mL at 20 ºC
JECFA Number	564
BRN	1730824
Expositionsgrenzwerte	ACGIH: TWA 0.5 ppm (Skin)
Dielectric constant	9.7699999999999996
Stabilität	Stable. Incompatible with strong bases, strong oxidizing agents, strong reducing agents. Flammable.
InChIKey	WQOXQRCZOLPYPM-UHFFFAOYSA-N
LogP	1.91 at 20℃
CAS Datenbank	624-92-0(CAS DataBase Reference)
NIST chemische Informationen	Disulfide, dimethyl(624-92-0)
EPA chemische Informationen	Methyl disulfide (624-92-0)

Sicherheit

Kennzeichnung gefährlicher	F,Xn,N,T+
R-Sätze:	11-20/22-36-51/53-36/37/38-26-22-36/37
S-Sätze:	26-61-45-38-36/37/39-28A-16-60-57-39-29
RIDADR	UN 2381 3/PG 2
WGK Germany	2
RTECS-Nr.	JO1927500
Selbstentzündungstemperatur	304 °C
TSCA	Yes
HazardClass	3
PackingGroup	II
HS Code	29309070
Giftige Stoffe Daten	624-92-0(Hazardous Substances Data)
Toxizität	LD50 orally in Rabbit: 290 - 500 mg/kg

Gefahreninformationscode (GHS)

Dimethyl disulfide Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD
FLüSSIGKEIT MIT CHARAKTERISTISCHEM GERUCH.
CHEMISCHE GEFAHREN
Zersetzung beim Verbrennen unter Bildung giftiger und ätzender Rauche mit Schwefeloxiden. Reagiert sehr heftig mit Oxidationsmitteln.
ARBEITSPLATZGRENZWERTE
TLV: 0.5 ppm (als TWA); Hautresorption (ACGIH 2008).
MAK nicht festgelegt.
AUFNAHMEWEGE
Aufnahme in den Körper durch Inhalation und durch Verschlucken.
INHALATIONSGEFAHREN
Nur ungenügende Angaben vorhanden über die Geschwindigkeit, mit der eine gesundheitsschädliche Konzentration in der Luft beim Verdampfen bei 20°C erreicht wird.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION:
Die Substanz reizt leicht die Haut und reizt die Augen und die Atemwege. Möglich sind Auswirkungen auf das Zentralnervensystem.
LECKAGE
Gefahrenbereich verlassen! Fachmann zu Rate ziehen! Persönliche Schutzausrüstung: Atemschutzfilter für organische Gase und Dämpfe. Belüftung. Zündquellen entfernen. Ausgelaufene Flüssigkeit in abdichtbaren Behältern sammeln.
R-Sätze Betriebsanweisung:
R11:Leichtentzündlich.
R20/22:Gesundheitsschädlich beim Einatmen und Verschlucken.
R36:Reizt die Augen.
R51/53:Giftig für Wasserorganismen, kann in Gewässern längerfristig schädliche Wirkungen haben.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
R26:Sehr giftig beim Einatmen.
R22:Gesundheitsschädlich beim Verschlucken.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S61:Freisetzung in die Umwelt vermeiden. Besondere Anweisungen einholen/Sicherheitsdatenblatt zu Rate ziehen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
S38:Bei unzureichender Belüftung Atemschutzgerät anlegen.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S16:Von Zündquellen fernhalten - Nicht rauchen.
S60:Dieses Produkt und sein Behälter sind als gefährlicher Abfall zu entsorgen.
Beschreibung
Dimethyl disulfide has a diffuse intense onion odor. It is nonlachrymatory. Ironically, although many find its odor objectionable at high concentrations as noted above, when diluted, its aroma has also been described as pleasant. Dimethyl disulfide is often used in combination with other flavor compounds in food products, including baked goods, cheese, frozen dairy products, meat products, soups, savory flavors, fruit flavors, soft candy, gelatin, puddings, and both alcoholic and nonalcoholic beverages.
Chemische Eigenschaften
colourless to yellow liquid with a very unpleasant smell, insoluble in water, Soluble in ethanol, ethyl ether and acetic acid. It is a strong odor component irritant which is also included in garlic and has been designated as a specific malodorous substances based on the Offensive Odor Control Law. Its detection threshold shows 0.002 ppm, which senses a low concentration equivalent to Dimethyl sulfide.
Occurrence
Reported found in sour cherry, guava, melon, peach, pineapple, strawberry, cabbage, kohlrabi, onion, garlic, shallot, leek, chive, peas, potato, rutabaga, tomato, parsley, breads, many cheeses, yogurt, milk, egg, fish, meats, hop oil, beer, Scotch whiskey, cognac, grape wines, cocoa, coffee, peanut, peanut butter, pecan, potato chips, oats, soybean, beans, mushrooms, trassi, macadamia nut, mango, cauliflower, broccoli, brussels sprouts, rice, radish, sukiyaki, sake, watercress, malt, wort, krill, southern pea, loquat, sapodilla, shrimp, oyster, crab, crayfish, clam, scallops and squid.
Verwenden
Industrially, Dimethyl disulfide is also used as a sulfiding agent to catalyze reactions in oil refineries and other industries. It has a low flash point of 16 ℃ (61 °F) that presents fire hazards during refinery usage. Due to its strong odor and low flash point, Dimethyl disulfide typically requires storage under nitrogen pressure in closed containers.
Dimethyl disulfide has a sulfurous odor similar to that of garlic and decaying fish. Because of the distinctive odor of sulfur compounds, similar to DMDS, they are often added to natural gas and propane to warn of leaks and protect people. Therefore, the odor of a DMDS fumigation can be mistaken for a gas leak. DMDS has an odor threshold of approximately 7 ppb, which is about 8 times less than the health‐based level considered by the EPA to be safe (55 ppb).
Verwenden
Dimethyl disulfide is used as an intermediate as well as a food additive in onion, garlic, cheese, meats, soups, savory flavors and fruit flavors. It is used in oil refineries as a sulfiding agent. It is used to alfa substitute 2-methylfuran-acrolein to produce food stuff. It is involved in the preparation of 4-(methylthio)phenol. Further, it is used to replace methyl mercaptan as a jet fuel additive. It finds application in artificial flavoring agent and a corrosion inhibitor. In addition to this, it serves as an effective soil fumigant in agriculture.
synthetische
Dimethyl disulfide can be prepared by the reaction between imethyl sulfate and sodium sulfide. under stirring, sulfur powder was added into sodium sulfide solution. The above reaction system was heated Up to 80-90℃, after reaction for 1 h, cooled to about 30 ℃. Dimethyl sulfate was dropped into the reaction system and the reaction was continued for 2h. Then, distillation, stratification, Separating waste alkali liquor, then through distillation and final products are prepared.
In industry,dimethyl sulfate method is adopted to synthesize dimethyl disulfide.
Na2S+S→Na2S2Na2S2+(CH3)2SO4→CH3SSCH3+Na2SO4
From magnesium methyl iodide and S2Cl2, or from S2S2 and sodium methyl sulfate; also from methyl bromide and sodium thiosulfate, after which the resulting sodium methylthiosulfate is heated to yield dimethyl disulfide.
Definition
ChEBI: Dimethyl disulfide is an organic disulfide that is methane in which one of the hydrogens has been replaced by a methyldisulfanyl group. It has a role as a xenobiotic metabolite.
Aroma threshold values
Detection: 0.16 to 1.2 ppb. Recognition: 90 ppb
Allgemeine Beschreibung
A colorless oily liquid with a garlic-like odor. Denser than water and slightly soluble in water. Flash point 40°F. Vapors heavier than air. May irritate skin and eyes. Used to make other chemicals.
Air & Water Reaktionen
Highly flammable. Slightly soluble in water.
Reaktivität anzeigen
DMDS is a reducing agent. A dangerous fire hazard when exposed to oxidizing materials. Emits toxic fumes of oxides of sulfur when heated to decomposition or on contact with acids [Sax, 9th ed., 1996, p. 1320].
Health Hazard
May cause toxic effects if inhaled or absorbed through skin. Inhalation or contact with material may irritate or burn skin and eyes. Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.
Brandgefahr
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.
Flammability and Explosibility
Highly flammable
Sicherheitsprofil
Poison by inhalation. A very dangerous fire hazard when exposed to heat, flame, or oxidzers. Can react vigorously with oxiduing materials. See also SULFIDES.
mögliche Exposition
PrimaryIrritant. This material may be used as an organicintermediate
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.
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 Dimethyl disulfide you should betrained on its proper handling and storage. Before enteringconfined space where this chemical may be present, checkto make sure that an explosive concentration does not exist.Store in tightly closed containers in a cool, well-ventilatedarea away from any form of moisture, oxidizers, acids.Metal containers involving the transfer of this chemicalshould be grounded and bonded. Where possible, automatically pump liquid from drums or other storage containers toprocess containers. Drums must be equipped with self-closing valves, pressure vacuum bungs, and flame arresters. Useonly nonsparking tools and equipment, especially whenopening and closing containers of this chemical. Sources ofignition, such as smoking and open flames, are prohibitedwhere this chemical is used, handled, or stored in a mannerthat could create a potential fire or explosion hazard.Wherever this chemical is used, handled, manufactured, orstored, use explosion-proof electrical equipment andfittings.
Versand/Shipping
This compound requires a shipping label of“FLAMMABLE LIQUID.” It falls in Hazard Class 3 andPacking Group II.
läuterung methode
Pass it through neutral alumina before use. [Trost Chem Rev 78 363 1978, Beilstein 1 IV 1281.]
Toxicity evaluation
Very little information is available on mechanism of toxicity. Although the authors of one experimental animal study suggested that methyl disulfide toxicity resembles that of hydrogen sulfide, it is not at all clear that cytochrome oxidase inhibition can result from methyl disulfide exposure. Mechanistically hydrogen sulfide is classified as a chemical asphyxiant because of its known ability to disrupt electron transport and oxidative phosphorylation by interaction with the enzyme cytochrome oxidase. Other sources classify methyl disulfide a simple asphyxiant, which means that it is nonreactive with enzymes or other cell components and simply displaces oxygen in the air. Some information indicates that neurotoxicity to insects results when methyl disulfide disrupts calcium-activated potassium channels in insect pacemaker neurons.
Inkompatibilitäten
Forms explosive mixture with air.Contact with water or acids forms flammable and toxicvapors of hydrogen sulfide. Contact with oxidizing materials or acids can cause a violent reaction.

Dimethyl disulfide Upstream-Materialien And Downstream Produkte

Dimethyldisulfid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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