2-Butanethiol

90.19

90.19

208-165-2

78417

2347

DTXSID1041396

Colorles liquid|Mobile liquid

29309070

1

2.18 (est)

Liquid

0.8299 g/cm³ @ Temp: 17 °C

-165 °C

84-85 °C

70 °F

1.435

In water, 1.32X10+3 mg/L at 20 deg C

Store below +30°C.

142 mm Hg ( 37.7 °C)

3.11 (Air = 1)

LD50 orally in Rabbit: 5176 mg/kg LD50 dermal Rabbit > 2000 mg/kg

1.7-9.6%(V)

Obnoxious odor

4.00e-11 cm3/molecule*sec

Henry's Law constant = 7.26X10-3 atm-cu m/mol at 25 °C (est)

BP: 85 °C at 760 mm Hg; index of refraction: 1.4366 at 20 °C/D; sol in ethanol, ether, benzene; slightly soluble in carbon tetrachloride. Density: 0.8295 at 20 °C/4 °C /DL form/|Max absorption (isooctane): 225-230 nm (log epsilon= 2.13); specific optical rotation: +15.7 at 20 deg/D; bp: 85-95 °C; density: 0.8299 at 20 °C/4 °C; index of refraction: 1.43385 a 25 °C/D; sol in benzene, petroleum ether, alc, ether /D form/|Specific optical rotation: -17.35 deg at 17 °C/D; bp: 83-84 °C; density: 0.8300 at 17 °C/4 °C; sol in benzene, petroleum ether, alc, ether /L form/|Freezing point = -140.14 °C|Hydroxyl radical reaction rate constant = 4.00X10-11 cu cm/molec-sec at 25 °C

II

3.1

UN 2347 3/PG 2

3

11-36/37/38

16-26-36

F,Xi

P210-P261-P305 + P351 + P338

H225-H315-H319-H335

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.

Flammable - 3rd degree

Personnel protection: ... Wear appropriate chemical protective gloves, boots and goggles. ... Wear positive pressure self-contained breathing apparatus when fighting fires involving this material. /Butyl mercaptan/

In general, mercaptans are flammable substances.

... Lower members of the group, such as ... butyl mercaptan ... form explosive mixtures with air.

If material on fire or involved in fire: Do not extinguish fire unless flow can be stopped or safely confined. Use water in flooding quantities as fog. Solid streams of water may spread fire. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use "alcohol" foam, dry chemical or carbon dioxide. /Butyl mercaptan/

SRP: Local exhaust ventilation should be applied wherever there is an incidence of point source emissions or dispersion of regulated contaminants in the work area. Ventilation control of the contaminant as close to its point of generation is both the most economical and safest method to minimize personnel exposure to airborne contaminants.|Generally process from which mercaptan vapor is liable to be evolved should as far as practicable be enclosed, and exhaust ventilation should be provided to prevent vapors from diffusing into atmosphere of workroom. /mercaptans/|If material not on fire and not involved in fire: Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard. Use water spray to disperse vapors and dilute standing pools of liquid. /Butyl mercaptan/|Personnel protection: Avoid breathing vapors. Keep upwind. ... Do not handle broken packages unless wearing appropriate personal protective equipment. Wash away any material which may have contacted the body with copious amounts of water or soap and water. ... /Butyl mercaptan/|For more Preventive Measures (Complete) data for SEC-BUTYL MERCAPTAN (6 total), please visit the HSDB record page.

/GUIDE 130: FLAMMABLE LIQUIDS (NON-POLAR/WATER-IMMISCIBLE/NOXIOUS)/ Fire or Explosion: 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. Those substances designated with a "P" may polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water. /Butyl mercaptan/|/GUIDE 130: FLAMMABLE LIQUIDS (NON-POLAR/WATER-IMMISCIBLE/NOXIOUS)/ Health: 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. /Butyl mercaptan/|/GUIDE 130: FLAMMABLE LIQUIDS (NON-POLAR/WATER-IMMISCIBLE/NOXIOUS)/ Public Safety: CALL Emergency Response Telephone Number ... . As an immediate precautionary measure, isolate spill or leak area for at least 50 meters (150 feet) in all directions. Keep unauthorized personnel away. Stay upwind. Keep out of low areas. Ventilate closed spaces before entering. /Butyl mercaptan/|/GUIDE 130: FLAMMABLE LIQUIDS (NON-POLAR/WATER-IMMISCIBLE/NOXIOUS)/ Protective Clothing: Wear positive pressure self-contained breathing apparatus (SCBA). Structural firefighters' protective clothing will only provide limited protection. /Butyl mercaptan/|For more DOT Emergency Guidelines (Complete) data for SEC-BUTYL MERCAPTAN (8 total), please visit the HSDB record page.

No person may /transport,/ offer or accept a hazardous material for transportation in commerce unless that person is registered in conformance ... and the hazardous material is properly classed, described, packaged, marked, labeled, and in condition for shipment as required or authorized by ... /the hazardous materials regulations (49 CFR 171-177)./|The International Air Transport Association (IATA) Dangerous Goods Regulations are published by the IATA Dangerous Goods Board pursuant to IATA Resolutions 618 and 619 and constitute a manual of industry carrier regulations to be followed by all IATA Member airlines when transporting hazardous materials.|The International Maritime Dangerous Goods Code lays down basic principles for transporting hazardous chemicals. Detailed recommendations for individual substances and a number of recommendations for good practice are included in the classes dealing with such substances. A general index of technical names has also been compiled. This index should always be consulted when attempting to locate the appropriate procedures to be used when shipping any substance or article.

| 2 - Materials that, under emergency conditions, can cause temporary incapacitation or residual injury.| 3 - Liquids and solids that can be ignited under almost all ambient temperature conditions. Materials produce hazardous atmospheres with air under almost all ambient temperatures or, though unaffected by ambient temperatures, are readily ignited under almost all conditions.| 0 - Materials that in themselves are normally stable, even under fire conditions.

LD50 Rat oral 5176 mg/kg

Mercaptans are formed naturally in biological processes and exist in all living systems(1,2); the lower alkyl mercaptans occur in manure gas from domestic animal pens(1) and have obnoxious odors at low concns(1-3).

sec-Butyl mercaptan's production and use as a natural gas odorant(1) may result in its release to the environment through various waste streams(SRC).

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 84(SRC), determined from a water solubility of 1.32X10+3 mg/L(2) and a regression-derived equation(3), indicates that sec-butyl mercaptan is expected to have high mobility in soil(SRC). Volatilization of sec-butyl mercaptan from moist soil surfaces is expected to be an important fate process(SRC) given an estimated Henry's Law constant of 7.3X10-3 atm-cu m/mole(SRC), derived from its extrapolated vapor pressure, 81 mm Hg(4), and water solubility(2). sec-Butyl mercaptan is expected to volatilize from dry soil surfaces(SRC) based upon its extrapolated vapor pressure(4). Biodegradation data were not available(SRC, 2005).|AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 84(SRC), determined from a water solubility of 1.32X10+3 mg/L(2) and a regression-derived equation(3), indicates that sec-butyl mercaptan is not expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is expected(3) based upon an estimated Henry's Law constant of 7.3X10-3 atm-cu m/mole(SRC), derived from its extrapolated vapor pressure, 81 mm Hg(4), and water solubility(2). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 3 hours and 4 days, respectively(SRC). According to a classification scheme(6), an estimated BCF of 11(SRC), from its water solubility(2) and a regression-derived equation(3), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Biodegradation data were not available(SRC, 2005).|ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), sec-butyl mercaptan, which has an extrapolated vapor pressure of 81 mm Hg at 25 °C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase sec-butyl mercaptan is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 7 hours(SRC), calculated from its rate constant of 4.0X10-11 cu cm/molecule-sec at 25 °C(3). sec-Butyl mercaptan does not absorb light at wavelengths >290 nm and therefore is not expected to be susceptible to direct photolysis by sunlight.

The rate constant for the reaction of sec-butyl mercaptan with hydroxyl radicals has been experimentally determined to be 3.8X10-11 to 4.0X10-11 cu cm/molecule-sec at 25 °C(1-3). This corresponds to an atmospheric half-life range of about 7 to 11 hours at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm(1-3). sec-Butyl mercaptan is not expected to undergo hydrolysis in the environment due to the lack of hydrolyzable functional groups(4). sec-Butyl mercaptan does not absorb light at wavelengths >290 nm and therefore is not expected to be susceptible to direct photolysis by sunlight.

An estimated BCF of 11 was calculated for sec-butyl mercaptan(SRC), using a water solubility of 1.32X10+3 mg/L(1) and a regression-derived equation(2). According to a classification scheme(3), this BCF suggests the potential for bioconcentration in aquatic organisms is low(SRC).

The Koc of sec-butyl mercaptan is estimated as 84(SRC), using a water solubility of 1.32X10+3 mg/L(1) and a regression-derived equation(2). According to a classification scheme(3), this estimated Koc value suggests that sec-butyl mercaptan is expected to have high mobility in soil.

The Henry's Law constant for sec-butyl mercaptan is estimated as 7.3X10-3 atm-cu m/mole(SRC) derived from its vapor pressure, 80.7 mm Hg(1), and water solubility, 1.32X10+3 mg/L(2). This Henry's Law constant indicates that sec-butyl mercaptan is expected to volatilize rapidly from water surfaces(3). Based on this Henry's Law constant, the volatilization half-life from a model river (1 m deep, flowing 1 m/sec, wind velocity of 3 m/sec)(3) is estimated as 3 hours(SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec)(3) is estimated as 4 days(SRC). sec-Butyl mercaptan is expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(1).

NIOSH (NOES Survey 1981-1983) has statistically estimated that 4,715 workers are potentially exposed to sec-butyl mercaptan in the US(1). Occupational exposure to sec-butyl mercaptan may occur through inhalation and dermal contact with this compound at workplaces where sec-butyl mercaptan is produced or used(SRC). Use data suggest that the general population may be exposed to sec-butyl mercaptan via inhalation of ambient air in the vicinity of natural gas refineries and operations due to use as a natural gas odorant(SRC).

Simple aliphatic and aromatic thiols undergo S-methylation in mammals to produce the corresponding methyl thioether or sulfide. Methylation is catalysed by thiopurine methyltransferase in the cytoplasm and thiol methyltransferase in microsomes, and both reactions require S-adenosyl-l-methionine as a methyl group donor. Thiopurine methyltransferase is present in human liver, kidney, and erythrocytes; preferential substrates for this enzyme include aromatic and heterocyclic thiols. S-Methylation of aliphatic thiols is catalysed by microsomal thiol methyltransferase, and the resulting methyl thioether (sulfide) metabolite would undergo S-oxidation to give the methyl sulfoxide and methyl sulfone analogues as urinary products. Thiols may react with glutathione and other endogenous thiol substances to form mixed disulfides. Both microsomal and cytoplasmic thioltransferasess have been reported to catalyse the formation of mixed disulfides. The resulting mixed disulfides can undergo reduction back to thiols, oxidative desulfuration, or oxidation to a sulfonic acid via the intermediate thiosulfinate and sulfinic acids. The principal form in the circulation would probably be a mixed disulfide formed with albumin. /Simple thiols/

/SRP:/ Basic treatment: Establish a patent airway. Suction if necessary. Watch for signs of respiratory insufficiency and assist ventilations if necessary. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Monitor for pulmonary edema and treat if necessary ... . Anticipate seizures and treat if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with normal saline during transport ... . Do not use emetics. For ingestion, rinse mouth and administer 5 m1/kg up to 200 ml of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool ... . Administer activated charcoal ... . Cover skin burns with dry sterile dressings after decontamination ... . /Sulfur and related compounds/|/SRP:/ Advanced treatment: Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious. Early intubation at the first sign of upper airway obstruction may be necessary. Monitor cardiac rhythm and treat arrhythmias if necessary ... . Start an IV with D5W /SRP: "To keep open", minimal flow rate/. Use lactated Ringer's if signs of hypovolemia are present. Watch for signs of fluid overload. Consider drug therapy for pulmonary edema ... . Treat seizures with diazepam ... . For hypotension with signs of hypovolemia, administer fluid cautiously. Consider vasopressors for hypotension with a normal fluid volume. Watch for signs of fluid overload ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Sulfur and related compounds/

/SIGNS AND SYMPTOMS/ Strong, offensive smell of mercaptans can cause headache and nausea. High concentration of their vapors in atmosphere can produce unconsciousness with cyanosis, a sense of coldness at the extremities and quickening of pulse. ... Pulmonary edema /is also observed/. /Mercaptans/

Grade: 95%.

All other basic organic chemical manufacturing|2-Butanethiol: ACTIVE|Thiols can be prepared by a variety of methods. The most-utilized of these synthetic methods for tertiary and secondary thiols is acid-catalyzed synthesis; for normal and secondary thiols, the most-utilized methods are free-radical-initiated, alcohol substitution, or halide substitution; for mercaptoalcohols, the most-utilized method is oxirane addition; and for mercaptoacids and mercaptonitriles, the most-utilized methods are Michael-type additions. /Thiols/

Food additives -> Flavoring Agents|Fire Hazards -> Flammable - 3rd degree

Flavoring Agents