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METHYL MERCAPTAN

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Company Name: Mainchem Co., Ltd.
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Products Intro: Product Name:METHYL MERCAPTAN
CAS:74-93-1
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Products Intro: CAS:74-93-1
Purity:0.99 Package:5KG;1KG;25KG PRICE quotation Remarks:Factory stock, quality assurance, price concessions
Company Name: Hubei Jusheng Technology Co.,Ltd.
Tel: 86-188-71490254
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Products Intro: Product Name:methanethiol
CAS:74-93-1
Purity:99% Package:5KG;1KG
Company Name: career henan chemical co
Tel: +86-371-86658258
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Products Intro: Product Name:METHYL MERCAPTAN
CAS:74-93-1
Purity:98% Package:25KG;100USD
Company Name: J & K SCIENTIFIC LTD.  
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Products Intro: Product Name:Methyl Mercaptan
CAS:74-93-1
Purity:2000 μg/ML in Toluene Package:1ML

Lastest Price from METHYL MERCAPTAN manufacturers

  • METHYL MERCAPTAN
  • US $100.00 / KG
  • 2019-05-13
  • CAS:74-93-1
  • Min. Order: 25KG
  • Purity: 98%
  • Supply Ability: 1000KG
METHYL MERCAPTAN Basic information
Product Name:METHYL MERCAPTAN
Synonyms:THIOMETHANOL;THIOMETHYL ALCOHOL;FEMA 2716;METHANETHIOL;MERCAPTAN C1;MERCAPTOMETHANE;METHYL MERCAPTAN;METHYL SULFHYDRATE
CAS:74-93-1
MF:CH4S
MW:48.11
EINECS:200-822-1
Product Categories:API intermediates
Mol File:74-93-1.mol
METHYL MERCAPTAN Structure
METHYL MERCAPTAN Chemical Properties
Melting point −123 °C(lit.)
Boiling point 6 °C(lit.)
density 0.8665
vapor density 1.66 (vs air)
vapor pressure 1536 mm Hg ( 20 °C)
refractive index 1.4020 (estimate)
FEMA 2716 | METHYL MERCAPTAN
Fp <71℃
form liquid
pka10.3(at 25℃)
explosive limit21.8%
JECFA Number508
Merck 13,5983
BRN 1696840
Exposure limitsTLV-TWA 0.5 ppm (~1.0 mg/m3 ) (ACGIH and MSHA); ceiling 10 ppm (OSHA); IDLH 400 ppm (NIOSH); the revised IDLH is 150 ppm in analogy to H2S.
Stability:Stable. Highly flammable - note low flash point. Reacts vigorously or explosively with a wide variety of materials - consult a full MSDS data sheet before using. Incompatible with strong oxidizing agents, alkali and alkaline earth metals, epoxides, hydrazines, ketones, lead, mercury (II) oxide, azo- and diazo- compounds, copp
CAS DataBase Reference74-93-1(CAS DataBase Reference)
Safety Information
Hazard Codes F+,T,N
Risk Statements 12-23-50/53
Safety Statements 16-25-60-61
RIDADR UN 2037 2.3
WGK Germany 3
RTECS PB4375000
13-27
HazardClass 2.3
MSDS Information
ProviderLanguage
SigmaAldrich English
METHYL MERCAPTAN Usage And Synthesis
DescriptionMethanethiol (also known as methyl mercaptan) is a colorless gas with a smell like rotten cabbage. It is a natural substance found in the blood and brain of humans and other animals as well as plant tissues. It is disposed of through animal feces. It occurs naturally in certain foods, such as some nuts and cheese. It is also one of the main chemicals responsible for bad breath and the smell of flatus. The chemical formula for methanethiol is CH3SH; it is classified as a thiol. It is sometimes abbreviated as MeSH. It is very flammable.
Chemical Propertiescolourless gas with a garlic-like or rotten cabbage-like smell
Chemical PropertiesMethyl mercaptan is a colorless gas or white liquid with a disagreeable odor like garlic or rotten cabbage. Shipped as a liquefied compressed gas. The odor threshold is 0.002 ppm.
OccurrenceMethanethiol is released from decaying organic matter in marshes and is present in the natural gas of certain regions, in coal tar, and in some crude oils.
In surface seawater, methanethiol is the primary breakdown product of the algal metabolite dimethylsulfoniopropionate (DMSP). Marine bacteria appear to obtain most of their protein sulfur by the breakdown of DMSP and incorporation of methanethiol, despite the fact that methanethiol is present in seawater at much lower concentrations than sulfate (~0.3 nM vs. 28 mM). Bacteria in oxic and anoxic environments can also convert methanethiol to dimethyl sulfide (DMS), although most DMS in surface seawater is produced by a separate pathway. Both DMS and methanethiol can be used by certain microbes as substrates for methanogenesis in some anaerobic soils.
Methanethiol is a weak acid, with a pKa of ~10.4. This acidic property makes it reactive with dissolved metals in aqueous solutions. The environmental chemistry of these interactions in seawater or fresh water environments such as lakes has yet to be fully investigated.
A material safety data sheet (MSDS) lists methanethiol as a colorless, flammable gas with an extremely strong and repulsive smell. At very high concentrations it is highly toxic and affects the central nervous system. Its penetrating odor provides warning at dangerous concentrations. An odor threshold of 1 ppb has been reported. The United States OSHA Ceiling Limit is listed as 10 ppm.
UsesMethanethiol is mainly used to produce methionine, which is used as a dietary component in poultry and animal feed. Methanethiol is also used in the plastics industry and as a precursor in the manufacture of pesticides. It is released as a by-product of wood pulping in pulp mills.
Methanethiol is also used for communication in mining operations . Releasing the substance into the ventilation system is generally the most efficient and reliable means to alert all workers of an emergency , and is referred to as "releasing the pest" ,This substance's strong odor alerts the miners to immediately go to a saferoom.
Since natural gas and propane are colorless and odorless, a small amount of methyl mercaptan or ethyl mercaptan is added to make it easy to detect a gas leak.
UsesMethanethiol is used in the manufacture ofpesticides and fungicides and as an intermediate in the manufacture of jet fuels (Watkinset al. 1989); it is added to natural gas to giveodor. It is used in the synthesis of methionine.
UsesSynthesis, especially of methionine, jet fuel additives, fungicides; also as catalyst.
PreparationMethanethiol is prepared commercially by the reaction of methanol with hydrogen sulfide gas over an acidic solid catalyst, such as alumina. It can be prepared by the reaction of methyl iodide with thiourea.
Air & Water ReactionsHighly flammable. Reacts with water, steam or acids to produce toxic, flammable vapors [Lewis].
Reactivity ProfileMETHYL MERCAPTAN is a reducing agent--can react vigorously with oxidizing agents. Dangerous fire or explosion hazard when exposed to heat, flame, sparks or strong oxidizing agents (e.g., calcium hypochlorite). When heating to decomposition emits highly toxic fumes of oxides of sulfur [Lewis, 3rd ed., 1993, p. 862]. Violent reaction with mercury(II) oxide [Klason P., Ber., 1887, 20, p. 3410].
HazardFlammable, dangerous fire risk. Explosive limits in air 3.9–21.8%. Strong irritant. Liver damage.
Health HazardCan cause death by respiratory paralysis. It is an eye and respiratory tract irritant. Exposure results in pulmonary edema and hepatic and renal damage.
Health HazardThe acute toxicity of methanethiol is simi-lar to that of hydrogen sulfide. Inhalation ofthis gas can cause narcosis, headache, nau-sea, pulmonary irritation, and convulsions inhumans. Other symptoms noted are acutehemolytic anemia, methemoglobinemia, andcyanosis. In humans, several hours exposure to about 5 ppm concentration of thisgas can cause headache and nausea. Exposure to high concentrations can result inrespiratory paralysis and death. The 2-hour inhalation LC50 value in mice is within therange 650 mg/m3.
Shults et al. (1970) reported a case of ahuman death from overexposure to methane-thiol. The victim developed acute hemolyticanemia and methemoglobinemia and re-mainedindeepcomauntil deaththatoccurred28 days after the accident from emptying gascylinders.
Fire HazardCombustion produces irritating sulfur dioxide. Flash back along vapor track may occur. Very dangerous when exposed to heat, flame, or oxidizers. On decomposition METHYL MERCAPTAN emits highly toxic fumes of sulfur oxides. METHYL MERCAPTAN will react with water, steam or acids to produce toxic and flammable vapors; and can react vigorously with oxidizing materials. Irritating sulfur dioxide is produced upon combustion. When heated to decomposition, METHYL MERCAPTAN emits highly toxic fumes and flammable vapors. Incompatible with mercuric oxide and oxidizing materials. Avoid direct sunlight, and areas of high fire hazards. Hazardous polymerization may not occur.
Safety ProfilePoison by inhalation. Mutation data reported. A common air contaminant. Very dangerous fire hazard when exposed to heat or flame; can react vigorously with oxidzing materials. Explosive in the form of vapor when exposed to heat or flame. Reacts with water, steam, or acids to produce toxic and flammable vapors. Violent reaction with mercury(II) oxide. To fight fire, use alcohol foam, CO2, dry chemical. Upon decomposition it emits highly toxic fumes of SOx.
Potential ExposureMethyl mercaptan is used in methionine synthesis, and widely as an intermediate in pesticide manufacture. A foul-smelling odorant usually added to chemicals, including pesticides.
First aidIf this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. Medical observation is recommended for 24 to 48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy. If frostbite has occurred, seek medical attention immediately; do NOT rub the affected areas or flush them with water. In order to prevent further tissue damage, do NOT attempt to remove frozen clothing from frostbitten areas. If frostbite has NOT occurred, immediately and thoroughly wash contaminated skin with soap and water.
ShippingUN1064 Methyl mercaptan, Hazard Class: 2.3; Labels: 2.3-Poisonous gas, 2.1-Flammable gas, Inhalation Hazard Zone C. Cylinders must be transported in a secure upright position, in a well-ventilated truck. Protect cylinder and labels from physical damage. The owner of the compressed gas cylinder is the only entity allowed by federal law (49CFR) to transport and refill them. It is a violation of transportation regulations to refill compressed gas cylinders without the express written permission of the owner.
AsparagusMethanethiol is a byproduct produced by the metabolism of asparagus. The ability to produce methanethiol in urine after eating asparagus was once thought to be a genetic trait. However recent research suggests that the peculiar odor is in fact produced by all humans after consuming asparagus, while the ability to detect it (methanethiol being one of many components in "asparagus pee") is in fact the genetic trait. The chemical components responsible for the change in the odor of urine show as soon as 15 minutes after eating asparagus.
IncompatibilitiesViolent reaction with strong oxidizers, bleaches, copper, nickel and their alloys; aluminum. Reacts with acids producing flammable and toxic hydrogen sulfide
Waste DisposalReturn refillable compressed gas cylinders to supplier. 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 followed by effective scrubbing of the effluent gas.
Tag:METHYL MERCAPTAN(74-93-1) Related Product Information
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