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Methylamine Basic information
Organic Chemicals Poisoning Uses Production method
Product Name:Methylamine
Product Categories:refrigerants;Alkylamines;Biochemistry;Monofunctional & alpha,omega-Bifunctional Alkanes;Monofunctional Alkanes;Reagents for Oligosaccharide Synthesis
Mol File:74-89-5.mol
Methylamine Structure
Methylamine Chemical Properties
Melting point -93 °C(lit.)
Boiling point -6.3 °C(lit.)
density 0.785 g/mL at 25 °C
vapor density 1.08 (20 °C, vs air)
vapor pressure 27 psi ( 20 °C)
refractive index n20/D 1.371
Fp 61 °F
storage temp. Flammables area
solubility highly soluble in water (108g/100g) at 25°C; soluble in alcohol and miscible with ether; HCl salt is soluble in water and absolute alcohol; compound is insoluble in chloroform, acetone, ether, and ethyl acetate
pka10.63(at 25℃)
Specific Gravity0.901 (20℃/4℃) (40% Soln.)
PH14 (H2O, 20°C)
explosive limit4.9-20.8%
Water Solubility Miscible with water, ethanol, benzene, acetone and ether.
Merck 14,6014
BRN 741851
Stability:Stable. Highly flammable. Note wide explosion limits. Incompatible with oxidizing agents, acids, alkalies, alkaline earth metals, copper and its alloys, zinc and its alloys.
CAS DataBase Reference74-89-5(CAS DataBase Reference)
Safety Information
Hazard Codes F+,Xn,C,F,T
Risk Statements 12-20-37/38-41-34-20/22-11-39/23/24/25-36/37/38-23/24/25-40-19
Safety Statements 7-16-26-36/37-45-29-36/37/39-3/7-3-39-33
RIDADR UN 3286 3/PG 2
WGK Germany 2
RTECS PF6300000
Autoignition Temperature806 °F
HazardClass 3
PackingGroup II
HS Code 29211100
ToxicityLD50 orally in rats: 100-200 mg/kg (Kinney); LC50 in rats: 0.448 ml/l (Sarkar, Sastry)
MSDS Information
SigmaAldrich English
ACROS English
ALFA English
Methylamine Usage And Synthesis
Organic ChemicalsMethylamine, also known as amino methane, is an important kind of organic chemical raw materials and intermediates and is a flammable colorless gas at normal temperature and pressure. Upon being liquefied or compressed at high concentrations, it has a strong odor of ammonia. It has fishy odor at very low concentrations. It is easily soluble in water and soluble in alcohol and ether. It is flammable and can form explosive mixtures with air with the explosive limit being 4.3% to 21%. It has weak alkalinity with the alkaline being stronger than ammonia. It can interact with inorganic acid to form water-soluble salts. It is obtained through the reaction between methanol and ammonia at high pressure and high temperature in the action of catalyst. Alternatively, it can be obtained through the reaction between formaldehyde and ammonium chloride upon being heated to 300 ℃ in the presence of zinc chloride. Methylamine can be used to make pesticides, pharmaceuticals, rubber vulcanization accelerator, dyes, explosives, leather, petroleum, surfactants, and ion exchange resin, paint strippers, and coatings as well as additives. It is an important raw material for the manufacturing of pesticide dimethoate, carbaryl, and chlordimeform. The inhalation toxicity of methylamine belongs to low toxicity category. The maximum allowable air concentration is 5mg/m3 (0.4ppm). It is corrosive and can cause irritation of the eyes, skin and mucous membranes. In case of fire, high heating temperature, it can cause risk of fire with cylinders and accessories damage being capable of causing an explosion.
PoisoningMethylamine belongs to moderate-poisoning drug with a strong irritant and corrosive property. During the process of production and in transit, when there is leakage occurring due to accident, it can cause acute poisoning of contacted people.
This product can be subject to inhalation in its gaseous state from the respiratory tract. Its solution can be absorbed through the skin. Its salt can cause poisoning upon mistakenly oral administration. This product has a strong stimulating effect on eye; upper respiratory tract, skin and mucous membranes. Inhalation of it at high concentrations can cause damage to the lungs with people in severe cases getting pulmonary edema and respiratory distress syndrome, finally leading to death. However, it has been no yet reported of cases of systemic poisoning around the world. Liquid methylamine has strong irritation and corrosion effect and can cause eye and skin chemical burning. In case of 40% aqueous methylamine being splashed into the eyes, the victims can get burning eyes, photophobia, lacrimation, conjunctival hyperemia, eyelid irritation, corneal edema and superficial ulcers with those symptoms being able to last 1 to 2 weeks. Long-term exposure to low concentrations of methylamine can cause dryness and discomfort of the eyes, nose, and throat.
Upon skin contact, the victim should immediately remove the contaminated clothing, wash it thoroughly with a large amount of flowing water. For first-aid, the victim can apply 1 to 2% acetic acid, 0.5% citric acid to wash the skin, mucous membranes and mouth.
When the eyes are contaminated, they should raise the eyelid and wash the eyes with flowing clean water and saline for at least 15 minutes, followed by fluorescein staining. If there is corneal injury occurring, the victims should be invited to an ophthalmologist for treatment.
For patients inhaling nitric methylamine gas and getting poisoned, they should be rapidly transferred from the scene of fresh air and keep the airway open. For patients with breathing difficulties, they should be given oxygen. Patients of respiratory and cardiac arrest should be immediately subject to artificial respiration and sent to hospital immediately after treatment in a timely manner.
This information is edited by Xiongfeng Dai from Chemicalbook.
UsesMethylamine is an important kind of fatty amines organic chemicals and is used in a variety of industries such as manufacture of dyestuffs, treatment of cellulose, acetate rayon, as fuel additive, rocket propellant, and leather tanning processes. It can be used in the synthesis of the N-methyl-chloroacetamide that is the intermediate of the organic phosphorus insecticide dimethoate and omethoate; synthesis of the intermediate of the monocrotophos, α-chloro acetoacetyl methylamine; synthesis of the intermediates of carbamate pesticide, carbamoyl chloride and methyl isocyanate; as well as the synthesis of other pesticides varieties such as formamidine, amitraz, and tribenuron, etc. In addition, it can also be used in medicine, rubber, dyes, leather industry and photosensitive materials.
Production methodThere are a lot of ways for manufacturing of methylamine. But in industry, people mainly apply methanol amination.
CH3OH + NH3 → CH3NH2 + H2O
2CH3OH + NH3 → (CH3) 2NH + 2H2O
3CH3OH + NH3 → (CH3) 3N + 3H2O
It is obtained through the following process: methanol and ammonia is at a ratio of 1.5 to 4 and subject to continuous vapor phase catalytic amination at high temperature and high pressure with activated alumina as a catalyst to generate the mixture crude product of mono-, di-, trimethylamine. The crude mixture further goes through a series of distillation column for continuous pressure and distillation separation, have cooling for deamination, dehydration can yield respectively mono-, di-, trimethylamine products.
Chemical PropertiesMethylamine is a derivative of ammonia in which a methyl group is substituted for a hydrogen (Schweizer et al 1978). Its reactivity is governed primarily by the unshared pair of electrons on the nitrogen, therefore methylamine is a strongly alkaline base whose most characteristic reaction is the formation of salts with acids. It will react with acid halides and acid anhydrides to form N-substituted amines. Methylamine reacts with nitrous acid to form methanol with liberation of nitrogen. It is capable of reacting with aldehydes to form aldimines or Schiffs bases (Astle 1961).
Chemical Propertiescolourless gas (or solution in water or methanol)
Chemical PropertiesMethylamine is a colorless, fi sh-like smelling gas at room temperature. It is used in a variety of industries, such as the manufacture of dyestuffs, treatment of cellulose, acetate rayon, as a fuel additive, rocket propellant, and in leather tanning processes.
Chemical PropertiesMethylamine is a colorless gas with a fish- or ammonia-like odor; at low concentrations a fishy odor. Shipped as a liquefied compressed gas. The odor threshold is 3.2 ppm.
UsesIntermediate for accelerators, dyes, pharmaceuticals, insecticides, fungicides, surface active agents, tanning, dyeing of acetate textiles, fuel additive, polymerization inhibitor, component of paint removers, solvent, photographic developer, rocket propellent.
DefinitionChEBI: The simplest of the methylamines, consisting of ammonia bearing a single methyl substituent.
Production MethodsSeveral methods are currently used for synthesis of methylamine. Virtually all produce a mixture of primary, secondary, and tertiary amines which can be continuously separated by distillation and extraction. The most commonly used synthesis involves heating ammonium chloride and methyl alcohol (ratio varies from 2:1 to 6:1, depending on desired ratio of amines) to about 300°C in the presence of a catalyst such as zinc chloride. Alternatively, methylamine can be synthesized by heating ammonium chloride and formaldehyde in the presence of H2 and a hydrogenation catalyst such as nickel or platinum. Methylamine is generally marketed as a liquid or a 33% aqueous solution (HSDB 1988).
General DescriptionA colorless gas or a liquid. Pungent fishy odor resembling odor of ammonia. The liquid boils at 20.3°F hence vaporizes rapidly when unconfined. Vapors are heavier than air and may collect in low-lying areas. Easily ignited under most conditions. Under prolonged exposure to intense heat the containers may rupture violently and rocket. Used for making pharmaceuticals, insecticides, paint removers, surfactants, rubber chemicals.
Air & Water ReactionsHighly flammable. Very soluble in water; the solutions are strongly basic and therefore corrosive. Liquid fumes in air.
Reactivity ProfileMETHYLAMINE neutralizes acids in exothermic reactions to form salts plus water. May be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides. Flammable gaseous hydrogen is generated in combination with strong reducing agents, such as hydrides.
Hazard(Gas and liquid) Dangerous fire risk. Explosive limits in air 5–21%. Strong irritant to tissue. Eye, skin and upper respiratory tract irritant.
Health HazardVAPOR: Irritating to eyes, nose and throat. If inhaled will cause coughing or difficult breathing. LIQUID: Will burn skin and eyes.
Health HazardExposures to methylamine are known to cause adverse health effects among occupational workers. The workers demonstrate symptoms of toxicity that include, but are not limited to, irritation to the eyes, nose, and throat. Studies have indicated that the compound causes injury to the eyes through corneal opacities and edema hemorrhages in the conjunctiva, and injury to the liver. Studies of Guest and Varma indicated no signifi cant deleterious effects on the internal organs or skeletal deformities in experimental mice
Health HazardExposures to methylamine are known to cause adverse health effects among occupational workers. The workers demonstrate symptoms of toxicity that include, but are not limited to, irritation to the eyes, nose, and throat. Studies have indicated that the compound causes injury to the eyes through corneal opacities and edema hemorrhages in the conjunctiva, and injury to the liver. Studies of Guest and Varma indicated no signifi cant deleterious effects on the internal organs or skeletal deformities in experimental mice.
Health HazardMost of the studies on the toxicity of methylamine suggest it acts locally as an irritant and a sensitizer. Vapors result in eye irritation with tearing and inflammation with repeated exposure capable of inducing corneal damage. Exposure by inhalation irritates the mucous membranes of the nose, throat and lung, leading to coughing and respiratory distress. Skin contact with methylamine can lead to burns and dermatitis (Beard and Noe 1981). First aid for skin exposure requires immediate flushing with water.
Persons exposed to methylamine can detect a faint fishlike odor at less than 10 p.p.m. Little irritation occurs however, above 20 p.p.m. Methylamine can induce temporary irritation of the eyes, nose, and throat. The permissible exposure level (PEL) has been set at 10 p.p.m. (OSHA 1977) and the level immediately dangerous to life or health (IDLH) is 100 p.p.m. (Standards Completion Program, OSHA and NIOSH 1978).
Fire HazardFLAMMABLE. POISONOUS GASES MAY BE PRODUCED IN FIRE. Containers may explode in fire. Flashback along vapor trail may occur. Vapor may explode if ignited in an enclosed area. Toxic nitrogen oxides may be formed. Vapors are heavier than air and may travel considerable distance to a source of ignition and flash back.
Industrial usesMethylamine and its hydrochloride salt are widely used in organic synthesis for introducing the methylamino group. In 1976, industrial consumption was 32,000 tons/year. One of its most important uses is in the preparation of amide-type surfactants. It is also used in the preparation of drugs such as adrenaline and synthetic caffeine. It serves as the base for more than twenty commercial products, among those included are photographic developers, insecticides, and antihistamine drugs (Beard and Noe 1981). It is also widely used in tanning and has been used in the separation of aromatics from aliphatic hydrocarbons (Sittig 1981).
Safety ProfilePoison by subcutaneous route. Moderately toxic by inhalation. A severe skin irritant. Mutation data reported. A strong base. Flammable gas at ordinary temperature and pressure. Very dangerous fire hazard when exposed to heat, flame, or sparks. Explosive when exposed to heat or flame. To fight fire, stop flow of gas. Forms an explosive mixture with nitromethane. When heated to decomposition it emits toxic fumes of NOx. See also AMINES.
Potential ExposureMethylamine is used in organic synthesis; a starting material for N-oleyltaurine, a surfactant; and p-N-methylaminophenol sulfate, a photographic developer. It has possible uses in solvent extraction systems in separation of aromatics from aliphatic hydrocarbons. It is also used in the synthesis of many different pharmaceuticals; pesticides and rubber chemicals.
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.
MetabolismMethylamine is a normal body constituent in several species and is known to be generated endogenously from epinephrine (Schayer et al 1952) and creatine (Davis and DeRopp 1961). It has also recently been detected in the urine of male CBA/cA mice treated with N-methylformamide (Kestell et al 1985). Mammalian metabolism of methylamine is rapid yet the enzymes involved are not yet known. Simehnhoff (1975) suggested that methylamine is methylated to dimethylamine as it appeared not to be oxidized by amine oxidases yet was rapidly absorbed and not excreted in the urine. Dar et al (1985) conducted studies using methyl-[14C]- labeled methylamine injected i.p. into rats to assess the role of monoamine oxidase in the metabolism of methylamine in the rats. Methylamine underwent rapid oxidation as more than 30% of the 14C was recovered as 14CO2 in the first 2-6 h following exposure and 52% was expired in the first 24 h. Pretreatment of the rats with long acting monoamine oxidase inhibitors significantly inhibited methylamine metabolism, however short term inhibitors were without effect. Combinations of the drugs suggested that monoamine oxidase was not responsible for metabolism of methylamine and that a closely related enzyme such as methylamine oxidase, previously proposed by Werner and Seiber (1963), may be involved.
It has also been reported that intestinal microflora may degrade methylamine (Iyer and Kailio 1958). Dar et al (1985) found that pretreatment of rats with neomycin to reduce bacterial microorganisms resulted in only a slight inhibition of 14C expiration during the initial 6 h following methylamine administration. These results indicate that, at least in the rat, bacterial oxidation of methylamine in the intestine is negligible.
ShippingUN1061 Methylamine, anhydrous, Hazard Class: 2.1; Labels: 2.1-Flammable gas. UN1235 Methylamine, aqueous solution, Hazard Class: 3; Labels: 3-Flammable liquid, 8-Corrosive material. 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.
Purification MethodsDry the amine with sodium or BaO. It is commercially available in metal cylinders. [Beilstein 4 IV 118.]
IncompatibilitiesA medium-strong base. Reacts violently with strong acids; mercury, strong oxidizers; nitromethane. Corrosive to copper, zinc alloys; aluminum, and galvanized surfaces.
Waste DisposalReturn refillable compressed gas cylinders to supplier. Controlled incineration (incinerator equipped with a scrubber or thermal unit to reduce nitrogen oxides emissions).
Tag:Methylamine(74-89-5) Related Product Information
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