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Methyl acetate

Product Name
Methyl acetate
CAS No.
79-20-9
Chemical Name
Methyl acetate
Synonyms
ACETIC ACID METHYL ESTER;CH3COOCH3;methylethanoate;Acetate de methyle;Metile;Devoton;Tereton;Methylacetat;Methyl ethanoate;methyle(acetatede)
CBNumber
CB9167443
Molecular Formula
C3H6O2
Formula Weight
74.08
MOL File
79-20-9.mol
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Methyl acetate Property

Melting point:
-98 °C (lit.)
Boiling point:
57-58 °C (lit.)
Density 
0.934 g/mL at 25 °C
vapor density 
2.55 (vs air)
vapor pressure 
165 mm Hg ( 20 °C)
refractive index 
n20/D 1.361(lit.)
FEMA 
2676 | METHYL ACETATE
Flash point:
3.2 °F
storage temp. 
no restrictions.
solubility 
250g/l
form 
Solution
color 
Clear colorless to slightly pale yellow
Relative polarity
0.253
Odor
Slightly acrid, sweet; fragrant.
Odor Threshold
1.7ppm
Odor Type
ethereal
explosive limit
3.1-16%(V)
Water Solubility 
250 g/L (20 ºC)
λmax
λ: 255 nm Amax: 1.0
λ: 275 nm Amax: 0.1
λ: 300 nm Amax: 0.01
Merck 
14,6008
JECFA Number
125
BRN 
1736662
Henry's Law Constant
0.90 at 20.00 °C, 1.56 at 30.00 °C (headspace-GC, Hovorka et al., 2002)
Exposure limits
TLV-TWA 200 ppm (～610 mg/m3) (ACGIH, MSHA, and OSHA); TLV-STEL 250 ppm (～760 mg/m3) (ACGIH); IDLH 10,000 ppm (NIOSH).
Dielectric constant
7.3（20℃）
Stability:
Stable. Extremely flammable - readily forms explosive mixtures with air. Note low flash point and wide explosion limits. Incompatible with strong oxidizing agents, strong bases, strong acids, nitrates. May be moisture sensitive.
LogP
0.18 at 20℃
CAS DataBase Reference
79-20-9(CAS DataBase Reference)
NIST Chemistry Reference
Acetic acid, methyl ester(79-20-9)
EPA Substance Registry System
Methyl acetate (79-20-9)
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Safety

Hazard Codes 
F,Xi
Risk Statements 
11-36-66-67
Safety Statements 
16-26-29-33
RIDADR 
UN 1231 3/PG 2
WGK Germany 
1
RTECS 
AI9100000
Autoignition Temperature
936 °F
TSCA 
Yes
HS Code 
2915 39 00
HazardClass 
3
PackingGroup 
II
Hazardous Substances Data
79-20-9(Hazardous Substances Data)
Toxicity
LD50 orally in Rabbit: > 5000 mg/kg LD50 dermal Rat > 2000 mg/kg
IDLA
3,100 ppm [10% LEL]
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H225Highly Flammable liquid and vapour

H319Causes serious eye irritation

H336May cause drowsiness or dizziness

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P233Keep container tightly closed.

P240Ground/bond container and receiving equipment.

P241Use explosion-proof electrical/ventilating/lighting/…/equipment.

P242Use only non-sparking tools.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
W267619
Product name
Methyl acetate
Purity
natural, 98%, FG
Packaging
1kg
Price
$228
Updated
2024/03/01
Sigma-Aldrich
Product number
8.09711
Product name
Methyl acetate
Purity
for synthesis
Packaging
1L
Price
$59.1
Updated
2024/03/01
Sigma-Aldrich
Product number
PHR2926
Product name
Methyl Acetate
Packaging
3X1.2ML
Price
$190
Updated
2024/03/01
Sigma-Aldrich
Product number
8.09711
Product name
Methyl acetate
Purity
for synthesis
Packaging
2.5L
Price
$144
Updated
2024/03/01
Sigma-Aldrich
Product number
45999
Product name
Methyl acetate
Purity
suitable for HPLC, ≥99.8%
Packaging
250ML
Price
$217
Updated
2024/03/01
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Methyl acetate Chemical Properties,Usage,Production

Description

Methyl acetate, also known as MeOAc , acetic acid methyl ester or methyl ethanoate, is a carboxylate ester with the formula CH3COOCH3. It is a flammable liquid with a characteristically pleasant smell reminiscent of some glues and nail polish removers. Methyl acetate is occasionally used as a solvent, being weakly polar and lipophilic, but its close relative ethyl acetate is a more common solvent being less toxic and less soluble in water. Methyl acetate has a solubility of 25% in water at room temperature. At elevated temperature its solubility in water is much higher. Methyl acetate is not stable in the presence of strong aqueous bases or aqueous acids. Methyl acetate is VOC exempt.

Chemical Properties

Methyl acetate has a pleasant, fruity odor and slightly bitter flavor. May be prepared by boiling acetic acid and methanol in the presence of acid catalysts; or by heating methanol with an excess carbon monoxide under pressure in the presence of a catalyst (phosphoric acid, cobalt salts).
Methyl acetate occurs naturally in low concentrations in mint, fungus,grapes, banana, coffee (Furia and Bellanca, 1975) and is a volatile constituent of nectarines (Takeoka et al., 1988). It is also present in some distilled alcoholic beverages (Shimoda et al., 1993). It is produced industrially via the carbonylation of methanol as a byproduct of acetic acid production or by esterification of acetic acid with methanol in the presence of strong acid such as sulfuric acid.

Physical properties

Colorless liquid with a pleasant odor. An odor threshold concentration of 48 ppbv was reported by Nagata and Takeuchi (1990). Cometto-Mu?iz and Cain (1991) reported an average nasal pungency threshold concentration of 112,500 ppmv.

Occurrence

Reported found in apple, banana, sweet and sour cherry, tangerine juice, black currants, guava, grapes, melon, peach, pear, pineapple, strawberry, cabbage, tomato, clove bud, peppermint oil, vinegar, bread, cheeses, butter, yogurt, beef, beer, cognac, rum, whiskies, cider, sherry, grape wines, cocoa, coffee, filbert, peanut, honey, soybean, olive, passion fruit, fruit brandies, fig, gin, kiwifruit, clary sage, arrack and nectarine.

Uses

Methyl acetate is used as a solvent forlacquers, resins, oils, and nitrocellulose; inpaint removers; as a flavoring agent; and inthe manufacture of artificial leather.

Preparation

Methyl acetate is produced industrially via the carbonylation of methanol as a byproduct of the production of acetic acid.Methyl acetate also arises by esterification of acetic acid with methanol in the presence of strong acids such as sulfuric acid, this production process is famous because of Eastman Kodak's intensified process using a reactive distillation.
2–1-Reactions
In the presence of strong bases such as sodium hydroxide or strong acids such as hydrochloric acid or sulfuric acid it is hydrolyzed back into methanol and acetic acid, especially at elevated temperature. The conversion of methyl acetate back into its components, by an acid , is a first-order reaction with respect to the ester. The reaction of methyl acetate and a base, for example sodium hydroxide, is a second-order reaction with respect to both reactants.
3-Applications
A major use of methyl acetate is as a volatile low toxicity solvent in glues, paints, and nail polish removers. Acetic anhydride is produced by carbonylation of methyl acetate in a process that was inspired by the Monsanto acetic acid synthesis.

Definition

ChEBI: Methyl acetate is an acetate ester resulting from the formal condensation of acetic acid with methanol. A low-boiling (57°C) colourless, flammable liquid, it is used as a solvent for many resins and oils. It has a role as a polar aprotic solvent, a fragrance and an EC 3.4.19.3 (pyroglutamyl-peptidase I) inhibitor. It is an acetate ester, a methyl ester and a volatile organic compound.

Application

Methyl acetate may be used for the preparation of fatty acid methyl esters and triacetin from rapeseed oil via non-catalytic trans-esterification reaction under super-critical conditions.
Methyl acetate may be used in the following:
As acyl acceptor in the preparation of biodiesel.
Synthesis of ethanol.
Preparation of n-butyl acetate, via transesterification reaction with n-butanol in the presence of acidic catalysts.
It may also be used as a precursor in the synthesis of the following:
acetic anhydride
methyl acrylate
vinyl acetate
ethyl amide

Aroma threshold values

Detection: 1.5 to 47 ppm

Taste threshold values

Taste characteristics at 60 ppm: green, ethereal, fruity, fresh, rum and whiskey-like.

General Description

Methyl acetate appears as a clear colorless liquid with a fragrant odor. Moderately toxic. Flash point 14 °F. Vapors heavier than air.

Air & Water Reactions

Highly flammable. Water soluble.

Reactivity Profile

Methyl acetate presents a fire or explosion hazard when exposed to strong oxidizing agents. Emits irritating fumes and acrid smoke when heated to decomposition, [Lewis, 3rd ed., 1993, p. 826]. Methyl acetate reactivity is consistent with other compounds of the ester group.

Hazard

Flammable, dangerous fire and explosion risk, explosive limits in air 3–16%. Irritant to respiratory tract. Headache, dizziness, nausea, eye damage (degeneration of ganglion cells in the retina).

Health Hazard

(Very similar to those of methyl alcohol, which constitutes 20% of commercial grade.) Inhalation causes headache, fatigue, and drowsiness; high concentrations can produce central nervous system depression and optic nerve damage. Liquid irritates eyes and may cause defatting and cracking of skin. Ingestion causes headache, dizziness, drowsiness, fatigue; may cause severe eye damage.

Health Hazard

The toxic effects from exposure to methylacetate include inflammation of the eyesvisual and nervous disturbances, tightnessof the chest, drowsiness, and narcosis. Ithydrolyzes in body to methanol, which prob ably produces the atrophy of the optic nerve.A 4-hour exposure to 32,000 ppm was lethalto rats. Oral and dermal toxicities of thiscompound are low. An oral LD50 value inrats is on the order of 5000 mg/kg.

Fire Hazard

Behavior in Fire: Vapor is heavier than air and may travel a considerable distance to a source of ignition and flash back.

Safety Profile

Moderately toxic by several routes. A human systemic irritant by inhalation. A moderate skin and eye irritant. Mutation data reported. Dangerous fire hazard when exposed to heat, flame, or oxidizers. Moderate explosion hazard when exposed to heat or flame. When heated to decomposition it emits acrid smoke and fumes. See also ESTERS.

Synthesis

By boiling acetic acid and methanol in the presence of acid catalysts, or by heating methanol with an excess of carbon monoxide under pressure in the presence of a catalyst (phosphoric acid, cobalt salts).

Potential Exposure

Methyl acetate is used as a solvent in lacquers and paint removers; and as an intermediate in pharmaceutical manufacture.

First aid

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 min, 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 2448 h after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a corticosteroid spray.

Environmental Fate

Photolytic. A rate constant of 2.00 x 10-13 cm3/molecule?sec was reported for the reaction of methyl acetate and OH radicals in aqueous solution (Wallington et al., 1988b).
Chemical/Physical. Slowly hydrolyzes in water yielding methyl alcohol and acetic acid (NIOSH, 1997). The estimated hydrolysis half-life in water at 25 °C and pH 7 is 2.5 yr (Mabey and Mill, 1978).
At an influent concentration of 1,030 mg/L, treatment with GAC resulted in an effluent concentration of 760 mg/L. The adsorbability of the carbon used was 54 mg/g carbon (Guisti et al., 1974).

storage

(1) Color Code—Red: Flammability Hazard: Store in a flammable liquid storage area or approved cabinet away from ignition sources and corrosive and reactive materials. (2) Color Code—Yellow Stripe (strong reducing agent): Reactivity Hazard; Store separately in an area isolated from flammables, combustibles, or other yellow coded materials. Prior to working with this chemical you should be trained on its proper handling and storage. Before entering confined space where this chemical may be present, check to make sure that an explosive concentration does not exist. Methyl acetate must be stored to avoid contact with strong oxidizers (such as chlorine, bromine, and fluorine) and strong acids (such as hydrochloric, sulfuric and nitric), since violent reactions occur. Store in tightly closed containers in a cool, well-ventilated area away from strong alkalis and nitrates. Sources of ignition, such as smoking and open flames, are prohibited where methyl acetate is used, handled, or stored in a manner that could create a potential fire or explosion hazard. Use only nonsparking tools and equipment, especially when opening and closing containers of methyl acetate.

Shipping

UN1231 Methyl acetate, Hazard Class: 3; Labels: 3-Flammable liquid.

Purification Methods

Methanol in methyl acetate can be detected by measuring its solubility in water. At 20o, the solubility of methyl acetate in water is ca 35g per 100mL, but 1% MeOH confers complete miscibility. Methanol can be removed by conversion to methyl acetate, by refluxing for 6hours with acetic anhydride (85mL/L), followed by fractional distillation. Acidic impurities can be removed by shaking with anhydrous K2CO3 and distilling. An alternative treatment is with acetyl chloride, followed by washing with concentrated NaCl and drying with CaO or MgSO4. (Solid CaCl2 cannot be used because it forms a crystalline addition compound.) Distillation from copper stearate destroys peroxides. Free alcohol or acid can be eliminated from methyl acetate by shaking with strong aqueous Na2CO3 or K2CO3 (three times), then with aqueous 50% CaCl2 (three times), saturated aqueous NaCl (twice), drying with K2CO3 and distilling it from P2O5. [Beilstein 2 IV 122.]

Incompatibilities

Vapor may form explosive mixture with air. A Strong reducing agent. Incompatible water, acids, nitrates, strong oxidizers; alkalis. Attacks some plastics. Attacks many metals in presence of water. Reacts slowly with water, forming acetic acid and methanol. Decomposes in heat; on contact with air, bases, strong oxidizers; UV-light; possible fire and explosion hazard

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.

Methyl acetate Preparation Products And Raw materials

Raw materials

Dehydrolyzing agent Acetic acid Methanol

Preparation Products

ethyl 3-(2,2-dichlorovinyl)-2,2-dimethyl-1-cyclopropanecarboxylate METHYL 3-(THIEN-2-YL)ACRYLATE Methyl nicotinoylacetate Clopidogrel Sulindac dimethyl trans，trans-chrysanthemumdicarboxylate methyl(±)cis，trans-2，2-dimethyl-3-(2-methyl-1-propenyl cyclopropane carboxylate) Lornoxicam METHYL 3-(2,2-DICHLOROVINYL)-2,2-DIMETHYL-(1-CYCLOPROPANE)CARBOXYLATE Misoprostol Benalaxyl Ethyl chrysanthemumate
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View Lastest Price from Methyl acetate manufacturers

Yujiang Chemical (Shandong) Co.,Ltd.
Product
Methyl Acetate 79-20-9
Price
US $980.00/T
Min. Order
0.1T
Purity
98%
Supply Ability
20T
Release date
2024-04-25
Shanghai Longyu Biotechnology Co., Ltd.
Product
Methyl acetate 79-20-9
Price
US $1.00/g
Min. Order
1g
Purity
99
Supply Ability
20tons
Release date
2021-12-04
ANHUI WITOP BIOTECH CO., LTD
Product
Methyl acetate 79-20-9
Price
US $1.00/g
Min. Order
1g
Purity
99%
Supply Ability
10 tons
Release date
2021-03-20

79-20-9, Methyl acetateRelated Search:

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