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Methyl tert-butyl ether

Methyl tert-butyl ether appears as a colorless liquid with a distinctive anesthetic-like odor. Vapors are heavier than air and narcotic. Boiling point 131 °F. Flash point 18 °F. Less dense than water and miscible in water. Used as a octane booster in gasoline.

  • Synonyms: MTBE, MTB, 2-Methoxy-2-methylpropane, Methyl tert-butyl ether
  • CAS #: 1634-04-4
  • EC Number: 216-653-1
  • Molar Mass: 88.15 g/mol
  • Chemical Formula: (CH₃)₃COCH₃
  • Hill Formula: C₅H₁₂O
SKU: JY2301241809 Category: Tags: , Manufacturer and Supplier: Subsidiary of Junyuan Petroleum Group -

Description

Methyl tertiary-butyl ether (MTBE), also known as methyl tert-butyl ether and tert-butyl methyl ether, is an organic compound with a structural formula (CH3)3COCH3. MTBE is a volatile, flammable, and colorless liquid that is sparingly soluble in water. Primarily used as a fuel additive, MTBE is blended into gasoline to increase its octane rating and knock resistance, and reduce unwanted emissions.

tert-Butyl Methyl Ether for HPLC, 99.5%

(Methyl Tert-butyl Ether, MTBE)
HSN Code : 29091990
Molecular Weight : 88.15
Storage : Room Temperature
Shelf Life : 36 Months

Key Spec Table

CAS # EC Number Hill Formula Chemical Formula Molar Mass
1634-04-4 216-653-1 C₅H₁₂O (CH₃)₃COCH₃ 88.15 g/mol

About This Substance
Helpful information
This substance is used by consumers, in articles, by professional workers (widespread uses), in formulation or re-packing, at industrial sites and in manufacturing.

Description
Catalogue Number JY2301241809
Synonyms MTBE, MTB, 2-Methoxy-2-methylpropane, Methyl tert-butyl ether
Description tert-Butyl methyl ether

Consumer Uses
This substance is used in the following products: fuels.
Other release to the environment of this substance is likely to occur from: outdoor use, indoor use (e.g. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners), indoor use in close systems with minimal release (e.g. cooling liquids in refrigerators, oil-based electric heaters) and outdoor use in close systems with minimal release (e.g. hydraulic liquids in automotive suspension, lubricants in motor oil and break fluids).

Product Information
CAS number 1634-04-4
EC index number 603-181-00-X
EC number 216-653-1
Hill Formula C₅H₁₂O
Chemical formula (CH₃)₃COCH₃
Molar Mass 88.15 g/mol
HS Code 2909 19 90
Structure formula Image

Article service life
Other release to the environment of this substance is likely to occur from: outdoor use in long-life materials with low release rate (e.g. metal, wooden and plastic construction and building materials).
This substance can be found in complex articles, with no release intended: vehicles.

Methyl-t-Butyl Ether, AR

– For general analytical applications
– Purity meets the requirement of ACS Standard

Synonym: Tert-Butyl methyl ether, 1, 1-Dimethylethyl methyl ether, 2-Methoxy-2-methylpropane, Methyl-1,1-dimethylethyl ether, tert-Butoxymethane, 2-Methyl-2-methoxypropane, MtBE, 2-Methyl butane-2-ol

Widespread uses by professional workers
This substance is used in the following products: fuels and laboratory chemicals. This substance is used in the following areas: health services and scientific research and development. This substance is used for the manufacture of: and chemicals. Other release to the environment of this substance is likely to occur from: outdoor use and indoor use (e.g. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners).

Physicochemical Information
Boiling point 55.3 °C (1013 hPa)
Density 0.74 g/cm3 (20 °C)
Explosion limit 1.5 – 8.5 %(V)
Flash point -28 °C
Ignition temperature 460 °C
Melting Point -108.6 °C
Vapor pressure 330 hPa (25 °C)
Viscosity kinematic 0.409 mm2/s (40 °C) no data available
Solubility 42 g/l
Toxicological Information
LD 50 oral LD50 Rat > 2000 mg/kg
LD 50 dermal LD50 Rabbit > 2000 mg/kg

Formulation or re-packing
This substance is used in the following products: fuels and laboratory chemicals.
Release to the environment of this substance can occur from industrial use: formulation of mixtures and manufacturing of the substance.
Uses at industrial sites
This substance is used in the following products: pharmaceuticals, perfumes and fragrances, laboratory chemicals, fuels and pH regulators and water treatment products.
This substance has an industrial use resulting in manufacture of another substance (use of intermediates).
This substance is used in the following areas: formulation of mixtures and/or re-packaging.
This substance is used for the manufacture of: chemicals and rubber products.
Release to the environment of this substance can occur from industrial use: in processing aids at industrial sites, as an intermediate step in further manufacturing of another substance (use of intermediates), of substances in closed systems with minimal release, as processing aid and as processing aid.
Other release to the environment of this substance is likely to occur from: indoor use as reactive substance.

Hazard Statement(s) H225: Highly flammable liquid and vapour.
H315: Causes skin irritation.
Precautionary Statement(s) P210: Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233: Keep container tightly closed.
P240: Ground and bond container and receiving equipment.
P241: Use explosion-proof electrical/ ventilating/ lighting equipment.
P242: Use non-sparking tools.
P303 + P361 + P353: IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water.
P403 + P233: Store in a well-ventilated place. Keep container tightly closed.
Signal Word Danger
RTECS KN5250000
Storage class 3 Flammable liquids
WGK WGK 1 slightly hazardous to water
Disposal 1
Strongly contaminated halogen-free organic solvents: container A.
Safety Information
Categories of danger highly flammable, irritant
Storage and Shipping Information
Storage Store at +2°C to +30°C.
Transport Information
Declaration (railroad and road) ADR, RID UN 2398 , 3, II
Declaration (transport by air) IATA-DGR UN 2398 , 3, II
Declaration (transport by sea) IMDG-Code UN 2398 , 3, II
Specifications
Purity (GC) ≥ 99.9 %
Evaporation residue ≤ 0.0002 %
Water ≤ 0.01 %
Color ≤ 10 Hazen
Acidity ≤ 0.0002 meq/g
Alkalinity ≤ 0.0002 meq/g
Fluorescence (as quinine at 254 nm) ≤ 1.0 ppb
Fluorescence (as quinine at 365 nm) ≤ 1.0 ppb
Transmission (at 215 nm) ≥ 40 %
Transmission (at 235 nm) ≥ 55 %
Transmission (at 240 nm) ≥ 60 %
Transmission (at 255 nm) ≥ 85 %
Transmission (at 260 nm) ≥ 90 %
Transmission (from 280 nm) ≥ 98 %
Absorbance (at 215 nm) ≤ 0.40
Absorbance (at 235 nm) ≤ 0.26
Absorbance (at 240 nm) ≤ 0.22
Absorbance (at 255 nm) ≤ 0.07
Absorbance (at 260 nm) ≤ 0.05
Absorbance (from 280 nm) ≤ 0.01

Manufacture
Release to the environment of this substance can occur from industrial use: manufacturing of the substance and formulation of mixtures.

Danger! According to the harmonised classification and labelling (CLP00) approved by the European Union, this substance is a highly flammable liquid and vapour and causes skin irritation.

Specifications
Molecular Formula : C5H12O
IMDG Identification : UN No.:2398 , IMCO Class No.:3 , Packing Group:II
CAS NO: 1634-04-4
Appearance (Clarity) Clear
Appearance (Colour) Colourless
Appearance (Form) Liquid
Colour (APHA) max. 10
Assay (GC) min. 99.5%
Density (g/ml) @ 20°C 0.740-0.742
Refractive Index (20°C) 1.369-1.370
Boiling Range 55-56°C
Non Volatile Matter max. 0.001%
Acidity (CH3COOH) max. 0.001%
Water (KF) max. 0.05%
%T (Transmission) in a 1cm cell v/s H2O
@215nm ≥10
@225nm ≥30
@250 nm ≥80
@300-350nm ≥99

 

Formula C5H12O
Net Charge 0
Average Mass 88.14820
Monoisotopic Mass 88.08882
InChI InChI=1S/C5H12O/c1-5(2,3)6-4/h1-4H3
InChIKey BZLVMXJERCGZMT-UHFFFAOYSA-N
SMILES COC(C)(C)C
Roles Classification
Chemical Role(s): non-polar solvent

fuel additive

Any additive that enhances the efficiency of fuel.
Biological Role(s): metabolite

Any intermediate or product resulting from metabolism. The term ‘metabolite’ subsumes the classes commonly known as primary and secondary metabolites.
Application(s): non-polar solvent
IUPAC Name
tert-butyl methyl ether

HIGH PURITY- METHYL TERTIARY BUTYL ETHER (HP-MTBE), CAS 1634-04-4

Methyl Tertiary Butyl Ether (MTBE)

Formed by the blending of chemicals like methanol and isobutylene, Methyl tert-butyl ether (MTBE) is a colorless liquid and has a distinctive odour. The vapors of this chemical are denser than both narcotic and air. The boiling point of MTBE is 131-degree F with the flashpoint being 18-degree F. MTBE is miscible in water as it is less dense than water. This is why this chemical can be used as an octane booster for gasoline.

Methyl tert-butyl ether (MTBE) has been used since the 1980s as an additive to achieve a more efficient burning, especially for unleaded petrol. It can also be used for medical reasons to dissolve the gall bladder stone. MTBE is directly delivered to the patient’s gall bladder with the help of tubes. The tubes are surgically inserted into the patient for safety reasons.

Methyl and tert butyl are the two-alkyl components in methyl butyl ether. This solution is a metabolite, a fuel additive and a non-polar solvent. When combined with gasoline, MTBE is known to increase the oxygen and octane levels and reduce pollution, which is remarkable.

Methyl tert-butyl ether (MTBE) has several medical applications as well and is used as a solvent for synthesizing APIs.

Synonyms Sources
2-Methoxy-2-methylpropane ChemIDplus
2-Methyl-2-methoxypropane ChemIDplus
Methyl 1,1-dimethylethyl ether NIST Chemistry WebBook
Methyl t-butyl ether ChemIDplus
Methyl tert-butyl ether KEGG COMPOUND
Methyl tertiary-butyl ether ChemIDplus
MTBE ChEBI
t-Butyl methyl ether ChemIDplus
tert-Butyl methyl ether KEGG COMPOUND
tert-C4H9OCH3 NIST Chemistry WebBook
Registry Numbers Types Sources
1634-04-4 CAS Registry Number ChemIDplus
1730942 Beilstein Registry Number Beilstein
1730942 Reaxys Registry Number Reaxys
773738 Gmelin Registry Number Gmelin
TYPICAL SPECIFICATIONS
MARKET: Reagents, Solvents, Featured Stocked Products
MOLECULAR WEIGHT: 88.15
APPEARANCE: Colorless liquid
DENSITY: 0.74 g/cm3
REFRACTIVE INDEX: 1.369
ASSAY: 99.8 %
WATER CONTENT: <0.003 %
BOILING POINT: 55 – 56 °C
MELTING POINT: -110 °C
FLASH POINT: -28 °C

Methyl Tertiary Butyl Ether

Purity %
98%
Usage/Application
Laboratory
Chemical Formula
C5H12O
Physical State
Liquid
Density
740 kg/m3
Boiling Point
55.2degC
Solubility in water
26 kg/m3
Technical Specifications
Supplier Junyuan Petroleum Group
Grade Analytical
Packaging Drum
Pack Size 200L drum
CAS No 1634-04-4
MELTING POINT: -109 °C
BOILING POINT: 55.2 °C
DENSITY: 0.740 kg/l
SOLUBILITY: water 51 g/l at 20 °C
REFRACTIVE INDEX: 20/D 1.3689
PHYSICAL DESCRIPTION: liquid
PRODUCT CODE: JY2301241809
PRODUCT NAME: tert-Butyl Methyl Ether for analysis, ACS
QUALITY NAME: for analysis, ACS
SPECIFICATIONS:
Minimum assay (G.C.): 99.8%
Identity: IR passes test
Density 20/4: 0.739-0.742
Refractive Index n 20/D: 1.368-1.370Maximum limit of impurities
APHA colour: 10
Acidity: 0.0005 meq/g
Alkalinity: 0.0002 meq/g
Non-volatile matter: 0.001 %
Peroxides (as H2O2): 0.0001 %*
2-Methyl-2-Propanol (G.C.): 0.05%
Aldehydes (as HCHO): 0.001%
Methanol (G.C.): 0.01%
Water (H2O): 0.03 %
UV Spectrum (1cm cell; Ref.: water):
Transmittance at 240 nm: ≥50%
Transmittance at 255 nm: ≥80%
Transmittance at 280 nm: ≥98%
Al: 0.0005 %
Ca: 0.00005 %
Cd: 0.000005 %
Co: 0.000002 %
Cr: 0.000002 %
Cu: 0.000002 %
Fe: 0.00001 %
Mg: 0.00001 %
Mn: 0.000002 %
Ni: 0.000002 %
Pb: 0.00001 %
Zn: 0.00001 %
* At the moment of the batch analysis.
HAZARD PICTOGRAMS
UN: 2398
CLASS/PG: 3/II
ADR: 3/II
IMDG: 3/II
IATA: 3/II
WGK: 1
STORAGE: Room Temperature.
SIGNAL WORD: Danger
GHS SYMBOLS:
GHS02
GHS07
H PHRASES:
H225
H315
P PHRASES:
P210
P233
P240
P241
P242
P243
P264
P280
P302+P352
P303+P361+P353
P321
P332+P313
P362
P370+P378
P403+P235
P501
MASTER NAME: tert-Butyl Methyl Ether
SYNONYMS LONG TEXT: 1,1-Dimethyl ethyl methyl ether, 2-Methoxy-2-Methylpropane, Methyl-ter-Butyl Ether, MTB, MTBE
EINECS: 216-653-1
CS: 29091990
INDEX NR.: 603-181-00-X

Junyuan Petroleum Group’s Methyl tert-butyl ether, for HPLC, 99.7% Cas 1634-04-4 – used as an oxygenate to raise the octane number and to replace tetraethyllead (TEL).

Common Name Methyl-tert-butyl ether
Description Methyl-tert-butyl ether, also known as tert-butyl methyl ether, methyl t-butyl ether or MTBE, is classified as a member of the dialkyl ethers. Dialkyl ethers are organic compounds containing the dialkyl ether functional group, with the formula ROR’, where R and R’ are alkyl groups. Methyl-tert-butyl ether is considered to be soluble (in water) and basic. It is used as a gasoline additive. Exposure may occur by breathing air contaminated with auto exhaust or gasoline fumes while refueling autos. Respiratory irritation, dizziness, and disorientation have been reported by some motorists and occupationally exposed workers. Acute (short-term) exposure of humans to methyl tert-butyl ether also has occurred during its use as a medical treatment to dissolve cholesterol gallstones. Chronic (long-term) inhalation exposure to methyl-tert-butyl ether has resulted in central nervous system (CNS) effects, respiratory irritation, liver and kidney effects, and decreased body weight gain in animals. United States Environmental Protection Agency has not classified methyl-tert-butyl ether with respect to potential carcinogenicity. (ChemoSummarizer)

CAS name: tert.-butyl methyl ether
CAS number: 1634-04-4
Formula: C5H12O
Synonyms:
MTBE
Methyl-tert.-butylether
2-Methyl-2-methoxypropane
C4 Chemicals
Fuel

Physical and Chemical Properties of MTBE:

CAS number: 1634-04-4
Chemical formula: C5H12O
Molar mass: 88.150 g·mol−1
Appearance: colourless liquid
Density: 0.7404 g/cm³
Melting point: −109 °C (−164 °F; 164 K)
Boiling point: 55.2 °C (131.4 °F; 328.3 K)
Solubility in water: 26 g/L (20 °C)[1]
Viscosity: 0.36 cP at 25 °C

Molecular weight: 88.15 g/mol
Comment Methyl-tert-butyl ether/MTBE is a flammable, non auto-oxidizable, clear, colourless liquid of low viscosity with a characteristic terpene-like odour. It is miscible with organic solvents in all ratios, partly miscible with water. MTBE is chemically stable in alkaline medium as well as in the presence of weak acids, air and oxygen.
Application: organic compound, Ether of acyclic hydrocarbon, Fuel additive, octane improver, Automotive, Automotive and car making
Description: MTBE is mainly a component in gasoline enhancing octane properties. A minor use for high purity MTBE is as a process solvent for production of various products.

    • SPECIFICATIONS
Assay %      : 99.8%
Assay Notes      : HPLC/Spectro
Boiling Point      : 56°C
Chemical Formula      : (CH3)3COCH3
Color      : Colorless
Flash Point      : -28°C
Melting Point      : -110°C
Molecular Weight      : 88.15g/mol
Packaging Type      : Steel Drum
Physical State      : Liquid
Refractive Index      : 1.36nD
Shelf Life      : 36 Months
Size      : 200L
Solubility Information      : Soluble in Water
Synonyms      : MTBE, Methyl t-Butyl Ether, 2-Methoxy-2-methylpropane, t-Butyl Methyl Ether, Methyl 1,1-dimethyl Ethyl Ether
Lot Purity
Lot Number Purity
JY2301241809 99.50
Lot Expiration
Lot Number Expiration
JY2301241809 07/31/25
Alternate Name(s) Methyl tert-butyl ether, MTBE
Stock Status In Stock
Size 200L
Molecular Formula C5-H12-O
Molecular Weight 88.15
Concentration and Solvent density = 0.7404
Sample COA Please email us for the details.

Storage Temperature: +20°C
Shipping Temperature: +20°C
Country of Origin: CHINA
Transport Restrictions: Air Excepted
Tariff Code: 29051100

Product Description

Catalogue Number JY2301241809
Chemical Name tert-Butyl Methyl Ether
Synonyms 1,1-Dimethylethyl Methyl Ether; 2-Methoxy-2-methylpropane; 2-Methyl-2-methoxypropane; MTBE; Methyl 1,1-dimethylethyl Ether; Methyl tert-Butyl Ether; Methyl Tertiary Butyl Ether; tert-Butoxymethane; tert-Butyl Methyl Ether
CAS Number 1634-04-4
Molecular Formula C₅H₁₂O
Appearance Colourless Liquid
Molecular Weight 88.15
Storage 20°C
Solubility Most Organic Solvents
Stability Volatile
Category Building Blocks; Miscellaneous;
Applications tert-Butyl Methyl Ether is used in the preparation of gasolines, acting as an oxygenate to improve octane index and combustion efficiency (1). A mutagenic component of the mixtures present in the environment through degredation (2). Drinking water contaminant candidate list 3 (CCL 3) compound as per United States Environmental Protection Agency (EPA), environmental, and food contaminants.
Not a dangerous good if item is equal to or less than 1g/ml and there is less than 100g/ml in the package

tert-Butyl methyl ether, HPLC Grade, 99+%

MDL: MFCD00008812
EINECS: 216-653-1

Chemical Properties

Formula: (CH3)3COCH3
Formula Weight: 88.15
Form: Liquid
Melting point: -109°
Boiling Point: 55-56°
Flash Point: -25°(-13°F)
Density: 0.742
Refractive Index: 1.3690
Storage & Sensitivity: Ambient temperatures.
Solubility: Slightly soluble in water. Highly soluble in ethanol and ethyl ether.

Grade Specifications

Maximum level of impurities: Evaporation residue 2ppm, H2O 0.05%

Applications

Used as a Chromatography solvent. Acts as a fuel component in fuel for gasoline engines. They raise the oxygen content of gasoline(oxygenates).

Notes

Store in a cool, dry, well-ventilated area. It is hygroscopic in nature.

GHS Hazard and Precautionary Statements

Hazard Statements: H225-H303-H315

Highly flammable liquid and vapour. May be harmful if swallowed. Causes skin irritation.

Precautionary Statements: P210-P240-P241-P242-P243-P261-P264b-P270-P271-P280-P303+P361+P353-P304+P340-P305+P351+P338-P312-P362+P364-P403+P233-P501c

Keep away from heat/sparks/open flames/hot surfaces. – No smoking. Ground/bond container and receiving equipment. Use explosion-proof electrical/ventilating/lighting/ equipment. Use only non-sparking tools. Take precautionary measures against static discharge. Avoid breathing dust/fume/gas/mist/vapours/spray. Wash face, hands and any exposed skin thoroughly after handling Do not eat, drink or smoke when using this product. Use only outdoors or in a well-ventilated area. Wear protective gloves/protective clothing/eye protection/face protection. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Call a POISON CENTER or doctor/physician if you feel unwell. Take off contaminated clothing and wash before reuse. And wash it before reuse. Store in a well-ventilated place. Keep container tightly closed. Dispose of contents/ container to an approved waste disposal plant.

Other References

Merck: 14,6032
Beilstein: 1730942
Hazard Class: 3
Packing Group: II
Harmonized Tariff Code: 2909.19
TSCA: Yes
RTECS: KN5250000

Specifications

Property Value
Purity (GC) Min. 99.85 %
IR spectrum complying
Non-volatile matter Max. 0.0001 %
Water (Karl Fischer) Max. 0.02 %
Absorbance at 400 nm Max. 0.005
Absorbance at 300 nm Max. 0.005
Absorbance at 250 nm Max. 0.10
Absorbance at 225 nm Max. 0.50
Absorbance at 210 nm Max. 1.0
Fluorescence (chinin) at 365 nm Max. 1.0 ppb
GC (as heptachlor epoxide) Max. 10 ng/l
Refractive Index n20/D 1.369(lit.)
Autoignition Temperature 705 °F

Properties

Property Value
Boiling Point/Range 55.3 °C (1.013 hPa)
Color Colorless
Density 0.74 g/cm3 (20 °C)
Flashpoint 8.5 %(V)
For Use With (Equipment) For HPLC
Form Liquid
Grade Standard HPLC Solvents
Incompatible Materials Oxidizing agents, Strong acids, Strong bases, Halogens
Lower Explosion Limit 1.5 %(V)
Melting Point/Range -109 °C
Partition Coefficient 1.06 (20 °C)
Purity Percentage 99.9
Purity Details >=99.9%
Solubility in Water 42 g/l (20 °C)
Upper Explosion Limit 8.5 %(V)
Vapor Pressure 330 hPa (25 °C)
Viscosity 0.36 mPa.s (20 °C)
pH-Value Not applicable
Product Line Junyuan Petroleum Group
Storage Temperature Ambient

Safety Information

Property Value
Hazard Class 3
Package Group II
UN ID UN2398

Further details of MTBE

Methyl tert-butyl ether (MTBE) is often found in several water sources, especially in urban areas, because of the leaks in the underground storage tanks of gasoline. MTBE can be felt in the air nearby if there are fuel facilities. The air gets exposed to this chemical when people are fuelling their vehicles.

Methyl tert-butyl ether is an essential chemical that is being used in several industries around the globe. There are several benefits of MTBE. In addition, purity and superior quality MTBE can be used for several purposes in the industries to reach the desired goals.

Junyuan Petroleum Group is the world leader in the manufacturing and supply of the methyl tert-butyl ether. We produce high purity MTBE and supply it across the globe for a wide variety of applications.

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