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2-Methylbutane

Product Name
2-Methylbutane
CAS No.
78-78-4
Chemical Name
2-Methylbutane
Synonyms
JJDW ;R 601A;Isopentan;iso-C5H12;iso-Pentan;ISOPENTANE;NSC 119476;methylbutane;2Methylbutan;ISOPROPENTANE
CBNumber
CB5854378
Molecular Formula
C5H12
Formula Weight
72.15
MOL File
78-78-4.mol
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2-Methylbutane Property

Melting point:
-160 °C
Boiling point:
30 °C(lit.)
Density 
0.62 g/mL at 25 °C(lit.)
vapor density 
2.6 (vs air)
vapor pressure 
11.17 psi ( 20 °C)
refractive index 
n20/D 1.354(lit.)
Flash point:
−51 °C
storage temp. 
2-8°C
solubility 
0.048g/l
pka
>14 (Schwarzenbach et al., 1993)
form 
Liquid
color 
Clear colorless
explosive limit
1.3-7.6%(V)
Odor Threshold
1.3ppm
Water Solubility 
Miscible with water, hydrocarbons, oils, alcohol and ether.
λmax
λ: 192 nm Amax: 1.00
λ: 210 nm Amax: 0.30
λ: 220 nm Amax: 0.07
λ: 240-400 nm Amax: 0.01
BRN 
1730723
Henry's Law Constant
(atm?m3/mol): 1.24 at 25 °C (approximate - calculated from water solubility and vapor pressure)
Exposure limits
ACGIH TLV: TWA 600 ppm (adopted).
Stability:
Stable. Extremely flammable. Incompatible with strong oxidizing agents. Vapour-air mixtures explosive in certain proportions. Incompatible with rubber, various plastics. The vapour, being heavier than air, may roll over surfaces and collect in low points. Note low flash point.
CAS DataBase Reference
78-78-4(CAS DataBase Reference)
NIST Chemistry Reference
Butane, 2-methyl-(78-78-4)
EPA Substance Registry System
2-Methylbutane (78-78-4)
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Safety

Hazard Codes 
F+,Xn,N
Risk Statements 
12-51/53-65-66-67
Safety Statements 
9-16-29-33-61-62
RIDADR 
UN 1265 3/PG 1
WGK Germany 
2
RTECS 
EK4430000
Autoignition Temperature
788 °F
TSCA 
Yes
HazardClass 
3
PackingGroup 
I
HS Code 
29011000
Hazardous Substances Data
78-78-4(Hazardous Substances Data)
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H224Extremely flammable liquid and vapour

H226Flammable liquid and vapour

H302Harmful if swallowed

H304May be fatal if swallowed and enters airways

H315Causes skin irritation

H318Causes serious eye damage

H335May cause respiratory irritation

H336May cause drowsiness or dizziness

H411Toxic to aquatic life with long lasting effects

Precautionary statements

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

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P273Avoid release to the environment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P331Do NOT induce vomiting.

P301+P310IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P370+P378In case of fire: Use … for extinction.

P405Store locked up.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
270342
Product name
2-Methylbutane
Purity
for HPLC, ≥99.5%
Packaging
1l
Price
$202
Updated
2020/08/18
Sigma-Aldrich
Product number
270342
Product name
2-Methylbutane
Purity
for HPLC, ≥99.5%
Packaging
6x1l
Price
$985
Updated
2020/08/18
Alfa Aesar
Product number
019387
Product name
2-Methylbutane, 99+%
Packaging
500ml
Price
$39.6
Updated
2020/06/24
Alfa Aesar
Product number
019387
Product name
2-Methylbutane, 99+%
Packaging
*4x500ml
Price
$112
Updated
2020/06/24
Sigma-Aldrich
Product number
PHR1661
Product name
Isopentane Solution
Purity
Pharmaceutical Secondary Standard; Certified Reference Material
Packaging
2ml
Price
$125
Updated
2020/08/18
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2-Methylbutane Chemical Properties,Usage,Production

Chemical Properties

2-Methylbutane (isopentane), C5H12, is a flammable liquid and exhibits physical properties very similar to those of pentane. It has been detected in urban air.

2-Methylbutane is an alkane that is butane substituted by a methyl group at position 2.  It has a higher BP than butane because, although similarly branched, it has a higher MW. A useful analogy for comparing molecules with the same size of longest chain is that of cylindrical-shaped molecules. It has a role as a refrigerant. Biological samples flash frozen for example with a combination of liquid nitrogen and methylbutane can then be used for storage, cryosection, etc.

Physical properties

Clear, colorless, watery, very flammable liquid with a pleasant odor. Evaporates quickly when spilled. An odor threshold concentration of 1.3 ppmv was reported by Nagata and Takeuchi (1990).

Uses

Isopentane is an organic, branched-chain alkane with five carbon atoms. 2-Methylbutane undergoes catalytic dehydrogenation in the presence of chromia-alumina catalyst to form isoamylenes, which can undergo further dehydrogenation to form isoprene. It may also be used as a solvent in the preparation of trans-Bis(triethylphosphine) (hydroxy carbonyl) (phenyl) platinum(II), a metallacarboxylic acid.

Uses

Solvent, manufacture of chlorinated derivatives, blowing agent for polystyrene.

Definition

ChEBI: An alkane that is butane substituted by a methyl group at position 2.

Production Methods

Isopentane is produced by fractional distillation of natural gas liquids and crude oil.

General Description

Watery colorless liquid with a gasoline-like odor. Floats on water. Flammable, irritating vapor is produced. Boiling point is 82°F.

Air & Water Reactions

Highly flammable. Insoluble in water.

Reactivity Profile

2-Methylbutane is a fire and explosion hazard when in contact with oxidizing agents. .

Hazard

Highly flammable, dangerous fire risk.

Health Hazard

Inhalation causes irritation of respiratory tract, cough, mild depression, irregular heartbeat. Aspiration causes severe lung irritation, coughing, pulmonary edema; excitement followed by depression. Ingestion causes nausea, vomiting, swelling of abdomen, headache, depression.

Fire Hazard

Behavior in Fire: Highly volatile liquid. Vapors may explode when mixed with air.

Safety Profile

Mddly toxic and narcotic by inhalation. See also PENTANE. Flammable liquid. A very dangerous fire and explosion hazard when exposed to heat, flame, or oxidzers. Keep away from sparks, heat, or open flame; can react with oxidizing materials. To fight fire, use foam, CO2, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes.

Source

A constituent in gasoline. Harley et al. (2000) analyzed the headspace vapors of three grades of unleaded gasoline where ethanol was added to replace methyl tert-butyl ether. The gasoline vapor concentrations of 2-methylbutane in the headspace were 24.1 wt % for regular grade, 24.8 wt % for mid-grade, and 26.0 wt % for premium grade.
Schauer et al. (2001) measured organic compound emission rates for volatile organic compounds, gas-phase semi-volatile organic compounds, and particle-phase organic compounds from the residential (fireplace) combustion of pine, oak, and eucalyptus. The gas-phase emission rate of 2-methylbutane was 5.6 mg/kg of pine burned. Emission rates of 2-methylbutane were not measured during the combustion of oak and eucalyptus.
California Phase II reformulated gasoline contained 2-methylbutane at a concentration of 79.2g/kg. Gas-phase tailpipe emission rates from gasoline-powered automobiles with and without catalytic converters were 3.69 and 148 μg/km, respectively (Schauer et al., 2002).

Environmental Fate

Photolytic. When synthetic air containing gaseous nitrous acid and 2-methylbutane was exposed to artificial sunlight (λ = 300–450 nm), acetone, acetaldehyde, methyl nitrate, peroxy-acetal nitrate, propyl nitrate, and pentyl nitrate were formed (Cox et al., 1980).
Based upon a photooxidation rate constant of 3.90 x 10-12 cm3/molecule?sec with OH radicals in summer daylight, the atmospheric lifetime is 36 h (Altshuller, 1991). At atmospheric pressure and 300 K, Darnall et al. (1978) reported a rate constant of 3.78 x 10-12 cm3/molecule?sec for the same reaction.
Cox et al. (1980) reported a rate constant of 5.0 x 10-11 cm3/molecule?sec for the reaction of gaseous 2-methylbutane with OH radicals based on a value of 8 x 10-12 cm3/molecule?sec for the reaction of ethylene with OH radicals.
Chemical/Physical. Complete combustion in air produces carbon dioxide and water vapor.
2-Methylbutane will not hydrolyze because it does not contain a hydrolyzable functional group.

Purification Methods

Stir isopentane for several hours in the cold with conc H2SO4 (to remove olefinic impurities), then wash it with H2O, aqueous Na2CO3 and H2O again. Dry it with MgSO4 and fractionally distil it using a Todd column packed with glass helices. Material transparent down to 180nm is obtained by distilling from sodium wire, and passing through a column of silica gel which had previously been dried in place at 350o for 12hours before use. [Potts J Phys Chem 20 809 1952, Beilstein 1 IV 320.]

2-Methylbutane Preparation Products And Raw materials

Raw materials

Preparation Products

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2-Methylbutane Suppliers

J & K SCIENTIFIC LTD.
Tel
010-82848833- ;010-82848833-
Fax
86-10-82849933
Email
jkinfo@jkchemical.com;market6@jkchemical.com
Country
China
ProdList
96815
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76
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel
21-61259100-
Fax
86-21-61259102
Email
sh@meryer.com
Country
China
ProdList
40268
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62
Alfa Aesar
Tel
400-610-6006; 021-67582000
Fax
021-67582001/03/05
Email
saleschina@alfa-asia.com
Country
China
ProdList
30163
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TCI (Shanghai) Development Co., Ltd.
Tel
021-67121386 / 800-988-0390
Fax
021-67121385
Email
Sales-CN@TCIchemicals.com
Country
China
ProdList
24555
Advantage
81
Energy Chemical
Tel
021-58432009
Fax
021-58436166-800
Email
sales8178@energy-chemical.com
Country
China
ProdList
44026
Advantage
61
JinYan Chemicals(ShangHai) Co.,Ltd.
Tel
13817811078,021-50426030
Fax
86-021-50426522,50426273
Email
sales@jingyan-chemical.com
Country
China
ProdList
10009
Advantage
60
Adamas Reagent, Ltd.
Tel
400-600-9262
Email
bxy@titansci.com
Country
China
ProdList
13918
Advantage
59
Chengdu XiYa Chemical Technology Co., Ltd.
Tel
;
Fax
0539-6365991
Email
sale@xiyashiji.com;3007716753@qq.com
Country
China
ProdList
10576
Advantage
57
Sinopharm Chemical Reagent Co,Ltd.
Tel
86-21-63210123
Fax
86-21-63290778 86-21-63218885
Email
sj_scrc@sinopharm.com
Country
China
ProdList
9848
Advantage
79
Maya High Purity Chemicals
Tel
+86 (573) 82222445 (0)18006601000 QQ:452520369
Fax
+86 (573) 82222643
Email
sales@maya-r.com
Country
China
ProdList
11740
Advantage
57
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View Lastest Price from 2-Methylbutane manufacturers

career henan chemical co
Product
2-Methylbutane 78-78-4
Price
US $1.00/kg
Min. Order
1g
Purity
99%
Supply Ability
100KG
Release date
2018-12-21

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