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ISOBUTYLENE

Product Name
ISOBUTYLENE
CAS No.
115-11-7
Chemical Name
ISOBUTYLENE
Synonyms
Isobuten;iso-C4H8;ISOBUTENE;SOBUTYLENE;ISOBUTYLENE;Methylpropen;Isobutene(MP);Methylpropene;HP-ISOBUTYLENE;gamma-Butylene
CBNumber
CB4763080
Molecular Formula
C4H8
Formula Weight
56.11
MOL File
115-11-7.mol
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ISOBUTYLENE Property

Melting point:
−140 °C
Boiling point:
−6.9 °C(lit.)
Density 
0.5879
vapor density 
2 (vs air)
vapor pressure 
3278 mm Hg ( 37.7 °C)
refractive index 
1.3811
Flash point:
-80 °C
Odor Threshold
10ppm
Water Solubility 
263mg/L(25 ºC)
FreezingPoint 
-140.34℃
Merck 
14,5141
BRN 
773645
Henry's Law Constant
0.20, 0.26, 0.33, and 0.41 at 30, 40, 50, and 60 °C, respectively (Leung et al., 1987:Zhang et al., 2002)
Stability:
Stable. Highly flammable - readily forms an explosive mixture with air. Incompatible with strong oxidizing agents.
InChIKey
VQTUBCCKSQIDNK-UHFFFAOYSA-N
CAS DataBase Reference
115-11-7(CAS DataBase Reference)
EPA Substance Registry System
Isobutene (115-11-7)
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Safety

Hazard Codes 
F+
Risk Statements 
12
Safety Statements 
9-16-33
RIDADR 
UN 1055 2.1
WGK Germany 
-
RTECS 
UD0890000
4.5-31
Autoignition Temperature
869 °F
DOT Classification
2.1 (Flammable gas)
HazardClass 
2.1
PackingGroup 
III
HS Code 
29012330
Hazardous Substances Data
115-11-7(Hazardous Substances Data)
Toxicity
LC50 (inhalation) for mice 415 g/m3/2-h, rats 620 g/m3/4-h (quoted, RTECS, 1985).
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H220Extremely flammable gas

H280Contains gas under pressure; may explode if heated

Precautionary statements

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

P377Leaking gas fire: Do not extinguish, unless leak can be stopped safely.

P381Eliminate all ignition sources if safe to do so.

P410+P403Protect from sunlight. Store in a well-ventilated place.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
295469
Product name
2-Methylpropene
Purity
99%
Packaging
100g
Price
$199
Updated
2021/03/22
Sigma-Aldrich
Product number
295469
Product name
2-Methylpropene
Purity
99%
Packaging
1kg
Price
$571
Updated
2021/03/22
TCI Chemical
Product number
I0909
Product name
Isobutene (ca. 8% in Dichloromethane)
Packaging
100mL
Price
$56
Updated
2021/03/22
TCI Chemical
Product number
I0909
Product name
Isobutene (ca. 8% in Dichloromethane)
Packaging
500mL
Price
$165
Updated
2021/03/22
Sigma-Aldrich
Product number
295469
Product name
2-Methylpropene
Purity
99%
Packaging
400g
Price
$628
Updated
2021/03/22
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ISOBUTYLENE Chemical Properties,Usage,Production

Physical properties

Colorless gas with a coal gas-like odor. The odor threshold concentration is 10 ppmv Nagata and Takeuchi (1990).

Uses

Primarily used to produce diisobutylene, trimers, butyl rubber, and other polymers; also to produce antioxidants for foods, packaging, food supplements, and for plastics: Hatch, Pet. Refin. 39, No. 6, 207 (1960).

Definition

ChEBI: An alkene that is prop-1-ene substituted by a methyl group at position 2.

Production Methods

Isobutene is produced in refinery streams by absorption on 65% H2SO4 at about 15C, or by reacting with an aliphatic primary alcohol and then hydrolyzing the resulting ether.

General Description

ISOBUTYLENE is a colorless gas with a faint petroleum-like odor. For transportation ISOBUTYLENE may be stenched. ISOBUTYLENE is shipped as a liquefied gas under its own vapor pressure. Contact with the liquid can cause frostbite. ISOBUTYLENE is easily ignited. Its vapors are heavier than air and a flame can flash back to the source of leak very easily. The leak can either be a liquid or vapor leak. ISOBUTYLENE can asphyxiate by the displacement of air. Under prolonged exposure to fire or heat the containers may rupture violently and rocket. ISOBUTYLENE is used in the production of isooctane, a high octane aviation gasoline.

Air & Water Reactions

Highly flammable.

Reactivity Profile

ISOBUTYLENE is incompatible with oxidizers. ISOBUTYLENE polymerizes easily. ISOBUTYLENE reacts easily with numerous materials, such as alkyl halides, halogens, concentrated sulfuric acid, hypochlorous acid, aluminum chloride, carbon monoxide and hydrogen with a cobalt catalyst. Polymerization is catalyzed by aluminum chloride and boron trifluoride.

Hazard

Highly flammable, dangerous fire and explosion risk, explosive limits in air 1.8–8.8%.

Health Hazard

Inhalation of moderate concentrations causes dizziness, drowsiness, and unconsciousness. Contact with eyes or skin may cause irritation; the liquid may cause frostbite.

Fire Hazard

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

Carcinogenicity

Groups of 50 male and 50 female F344/N rats were exposed to isobutene at concentrations of 0, 500, 2000, or 8000 ppm6 h/day 5 days/week for 105 weeks. Groups of 50 male and 50 female B6C3F1 mice were exposed to isobutene at concentrations of 0, 500, 2000, or 8000 ppm 6 h/day, 5 days/week for 105 weeks. Under the conditions of these 2 year inhalation studies, there was some evidence of the carcinogenic activity of isobutene in male F344/N rats based on an increased incidence of follicular cell carcinoma of the thyroid gland. There was no evidence of the carcinogenic activity of isobutene in female F344/N rats or male or female B6C3F1 mice exposed to 500, 2000, or 8000 ppm.

Source

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-methylpropene was 40.1 mg/kg of pine burned. Emission rates of 2-methylbutene were not measured during the combustion of oak and eucalyptus.
California Phase II reformulated gasoline contained 2-methylpropene at a concentration of 170 mg/kg. Gas-phase tailpipe emission rates from gasoline-powered automobiles with and without catalytic converters were 15.6 and 427 mg/km, respectively (Schauer et al., 2002).

Environmental Fate

Photolytic. Products identified from the photoirradiation of 2-methylpropene with nitrogen dioxide in air are 2-butanone, 2-methylpropanal, acetone, carbon monoxide, carbon dioxide, methanol, methyl nitrate, and nitric acid (Takeuchi et al., 1983). Similarly, products identified from the reaction of 2-methylpropene with ozone included acetone, formaldehyde, methanol, carbon monoxide, carbon dioxide, and methane (Tuazon et al., 1997).
The following rate constants were reported for the reaction of 2-methylpropene and OH radicals in the atmosphere: 3.0 x 10-13 cm3/molecule?sec at 300 K (Hendry and Kenley, 1979); 5.40 x 10-11 cm3/molecule?sec (Atkinson et al., 1979); 5.14 x 10-11 at 298 K (Atkinson, 1990). Reported reaction rate constants for 2-methylpropene and ozone in the atmosphere include 2.3 x 10-19 cm3/molecule?sec (Bufalini and Altshuller, 1965); 1.17 x 10-19 cm3/molecule?sec at 300 K (Adeniji et al., 1965); 1.21 x 10-17 cm3/molecule?sec at 298 K (Atkinson, 1990).
Chemical/Physical. Complete combustion in air yields carbon dioxide and water. Incomplete combustion yields carbon monoxide.

Solubility in organics

(mole fraction):
In 1-butanol: 0.131, 0.0695, and 0.0458 at 25, 30, and 70 °C, respectively; chlorobenzene: 0.234, 0.132, and 0.0796 at 25, 30, and 70 °C, respectively; octane: 0.333, 0.184, and 0.119 at 25, 30, and 70 °C, respectively (Hayduk et al., 1988).

Solubility in water

(mole fraction):
In 1-butanol: 0.131, 0.0695, and 0.0458 at 25, 30, and 70 °C, respectively; chlorobenzene: 0.234, 0.132, and 0.0796 at 25, 30, and 70 °C, respectively; octane: 0.333, 0.184, and 0.119 at 25, 30, and 70 °C, respectively (Hayduk et al., 1988).

Purification Methods

Dry isobutene by passage through anhydrous CaSO4 at 0o. Purify it further by freeze-pump-thaw cycles and trap-to-trap distillation. [Beilstein 1 IV 796.]

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ISOBUTYLENE Suppliers

AoboRui (Tianjin) Co., Ltd.
Tel
022-65675308-
Fax
QQ:2722718791
Email
23034325@qq.com
Country
China
ProdList
116
Advantage
55
Shanghai Boyle Chemical Co., Ltd.
Tel
Mr Qiu:021-50182298(Demestic market) Miss Xu:021-50180596(Abroad market)
Fax
+86-21-57758967
Email
sales@boylechem.com
Country
China
ProdList
2213
Advantage
55
J & K SCIENTIFIC LTD.
Tel
010-82848833- ;010-82848833-
Fax
86-10-82849933
Email
jkinfo@jkchemical.com;market6@jkchemical.com
Country
China
ProdList
96815
Advantage
76
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel
21-61259100-
Fax
86-21-61259102
Email
sh@meryer.com
Country
China
ProdList
40264
Advantage
62
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
Email
sales8178@energy-chemical.com
Country
China
ProdList
43495
Advantage
61
Beijing Ouhe Technology Co., Ltd
Tel
010-82967028-
Fax
+86-10-82967029
Email
2355560935@qq.com
Country
China
ProdList
12356
Advantage
60
Secco work (Beijing) chemical technology co., LTD
Tel
010-69755668
Fax
010-69755668
Email
343367102@QQ.COM
Country
China
ProdList
3529
Advantage
54
Shanghai Hanhong Scientific Co.,Ltd.
Tel
021-54306202- ; ;
Email
jerry.ma@hanhonggroup.com;jerry.ma@hanhonggroup.com;jerry.ma@hanhonggroup.com
Country
China
ProdList
43255
Advantage
64
Chengdu XiYa Chemical Technology Co., Ltd.
Tel
;
Fax
0539-6365991
Email
sale@xiyashiji.com;3007716753@qq.com
Country
China
ProdList
10578
Advantage
57
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View Lastest Price from ISOBUTYLENE manufacturers

Zhuozhou Wenxi import and Export Co., Ltd
Product
ISOBUTYLENE 115-11-7
Price
US $15.00-10.00/KG
Min. Order
1KG
Purity
99%+ HPLC
Supply Ability
Monthly supply of 1 ton
Release date
2021-06-27
Shaanxi Dideu Medichem Co. Ltd
Product
2-Methylpropene 115-11-7
Price
US $1.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
20T
Release date
2020-01-10
career henan chemical co
Product
ISOBUTYLENE 115-11-7
Price
US $1.00/kg
Min. Order
1g
Purity
99%
Supply Ability
100KG
Release date
2018-12-21

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