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ISOBUTYLENE

ISOBUTYLENE
ISOBUTYLENE structure
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

ISOBUTYLENE Properties

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)
Indirect Additives used in Food Contact Substances
ISOBUTYLENE
FDA 21 CFR
175.105; 176.180
EWG's Food Scores
1
FDA UNII
QA2LMR467H
EPA Substance Registry System
Isobutene (115-11-7)
SAFETY
  • Risk and Safety Statements
Symbol(GHS) 
GHS02,GHS04
Signal word  Danger
Hazard statements  H220-H280
Precautionary statements  P210-P377-P381-P410+P403
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
Toxicity LC50 (inhalation) for mice 415 g/m3/2-h, rats 620 g/m3/4-h (quoted, RTECS, 1985).
NFPA 704
4
1 0

ISOBUTYLENE price More Price(19)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 295469 2-Methylpropene 99% 115-11-7 100g $199 2021-12-16 Buy
Sigma-Aldrich 295469 2-Methylpropene 99% 115-11-7 1kg $571 2021-12-16 Buy
TCI Chemical I0909 Isobutene (ca. 8% in Dichloromethane) 115-11-7 100mL $56 2021-12-16 Buy
TCI Chemical I0909 Isobutene (ca. 8% in Dichloromethane) 115-11-7 500mL $165 2021-12-16 Buy
Oakwood 102139 Isobutylene 115-11-7 25g $52 2021-12-16 Buy

ISOBUTYLENE Chemical Properties,Uses,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.]

ISOBUTYLENE Preparation Products And Raw materials

Raw materials

Preparation Products


ISOBUTYLENE Suppliers

Global( 126)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
career henan chemical co
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sales@coreychem.com China 29953 58
Hubei Jusheng Technology Co.,Ltd.
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Hubei xin bonus chemical co. LTD
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Chongqing Chemdad Co., Ltd
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HENAN BON INDUSTRIAL CO.,LTD
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CONIER CHEM AND PHARMA LIMITED
86-18523575427
sales@conier.com China 47498 58
Shaanxi Dideu Medichem Co. Ltd
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Zhengzhou Alfa Chemical Co.,Ltd
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sales5@alfachem.cn;sales9@alfachem.cn;sale1@alfachem.cn China 12858 58
SIMAGCHEM CORP
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Hefei TNJ Chemical Industry Co.,Ltd.
0551-65418671
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View Lastest Price from ISOBUTYLENE manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-07-02 ISOBUTYLENE
115-11-7
US $15.00-10.00 / KG 1KG 99%+ HPLC Monthly supply of 1 ton Zhuozhou Wenxi import and Export Co., Ltd
2020-01-13 2-Methylpropene
115-11-7
US $1.00 / KG 1KG 99% 20T Shaanxi Dideu Medichem Co. Ltd
2019-07-06 ISOBUTYLENE
115-11-7
US $1.00 / kg 1g 99% 100KG Career Henan Chemical Co

ISOBUTYLENE Spectrum


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