2,2-Dimethylbutane
- CAS No.
- 75-83-2
- Chemical Name:
- 2,2-Dimethylbutane
- Synonyms
- NEOHEXANE;Trimethylpropane;neobutan;NEOBUTANE;(CH3)3CCH2CH3;2.2-DiMethylbu;tert-Butylethane;2-Ethylisobutane;2,2-dimethyl-butan;3,3-DIMETHYLBUTANE
- CBNumber:
- CB7280708
- Molecular Formula:
- C6H14
- Molecular Weight:
- 86.18
- MOL File:
- 75-83-2.mol
- Modify Date:
- 2023/12/25 13:23:17
| Melting point | −100 °C(lit.) |
|---|---|
| Boiling point | 50 °C(lit.) |
| Density | 0.649 g/mL at 25 °C(lit.) |
| vapor density | 2.97 (vs air) |
| vapor pressure | 5.35 psi ( 20 °C) |
| refractive index |
n |
| Flash point | <−30 °F |
| storage temp. | Flammables area |
| solubility | In methanol: 590 and 800 g/L at 5 and 10 °C, respectively. Miscible at higher temperatures (Kiser et al., 1961). Miscible with other aliphatic hydrocarbons, e.g., pentane, hexane, heptane, etc. |
| form | Liquid |
| pka | >14 (Schwarzenbach et al., 1993) |
| color | Clear colorless to slightly yellow |
| explosive limit | ~7.7% |
| Odor Threshold | 20ppm |
| Water Solubility | insoluble |
| BRN | 1730736 |
| Henry's Law Constant | 1.69(atm?m3/mol) at 25 °C (Mackay and Shiu, 1981) |
| Exposure limits | ACGIH TLV: TWA and STEL for all isomers except n-hexane are 500 and 1,000 ppm, respectively (adopted). |
| Dielectric constant | 1.8700000000000001 |
| Stability | Stable, but may be moisture sensitive. Highly flammable. Incompatible with strong oxidizing agents. |
| CAS DataBase Reference | 75-83-2(CAS DataBase Reference) |
| NIST Chemistry Reference | Butane, 2,2-dimethyl-(75-83-2) |
| EPA Substance Registry System | 2,2-Dimethylbutane (75-83-2) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |     GHS02,GHS07,GHS08,GHS09 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H225-H304-H315-H336-H411 | |||||||||
| Precautionary statements | P210-P233-P273-P301+P310-P303+P361+P353-P331 | |||||||||
| Hazard Codes | F,Xn,N | |||||||||
| Risk Statements | 11-38-51/53-65-67 | |||||||||
| Safety Statements | 9-16-29-33-61-62 | |||||||||
| RIDADR | UN 1208 3/PG 2 | |||||||||
| OEB | A | |||||||||
| OEL | TWA: 100.0 ppm; 350.0 mg/m3, STEL: 510.0 ppm; 1800.0 mg/m3 | |||||||||
| WGK Germany | 3 | |||||||||
| RTECS | EJ9300000 | |||||||||
| Autoignition Temperature | 797 °F | |||||||||
| HazardClass | 3 | |||||||||
| PackingGroup | II | |||||||||
| HS Code | 29011000 | |||||||||
| Toxicity | Reported as an impurity (0.2 wt %) in 99.0–99.7 wt % 2,3-dimethylbutane (Chevron Phillips, 2004). | |||||||||
| NFPA 704 |
|
2,2-Dimethylbutane price More Price(4)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich(India) | 39730 | 2,2-Dimethylbutane analytical standard | 75-83-2 | 5ML | ₹6647.93 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | 39730 | 2,2-Dimethylbutane analytical standard | 75-83-2 | 10ML | ₹12062.85 | 2022-06-14 | Buy |
| TCI Chemicals (India) | D0689 | 2,2-Dimethylbutane min. 98.0 % | 75-83-2 | 25ML | ₹6500 | 2022-05-26 | Buy |
| TCI Chemicals (India) | D0689 | 2,2-Dimethylbutane min. 98.0 % | 75-83-2 | 100ML | ₹17700 | 2022-05-26 | Buy |
2,2-Dimethylbutane Chemical Properties,Uses,Production
Chemical Properties
2,2-dimethylbutane is the chain isomeric form of hexane. It is a colorless and flammable liquid with a specific gravity of 0.6444. Insoluble in water, miscible with alcohol, ether, acetone, benzene and petroleum ether. The solubility is similar to that of hexane and 2-methylpentane.
Physical properties
Clear, colorless liquid with a mild petroleum-like odor. Liquid quickly evaporates and forms conbustible fumes. An odor threshold concentration of 20 ppmv was reported by Nagata and Takeuchi (1990).
Uses
2,2-Dimethylbutane is an acyclic alkane. Its Research Octane Number (RON) has been reported to be 91.8. It is used to Component of high-octane motor and aviation fuels, intermediate for agricultural chemicals.
Production Methods
2,2-Dimethylbutane is produced from crude oil, natural liquid gases, and petroleum refining processes.
Preparation
2,2-Dimethylbutane can be synthesised by the hydroisomerisation of 2,3-dimethylbutane using an acid catalyst.
By the thermal or catalytic union (alkylation) of ethylene and isobutane, both recovered from refinery gases.
General Description
Colorless liquid with an odor of gasoline. Less dense than water and insoluble in water. Hence floats on water. Irritating vapor. Flash point -54°F.
Air & Water Reactions
Highly flammable. Insoluble in water.
Reactivity Profile
2,2-Dimethylbutane may be incompatible with strong oxidizing agents like nitric acid. Charring may occur followed by ignition of unreacted material and other nearby combustibles. In other settings, mostly unreactive. Not affected by aqueous solutions of acids, alkalis, most oxidizing agents, and most reducing agents. When heated sufficiently or when ignited in the presence of air, oxygen or strong oxidizing agents, burns exothermically to produce carbon dioxide and water.
Hazard
Highly flammable, dangerous fire and explosion risk, explosion limits 1.2–7%
Health Hazard
Inhalation causes dizziness, nausea, and vomiting; concentrated vapor may cause unconsciousness and collapse. Contact with liquid causes irritation of eyes; repeated contact may produce irritation of skin. Ingestion causes irritation of stomach. Aspiration causes severe lung irritation, rapidly developing pulmonary edema, and central nervous system excitement followed by depression.
Safety Profile
Probably an irritant and narcotic in high concentration. A very dangerous fire and explosion hazard when exposed to heat or flame; can react vigorously with oxidzing materials. Keep away from heat or open flame. To fight fire, use foam, CO2, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes.
Environmental Fate
Photolytic. Reported photooxidation rate constants for the reaction of 2,2-dimethylbutane with
OH radicals at 297, 299, and 300 K are 2.59 x 10-12, 6.16 x 10-12, and 2.59 x 10-12
cm3/molecule?sec, respectively (Atkinson, 1985, 1990).
Chemical/Physical. Complete combustion in air yields carbon dioxide and water vapor. 2,2-
Dimethylbutane will not hydrolyze because it has no hydrolyzable functional group.
Purification Methods
Distil it azeotropically with MeOH, then wash it with water, dry (Na2SO4) it, and distil it. [Beilstein 1 IV 367.]
2,2-Dimethylbutane Preparation Products And Raw materials
| Supplier | Tel | Country | ProdList | Advantage | Inquiry |
|---|---|---|---|---|---|
| INOX Air Products Pvt. Ltd. | 91-22-41252348 | Maharashtra, India | 53 | 58 | Inquiry |
| TCI Chemicals (India) Pvt. Ltd. | 1800 425 7889 | New Delhi, India | 6778 | 58 | Inquiry |
| Henan Fengda Chemical Co., Ltd | +86-371-86557731 +86-13613820652 | China | 20361 | 58 | Inquiry |
| Shenzhen Nexconn Pharmatechs Ltd | +86-755-89396905 +86-15013857715 | China | 10259 | 58 | Inquiry |
| career henan chemical co | +86-0371-86658258 +8613203830695 | China | 29826 | 58 | Inquiry |
| Shaanxi Dideu Medichem Co. Ltd | +86-029-81138252 +86-18789408387 | China | 2316 | 58 | Inquiry |
| Hefei TNJ Chemical Industry Co.,Ltd. | 0551-65418671 | China | 34571 | 58 | Inquiry |
| Alfa Chemistry | United States | 2344 | 58 | Inquiry | |
| Aston Chemical | 13000000000 | United States | 1634 | 58 | Inquiry |
| Shaanxi Didu New Materials Co. Ltd | +86-89586680 +86-13289823923 | China | 9003 | 58 | Inquiry |