2,2,5-TRIMETHYLHEXANE Chemical Properties

Melting point:

-105.76°C

Boiling point:

122°C

Density 

0,71 g/cm³

vapor pressure 

3.647 at 0.000 °C, 5.072 at 5.000 °C, 6.958 at 10.000 °C, 9.418 at 15.000 °C, 12.583 at 20.000 °C,16.625 at 25.000 °C, 21.719 at 30.000 °C (inclined-piston, Osborn and Douslin, 1974)

refractive index 

1.3990 to 1.4010

Flash point:

13°C

solubility 

In methanol, g/L: 162 at 5 °C, 179 at 10 °C, 200 at 15 °C, 221 at 20 °C, 247 at 25 °C, 280 at 30 °C, 316 at 35 °C, 360 at 40 °C (Kiser et al., 1961); miscible with hexane and pentane.

form 

clear liquid

pka

>14 (Schwarzenbach et al., 1993)

color 

Colorless to Almost colorless

Odor Threshold

0.9ppm

Water Solubility 

1.15mg/L(25 ºC)

Henry's Law Constant

3.45 at 25 °C (Mackay and Shiu, 1981)

Exposure limits

ACGIH TLV: TWA for all isomers 200 ppm (adopted).

CAS DataBase Reference

3522-94-9(CAS DataBase Reference)

EPA Substance Registry System

Hexane, 2,2,5-trimethyl- (3522-94-9)

Safety Information

Risk Statements 

11

Safety Statements 

16-26

RIDADR 

3295

RTECS 

MO4630000

HS Code 

2901.29.1050

HazardClass 

3

PackingGroup 

III

2,2,5-TRIMETHYLHEXANE Usage And Synthesis

Chemical Properties

Colorless liquid.

Physical properties

Clear, colorless, flammable liquid with a faint aliphatic hydrocarbon odor. An odor threshold concentration of 900 ppb_v was reported by Nagata and Takeuchi (1990).

Uses

Synthesis, motor-fuel additive.

Hazard

Flammable, dangerous fire risk; the 2,3,3-, 2,3,4-, and 3,3,4-isomers are less flammable.

Environmental Fate

Chemical/Physical. Complete combustion in air produces carbon dioxide and water vapor. 2,2,5-Trimethylhexane will not hydrolyze because it does not contain a hydrolyzable functional group.

Solubility in water

In methanol, g/L: 162 at 5 °C, 179 at 10 °C, 200 at 15 °C, 221 at 20 °C, 247 at 25 °C, 280 at 30 °C, 316 at 35 °C, 360 at 40 °C (Kiser et al., 1961); miscible with hexane and pentane.

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