Product Description
Propylene oxide (PO), also known as 1,2-propylene oxide or methyl ethylene oxide, is a colorless, flammable, and volatile liquid with an ether-like odor. It has a molecular weight of 58.08 and a relative density of 0.823 (25°C). Key physical properties include a melting point of -112.13°C, a boiling point of 34.23°C, a refractive index of 1.3664, a flash point of -35°C (closed cup), and an ignition temperature of 420°C.
It exhibits vapor pressures of 1.04×10⁴ Pa at -20°C, 2.80×10⁴ Pa at 0°C, 6.53×10⁴ Pa at 20°C, and 7.59×10⁴ Pa at 25°C. Propylene oxide is soluble in water (40.5% at 20°C and 60% at 30°C) and is miscible with most common organic reagents. It forms a binary azeotrope with water (1%) with an azeotropic point of 39.9°C, and can also form azeotropes with dichloromethane, ether, cyclohexane, cyclopentane, pentene, and other solvents.
Properties
| Melting point | -112 °C |
| Boiling point | 34 °C(lit.) |
| density | 0.83 g/mL at 25 °C(lit.) |
| vapor density | 2 (vs air) |
| vapor pressure | 29.43 psi ( 55 °C) |
| refractive index | n20/D 1.366(lit.) |
| Fp | −35 °F |
| storage temp. | 2-8°C |
| solubility | 425-450g/l |
| form | Liquid |
| color | Clear |
| Odor | Ethereal; characteristic; sweet, alcoholyc; like natural gas. |
| explosive limit | 1.9-36%(V) |
| Water Solubility | 40 g/100 mL (20 ºC) |
| FreezingPoint | -112.13℃ |
| Merck | 147856 |
| BRN | 79763 |
| Henry's Law Constant | Not an environmentally important parameter because propylene oxide reacts rapidly with water |
| Exposure limits | TLV-TWA 50 mg/m3 (20 ppm) (ACGIH), 240 mg/m3 (100 ppm) (OSHA); IDLH 2000 ppm. |
| Stability: | Stable. Incompatible with acids, bases, oxidizing agents, copper, copper alloys, brass, bronze, iron, metal chlorides, peroxides and a wide variety of other materials. Reacts with compounds containing labile hydrogen. Extremely flammable - note low boiling point, low flash point and very wide explosion limits. Moisture sensitive. |
| LogP | 0.03 |
| CAS DataBase Reference | 75-56-9(CAS DataBase Reference) |
| NIST Chemistry Reference | Propylene oxide(75-56-9) |
| IARC | 2B (Vol. Sup 7, 60) 1994 |
| EPA Substance Registry System | Propylene oxide (75-56-9) |
Safety Information
| Hazard Codes | F+,T |
| Risk Statements | 45-46-12-20/21/22-36/37/38 |
| Safety Statements | 53-45 |
| RIDADR | UN 1280 3/PG 1 |
| WGK Germany | 3 |
| RTECS | TZ2975000 |
| Autoignition Temperature | 430 °C |
| TSCA | Yes |
| HS Code | 2910 20 00 |
| HazardClass | 3 |
| PackingGroup | I |
| Hazardous Substances Data | 75-56-9(Hazardous Substances Data) |
| Toxicity | LD50 orally in rats: 1.14 g/kg (Smyth) |
| IDLA | 400 ppm |
Product Application
Propylene oxide is an important petrochemical raw material widely used in the production of polyether polyols, propylene glycol, surfactants, foaming agents, demulsifiers, and mineral processing reagents, among other chemical products.
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