Propylene oxide
CAS Number: 75-56-9
Chemical Formula: C3H6O
Synonyms:
PROPYLENOXIDE
PROPYLENEOXIDE, REAGENT
Appearance: Colorless liquid
HS Code: 2910 20 00
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Propylene oxide, also called 1,2-propylene oxide or methyl ethylene oxide (abbreviated as PO), is a colorless, flammable, volatile liquid with an ether‑like odor. It has a molecular weight of 58.08, relative density 0.823 at 25°C, melting point −112.13°C, boiling point 34.23°C, and refractive index 1.3664. Its closed‑cup flash point is −35°C, autoignition temperature 420°C. Vapor pressures are 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. It dissolves in water (40.5 g/100 mL at 20°C, 60 g/100 mL at 30°C) and mixes freely with most common solvents. It forms a 1% water binary azeotrope at 39.9°C, and can also form azeotropes with dichloromethane, diethyl ether, cyclohexane, cyclopentane, pentene, and other organics.
Parameters
| Parameter | Value |
| 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 | 14,7856 |
| 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 | 0.030 |
| 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
| Item | Details |
| 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 of Propylene oxide CAS#75-56-9
As a key petrochemical feedstock, propylene oxide is widely used in manufacturing polyether polyols, propylene glycol, surfactants, blowing agents, demulsifiers, mineral processing agents, and related derivatives.
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