Methylethylene
Propylene
CAS: 115-07-1
Molecular Formula: C3H6
Methylethylene - Names and Identifiers
| Name | Propylene |
| Synonyms | PROPENE HC 1270 1-Propene Propylene PROPYLENE NCI-C50077 1-Propylene Methylethene Methylethylene PROPENE A10906 PROPYLENE CYL. WITH 2 L (NET ~800 G) |
| CAS | 115-07-1 |
| EINECS | 204-062-1 |
| InChI | InChI=1/C3H6/c1-3-2/h3H,1H2,2H3 |
Methylethylene - Physico-chemical Properties
| Molecular Formula | C3H6 |
| Molar Mass | 42.08 |
| Density | 1.49 |
| Melting Point | −185°C(lit.) |
| Boling Point | −47.7°C(lit.) |
| Flash Point | -108°C |
| Water Solubility | 0.33g/L(25 ºC) |
| Vapor Presure | 15.4 atm ( 37.7 °C) |
| Vapor Density | 1.48 (vs air) |
| Appearance | Colorless gas |
| Merck | 13,7941 |
| BRN | 1696878 |
| pKa | 43(at 25℃) |
| Stability | Stable. Highly flammable. Readily forms explosive mixtures with air. Incompatible with strong oxidizing agents, strong acids, halogens. |
| Explosive Limit | 11.1% |
| Refractive Index | 1.3567 |
| Physical and Chemical Properties | Properties: it is a colorless flammable gas at normal temperature and pressure. Slight odor characteristic of hydrocarbons. boiling point -47.4 ℃ freezing point -185.25 ℃ relative density 1.49 refractive index 1.3567 solubility soluble in ethanol and ether, slightly soluble in water. |
| Use | Mainly used in the preparation of isopropyl alcohol, acetone, synthetic glycerin, synthetic resin, synthetic rubber, plastic and synthetic fiber |
Methylethylene - Risk and Safety
| Hazard Symbols | F+ - Highly flammable |
| Risk Codes | 12 - Extremely Flammable |
| Safety Description | S9 - Keep container in a well-ventilated place. S16 - Keep away from sources of ignition. S33 - Take precautionary measures against static discharges. |
| UN IDs | UN 1077 2.1 |
| WGK Germany | - |
| RTECS | UC6740000 |
| HS Code | 29012200 |
| Hazard Class | 2.1 |
Methylethylene - Upstream Downstream Industry
Methylethylene - Nature
Open Data Verified Data
at room temperature and atmospheric pressure, propylene is a colorless, flammable, non-toxic gas. The gas relative density (Air = 1) was 1.48 at 20 °c and 0.1 MPa. Boiling point -47.7 °c. Triple point -185.2 °c. Gas density 1.7855kg/m3 (20 °c, 0.1 MPa). The liquid density was 513/m3 at 20 °c and saturation pressure. The critical temperature is 91.8, the critical pressure is 4600kPa, and the critical density is 233kg/m3. Latent heat of fusion 71. 354kJ/kg. Gas specific heat capacity at 15.6 ° C. And 0.1 MPa: Cp 62.5j/(mol.K), CV 54.035 J/(mol.K) Cp/CV 1.154. The specific heat capacity of the liquid is 91. 555J/(mol- K) at 49.8 ℃ and saturation pressure, and the thermal conductivity of the gas is 0.01778W/(m.K) at 25 ℃ and 0.1 MPa. The thermal conductivity of the liquid at -40 °c is 0.13703W/(m.K). Solubility in water 22. 05 cm3/lOOmL water (20 °c, 0.1 MPa). The flammable limit in air is 2.0% ~ 11.1% (Volume), and the spontaneous combustion temperature is 460. It was shipped as liquefied compressed gas at 21.1 °c and its own vapor pressure 942kPa.
Last Update：2025-06-10 22:55:16
Methylethylene - Preparation Method
Open Data Verified Data
A high-purity propylene product was obtained from the adsorption phase by an adsorption-expansion desorption method. Industrial propylene as raw materials, after crude purification by molecular sieve adsorbent selective adsorption, selective adsorption of polar compounds and unsaturated hydrocarbons, components that are more difficult to adsorb than propylene are easily distilled off in the gas phase, and then high purity propylene products are obtained from the adsorption phase.
Last Update：2025-06-10 22:55:16
Methylethylene - Application
Open Data Verified Data
for environmental protection, medical science and basic research and other fields.
Last Update：2025-08-19 16:24:40
Methylethylene - Safety
Open Data Verified Data
propylene is a asphyxiating gas and is narcotic. Store in a cool and ventilated place, away from fire and heat sources. It cannot be stored with oxygen, chlorine, other oxidants or combustible gas cylinders.
Last Update：2025-06-10 22:55:16
Methylethylene - Reference Information
| olfactory threshold (Odor Threshold) | 13ppm |
| freezing point | -185.25 ℃ |
| LogP | 1.77 at 20℃ |
| (IARC) carcinogen classification | 3 (Vol. Sup 7,60) 1994 |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Important organic industrial raw material | Propylene is the second member of the same series of olefins. The structural formula CH2 = CHCH3 is an important organic industrial raw material second only to ethylene and benzene. It is generally separated from thermal cracking and catalytic cracking gases, and is also a by-product of light oil cracking to ethylene. The molecule contains unsaturated carbon-carbon double bonds, which can undergo addition reactions with hydrogen, halogen, hydrogen halide, etc., and can also undergo addition reactions. It is the raw material for the production of acrylonitrile, polypropylene, ethylene propylene rubber, propylene oxide, acetone and other synthetic resins, synthetic rubber, synthetic fibers and plastics. It has anesthetic and asphyxia acute poisoning effects. When mixed with oxygen, it is anesthetic, and when mixed with air, it is more suffocating than anesthetic. At a concentration of 30 ~ 40%, you lose consciousness in 20 seconds. Chronic poisoning is not clear to the human body. When mice were exposed to 35% concentrations for 20 times in 58 days, their liver showed slight fat infiltration. Air quality standard: the Soviet Union stipulates 1.5ppm (3.0mg/m3,24 hours average as long-term standard, 30 minutes as short-term standard), democratic Germany 1.0ppm (2.0mg/m3,24 hours average as long-term standard), 1.5ppm (3.0mg/m3,30 minutes average as short-term standard). |
| Physical properties | Propylene is also called methylethylene and Propene. It was first discovered by Reynolds in 1851. Colorless flammable gas with sweet taste. The melting point is -185.2 ℃, the boiling point is -47.4 ℃; the relative density in liquid state is 0.5193; easy to liquefy, the critical temperature is 92 ℃, and the critical pressure is 4.56MPa; it forms an explosive mixture with air, and the explosion limit is 2.0% ~ 11.0% (volume); insoluble in water, soluble in organic solvents. High concentration of propylene has anesthetic effect on people, and when the concentration is low, it has irritating effect on eyes and skin. Figure 1 is the molecular structure of propylene. |
| propylene poisoning | [poisoning mechanism] (1) acute toxicity: propylene has stronger anesthetic effect and toxicity to cardiovascular system than ethylene. When inhaled 40% ~ 50%, mice, rats, cats and dogs were anesthetized, which is characterized by rapid occurrence and disappearance of anesthesia. When the concentration is 20% ~ 50%, both cats and dogs can cause ventricular premature beats and tachycardia. When cats inhale a mixture of 65% propylene and 35% oxygen, blood pressure can drop. When inhaling 70% ~ 80% concentration, cats and dogs can die quickly due to blood pressure drop, heart failure and respiratory arrest. (2) chronic toxicity: mice caused only slight fatty infiltration of liver after repeated anesthesia with 35% propylene for 20 times within 58d. [Poisoning manifestations] Propylene inhalation from the respiratory tract can cause irregular heartbeat. Inhalation of high concentration can cause strong anesthesia, but it disappears quickly. When the concentration of inhaled propylene is 15%, consciousness is lost after 30min. When the concentration reaches 35 ~ 40%, consciousness loss occurs after 20min. When inhaling more than 40%, nausea, vomiting and loss of consciousness will be caused for 6 seconds. 50% mixing propylene and oxygen can cause anesthesia. Long-term exposure to low concentrations of propylene, the central nervous system and gastrointestinal symptoms. Chronic effects are similar to those of ethylene. the olfactory threshold of propylene is 17.3mg/m3, and the eyes are slightly sensitive at nearly 1mg/m3. The chronic effects of propylene are similar to those of ethylene. [first aid] after poisoning, you must immediately evacuate the scene to fresh air or artificial respiration or oxygen inhalation. If propylene is splashed into eyes, rinse them with clear water for more than 15min immediately, and use 1% cocaine or 2% procaine to relieve pain. Ventricular premature beats can take drugs such as Xinning or propranolol, and adrenaline is prohibited. [protective measures] in order to prevent escape poisoning, the equipment pipeline must be tight, the operation site must be ventilated, and rubber gloves and protective masks must be worn during operation. |
| use | mainly used to make isopropanol, acetone, synthetic glycerin, synthetic resin, synthetic rubber, plastic and synthetic fiber, etc. used as raw material for polypropylene propylene is an important chemical raw material. Acrolein obtained by the gas phase oxidation of propylene is used to produce acrylic acid, allyl alcohol, glyceraldehyde, hydroxyacetaldehyde and important food and feed additive methionine; acrylonitrile obtained by the ammoxidation of propylene is synthetic fiber, synthetic rubber and plastic Important raw materials; chloropropene obtained by propylene chlorination can further synthesize allyl alcohol, propylene dichloropropanol, chloropropanitrile, etc., used for raw glycerin, epoxy resin, chlorohydrin rubber, surface activator, etc; propylene is alkylated to obtain cumene, which is currently the main intermediate of phenol. It is co-producing acetone while producing phenol; propylene is synthesized by carbonyl to obtain n-butyraldehyde and isobutyraldehyde, which can derive many organic synthesis intermediates for plasticizers, dyes, solvents, pesticides, etc.; propylene is hydrated to obtain isopropanol, which is used to produce acetone, acetone, isopropylamine and isopropyl ester; propylene dimerization to obtain ethylene, trimerization to obtain kilene, polymerization to obtain polypropylene, dodecene obtained by propylene tetramerization is an intermediate of surfactant. |
| production method | 1. refinery catalytic cracking gas is distilled to remove C2 and C4 fractions to obtain propylene and propane fractions, and then distilled to obtain propylene. 2. The product of high temperature cracking of petroleum hydrocarbons is a co-product of ethylene production. 3. Dehydrogenation of propane. The catalyst is chromium oxide-alumina, the reaction temperature is 635 ℃, the propane conversion rate is 54%, the propylene selectivity is 76%, and the recovery rate is 93% (molecular ratio). |
| category | harmful gases |
| toxicity classification | low toxicity |
| acute toxicity | inhalation-rat TCL0: 5000 PPM/ 6 hours/2 years |
| explosive hazard characteristics | open flame mixed with air, explosive when heated |
| flammability hazard characteristics | open flame, heated and combustible; combustion produces stimulating smoke |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; light loading and light unloading; separate from combustion-supporting gas cylinders such as oxygen and air |
| fire extinguishing agent | mist water, carbon dioxide, foam |
| occupational standard | TWA 17500 mg/m3 |
| auto-ignition temperature | 860 °F |
| DOT Classification | 2.1 (Flammable gas) |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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Raw Materials for Methylethylene
Downstream Products for Methylethylene