ACENAPHTHALENE
Acenaphthylene
CAS: 208-96-8
Molecular Formula: C12H8
ACENAPHTHALENE - Names and Identifiers
| Name | Acenaphthylene |
| Synonyms | 4-05-00-02138 Acenaphthylene Acenaphthalene ACENAPHTHYLENE ACENAPHTHALENE Polyacenaphthylene Acenaphthylene Standard cyclopenta(de)naphthalene acenaphthylene,industrial Cyclopenta[de]naphthalene acenaphthylene, homopolymer acenaphthylene anion radical 1,2-dihydroacenaphthylene-1,2-diide |
| CAS | 208-96-8 |
| EINECS | 205-917-1 |
| InChI | InChI=1/C12H8/c1-3-9-4-2-6-11-8-7-10(5-1)12(9)11/h1-8H |
| InChIKey | HXGDTGSAIMULJN-UHFFFAOYSA-N |
ACENAPHTHALENE - Physico-chemical Properties
| Molecular Formula | C12H8 |
| Molar Mass | 152.19 |
| Density | 0.899g/mLat 25°C(lit.) |
| Melting Point | 78-82°C(lit.) |
| Boling Point | 280°C(lit.) |
| Flash Point | 122°C |
| Water Solubility | 3.93mg/L(25 ºC) |
| Solubility | Insoluble in water, slightly soluble in ethanol, soluble in hot ether, hot benzene, toluene, glacial acetic acid, chloroform and petroleum ether. |
| Vapor Presure | 6.68 at 25 °C (gas saturation-HPLC/UV spectrophotometry, Sonnefeld et al., 1983) |
| Appearance | Yellow film |
| Specific Gravity | 0.899 |
| Color | Yellow |
| BRN | 774092 |
| Storage Condition | room temp |
| Stability | Stable. Incompatible with oxidizing agents. |
| Refractive Index | 1.6360 (estimate) |
| MDL | MFCD00003806 |
| Physical and Chemical Properties | The character is white or slightly yellow, oblique-like crystal. melting point 95.5 ℃ boiling point 278 ℃ relative density 1.0242 refractive index 1.6048 solubility insoluble in water, slightly soluble in ethanol, soluble in hot ether, hot benzene, toluene, glacial acetic acid, chloroform and petroleum ether. |
| Use | Production of 1, 8-naphthalenedicarboxylic anhydride raw material, used for the preparation of dyes, can be prepared by dehydrogenation after the resin, can be made of plant growth hormone, insecticidal fungicides, etc |
ACENAPHTHALENE - Risk and Safety
| Risk Codes | R22 - Harmful if swallowed R36/37/38 - Irritating to eyes, respiratory system and skin. R67 - Vapors may cause drowsiness and dizziness R65 - Harmful: May cause lung damage if swallowed R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R38 - Irritating to the skin R11 - Highly Flammable R39/23/24/25 - R23/24/25 - Toxic by inhalation, in contact with skin and if swallowed. R20 - Harmful by inhalation |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S62 - If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S60 - This material and its container must be disposed of as hazardous waste. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37 - Wear suitable protective clothing and gloves. S16 - Keep away from sources of ignition. S7 - Keep container tightly closed. S37/39 - Wear suitable gloves and eye/face protection S33 - Take precautionary measures against static discharges. S25 - Avoid contact with eyes. S9 - Keep container in a well-ventilated place. |
| UN IDs | UN 1145 3/PG 2 |
| WGK Germany | 3 |
| RTECS | AB1254000 |
| TSCA | Yes |
| HS Code | 29029090 |
| Toxicity | LC50 (21-d) for Folsomia fimetaria 145 mg/kg (Sverdrup et al., 2002). |
ACENAPHTHALENE - Nature
Open Data Verified Data
white or yellowish Crystal, flammable. Melting point 95.5 °c. Boiling point 278 °c. The relative density was 1. 0242. Refractive index 6048. The heat of fusion was 247. 28J/g. The heat of evaporation was 134.31J/g. Insoluble in water, slightly soluble in ethanol, soluble in hot ether, hot benzene, toluene, glacial acetic acid, chloroform and petroleum ether.
Last Update：2025-06-10 22:55:16
ACENAPHTHALENE - Preparation Method
Open Data Verified Data
in high temperature tar containing about 1.2% ~ 1.8%. Using wash oil as raw material, it is obtained by distillation, cooling, crystallization and separation.
Last Update：2022-01-01 10:40:13
ACENAPHTHALENE - Introduction
Insoluble in water, soluble in ethanol, methanol, petroleum ether, propanol; ether, benzene, chloroform. Flammable. Can polymerize in strong acid. That is, photochemical dimerization is produced to obtain a heptacore ring. Under normal conditions, the reaction with maleic anhydride is very slow, and the adduct is given under irradiation. High temperature coal tar contains 1.2% ~ 1.8%.
Last Update：2022-10-16 17:14:53
ACENAPHTHALENE - Application
Open Data Verified Data
raw material of organic synthesis, nitrated to produce Nitro-quinine; Further oxidation can produce 1, 8-naphthalenedicarboxylic anhydride and chloraquinone, which can be used to synthesize dye, polyester resin and polyester fiber; can also be used for the preparation of fluorescent pigments, drugs, pesticides, etc. Dehydrogenation of pinene, can be produced in the resin.
Last Update：2025-08-19 16:24:40
ACENAPHTHALENE - Safety
Open Data Verified Data
- so far, no cases of harm to human health have been found. See 1-methylnaphthalene.
- This product is a Class II flammable solid, dangerous regulation number 72011, stored in a cool and ventilated warehouse, the temperature does not exceed 30 ℃, away from the heat source, fire, and oxidant, flammable materials stored separately.
- It is packed with an asphalt hemp bag or a plastic bag, and an asphalt paper bag. Plastic bags and paper bags, with a net weight of not more than 80kg. The package shall be marked with "flammable items. According to the provisions of flammable materials storage and transportation.
Last Update：2025-06-10 22:55:16
ACENAPHTHALENE - Reference Information
| Henry's Law Constant | 1.14 at 25 °C (gas stripping-UV spectrophotometry, Warner et al., 1987) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | acenaphthene is an organic synthetic raw material used for electrical insulation materials, ion exchange resins, dyes, etc. When the purity of commercial goods is 95%, the melting point is 88-91 ℃, and the relative density at the melting point is 0.899. The raw material for the production of 1, 8-naphthalene diformic anhydride is used to make dyes. It can be dehydrogenated to make acenaphthene resin, plant growth hormone, insecticidal and fungicide, etc. Used as organic synthesis raw material. Such as nitro acenaphthene, naphthalene diformic anhydride, quinone, etc. Synthetic dyes such as Shilin scarlet, fluorescent whitening agent, pesticide, antioxidant and plant growth hormone. |
| production method | obtained by catalytic dehydrogenation of acenaphthene through gas phase: industrial acenaphthene is put into a melting kettle and heated with indirect steam to melt all. Use compressed air to press the liquid acenaphthene into the spiral gasification mixer, heat and gasify with steam, directly mix the steam and acenaphthene vapor into the superheat furnace, superheat to 450±20 ℃, enter the dehydrogenation reactor, and then condense and dry to obtain crude acenaphthene. Dissolve crude acenaphthene with ethanol, remove carbonides and mechanical impurities, cool, crystallize, and dry to obtain the finished product. The catalysts used are zinc oxide (85%), calcium oxide (5%), potassium sulfate (5%), potassium chromate (3%) and potassium hydroxide (2%). |
| category | toxic substances |
| toxicity classification | poisoning |
| acute toxicity | abdominal cavity-rat LD50:1700 mg/kg |
| flammability hazard characteristics | flammability; heating decomposition releases stimulating smoke |
| storage and transportation characteristics | warehouse ventilation and low temperature drying |
| fire extinguishing agent | dry powder, foam, sand and water |
| 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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