Products Description of maleic-anhydride.html">Maleic anhydride CAS# 108-31-6
Maleic anhydride is the cyclic anhydride of maleic acid. It appears as a colorless or white solid at room temperature with a characteristic acidic taste, molecular formula C4H2O3 and molecular weight 98.06. It forms needle-like crystals when crystallized from chloroform or ether. Key properties include melting point 60℃, boiling point 82℃ at 1.8665 kPa, and relative density 1.3146 at 60℃. It is soluble in acetone, chloroform and ether, slightly soluble in petroleum ether. It hydrolyzes in water to form maleic acid and reacts with alcohols to produce esters. It readily undergoes Diels-Alder reactions with conjugated dienes. Maleic anhydride is toxic and strongly irritates mucous membranes.
Parameters
| Parameter | Value |
| Melting point | 51-56 °C (lit.) |
| Boiling point | 200 °C (lit.) |
| density | 1.48 |
| bulk density | 700-800kg/m3 |
| vapor density | 3.4 (vs air) |
| vapor pressure | 0.16 mm Hg ( 20 °C) |
| refractive index | 1.4688 (estimate) |
| Fp | 218 °F |
| storage temp. | Store below +30°C. |
| solubility | Chloroform (Slightly), Ethyl Acetate (Slightly) |
| pka | 0[at 20 ℃] |
| form | powder |
| color | White |
| PH | 0.8 (550g/l, H2O, 20℃)Hydrolysis |
| Odor | Mild acrid odor. |
| explosive limit | 1.4-7.1%(V) |
| Water Solubility | 79 g/100 mL (25 ºC) |
| Sensitive | Moisture Sensitive |
| Merck | 14,5704 |
| BRN | 106909 |
| Henry's Law Constant | (atm·m³/mol): Not applicable - reacts with water |
| Exposure limits | NIOSH REL: TWA 1 ppm (0.25 mg/m³ ), IDLH 10 ppm; OSHA PEL: TWA 0.25 ppm; ACGIH TLV: TWA 0.25 ppm with an intended change of 0.1 ppm. |
| Dielectric constant | 51.0（60℃） |
| Stability | Stable. Combustible. Incompatible with water, strong oxidizing agents, alkali metals, strong bases, amines, most common metals, polymerization catalysts and accelerators. |
| InChIKey | FPYJFEHAWHCUMM-UHFFFAOYSA-N |
| LogP | -2.61 at 20℃ |
| CAS DataBase Reference | 108-31-6(CAS DataBase Reference) |
| NIST Chemistry Reference | 2,5-Furandione(108-31-6) |
| EPA Substance Registry System | Maleic anhydride (108-31-6) |
Safety Information
| Item | Details |
| Hazard Codes | C |
| Risk Statements | 22-34-42/43 |
| Safety Statements | 22-26-36/37/39-45 |
| OEB | C |
| OEL | TWA: 1 mg/m3 (0.25 ppm) |
| RIDADR | UN 2215 8/PG 3 |
| WGK Germany | 1 |
| RTECS | ON3675000 |
| F | 21 |
| Autoignition Temperature | 870 °F |
| TSCA | Yes |
| HS Code | 2917 14 00 |
| HazardClass | 8 |
| PackingGroup | III |
| Hazardous Substances Data | 108-31-6(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: 1090 mg/kg LD50 dermal Rabbit 2620 mg/kg |
| IDLA | 10 mg/m3 |
Product Application of Maleic anhydride CAS# 108-31-6
Maleic anhydride serves as a key raw material for manufacturing 1,4-butanediol, γ-butyrolactone, tetrahydrofuran, succinic acid, unsaturated polyester resin, alkyd resin and related chemicals. It is also widely used in the production of pharmaceuticals and pesticide products.
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