Products Description of Maleic anhydride CAS# 108-31-6
Cis-butenedioic anhydride, also known as "maleic anhydride", is the anhydride of cis-butenedioic acid (maleic acid). It is a colorless or white solid with a sour taste at room temperature, having a molecular formula of C₄H₂O₃ and a molecular weight of 98.06. Needle-shaped crystals can be obtained from chloroform or ether. Its melting point is 60℃, boiling point is 82℃ (at 1.8665 kPa), and relative density is 1.31460. It is easily soluble in acetone, chloroform and ether, and slightly soluble in petroleum ether. When dissolved in water, it forms cis-butenedioic acid; when dissolved in alcohol, it forms esters. It can undergo a diene synthesis reaction (Diels-Alder reaction) with compounds containing conjugated double bonds. It is toxic and has strong irritation to mucous membranes.
Parameters
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 | |
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
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
It serves as a raw material for the production of 1,4-butanediol, γ-butyrolactone, tetrahydrofuran, succinic acid, unsaturated polyester resin, alkyd resin and other products. Additionally, it finds application in the pharmaceutical and pesticide industries.
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