| Customization: | Available |
|---|---|
| CAS No.: | 108-31-6 |
| Formula: | C4H2O3 |
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| Name | Maleic anhydride |
| Synonyms | MA 2,5-FURANDIONE 2,5-Furandione furan-2,5-dione MaleicAnhydride MALIEC ANHYDRIDE Maleic anhydride ANHYDRIDE MALEIC TOXILIC ANHYDRIDE Sodium n-amylxanthate cis-Butenedioic anhydride |
| CAS | 108-31-6 |
| EINECS | 203-571-6 |
| InChI | InChI=1S/C4H2O3/c5-3-1-2-4(6)7-3/h1-2H |
| InChIKey | FPYJFEHAWHCUMM-UHFFFAOYSA-N |
| Molecular Formula | C4H2O3 |
| Molar Mass | 98.06 |
| Density | 1.48 |
| Melting Point | 51-56 °C (lit.) |
| Boling Point | 200 °C (lit.) |
| Flash Point | 218°F |
| Water Solubility | 79 g/100 mL (25 ºC) |
| Vapor Presure | 0.16 mm Hg ( 20 °C) |
| Vapor Density | 3.4 (vs air) |
| Appearance | White powder |
| Color | White |
| Exposure Limit | NIOSH REL: TWA 1 ppm (0.25 mg/m3), IDLH 10 ppm; OSHA PEL: TWA0.25 ppm; ACGIH TLV: TWA 0.25 ppm with an intended change of 0.1 ppm. |
| Merck | 14,5704 |
| BRN | 106909 |
| pKa | 0[at 20 ºC] |
| PH | 0.8 (550g/l, H2O, 20ºC)Hydrolysis |
| Storage Condition | Store below +30°C. |
| Stability | Stable. Combustible. Incompatible with water, strong oxidizing agents, alkali metals, strong bases, amines, most common metals, polymerization catalysts and accelerators. |
| Sensitive | Moisture Sensitive |
| Explosive Limit | 1.4-7.1%(V) |
| Refractive Index | 1.4688 (estimate) |
| Physical and Chemical Properties |
character orthorhombic crystal system colorless needle-like or plate-like crystals. |
| Use | It is used as a raw material for the production of 1, 4-butanediol, γ-butyrolactone, Tetrahydrofuran, succinic acid, unsaturated polyester resin, alkyd resin, etc., and is also used for pharmaceuticals and pesticides |
| Hazard Symbols | C - Corrosive |
| Risk Codes | R22 - Harmful if swallowed R34 - Causes burns R42/43 - May cause sensitization by inhalation and skin contact. |
| Safety Description | S22 - Do not breathe dust. 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. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 2215 8/PG 3 |
| WGK Germany | 1 |
| RTECS | ON3675000 |
| FLUKA BRAND F CODES | 21 |
| TSCA | Yes |
| HS Code | 2917 14 00 |
| Hazard Class | 8 |
| Packing Group | III |
| Toxicity | LD50 orally in Rabbit: 1090 mg/kg LD50 dermal Rabbit 2620 mg/kg |
| Henry's Law Constant | (atm?m3/mol):Not applicable - reacts with water |
| LogP | -2.61 at 20ºC |
| introduction | maleic anhydride (MA), abbreviated as maleic anhydride, or maleic anhydride, is an acid anhydride of maleic acid, which is a colorless or white solid with sour taste at room temperature, and the molecular formula is C4H2O3. |
| Chemical reaction | The reactions that maleic anhydride can occur are: Hydrolysis to generate maleic acid (cis-HO2CCH = CHCO2H),1:1 alcoholysis to generate monoester: cis-HO2CCH = CHCO2CH3; Used as dienophile in Diels-Alder reaction; Coordination with low-priced metals, examples of complexes such as Pt(PPh3)2(MA) and Fe(CO)4(MA). When maleic anhydride performs photochemical dimer reaction, CBDA is formed. |
| Use | Used as a raw material for the production of 1, 4-butanediol, γ-butyrolactone, tetrahydrofuran, succinic acid, unsaturated polyester resin, alkyd resin, etc. It is also used in medicine and pesticides Maleic anhydride, also known as maleic anhydride, maleic anhydride, maleic anhydride, is an important basic raw material of unsaturated organic anhydride, in the production of pesticides, it is used to synthesize the intermediate diethyl maleate of the organophosphorus insecticide malathion, the intermediate 1-phenyl -3, 6-dihydroxypyridazine of pyridine, and pyrethroid The pyrethroid insecticide, amthran, fungicides, and intermediates of gram, in addition, it is also used to produce unsaturated polyester resins, ink additives, papermaking additives, coatings, pharmaceutical industry, food industry, etc. it is mainly used as raw materials for producing unsaturated polyester resin, alkyd resin, pesticide malathion, high-efficiency and low-toxicity pesticide 4049 and long-acting iodoamine. Also paint, maleic rosin, polymaleic anhydride, maleic anhydride-styrene copolymer. It is also an organic chemical raw material for the production of ink additives, papermaking additives, plasticizers and tartaric acid, fumaric acid, tetrahydrofuran, etc. Used for organic synthesis, and also used as a synthetic fiber intermediate As a collector in metal beneficiation |
| production method | the main production methods of maleic anhydride are benzene oxidation, butene oxidation and n-butane oxidation, but benzene oxidation is still the main method. 1. Benzene oxidation process Benzene undergoes oxidation reaction in a fixed bed under the action of a V-Mo-P-based catalyst to generate maleic anhydride. The reaction temperature is 365 ºC (the reaction bed can also be boiling bed, but the consumption is high). Then it is absorbed with water to generate maleic acid, and then after azeotropic dehydration and rectification, the finished product is obtained by scraping. 2. Butane (or butene) oxidation butane (or butene) is oxidized to maleic anhydride by air or oxygen under the action of V-Mo catalyst, and the reaction temperature is 350-400 ºC. Then it is absorbed by water, dehydrated and refined to obtain the finished product. The synthesis methods of maleic anhydride mainly include benzene oxidation, butene oxidation, butane oxidation, etc. At present, most of the production uses benzene oxidation, that is, benzene is used as raw material to obtain maleic anhydride through catalytic oxidation. A fixed bed or boiling bed reactor was used to convert phenoxy into maleic anhydride with air under the action of a V-Mo-P-based catalyst at a reaction temperature of 365 ºC. Then it is absorbed with water to generate maleic acid aqueous solution, and then xylene is dehydrated by azeotropic distillation to obtain maleic anhydride, and finally the finished product is rectified under reduced pressure. |
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