ChemicalBook CAS DataBase List Maleic anhydride

Maleic anhydride synthesis

13synthesis methods

Product Name:Maleic anhydride
CAS Number:108-31-6
Molecular formula:C4H2O3
Molecular Weight:98.06

To a flask equipped with a Dean-Stark trap, condenser, and mechanical stirrer is added 116 gm (1.0 mole) of maleic acid and 120 ml of tetrachloroethane. The contents are heated, the water (18 ml, 1.0 mole) distilled off as the azeotrope, and the residue distilled under reduced pressure to afford 87.7 gm (89.5%) of the anhydride, b.p. 82-84°C (15 mm), m.p. 53°C. The residue remaining in the flask consists of about 10 gm of fumaric acid, m.p. 287°C.
Fumaric and maleic acids both give maleic anhydride on heating. Fumaric acid must first be heated to a higher temperature to effect its conversion to maleic acid prior to its dehydration.
Preparation of Maleic Anhydride

2-Furancarboxaldehyde, 5-[(formyloxy)methyl]-

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Yield:108-31-6 96.35%

Reaction Conditions:

with manganese(IV) oxide;dipotassium peroxodisulfate in water at 90; for 5 h;Catalytic behavior;Reagent/catalyst;Temperature;Solvent;

Steps:

1-22 Example 19:

0.50g 5-formyloxymethylfurfural (FMF), 0.88g of potassium persulfate, Manganese dioxide 0.03g, Copper nitrate 0.02g, 25mL of dichlorotoluene, 5mL of deionized water is added to the 50mL reactor, Heat to 90°C with magnetic stirring and react for 5h. The mixture in the reaction system was cooled to room temperature, and the yield of maleic anhydride (MA) was 96.35%.

References:

CN111187237,2020,A Location in patent:Paragraph 0017-0061

67-47-0 Synthesis