METHOD FOR PREPARING MALEATE BY SELECTIVE CATALYTIC OXIDATION OF LIGNIN
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Abstract
The invention discloses a method for preparing maleate by selective catalytic oxidation of lignin. The method uses a heteropolyacid functionalized ionic liquid as a catalyst, and an aqueous alcohol solution as a reaction medium to achieve high-efficiency selective catalytic conversion and ring opening oxidation of biomass lignin at a reaction temperature of 110-160° C. and an oxygen pressure of 0.5-1.0 MPa for 1-6 h. The selectivity of maleate is higher than 47.83%. The yield and selectivity of a single chemical derived from the depolymerization of lignin in the present invention are much higher than the prior art, and the ionic liquid catalyst exhibits outstanding advantages such as availability of recovery and recycling through simple temperature adjustment; the reaction conditions of the present invention are mild, and the process is green and safe, easy to operate, and available forbatch and continuous production. The invention provides a new green way for preparing bulk chemicals like maleate from reproducible raw materials such as lignin.
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Citations
23 Claims
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1-10. -10. (canceled)
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11. A method for preparing maleate by selective catalytic oxidation of lignin, comprising:
- adding lignin, a heteropolyacid functionalized ionic liquid, and an aqueous alcohol solution to a autoclave, and reacting at 110-160°
C. under 0.5-1.0 MPa oxygen atmosphere for 1-5 h;
after the reaction, centrifuging the reaction solution, conducting liquid-liquid separation to obtain maleate and the ionic liquid catalyst;
whereinThe heteropolyacid functionalized ionic liquid consists of a cation and an anion;
the cation includes a alkyl or alkanesulfonate imidazole cation or a pyridine, and the anion includes a phosphotungstate, a phosphomolybdate, a silicotungstate, and a silicomolybate. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- adding lignin, a heteropolyacid functionalized ionic liquid, and an aqueous alcohol solution to a autoclave, and reacting at 110-160°
Specification