A method for preparing furfural and levulinic acid by clean hydrolysis of biomass
A technology of levulinic acid and biomass, which is applied in the field of biomass resource utilization, can solve problems such as pollution, high consumption of inorganic acids, and equipment corrosion environment, and achieve the effects of improving catalytic efficiency, mild catalytic system, and improving conversion efficiency
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Embodiment 1
[0026] A method for preparing furfural and levulinic acid by clean hydrolysis of biomass, such as figure 1 shown, including the following steps:
[0027] 1) Raw material pretreatment
[0028] The biomass raw material corncobs are pulverized and ground to below 2 mm and then steam-exploded. The pressure of the steam-explosion is 2Mpa and the time is 5 minutes. The weight ratio of alkali and water is 1:0.5:20. After the reaction, the slurry is passed through a 40-mesh sieve, and the obtained filtrate is the pretreatment slurry. The solid residue obtained is washed, filtered, and dried to recover the solid alkali; the solid alkali used is a molecular sieve load CaO with a particle size of 20-30 mesh;
[0029] 2) Primary hydrolysis
[0030] Mix the pretreatment slurry and solid acid catalyst A in a primary hydrolysis reactor (fixed bed reactor) and react at 180°C for 60 minutes to obtain a primary hydrolysis reaction liquid; the solid acid catalyst A is a microporous molecular ...
Embodiment 2
[0035] A method for preparing furfural and levulinic acid by clean hydrolysis of biomass, such as figure 1 shown, including the following steps:
[0036] 1) Raw material pretreatment
[0037] The biomass raw material corn stalks are pulverized and ground to less than 2mm, and then steam-exploded. The pressure of the steam explosion is 2Mpa, and the time is 5min. The weight ratio of alkali and water is 1:0.5:20. After the reaction, the slurry is passed through a 40-mesh sieve, and the obtained filtrate is the pretreatment slurry. The solid residue obtained is washed, filtered, and dried to recover the solid alkali; the solid alkali used is a molecular sieve load MgO with a particle size of 20-30 mesh;
[0038] 2) Primary hydrolysis
[0039] Mix the pretreatment slurry and solid acid catalyst A in a primary hydrolysis reactor (fixed bed reactor) and react at 180°C for 60 minutes to obtain a primary hydrolysis reaction liquid; the solid acid catalyst A is a microporous molecul...
Embodiment 3
[0044] A method for preparing furfural and levulinic acid by clean hydrolysis of biomass. The difference from Example 1 is that in step 1), the pressure of steam explosion is 3Mpa, and the time is 1min. After steam explosion, solid alkali and water are added to mix , reacted at 160°C for 120min, and the weight ratio of the biomass raw material, solid base and water was 1:0.3:10; the solid base used was CaO loaded on molecular sieves, and its particle size was 20-30 mesh; the rest were the same as in Example 1, After analysis and calculation, the yield of furfural was 62.4%, and the yield of levulinic acid was 62.7% (the calculated yields are relative to the theoretical yield).
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