A kind of method for producing valeric acid by hydrogenation of bio-based platform compound levulinic acid
A technology of levulinic acid and compounds, which is applied in the production process of valeric acid and the field of hydrogenation to produce valeric acid, can solve the problems of retention, no industrialization reports, and research on the process design of bio-based levulinic acid catalytic hydrogenation to valeric acid, etc. Problems, to meet the needs of industrialization, the effect of strong practicability
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[0025] Further, the preparation method of the mesoporous niobium phosphate catalyst comprises: soaking and stirring the mixed system containing supported metal ions such as cobalt, copper, nickel and mesoporous niobium phosphate at 25-100° C. Calcining at 750°C for 2-6 hours, and then reducing at 300-500°C for 2-6 hours, so that the loaded metal ions are loaded on the mesoporous niobium phosphate at a loading amount of 1%-20% (calculated by the mass of the metal).
[0026] In some embodiments, the method includes: first heating the aqueous solution of levulinic acid to 200-350° C., and then contacting it with hydrogen at a pressure of 1-5 MPa.
[0027] Further, the method may include: heating the levulinic acid aqueous solution to 200-350° C. through a heat exchanger, and the heating of the levulinic acid aqueous solution may also be coupled with the condensation of the product. The aqueous solution of levulinic acid is directly heated to 200-350°C through a gas-liquid heat ex...
Embodiment 1
[0038] Example 1 see figure 1 As shown, this embodiment is a specific implementation example of a process system for producing valeric acid by catalytic hydrogenation of bio-based platform compound levulinic acid.
[0039] Specifically, the process can include:
[0040] (1) Pass the levulinic acid aqueous solution with a mass fraction of 60% through the heat exchanger 1 to make the temperature reach 250°C.
[0041] (2) The hydrogen is heated to 250° C. through the heat exchanger 2 and mixed with levulinic acid-water.
[0042](3) The heated mixture enters the gas-solid phase catalytic reactor 5 for catalytic reaction and hydrogenation to obtain a reaction product. Gas-solid phase catalytic reactor 5 adopts an isothermal tubular fixed-bed reactor with a tube diameter of 30 mm and a length of 3000 mm. The heating medium is molten salt. The catalyst is cobalt / mesoporous niobium phosphate, and the bulk density of the catalyst is 1.0 g / ml, the catalytic reaction temperature is 2...
Embodiment 2
[0047] (1) Pass the levulinic acid aqueous solution with a mass fraction of 50% through the heat exchanger 1 to make the temperature reach 250°C.
[0048] (2) The hydrogen is heated to 250° C. through the heat exchanger 2 and mixed with levulinic acid-water.
[0049] (3) The heated mixture enters the gas-solid phase catalytic reactor 5 for catalytic reaction and hydrogenation to obtain a reaction product. Gas-solid phase catalytic reactor 5 adopts an isothermal tubular fixed-bed reactor with a tube diameter of 30 mm and a length of 3000 mm. The heating medium is molten salt. The catalyst is cobalt / mesoporous niobium phosphate, and the bulk density of the catalyst is 1.0 g / ml, the catalytic reaction temperature is 240°C, and the mass space velocity of the raw material is 3.0h -1 , the reaction pressure is 4MPa. Preparation method of cobalt / mesoporous niobium phosphate catalyst: Dissolve 5g of cobalt nitrate in 20ml of water, mix with 10g of mesoporous niobium phosphate, stir...
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