Method for modification of biomass pyrolytic oil lightweight components/water phase by using in-situ hydrogenation reaction
A biomass pyrolysis oil and light component technology, applied in the chemical field, can solve the problems of large use, high pressure, coking, etc., and achieve the effects of high added value, high overall yield and simplified process
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[0030] The preparation of Raney Ni catalyst of the present invention adopts NaOH solution to dissolve nickel-aluminum alloy powder method to make, and concrete steps are as follows:
[0031] Add 200g of NaOH solution with a mass fraction of 20% made of deionized water into a 500ml three-necked flask equipped with magnetic stirring, and then slowly add 30g of nickel-aluminum alloy powder into the above solution, keeping the solution temperature at 50±2°C , continue to stir for 1.5h, remove the supernatant after standing still, wash with distilled water until the pH value of the washing solution is 8-9, and then wash with absolute ethanol for 5-6 times to obtain the Raney Ni catalyst. The prepared catalyst is stored in in absolute ethanol for use.
[0032] The catalyst was washed several times with distilled water to remove residual ethanol on the catalyst before use.
[0033] After the reaction is completed, use a rotary evaporator to separate precipitation, fatty alcohol / acid...
Embodiment 1
[0037] Mix 3g of biomass pyrolysis oil light component / water phase, 6g of methanol, and 15g of water to obtain a reaction stock solution. The reaction stock solution was added to a 50ml high-pressure reactor, and 0.8g of Raney Ni catalyst washed with distilled water was added. After replacing the air in the kettle with nitrogen, the pressure in the kettle was raised to 4 MPa, the reactor was heated to 150° C., and reacted for 4 hours. After the reaction was completed and cooled to room temperature, the liquid and catalyst were collected. Get reaction system mixture and do gas chromatography (GC), the result is as follows figure 2 shown. From the qualitative and quantitative analysis of GC-MS results, the total yield of complex alcohols and complex esters in biomass pyrolysis oil is 27.58%.
[0038] In the above examples, the reaction can also be realized by using ethanol / glycerin / formic acid.
Embodiment 2
[0040] Mix 3g of biomass pyrolysis oil light component / water phase, 6g of methanol, and 15g of water to obtain a reaction stock solution. The reaction stock solution was added to a 50ml high-pressure reactor, and 0.8g of Raney Ni catalyst washed with distilled water was added. After replacing the air in the kettle with nitrogen, the pressure in the kettle was raised to 4 MPa, the reactor was heated to 260° C., and reacted for 4 hours. After the reaction was completed and cooled to room temperature, the liquid and catalyst were collected. Get reaction system mixture and do gas chromatography (GC), the result is as follows figure 2 shown. And from the qualitative and quantitative analysis of GC-MS results, the total yield of complex alcohols and complex esters in biomass pyrolysis oil is 36.41%.
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