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With water;HUSY (Si/Al=15); at 250℃; under 5250.53 Torr; for 2h;Inert atmosphere;Product distribution / selectivity;
In an autoclave (batch reactor) lignin (0.5 g), HUSY (Si/Al=15) (0.5 g) and mixture of water and organic solvent (30 g) were charged. After flushing the reactor with nitrogen gas for 3 times, nitrogen (7 bar) was charged. Reactor was heated up to 230° C. under the stirring (100 rpm). After attaining the desired temperature of 230° C. stirring was increased up to 500 rpm. Reaction was stopped after 30 minutes. Analysis of reaction mixture was done by GC, GC-MS. The lignin used in these examples were organosolv or dealkaline.Yield: >25percentMass balance: >90percent.The effect of reaction temperature and reaction time on depolymerization reaction is demonstrated by the results presented in Table 8 using SiO2-Al2O3 as catalyst*. TABLE 8 Exp. Time Lignin Product yield, Mass balance, No. (min.) conversion percentpercentNo. percent 1. 30 85 26 80 2. 60 85 41 86 3. 90 92 50 84 4. 120 95 70 85 Lignin, 0.5 g; HUSY (Si/Al = 15), 0.5 g; N2 Pressure, 7 bar (at)RT; Temperature, 250° C.No.Monomer and dimer products soluble in water/organic solvents.
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