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摘要: 为了探究丙酮与乙酸乙酯对生物油储存特性的影响，将不同质量分数（3%、6%、9%、12%、15%）的丙酮和乙酸乙酯分别加入到生物油中，考察各组生物油理化特性随储存时间的变化。结果表明，添加丙酮和乙酸乙酯降低了生物油的含水率，且乙酸乙酯对生物油水分的降低效果优于丙酮。储存35 d后，15%乙酸乙酯组生物油的含水率为13.41%，比空白组（16.32%）降低了17.8%。加入添加剂后各组生物油的运动黏度均显著下降，与乙酸乙酯相比，丙酮对运动黏度影响较大。随着添加剂添加比例的增加，生物油运动黏度降低。储存35 d后，添加丙酮质量分数为3%、6%、9%、12%、15%的实验组生物油的运动黏度比空白组分别降低了37.20%、57.78%、71.92%、79.79%、84.67%。两种添加剂均能使生物油的pH值略微增大。红外光谱分析和气相色谱质谱联用分析显示，丙酮和乙酸乙酯抑制了生物油的老化反应。Abstract: Different ratios (3%, 6%, 9%, 12%, 15%) of acetone and ethyl acetate were added into crude bio-oil from fast pyrolysis to invest the effects of these two additives on the storage stability of bio-oil.The results show that both acetone and ethyl acetate can reduce the water content of bio-oil, and the ethyl acetate performes better than acetone.Compared to the blank control group, the water content decreases by 17.8%(from 16.32% to 13.41%) at 15% dose of ethyl acetate.The viscosities of bio-oil decrease a lot after adding acetone and ethyl acetate, and acetone shows more obvious effect.With the increasing of additive dose, the viscosity of bio-oil decreases.The viscosity of bio-oil decreases more than that of the control group by 37.20%, 57.78%, 71.92%, 79.79%, 84.67% with 3%, 6%, 9%, 12%, 15% dose of acetone, respectively.There is no significant difference in pH values among acetone and ethyl acetate addition groups and control group.According to the FT-IR and GC-MS analysis, it indicates that acetone and ethyl acetate inhibit the aging reactions of bio-oil during storage.
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Key words:
- pyrolysis /
- bio-oil /
- acetone /
- ethyl acetate /
- stability
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图 1 添加不同质量分数丙酮与乙酸乙酯的生物油运动黏度变化
Figure 1 Changes of bio-oil kinematic viscosity with addition of different doses of acetone
(a) and ethyl acetate(b) during storage
—■—: 0; —●—: 3%; —▲—: 6%; —▼—: 9%; —◆—: 12%; : 15%
图 2 添加不同质量分数丙酮与乙酸乙酯的生物油储存35 d后的红外光谱谱图
Figure 2 FT-IR spectrum of bio-oil with addition of different doses of acetone (a) and ethyl acetate (b)after 35 d storage
B·0 d: blank 0 d; B·35 d: blank 35 d
图 3 添加不同质量分数丙酮与乙酸乙酯的生物油储存35 d后主要组分的变化
Figure 3 Main compositon variation of bio-oil with addition of different doses of acetone (a) and ethyl acetate (b) after 35 d storage
: B·0 d; : B·35 d; : 3%; : 6%; : 9%;: 12%; : 15%
B·0 d: blank 0 d; B·35 d: blank 35 d表 1 添加不同质量分数的丙酮和乙酸乙酯生物油的含水率随储存时间的变化
Table 1 Changes of bio-oil water content with addition of different doses of acetone and ethyl acetate during storage
Time t/d Water content w/% B 3%A 3%E 6%A 6%E 9%A 9%E 12%A 12%E 15%A 15%E 0 15.65 15.18 15.18 14.71 14.71 14.24 14.24 13.77 13.77 13.30 13.30 7 16.39 15.61 14.27 15.08 13.96 14.35 14.40 14.39 14.22 13.16 14.59 14 16.51 16.72 15.55 15.67 15.00 13.99 14.20 14.56 14.45 13.78 13.93 21 16.67 16.01 14.48 15.44 14.06 14.59 14.25 13.04 14.45 13.76 12.93 28 15.71 15.49 14.95 15.72 14.62 14.30 14.36 13.88 13.85 13.76 12.91 35 16.32 15.43 14.74 15.00 14.53 14.78 14.16 14.34 13.85 14.36 13.41 B: blank；A: acetone；E: ethyl acetate 
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表 2 添加不同质量分数丙酮和乙酸乙酯的生物油pH值随储存时间的变化
Table 2 Changes of bio-oil pH values with addition of different doses of acetone and ethyl acetate during storage
Time t/d pH value B 3%A 3%E 6%A 6%E 9%A 9%E 12%A 12%E 15%A 15%E 0 1.98 2.07 1.99 2.10 2.14 2.17 2.19 2.26 2.22 2.29 2.26 7 1.87 1.89 1.88 2.00 1.92 2.12 1.96 2.16 1.99 2.21 1.98 14 1.76 1.85 1.82 1.97 2.13 2.06 2.01 2.14 2.13 2.29 2.18 21 1.78 1.89 1.84 1.92 2.01 1.92 2.00 1.98 1.96 2.14 2.02 28 1.75 1.79 1.77 1.84 1.95 1.87 1.87 2.06 1.88 2.13 1.92 35 1.75 1.78 1.76 1.81 1.84 1.82 1.79 1.86 1.79 1.89 1.82 B: blank；A: acetone；E: ethyl acetate
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