纤维素快速热裂解机理试验研究 Ⅰ. 试验研究
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摘要: 在热辐射反应器上对纤维素快速热裂解过程中主要一次产物的生成规律进行了研究。结合焦油的GC-MS分析，发现左旋葡聚糖（LG）作为最重要的液体产物，占据了焦油质量的45w%～85w%。LG的生成主要集中在550 ℃～650 ℃中温辐射源区域，其产量随温度的变化存在一最佳值，约在640 ℃左右得到54.4w%的最高产率。乙醇醛(HAA)作为焦油的第二重要组分，在焦油中达到了6w%～14w%的比例，与之含量接近的还有1-羟基-2-丙酮(Acetol)，约为3.5w%～8w%。它们的产率在相当大的范围内随温度的升高而增加，表明高温有利于它们的生成。同时分析表明乙醇醛、1-羟基-2-丙酮是在与LG的竞争过程中作为纤维素热裂解一次产物直接生成的。Abstract: The primary products formation during cellulose pyrolysis was studied using a heat radiation reactor. Combined with GC-MS analysis, Levoglucosan (LG) appeared to be the most important component, and its proportion in bio-oil was about 45w%～85w%. LG was mainly formed at 550 ℃～650 ℃ for the medial temperature of thermal radiation source (TRS). There existed an optimum TRS temperature about 640 ℃ for LG production. Glycolaldehyde and acetol were also the major components, which took up about 6w%～14w% and 3.5w%～8w% in bio-oil separately. However, their production always increased with TRS temperature within a rather wide range, showing that high reaction temperature benefited their formation. Furthermore, glycolaldehyde and acetol were formed in primary reaction competing against LG formation during cellulose pyrolysis, rather than formed from secondary cracking of LG.
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Key words:
- cellulose /
- rapid pyrolysis /
- levoglucosan /
- reaction mechanism
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