Abstract
The cooperative interaction of acid-washing pretreatment and condensation technology was used to explore the experiment of phenolic compounds enrichment by pyrolysis of cotton straw. The bio-oil was synthetically analyzed from functional group composition, pyrolysis properties and critical composition. The percentage of condensable fraction in pyrolytic organic vapors was remarkably improved after the acid-washing pretreatment. The condensation technology promoted the selective condensation of pyrolytic organic vapors, separated small molecules such as acetic acid and water, and facilitated the enrichment of phenolic substances. With the cooperative interaction of acid-washing pretreatment and condensation technology, the moisture in bio-oil was diminished by 55.81%, the content of acetic acid dropped from 14.15 wt% to 5.70 wt%, and the total detectable phenolic compounds rose from 1.41 wt% to 7.07 wt%. This investigation offered a facile and useful optimization scheme to concentrate high-value-added phenolic compounds by pyrolytic liquefaction of biomass.
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