Classified Separation of Flash Pyrolysis Oil
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Classified Separation of Flash Pyrolysis Oil Xianwei Zheng & Yan Fu & Jie Chang & Shengyou Liang
# Springer Science+Business Media New York 2013
Abstract This paper focuses on the classified separation of flash pyrolysis oil by united extraction and distillation. Flash pyrolysis oil was effectively separated into four types of substances, including water-soluble fraction (low-boiling organic acids, alcohols, ketones, etc.), crude saccharide (mainly levoglucosan), phenolic compounds (guaiacol, 2-methoxy-4-methylphenol, etc.), and residue. The separation process was discussed in detail. The optimal separation condition was temperature 50 °C, 1:1 of water-to-oil ratio, and 20 min of contacting time. At this optimal separation condition, external standard method was employed to quantify levoglucosan, 4.1 wt% of levoglucosan accounted for the bio-oil could be obtained. Moreover, the potential applications of these four types of separated substances were discussed and proposed. Considering it is a kind of simple and effective process for the bio-oil, as well as the promising application prospects of the classified separation substances, this separation method will bring a new and highly efficient application of the bio-oil. Keywords Bio-oil . Classify . Separation . Saccharide . Phenolics
This study was presented at the International Conference on BiomassEnergy Technologies 2012 (ICBT 2012). X. Zheng : Y. Fu (*) : J. Chang : S. Liang The Key Lab of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China e-mail: [email protected]
Introduction With the decline of petroleum reserves and increase of energy demand, as well as growing environmental concerns regarding fossil fuel, it is imperative to develop renewable, environmentally friendly, and economical fuel and chemicals [1–3]. Biomass is expected to be the most cost-effective source of great practical value to produce renewable liquid fuel [4]. At the same time, flash pyrolysis technology has been the most effective, energetically independent, and commercially available method for biomass conversion to liquid fuel [5]. The resulting product pyrolysis oil has more potential to be used as a fossil resource substitute because the yields can be as high as 70 % based on the dry biomass weight [4]. Moreover, the nominal capacity of 50 t/day has been achieved, and the required high temperature can be kept by the exothermic pyrolysis reaction [4]. However, there have been more than 400 compounds identified in bio-oil obtained from biomass fast pyrolysis. And the usage of bio-oil is limited due to its drawbacks, including high acidity, low heating value, high corrosiveness, high viscosity, and poor stability, etc. [6, 7]. So, many researches have been carried out to improve the quality of bio-oil. But researchers always focused on recovering products from the whole bio-oil or from the major, relatively easily separated fractions [5]. In recent
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