Aqueous Extractive Upgrading of Bio-Oils Created by Tail-Gas Reactive Pyrolysis To Produce Pure Hydrocarbons and Phenols

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• 作者：Yaseen Elkasabi ; Charles A. Mullen ; Akwasi A. Boateng
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2015
• 出版时间：November 2, 2015
• 年：2015
• 卷：3
• 期：11
• 页码：2809-2816
• 全文大小：313K
• ISSN：2168-0485

文摘

Tail-gas reactive pyrolysis (TGRP) of biomass produces bio-oil that is lower in oxygen (鈭?5 wt % total) and significantly more hydrocarbon-rich than traditional bio-oils or even catalytic fast pyrolysis bio-oils. TGRP bio-oils lend themselves toward mild and inexpensive upgrading procedures. We isolated oxygen-free hydrocarbons by extraction of TGRP bio-oil distillates. Extraction proceeded by adding aqueous sodium hydroxide to distillates, resulting in a hydrocarbon layer and a phenolic salts layer. The hydrocarbons consist primarily of mono- and bicyclic aromatics, are essentially free of oxygen (<1.0 wt %), and possess low moisture (<1.0 wt %) and low acidity (TAN < 5.0 mg KOH/g). The phenolic salts can be reacidified to produce phenols with low moisture (鈭?.5 wt %) and with narrow product distribution. The aqueous phase byproduct contains organic acids and precipitated sodium chloride. The hydrocarbon layer can be upgraded via mild hydrogenation with a sponge nickel base metal catalyst in water, producing naphtha compounds appropriate for direct use as drop-in fuel and/or refinery blendstock. Furthermore, using only hydrogenation eliminates CO and CO₂ production that normally accompanies hydrodeoxygenation.