纤维素航油缩合-加氢工艺能耗分析

Energy consumption of condensation-hydrogenation process to prepare alkanes from lignocellulose biomass

随着纤维素原料制备糠醛、5-羟甲基糠醛、乙酰丙酸平台化合物技术的日益成熟,平台化合物再利用技术成为国际热点。通过研究平台化合物自缩合与交叉缩合工艺特点,以及后续加氢制备合成航油烷烃的可行路径,设计了利用2条纤维素生物质平台化合物全组分制备航油的工艺,通过能耗分析与评价,确定了每条工艺路线中的主要能耗单元及主要输入的耗能物质。结果表明:糠醛-乙酰丙酸交叉缩合加氢工艺相比糠醛自缩合加氢工艺、5-羟甲基糠醛自缩合加氢工艺在热耗、氢耗等方面有明显优势。为实现秸秆的全组分利用,提出糠醛-乙酰丙酸交叉缩合加氢联合5-羟甲基糠醛自缩合加氢工艺,根据目前的工艺技术,航油收率可达19.6%。

With the increasing maturity of technology for preparing furfural, 5-hydroxymethylfurfural, levulinic acid from lignocellulose biomass, platform compounds reuse technology has become an international hot spot. By studying the characteristics of the self-condensation and cross-condensation processes of platform compounds, as well as the feasible paths for subsequent hydrogenation to prepare synthetic jet fuel alkanes, two processes for preparing jet fuel with the full component use of lignocellulose biomass derived platform compounds were designed. Through energy consumption analysis and evaluation, the main energy consumption units and main input energy consumption materials in each process route were determined. Furfural-levulinic acid cross-condensation hydrogenation process compared with furfural self-condensation hydrogenation process and 5-hydroxymethyl furfural self-condensation hydrogenation process has obvious advantages in terms of heat consumption and hydrogen consumption. In order to realize the full-component utilization of straw, furfural-levulinic acid cross-condensation hydrogenation is combined with 5-hydroxymethylfurfural self-condensation hydrogenation process, and according to the current process technology, the jet fuel yield can reach 19.6%.