Clauser Nicolás M, Felissia Fernando E, Area María C, Vallejos María E
IMAM, UNaM, CONICET, FCEQYN, Programa de Celulosa y Papel (PROCyP), Félix de Azara 1552, Posadas 3300, Argentina.
Polymers (Basel). 2023 Jan 5;15(2):274. doi: 10.3390/polym15020274.
Agroforestry wastes are industrial byproducts available locally such as eucalyptus sawdust (EUC) and sugarcane bagasse (SCB). These byproducts can be used as lignocellulosic raw materials to produce high-value products. This study is a techno-economic analysis of four potential scenarios to produce polyhydroxybutyrate (PHB) and levulinic acid (LA) from hemicellulosic sugars by a fermentative pathway in a biomass waste biorefinery. Mass and energy balances were developed, and technical and economic assessments were carried out to obtain gas, char, and tar from residual solids from autohydrolysis treatment. It was determined that microbial culture could be an attractive option for added-value product production. More than 1500 t/year of PHB and 2600 t/year of LA could be obtained by the proposed pathways. Microbial and enzymatic conversion of LA from sugars could significantly improve energy consumption on the conversion strategy. The products from solid residual valorization (char and tar) are the most important for economic performance. Finally, a variation in specific variables could mean substantial improvements in the final indicators of the processes, reaching a higher NPV than USD 17 million.
农林业废弃物是当地可得的工业副产品，如桉木锯末（EUC）和甘蔗渣（SCB）。这些副产品可用作木质纤维素原料来生产高价值产品。本研究是对生物质废弃物生物精炼厂中通过发酵途径从半纤维素糖生产聚羟基丁酸酯（PHB）和乙酰丙酸（LA）的四种潜在方案进行的技术经济分析。建立了质量和能量平衡，并进行了技术和经济评估，以从自水解处理后的残余固体中获得气体、炭和焦油。结果表明，微生物培养可能是生产增值产品的一个有吸引力的选择。通过所提出的途径每年可获得超过1500吨的PHB和2600吨的LA。糖经微生物和酶转化为LA可显著改善转化策略中的能源消耗。固体残余物（炭和焦油）的增值产物对经济性能最为重要。最后，特定变量的变化可能意味着工艺最终指标的大幅改善，净现值超过1700万美元。
