Liquid Hot Water and Steam Explosion Pretreatment Methods for Cellulosic Raw Materials: A Review

被引:0
作者
Gladysheva, Evgenia K. [1 ]
机构
[1] Russian Acad Sci IPCET SB RAS, Inst Problems Chem & Energet Technol, Bioconvers Lab, Siberian Branch, Biisk 659322, Russia
关键词
liquid hot water; steam explosion; cellulosic raw materials; pretreatment methods; LIFE-CYCLE ASSESSMENT; ENZYMATIC-HYDROLYSIS; SUGARCANE BAGASSE; LIGNOCELLULOSIC BIOMASS; AFEX PRETREATMENT; PARTICLE-SIZE; CORN STOVER; BIOETHANOL PRODUCTION; SUPERCRITICAL CO2; BIOGAS PRODUCTION;
D O I
10.3390/polym17131783
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Cellulosic raw materials are the most common source of carbon on Earth and are in great demand for the production of high-value-added products. Cellulosic feedstocks represent a strong matrix consisting of cellulose, lignin, and hemicelluloses. The efficient transformation of cellulosic raw materials into fermentable sugars requires the use of effective pretreatment strategies. The methods employed for pretreatment should be efficient, have low operating costs, and exhibit lower environmental impact. The present review describes pretreatment methods like liquid hot water (LHW) and steam explosion (SE) and highlights peculiar features, benefits and disadvantages of these processes. The effectiveness of these pretreatment methods and their effect on cellulosic raw materials strongly depends on the type of feedstock (component composition), pretreatment method, and pretreatment conditions (pressure, temperature, time, etc.). The LHW pretreatment requires neither addition of chemicals and catalysts nor grinding stage, but requires high energy inputs. The SE pretreatment is regarded as environmentally friendly and requires lower energy inputs, but contributes to the formation of toxic compounds. The life cycle assessment approach demonstrated that the SE pretreatment outperforms dilute acid pretreatment methods and allows the reduction of energy inputs, thereby improving the environmental performance of the process, while the LHW method improves long-term energy security and creates a greener future.
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页数:17
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