Clean production technology of integrated pretreatment for Lignocellulose

Pretreatment is a key step for lignocellulose converting into universal raw material for industries as alternative of petroleum. This review discusses that single pretreatment lacks cost-competitiveness because only one product takes responsibility for all cost. Based on the inheterogeneity of lignocellulose and the advantages of steam explosion pretreatment, steam explosion integrated pretreatment is proposed as strategy to solve the problem above. Steam explosion integrates with different pretreatment technologies to deconstruct lignocelluloses selectively for multiple products. By comparison, steam explosion-washing-alkali extraction-mechanical carding integrated pretreatment is considered the best. Finally, industrial demonstration of this integrated pretreatment is given out. With this integrated process, the recovery yields of cellulose, hemicelluloses and lignin reached 70, 80 and  80%, respectively.   Key words: Clean production technology, Lignocellulose, Integrated pretreatment, steam explosion, industrialization.