By means of uniform and rotating regression design optimal steam explosion conditions for the ligno-cellulosic waste,namely the fibrous trash from material preperation of a paper mill ,and the effects of steam pressure,holding time and acid addition on hemicellulose recovery and enzymatic susceptibility of cellulosic residue were investigated. It was found that 1. 5-1. 6 MPa,17- 18 min and with no acid addition were proper conditions for both. The mechanism of steam explosion was preliminarily studied.
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