CONTINUOUS PROCESS FOR PRETREATING A LIGNO-CELLULOSIC FEEDSTOCK

CONTINUOUS PROCESS FOR PRETREATING A LIGNO-CELLULOSIC FEEDSTOCK

It is disclosed a continuous process for pre-treating a ligno-cellulosic feedstock. The ligno-cellulosic feedstock is introduced in a pressurized reactor vessel and subjected to a hydrothermal treatment with steam by inserting steam from at least a two steam streams having different temperatures. Th...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: CHERCHI, FRANCESCO, GIORDANO, DARIO
Format: Patent
Sprache:eng ; srp
Schlagworte:
FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
PAPER-MAKING
PRODUCTION OF CELLULOSE
TEXTILES
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Beschreibung
Zusammenfassung:It is disclosed a continuous process for pre-treating a ligno-cellulosic feedstock. The ligno-cellulosic feedstock is introduced in a pressurized reactor vessel and subjected to a hydrothermal treatment with steam by inserting steam from at least a two steam streams having different temperatures. The ligno-cellulosic feedstock is then subjected to steam explosion. Preferably, at least a portion of the steam in the reactor is superheated steam and the superheated steam is located in a superheated zone which is in proximity of the outlet of the pressurized reactor vessel.