WHEAT STRAW PRE-EXTRACTION WITH HOT WATER AND THE RECOVERED PULPING LIQUOR AND ITS EFFECTS ON PULPING AND PAPER PROPERTIES

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FEYZMAND MOKHTAR; RESALATI HOSSEIN; KERMANIAN HOSSEIN; JALALI TORSHIZI HOSSEIN; RAMEZANI OMID

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Paper Information

Journal: Nashrieh Shimi va Mohandesi Shimi Iran Year:2013 | Volume:31 | Issue:3-4 (66) Page(s): 71-78

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Title

WHEAT STRAW PRE-EXTRACTION WITH HOT WATER AND THE RECOVERED PULPING LIQUOR AND ITS EFFECTS ON PULPING AND PAPER PROPERTIES

Author(s)

Keywords

WHEAT STRAWQ2

HOT WATER PRE-EXTRACTIONQ2

LIQUOR RECOVERINGQ2

SODA-AQ PULPINGQ2

Abstract

Hemicellulose pre-extraction and recovering before pulping process is an approach for supplying the sugar feedstock used in production of fuels and chemicals. WHEAT STRAW HOT WATER PRE-EXTRACTION for reaching to 10 % weight loss was carried out in the present study. Pre-extracted liquor from each stage was used as a media for subsequent extraction stage (three stages) in pre-extraction process. The results showed that SODA-AQ PULPING of pre-extracted straw is performed at less severe conditions i.e. shorter time and lower temperature as compared to non-pre-extracted straw. The pulping yield of pre-treated straw was higher than control pulp; however, the total pulp yield (based on oven dried weight of raw straw) was lower in the pre-extracted samples. Due to lack of hemicelluloses, pre-extracted pulps showed a weaker response to refining and the produced hand sheets had lower tear index and air resistant than hand sheets made of non-pre-extracted pulp, while no significant difference was noticed in burst and tensile indices of hand sheets produced from extracted and non-extracted pulp samples.

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