Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process

The possibilities of dissolving grade pulp production from poplar by an ethanol-water process were investigated. The effects of ethanol ratio, cooking temperature and acid catalyst ratio on unbleached, bleached and alkali-purified pulps were studied. It was seen that catalyst ratios exceeding 0.01% caused serious yield and viscosity losses. The results showed that with the catalyst ratio to pulping liquor exceeding 0.01%, pulp yield and viscosity were reduced to an unacceptable level. The best pulping result was obtained at 40% ethanol consistency, 180 ºC pulping temperature and 150 min reaction time without the addition of acid catalyst to the pulping liquor. After bleaching and alkali purification, the pulp obtained had a 30.7% yield, 95.8% a-cellulose content, 677 cm3/g viscosity, 83% ISO brightness, 1.80% residual pentosans, 0.33% copper number and 0.14% ash content. However, brightness was increased to 88.5% ISO level with the application of a multistage bleaching (CEHDED) sequence instead of chlorite bleaching without serious losses in yield or a-cellulose content at normal viscosity levels. It is concluded that these pulps meet dissolving grade pulp quality requirements.

Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process

The possibilities of dissolving grade pulp production from poplar by an ethanol-water process were investigated. The effects of ethanol ratio, cooking temperature and acid catalyst ratio on unbleached, bleached and alkali-purified pulps were studied. It was seen that catalyst ratios exceeding 0.01% caused serious yield and viscosity losses. The results showed that with the catalyst ratio to pulping liquor exceeding 0.01%, pulp yield and viscosity were reduced to an unacceptable level. The best pulping result was obtained at 40% ethanol consistency, 180 ºC pulping temperature and 150 min reaction time without the addition of acid catalyst to the pulping liquor. After bleaching and alkali purification, the pulp obtained had a 30.7% yield, 95.8% a-cellulose content, 677 cm3/g viscosity, 83% ISO brightness, 1.80% residual pentosans, 0.33% copper number and 0.14% ash content. However, brightness was increased to 88.5% ISO level with the application of a multistage bleaching (CEHDED) sequence instead of chlorite bleaching without serious losses in yield or a-cellulose content at normal viscosity levels. It is concluded that these pulps meet dissolving grade pulp quality requirements.

Kaynak Göster

Bibtex @ { tbtkagriculture138643, journal = {Turkish Journal of Agriculture and Forestry}, issn = {1300-011X}, eissn = {1303-6173}, address = {}, publisher = {TÜBİTAK}, year = {2002}, volume = {26}, pages = {239 - 245}, doi = {}, title = {Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process}, key = {cite}, author = {Kırcı, Hüseyin} }
APA Kırcı, H . (2002). Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process . Turkish Journal of Agriculture and Forestry , 26 (5) , 239-245 . Retrieved from https://dergipark.org.tr/tr/pub/tbtkagriculture/issue/11643/138643
MLA Kırcı, H . "Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process" . Turkish Journal of Agriculture and Forestry 26 (2002 ): 239-245 <https://dergipark.org.tr/tr/pub/tbtkagriculture/issue/11643/138643>
Chicago Kırcı, H . "Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process". Turkish Journal of Agriculture and Forestry 26 (2002 ): 239-245
RIS TY - JOUR T1 - Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process AU - Hüseyin Kırcı Y1 - 2002 PY - 2002 N1 - DO - T2 - Turkish Journal of Agriculture and Forestry JF - Journal JO - JOR SP - 239 EP - 245 VL - 26 IS - 5 SN - 1300-011X-1303-6173 M3 - UR - Y2 - 2021 ER -
EndNote %0 Turkish Journal of Agriculture and Forestry Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process %A Hüseyin Kırcı %T Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process %D 2002 %J Turkish Journal of Agriculture and Forestry %P 1300-011X-1303-6173 %V 26 %N 5 %R %U
ISNAD Kırcı, Hüseyin . "Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process". Turkish Journal of Agriculture and Forestry 26 / 5 (Mayıs 2002): 239-245 .
AMA Kırcı H . Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process. Turkish Journal of Agriculture and Forestry. 2002; 26(5): 239-245.
Vancouver Kırcı H . Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process. Turkish Journal of Agriculture and Forestry. 2002; 26(5): 239-245.
IEEE H. Kırcı , "Production of Dissolving Grade Pulp from Poplar Wood by Ethanol-Water Process", Turkish Journal of Agriculture and Forestry, c. 26, sayı. 5, ss. 239-245, May. 2002