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

Hüseyin KIRCI

Makale detayları

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

Yazarlar:

Hüseyin KIRCI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Agriculture and Forestry 2002 Vol.26 Issue 5, pp.239-245

Belge Tipi:

Makale

Yayın Tarihi:

4/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000809413

Sıklık:

İki Aylık

eISSN:

1303-6173

pISSN:

1300-011X

Anahtar kelimeler:

Özet:

 

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.

 

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.

Makale detayları

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

Yazarlar:

Hüseyin KIRCI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Agriculture and Forestry 2002 Vol.26 Issue 5, pp.239-245

Belge Tipi:

Makale

Yayın Tarihi:

4/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000809413

Sıklık:

İki Aylık

eISSN:

1303-6173

pISSN:

1300-011X

Poplar

organosolv pulping

ethanol-water pulping

dissolving pulp

alpha-cellulose

Sayı

Makale detayları

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

Yazarlar: Hüseyin KIRCI

Yayıncı: TUBITAK

Dergi: Turkish Journal of Agriculture and Forestry 2002 Vol.26 Issue 5, pp.239-245

Belge Tipi: Makale

Yayın Tarihi: 4/2002

Belge Dili: Türkçe

Document ID (Org No.): 2000809413

Sıklık: İki Aylık

eISSN: 1303-6173

pISSN: 1300-011X

Poplar

organosolv pulping

ethanol-water pulping

dissolving pulp

alpha-cellulose

Sayı

Yazarlar:

Hüseyin KIRCI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Agriculture and Forestry 2002 Vol.26 Issue 5, pp.239-245

Belge Tipi:

Makale

Yayın Tarihi:

4/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000809413

Sıklık:

İki Aylık

eISSN:

1303-6173

pISSN:

1300-011X