Bleached chemical pulp from kenaf by ammonium bisulphite process / Chien Chu, Naiyana Niyomwan, Anchalee Puangvichit
โดย: Chu, Chien
ผู้แต่งร่วม: Niyomwan, Naiyana | Puangvichit, Anchalee
Language: English ชื่อชุด: Class. Invest. no. 2ข้อมูลการพิมพ์: Bangkok : Thailand Institute of Scientific and Technological Research, 1971 หัวเรื่อง: Ammonium bisulphite process | Bleaching | Kenaf | Pulpsสารสนเทศออนไลน์: Click here to access full-text สาระสังเขป: Kenaf stalks of Hibiscus cannabinus yields 45 per cent bleached pulp by ammonium bisulphite pulping and 3-stage bleaching. Air dry kenaf chips were pulped at liquor ratio 4: 1 with ammonium bisulphite solution containing 18 per cent total SO2 on chip weight. The chips were heated with the cooking solution at pH 3.2 in a tumbling digester to 150 degree Celsius in 2 hours and cooked at 150 degree Celsius for 4.5 hours. The softened chips were refined for defibration. The unbleached yield was 52 per cent on ovendry chips.สาระสังเขป: Pulping fresh Cuban kenaf stalks by ammonium bisulphite process was done with a total of 16 per cent total SO2 on chip weight under similar conditions. The yield was 51 per cent. The pulp was bleached in the same way as that for pulp from dry kenaf. The bleached yield attained 91 per cent on pulp weight with brightness 80. The pulp quality was inferior to that from dry kenaf. - Authors.สาระสังเขป: The pulp was bleached by C/E/H/D sequence with a total of 8 per cent equivalent chlorine. The bleached yield was 86 per cent on pulp weight with brightness 80. The quality of bleached pulp was better than hardwood kraft pulp and comparable to softwood sulphite pulp except for tearing strength.
| ชนิดของทรัพยากร | Location | Call number | สถานะ | Last seen | Copy No. | บาร์โค้ด |
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วว. เทคโนธานี | Available | 2018-08-31 | 1 | RP1971/267 | |
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วว. เทคโนธานี | Available | 2018-08-31 | 2 | RP1971/267-2 |
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