Bleached chemical pulp from kenaf by sodium bisulphite process / Chien Chu, Naiyana Niyomwan, Anchalee Puangvichit
โดย: Chu, Chien
ผู้แต่งร่วม: Niyomwan, Naiyana | Puangvichit, Anchalee | Thailand Institute of Scientific and Technological Research
Language: English ชื่อชุด: Class. Invest. no. 2ข้อมูลการพิมพ์: Bangkok : Thailand Institute of Scientific and Technological Research, 1971 หัวเรื่อง: Bleaching | Kenaf | Pulps | Sodium bisulphite processสารสนเทศออนไลน์: Click here to access full-text สาระสังเขป: Bleached chemical pulp from Cuban kenaf stalks (Hibiscus cannabinus) was prepared by sodium bisulphite process. Fresh kenaf is casier to pulp and bleach than dry kenaf.สาระสังเขป: Dry Cuban kenaf chips were cooked the same conditions as the fresh kenaf chips, except the time to reach 150 degree Celsius was 2.5 hours instead of 2 hours to allow better impregnation. The cooking yield after refining and washing was 54.4 per cent, much lower than from fresh kenaf. Bleaching the pulp from dry kenaf required 12 per cent equivalent chlorine. The bleaching sequence was DC/E/D/H for brightness 85. The bleached yield was 79 per cent based on unbleached pulp or 43 per cent on ovendry chips. The pulp strength was slightly lower than that from fresh kenaf but showed quality comparable with that of bleached kraft pulp from dry Cuban kenaf.สาระสังเขป: Fresh kenaf chips were heated in sodium bisulphite solution to 150 degree Celsius in 2 hours and cooked at 150 degree Celsius for 4.5 hours with liquor 4: 1 and total SO2 16 per cent on ovendry chip weight. The crude pulp was defibred in a disc refiner and washed. The yield was 62 per cent.สาระสังเขป: The great difference of bleached yields and bleach consumption between fresh kenaf and dry kenaf is significant. - Authors.สาระสังเขป: The pulp was bleached with a total of 10 per cent equivalent chlorine by a C/E/H/D sequence to brightness 75. The bleached yield was 85 per cent based on the unbleached pulp or 53 per cent on ovendry chips. The bleached pulp indicated good strength comparable to kenaf kraft pulp.
| ชนิดของทรัพยากร | Location | Call number | สถานะ | Last seen | Copy No. | บาร์โค้ด |
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วว. เทคโนธานี | Available | 2018-08-31 | 1 | RP1971/266 | |
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วว. เทคโนธานี | Available | 2018-08-31 | 2 | RP1971/266-2 |
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