Chemical pulp from kneaf by neutral sulphite 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: Kenaf | Neutral sulphite process | Pulpsสารสนเทศออนไลน์: Click here to access full-text สาระสังเขป: Air dry Cuban kenaf gave 56% unbleached pulp by cooking at liquor ratio 3: 1 with 16.4 per cent sodium sulphite. The cooking condition was heating in 2 hours to 170 degree Celsius and cooking at 170 degree Celsius for 2 hours. The crude pulp was refined and washed. The pulp has good strength and light colour.สาระสังเขป: Chemical pulp with bleached yield about 50 per cent and brightness 80 per cent was obtained from air dry Thai kenaf (H. sabdariffa). The kenaf chips were cooked with 21 per cent sodium sulphite buffered with 2.5 per cent sodium bicarbonate at liquid ratio 3: 1. The cooking condition was heating to 170 degree Celsius in 2.5 hours and cooking at 170 degree Celsius for 3 hours. The crude pulp after refining and washing gave a yield of 62 per cent.สาระสังเขป: Fresh Cuban kenaf (Hibiscus cannabinus) chips yielded 63% pulp by heating in a sodium sulphite solution at liquor ratio 4: 1 for 3 hours to 170 degree Celsius and cooking at 170 degree Celsius for 3 hours. The sodium sulphite solution contained 18 per cent sodium sulphite on ovendry chip weight. The solution was buffered with 2 per cent sodium bicarbonate. The pulp was bleached to brightness 70 per cent with DC/E/D sequence, which had a total of 12 per cent rquivalent chlorine. The bleached yield was 79 per cent on pulp weight or 50 per cent on ovendry chips. The bleached pulp had good quality comparable to bleached kenaf kraft pulp except for lower opacity.สาระสังเขป: Kenaf responded well to neutral sulphite pulping foaturing high yield of pulp with good strength but bleach demand was high and amount of chemicals applied for preparing bleachable pulp was high requiring a chemical recovery system.สาระสังเขป: The strength of the from Thai kenaf was developed by bleaching in C/E/H/D Sequence with a total of 13.5% equivalent chlorine for a brightness about 80 per cent. The pulp has good strength superior to softwood sulphite pulp except for opacity and tearing strength. - Authors.
| ชนิดของทรัพยากร | Location | Call number | สถานะ | Last seen | Copy No. | บาร์โค้ด |
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วว. เทคโนธานี | Available | 2018-08-31 | 1 | RP1971/269 | |
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วว. เทคโนธานี | Available | 2018-08-31 | 2 | RP1971/269-2 |
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