Chemical pulp from kenaf by kraft and polysulphide processes/ 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, 1972 หัวเรื่อง: Kenaf | Kraft process | Polysulphide process | Pulpsสารสนเทศออนไลน์: Click here to access full-text สาระสังเขป: Bleached kraft pulps were prepared from Cuban kenaf (Hibiscus cannabinus) and Thai kenaf (Hibiscus sabdariffa) by two modified kraft processes. One was polysulphide process. It gave higher yield of pulp than conventional kraft process. Cooking yields about 50% on chip weight were obtained from both Cuban kenaf and Thai kenaf by cooking at 170 degree Celsius for 1.5 hours. The polysulphide pulps with permanganate no. about 20 were bleached by DC/E/D sequence with about 8 to 9% equivalent chlorine to brightness 75-87%. The strength of bleached kenaf polysulphide pulps and kraft pulps was comparable to softwood bleached kraft pulp except for bursting strength.สาระสังเขป: The other modified kraft process was alkaline pretreatment with about 2% sodium sulphide on chip weight at 110-120 degree Celsius for 30-60 minutes before alkaline pulping by soda, kraft, or polysulphide process at 170 degree Celsius for 60-90 minutes. The pretreatment improved bleachability and strength of the pulps.
| ชนิดของทรัพยากร | Location | Call number | สถานะ | Last seen | Copy No. | บาร์โค้ด |
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วว. เทคโนธานี | Available | 2018-08-31 | 1 | RP1972/271 | |
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วว. เทคโนธานี | Available | 2018-08-31 | 2 | RP1972/271-2 |
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