頁籤選單縮合
題 名 | 難漂化學紙漿的臭氧漂白=Study on the Ozonal Bleaching of Hard-to-bleach Chemical Pulps |
---|---|
作 者 | 蘇裕昌; 葉若鋆; 陳鴻財; | 書刊名 | 臺灣林業科學 |
卷 期 | 17:1 2002.03[民91.03] |
頁 次 | 頁67-74 |
分類號 | 476.21 |
關鍵詞 | 化學漿漂白; 無氯漂白; 臭氧紙漿; 難漂紙漿; Chemical pulp bleaching; Non-chlorine; Zone bleaching pulp; Hard-to-bleach pulp; |
語 文 | 中文(Chinese) |
中文摘要 | 本論文在不同紙漿含水率、不同臭氧濃度(高濃度)之條件下探討難漂白化學紙漿之漂白,由其臭氧消耗率(消耗量/添加量)、單位臭氧的白度提昇、單段漂白白度等評估漂白效益,並選用無氯元素漂白流程Z-E1-D1-E2-D2,以瞭解難漂化學臭氧漂的可行性,同時針對臭氧漂白易損傷纖維的性質,進一步探討pH值及酸保護劑對臭氧漂白影響。臭氧漂白於含水率40-60%時有最大的反應性,漂白紙漿有最佳的單位臭氧的白度提昇、最低卡巴值及較低程度的黏度損失。臭氧消耗率隨紙漿含水率增加而增加,含水率65%達到最高。Z-E1-D1-E2-D2流程可處理難漂漿的問題,闊葉樹難漂紅柳桉漿經D1漂段後白度已達80%ISO以上。針闊葉樹無論為難漂漿與否,在Z-E1-D1-E2-D2漂白流程中,白度均可漂至80%ISO以上;臭氧漂白在低pH值時可抑制纖維素的膨潤性,降低對臭氧的反應性,而達較佳的漂白性,酸保護劑亦有類似的機制,其中以丙酸具最佳之何護效果。 |
英文摘要 | This study investigated the influence of ozonation on the bleachability of the sulfate pulp of certain hard-to-bleach woods (Shorea albida and Taiwania cryptomerioides). Oznone consumption, pulp brightness, and pulp viscosity were measured at different pulp moisture contents and ozone concentrations. An ECF (elemental chlorine-free) bleaching sequence Z-E1-D1-E2-D2 for the hard-to-bleach pulps was also conducted. The greatest ozonation reaction took place at moisture content levels of 40-60%. At these levels, the resulting pulps attained the highest brightness, lowest kappa number, and a medium degree of viscosity loss. The higher the moisture content was, the greater the O3 consumption. Maximum O3 consumption was elicited at 65% moisture content. The 3-stage Z-E1-D1 sequence can easily provide satisfactory brightness with S. albida pulp exceeding 80% ISO even in the D1 stage. The brightnesses of all hard-to-bleach wood species were over 85% ISO after the Z-E1-D1-E2-D2 bleaching sequence. At low pH, swelling of cellulose is inhibited. Therefore the reactivity of cellulose with ozone is reduced, resulting in a better bleaching effect with ozonation. Acidic protective additives showed the same effect as well. |
本系統中英文摘要資訊取自各篇刊載內容。