亜麻くずの酸素--アルカリの蒸解
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概要
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A flax tow sample from China (cf. Table 1) was cooked with oxygen and alkali under various conditions. Yields and properties of the oxygen-alkali flax pulp (OAP) were compared with those of soda (AP) and neutral sulfite semichemical flax pulps (NSSCP). <BR>Alkali charge, liquor ratio, cooking temperature, and cooking time showed significant effects on the properties of pulps obtained (cf. Fig. 1 and 2).<BR>As to the yield and brightness of OAP, the optimum conditions without addition of MgCO<SUB>3</SUB> seemed to be as follows : 5% alkali charge on sample, 1 : 2 liquor ratio, 11O°C cooking temprature, 3 hrs. cooking time, and 7 kg/cm<SUB>2</SUB> O<SUB>2</SUB> pressure, respectively.<BR>It was found that the addition of MgCO<SUB>3</SUB> was ineffective at lower alkali charge of 5%, but it resulted in remarkable improvement in yield, brightness, and strengths of the pulp at higher alkali charge above 5%, with selective delignification from fiber surfaces and without degradation of carbohydrate (cf. Fig. 3-6). <BR>When compared with the pulps treated by centri-cleaner, OAP was white in color and of much higher brightness than NSSCP, and it required more bleaching chemicals to obtain the same brightness (Table 2).<BR>Paper strengths of OAP (ex. OAP-3, 4) were compared with those of NSSCP. One of the disadvantages of OAP was lower opacity due to the increase of hemicellulose content and bonding area (Table 3 and Fig. 6). <BR>It was shown that OAP was inferior to NSSCP from the color revertion test (cf. Fig. 7). <BR>The color and COD of spent liquor from OAP were less than those of AP and NSSCP (cf. Fig. 8 and 9).
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