Manufacturing method of dissolving kraft pulp
A technology of kraft pulp and hydrolysis kettle, which is applied in papermaking, textiles and papermaking, pulping with inorganic alkali, etc. It can solve the problems of rayon filtration and spinning difficulties, etc.
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experiment example 1
[0104] The radiata pine wood chips were sieved using a sieving device (gyro conversion mechanism) to obtain wood chips with a size of 9.5 to 25.4 mm.
[0105] Using a rotary autoclave equipped with a thermometer, water was added to 200 g of the dry wood chips so that the liquid ratio was 3.2 (L / kg), the temperature was raised to 168-170° C., and the prehydrolysis treatment was performed in batches. The retention time (residence time) at the highest temperature was varied within a range of 0.05 minutes (3 seconds) to 70 minutes, and the P factor was varied within a range of 150 to 950 (samples 2 to 8). In addition, in the following table|surface, the sample 1 is the sample obtained by kraft cooking without prehydrolysis treatment.
[0106] After the pre-hydrolysis is finished, the wood chips and the pre-hydrolysis liquid are separated with a 300-mesh filter cloth to obtain the pre-hydrolyzed wood chips and the pre-hydrolysis waste liquid. The absorbance at a wavelength of 280 ...
experiment example 2
[0119] The experiment was carried out in the same manner as in Experimental Example 1 except that the wood chips used as the raw material were changed from those of radiata pine to those of larch. The results are shown in Table 2 and Figure 6 ~ Figure 8 . Depend on Figure 6 It is clear that even if the wood chips used as raw materials are changed, the absorbance of the pre-hydrolysis waste liquid at a wavelength of 280 nm and the P factor also show a very high correlation (R 2 = 0.9713).
[0120] Similar to Experimental Example 1, the absorbance of the wavelength 280nm of the pre-hydrolysis waste liquid was shown to be related to the Kappa number and the amount of hemicellulose of the dissolved kraft pulp ( Figure 7 , 8 ).
[0121] In addition, similarly to Experimental Example 1, when the absorbance of the pre-hydrolysis waste liquid at a wavelength of 280 nm is used as an index, it can be seen that the kappa number can be efficiently reduced when the absorbance is in...
experiment example 3
[0125] use Figure 9 The plant shown is for the continuous production of dissolving kraft pulp at a practical level. The device used in this experiment possesses preceding hydrolysis kettle 4 (capacity: 356m 3 ) and kraft cooking kettle 6 (capacity: 860m 3 ).
[0126] Warm water was added to radiata pine wood chips with a chip meter screw (chip meter screw) 2 so that the liquid ratio was 1.8 (L / kg), and it was continuously poured into the pre-hydrolysis tank 4, and the hydrolysis treatment was performed at a pre-hydrolysis temperature of 170°C. At this time, the pre-hydrolysis waste liquid is extracted with the filter 5 . Use a flow meter as a standard to control the amount of each liquid delivery of the pre-hydrolysis waste liquid and dilution water after extraction, and dilute it to 1000 times, and use the pump (LC-20AD manufactured by Shimadzu Corporation) to send the diluted liquid to light absorption. A photometric detector (SPD-10Ai manufactured by Shimadzu Corporati...
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