Production method for dissolving kraft pulp
A technology of kraft pulp and hydrolysis kettle, applied in papermaking, textile and papermaking, pulping with inorganic alkali, etc., can solve the problems of rayon filtration, 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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