ON THE EFFECT OF ALKALI TREATMENT AT HIGH TEMPERATURE FOR PULP QUALITY

Yasusuke Shinomiya

doi:10.2115/fiber1925.18.53

Yasusuke Shinomiya

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JOURNAL FREE ACCESS

1942 Volume 18 Issue 2 Pages 53-61

DOI https://doi.org/10.2115/fiber1925.18.53

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Published: 1942 Received: - Available on J-STAGE: November 27, 2008 Accepted: November 01, 1941 Advance online publication: - Revised: -
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Date of correction: November 27, 2008 Reason for correction: - Correction: DTRECEIVED Details: Wrong : 19411101

Date of correction: November 27, 2008 Reason for correction: - Correction: ABSTRACT Details: Wrong : With the object of improving the quality of pulp by alkali treatment at high temperature, the following researches are published in this paper and submitted for reference.
Now, pulp refining at high temperature inserted for the middle process at the multistage of the bleaching process, and in the first place, it is most important to give a suitable treatment to the unbleached pulp.
That fact has to do with pre-bleaching for unbleached pulp.
At the first stage in the multistage bleaching process chlorine is used very efficiently, but Ligno chlorinic Salts which remain in the pulp after washing will be rejected by alkali refining at high temperature with hemi-cellulose, and this process is perfected by using after-bleaching a little oxidising agent.
Comparison of refined degree of pulp.
The conclusion drawn from the results obtained is as follows.
After first doing extreme chlorination at a low temperature, refining at a high temperature is done by adding alkali in various concentrations, and when the liquor is in the bleacher it is buffered by again adding an alkali solution afterbleaching I have found that the degree of refinement of the refined pulp heightened by adding alkali the larger the quantity the better.
Details are as follows:
In the ease of unbleached puln of the following composition.
α-cellulose 87%
viscosity 35
bleacheability 9_??_11%
hardness 70 sec.
Alkali treatment. (in chlorination at low temperature)
concentration of pulp in bleather 5%
quantity of alkali added 2_??_8%
temperature 85_??_97°C
hours of treatment 3_??_4 hr.
after-bleacking
concentration of pulp 5%
quantity of alkali added 0.5_??_1.0%
temperature 40°C
By the above details the results as indicated in the above fig. are obtained and better than the standard degree of whiteness is obtained.

Date of correction: November 27, 2008 Reason for correction: - Correction: CITATION Details: Wrong : 2. Andrews & Bray, Ind. Eng. Chem., 15, 934 (1923).
3. E. Ennevoora. Pacific-pulp & paper-Industry, Vol. 10, No. 11, 20 (1936).
4. Z. Angeu, Chem. 41, 493 (1928). paper Trade J. Sept. 8 (1838).
5. M. W. phelps & F. Schuber. paper Trade F., 106, No. 8, 126 (1938).
6. M. W. phelps & F. Schuber. paper Trade F., 106, No. 8, 126 (1938).
7. M. W. phelps & F. Schuber. paper Trade F., 106, No. 8, 126 (1938).
8. DRP. Anm. D. 59, 231, Juli 18 (1935).
9. L. Rys u. A. Bönish, Zellstoff u. paper. 18, 573 (1938).

Right : 2. Andrews & Bray, Ind. Eng. Chem., 15, 934 (1923).
3. E. Ennevoora. Pacific-pulp & paper-Industry, Vol. 10, No. 11, 20 (1936).
4. Z. Angeu, Chem. 41, 493 (1928).
4. paper Trade J. Sept. 8 (1838).
5. M. W. phelps & F. Schuber. paper Trade F., 106, No. 8, 126 (1938).
6. M. W. phelps & F. Schuber. paper Trade F., 106, No. 8, 126 (1938).
7. M. W. phelps & F. Schuber. paper Trade F., 106, No. 8, 126 (1938).
8. DRP. Anm. D. 59, 231, Juli 18 (1935).
9. L. Rys u. A. Bönish, Zellstoff u. paper. 18, 573 (1938).

Date of correction: November 27, 2008 Reason for correction: - Correction: PDF FILE Details: -

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