ON THE UTILIZATION OF “KAOLIANG” STALK. 1 THE DIGESTION OF STALK BY SODA PROCESS AND THE EFFECT OF PRELIMINARY TREATMENT ON THE DIGESTION

Ryuji Yamamoto

doi:10.2115/fiber1925.4.53

ON THE UTILIZATION OF “KAOLIANG” STALK. 1

THE DIGESTION OF STALK BY SODA PROCESS AND THE EFFECT OF PRELIMINARY TREATMENT ON THE DIGESTION

Ryuji Yamamoto

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1928 Volume 4 Issue 3 Pages 53-66

DOI https://doi.org/10.2115/fiber1925.4.53

[Correction] Sen-iso Kogyo Vol.4 No.4 (1928) pp.94-94

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Published: 1928 Received: - Available on J-STAGE: November 27, 2008 Accepted: February 01, 1928 Advance online publication: - Revised: -
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Date of correction: November 27, 2008 Reason for correction: - Correction: DTRECEIVED Details: Wrong : 19280201

Date of correction: November 27, 2008 Reason for correction: - Correction: ABSTRACT Details: Wrong : The “kaoliang” (Audropogon Sorghum Broth) is one of the staple produce in Manchuria, and the annual production of its stalk is estimated to be about 14, 400, 000 tons.
It has been considered that the “kaoliang” stalk is a material which is difficulty digestible and its pulp produced by soda process is bleached with great difficulty. In investigating on the digestion of stalk the author found that the preliminary treatment with hot water makes the subsequent stage of soda digestion as well as the bleaching of its pulp easily performed.
The experimental results obtained are summarized as follows :
(1) Although the size of fibres varied considerably with different parts of the stalk, the fibre of the whole stalk usually measured 0.726-2.235 mm in length and 0.009-0.014 mm in diameter at middle part.
(2) The proximate constituents and chemical constants of the whole stalk gave the following figures :
(3) The above figures varied, however, with different parts of stalk, the leaf being rich in ash content and the node acid pith in soluble matter, especially reducing substances.
(4) By the digestion with soda the rind gave the best pulp and the leaf and node the inferior kind of pulp owing to the difficulty in digestion and bleaching. No pulp was obtainable from the pith alone.
(5) It may be assumed that the difficulty in bleaching of soda pulp is due to the presence of certain substances of difficultly bleachable nature which are produced by the action of soda upon the soluble carbohydrate contained in large quantity in such parts as leaf, node and pith. It is, therefore, of great significance in pulp making from the “kaoliang” stalk to treat the stalk previously to digestion with hot water so as to remove the soluble carbohydrates as far as possible.
(6) The preliminary treatment of the stalk previous to the soda digestion was performed in the following way :
The raw material was heated in a closed vessel with about ten times of water at 100-120°C for 30-60 minutes and then separated from the liquid by filtration and pressing. By this treatment the stalk lost 11.2% of its organic substances, 56.7% of its ash and 95.7% of its reducing matter, while cellulose remained unchanged.
(7) The soda digestion was carried out under the following conditions :
Caustic soda used, 12% of the raw material; digestion temperature (pressure), 130-140°C (35-50 lbs./sq. in.); duration, 3-4 hrs. (8% of caustic soda may be sufficient for somewhat lower grade pulp.)
(8) The yield of unbleached pulp was 46% of the raw material employed. The raw pulp, colored faintly brown, could be bleached with only 2.97% of available chlorine, giving 36% yield of the bleached pulp based on the raw material. The analysis of the bleached pulp was shown as follows :
(9) Based on the experimental results the author concludes that by the preliminary treatment of the stalk with hot water previous to soda digestion the consumption of caustic soda can be saved by about 4% for 100 parts of raw material and that of available chlorine by 5.8% (or bleaching powder with 35.5% available chlorine by 16.4%).

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

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