Delignification of wheat straw with potassium hydroxide solutions using potassium black liquor as an organomineral fertilizer
https://doi.org/10.21266/2079-4304.2023.242.216-231
Abstract
In the production of cellulose by the natron method from non-wood raw materials small enterprises cannot dispose of black liquor. It is possible to effectively dispose of used cooking solutions in the transition to cooking with KOH solutions instead of NaOH and black liquor to use as an organomineral fertilizer. The goal of the study was to obtain cellulose from wheat straw with potassium hydroxide solutions under various cooking conditions and to evaluate the possibility of using spent cooking solutions as an organomineral fertilizer. Cooking was carried out under the conditions: hydromodule 8:1; consumption of alkali in units. K2O and Na2О – 10–16% of absolutely dry raw materials; temperature rise 60 min; cooking at 160 C – 60 min. When cooking with KOH solutions, the impregnation stage was carried out and studied. Solutions for irrigation with specified concentrations were prepared from the spent black liquor from cooking wheat straw with a consumption of 14%. Additional impregnation makes it possible to obtain potassium cellulose comparable to sodium in terms of the mass fraction of lignin and with a lower ash content. A decrease in the impregnation temperature by 5 C leads to a decrease in the heating temperature of the suspension by 0.4–2.3 C, a reduction in the heating time by 3 times and an acceleration of cooling of the system by an average of 5 times. It was found that KOH solutions promote better removal of SiO2 from plant raw materials than NaOH solutions under the specified cooking conditions. It was found that the used cooking solution is suitable as an organomineral fertilizer with a concentration of 2.8·10–5 g of suspended solids per liter.
About the Authors
A. V. Vurasko
Ural State Forest Engineering University
Russian Federation
Russian Federation
VURASKO Alesya V. – DSc (Technical), Professor of the department technology of pulp and paper industries and polymer processing
620100. Siberian tract 37. Yekaterinburg
A. L. Sherstobitov
Ural State Forest Engineering University
Russian Federation
Russian Federation
SHERSTOBITOV Alexey L. – Engineer of the Department of Technologies of Pulp and Paper Production and Polymer Processing
620100. Siberian tract 37. Yekaterinburg
M. A. Ageev
Ural State Forest Engineering University
Russian Federation
Russian Federation
AGEEV Maksim A. – PhD (Technical), Associate Professor of the department technology of pulp and paper industries and polymer processing
620100. Siberian tract 37. Yekaterinburg
V. P. Sivakov
Ural State Forest Engineering University
Russian Federation
Russian Federation
SIVAKOV Valeriy P. – DSc (Technical), Professor Department of Technological Machines and Mechanical Engineering Technology
620100. Siberian tract 37. Yekaterinburg
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Review
For citations:
Vurasko A.V., Sherstobitov A.L., Ageev M.A., Sivakov V.P. Delignification of wheat straw with potassium hydroxide solutions using potassium black liquor as an organomineral fertilizer. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2023;(242):216-231. (In Russ.) https://doi.org/10.21266/2079-4304.2023.242.216-231
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