RESOURCE-SAVING TECHNOLOGY OF HIGH-QUALITY TYPES OF PAPER AND CARDBOARD FROM SECONDARY FIBROUS SEMI-FINISHED PRODUCTS

UDC 676.2.038

 

Chernaya Natalia Viktorovna – DSc (Engineering), Professor, Professor, the Department of Chemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: chornaya@belstu.by

Gordeyko Svetlana Aleksandrovna ‒ PhD (Engineering), Associate Professor, Assistant Professor, the Department of Сhemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: sveta_gordeiko@mail.ru

Herman Natalia Aleksandrovna ‒ PhD (Engineering), Assistant Lecturer, the Department of Сhemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: herman_n@belstu.by

Chernysheva Tamara Vladimirovna – Senior Researcher, the Department of Chemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: chernysheva@belstu.by

 Dashkevich Svetlana Arkad’yevna – Master’s degree student, the Department of Chemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: dashkevich@belstu.by Misyurov Oleg Aleksandrovich – PhD student, the Department of Chemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: omisurov@mail.ru

 

DOI: https://doi.org/ 10.52065/2520-2669-2024-277-4.

 

Key words: cationic polyelectrolyte, homocoagulation, heteroadagulation, resource-saving technology.

For citation: Chernaya N. V., Gordeyko S. A., Herman N. A., Chernysheva Т. V., Dashkevich S. A., Misyurov O. A. Resource-saving technology of high-quality types of paper and cardboard from secondary fibrous semi-finished products. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2024, no. 1 (277), pp. 36–42 (In Russian). DOI: 10.52065/2520-2669-2024-277-4.

 

Abstract

The regularities of the influence of the compositions of waste paper masses on the content of dry substances in the subshell water and the degree of retention of the components present in the structure of paper and cardboard are established. The resulting paper masses differed in the content of hydrodispersion of modified rosin (HMR), electrolyte (E), hardening agent (HA) and the type of cationic polyelectrolyte (CP) present, as well as the sequence of introduction of the chemicals used into the waste paper masses. Polyamide polyamine epichlorohydrin resin (weakly basic CP), polydimethyldiallylammonium chloride (strongly basic CP) and a copolymer of acrylamide with methylene chloride dimethylamminopropylacrylamide (strongly basic CP) were used as CP. The developed resource-saving technology of high-quality types of paper and cardboard from waste paper raw materials, in contrast to the existing method of their production, is based on a change in the ratio of HMR : E : HA : CP, expressed as a percentage of absolutely dry fiber, from 1 : 4.5 : 0.8 : 0.3 to 1 : (0.6–0.8) : 0 : (0.01–0.04). This method made it possible to increase the efficiency of the ongoing processes of sizing (coagulation, peptization and heteroadagulation), hardening and flocculation. It is established that the resource-saving effect is achieved, firstly, by shifting the sizing process from the traditional mode of homocoagulation to a more efficient mode of heteroadagulation and, secondly, by replacing the strong-base CP with a weak-base one. The developed technology makes it possible to reduce the electrolyte consumption by 4–5 times, exclude the hardening agent from the composition of the paper masses and reduce the CP consumption by 5–6 times. The resource-saving effect is enhanced by increasing the degree of retention of fibers from 94.3 to 98.5% and sizing complexes from 70.0 to 95.3–98.4%.

 

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15.11.2023