Quality Control of Activated Carbon by the Nuclear Magnetic Resonance Method
Journal Title: Lesnoy Zhurnal (Russian Forestry Journal) - Year 2022, Vol 12, Issue 5
Abstract
The production of activated carbon by pyrogenetic decomposition is a complex high-temperature process that involves several stages. The quality of the produced activated carbon primarily depends on the moisture content of raw material and the degree of removal of impurities from the solid carbon residue, operational assessment of which is rather difficult due to the production specifics. The use of NMR relaxometry methods can significantly speed up the process of measuring these parameters in at-line, on-line and in situ conditions. The research aims at determining the absolute moisture content of the raw material, intermediate and finished products, as well as controlling their pyrolysis degree at different stages of activated carbon production via proton density. Samples of the lignocellulosic group (from wet raw material to the finished product) were the research objects. NMR experiments with the Magic Sandwich Echo (MSE) pulse sequence were carried out for measuring the moisture content and proton density of the samples. The study revealed an unambiguous correlation between the values of proton density and the pyrolysis degree of the samples. The experimental results can be used in further improvement of the proposed methods for estimating the specified parameters. It was found that the MSE experiment makes it possible to determine quite accurately the moisture content in both the initial plant raw material and the carbonization products, including activated carbon. The paper presents data on the dynamics of changes in the proton density of samples of plant raw materials during thermal decomposition. A direct correlation was found between changes in the proton density of the samples and their specific density during thermal processing. The proton density of the raw material samples has different values, while the proton density of the carbon samples varies much less. This observation shows that chemicals are being removed from the samples, causing the proton density to decrease. The research results will improve the systems of intermediate and final control in the process of obtaining activated carbon by thermal processing. Acknowledgments: The research was carried out using the equipment of the Center for Collective Use “Nanomaterials and Nanotechnologies” of the Kazan National Research Technological University with the financial support of the project by the Ministry of Science and Higher Education of the Russian Federation within the framework of grant No. 075-15-2021-699. For citation: Safin R.G., Sotnikov V.G., Grunin L.Yu., Ivanova M.S., Ziatdinova D.F. Quality Control of Activated Carbon by the Nuclear Magnetic Resonance Method. Lesnoy Zhurnal = Russian Forestry Journal, 2022, no. 5, pp. 173–185. (In Russ.). https://doi.org/10.37482/0536-1036-2022-5-173-185
Authors and Affiliations
Rushan G. Safin, Viktor G. Sotnikov, Leonid Yu. Grunin, Maria S. Ivanova, Dilyara F. Ziatdinova
Keywords
Related Articles
- EP ID EP710360
- DOI 10.37482/0536-1036-2022-5-173-185
- Views 89
- Downloads 0
Device for Wood-Cutting Tool Hardening
Choosing effective methods and devices for surface hardening of wood-cutting tools is problematic due to the variety of their designs and operating conditions. In this regard, the development of such devices becomes an u...
Sulphate Soap Separation from Wood Mixture Cooking Black Liquor
The sulphate soap separation from black liquor is influenced by a large number of factors: wood species composition, physical properties and composition of liquor components. The bases of the process are widely researche...
Soil Characteristics of Embryozems under Cover of Pine Plantations on Technogenic Residual Rocks of Kuzbass
The article studies the edificatory role of pine growing on the technogenic landscapes of the Kuznetsk coal basin and considers the influence of plantations of Scots pine (Pinus sylvestris L.) with different crown densit...
SOLVING THE PROBLEM OF REDUCING THE INFLUENCE OF LATERAL FORCE ON THE SAW BLADE STABILITY
The accuracy of the thickness of lumber is one of the most important indicators of sawing. It is inextricably linked with saw stabilization in the plane of the greatest stiffness. The aim of the study is to eliminate the...
Influence of Drying Temperature on Paper Properties Made of Sulfate-Bleached Softwood and Hardwood Pulps
Most paper mills in the Russian Federation consume around 40 % more electrical power than they actually require. The reasons are a low level of technical, scientific, and proficient assistance. Moreover, the produced goo...