卷 8, 编号 1 (2025)

pyrolysis of low-density polyethylene (LDPE) waste is considered as a highly efficient and promising recycling method. The aim of this work is to investigate the pyrolysis kinetics using three model-free methods (Friedman, Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS)) and two model-fitting methods (Arrhenius and Coates-Redfern). Thermogravimetric (TGA) and differential thermogravimetric (DTG) thermograms at 5, 10, 20 and 40 K min−1 showed a linear curve, which implies the first-order reactions. The kinetic parameter values (E_A and A) of LDPE were calculated at different conversions by three model-free methods, and the average values of activation energies obtained were in good agreement and ranged from 190.23 to 191.89 kJ/mol. These kinetic parameters were additionally calculated at different heating rates using the Arrhenius and Coates-Redfern methods.

the development of effective and effective formulations of detergents has been an urgent task for a long period. The washing composition includes a large number of various raw materials components that perform certain functions. Today, the market of chemical raw materials has a wide range, which makes it possible to select the necessary components, depending on the required properties and characteristics of the products. Surfactants, which no composition can do without, as well as complexing additives, which not only serve to bind hardness ions during the cleaning process, but also enhance the washing ability of the entire system, are important and mandatory elements of the washing system. Currently, the most popular chelating agents are sodium tripolyphosphate, ethylenediaminetetraacetic acid, hydroxyethylenediphosphonic acid, etc. However, based on recent scientific research, it can be concluded that trip. Taking into account this information, such complexes as oxy-ethylene diphosphonic and ethylenediaminetetraacetic acids are beginning to gain great popularity, since they have the necessary set of properties and characteristics for use in detergent formulations, are affordable and simple in the process of technological application. The article describes the influence of the nature of the complexing components that make up detergents on enhancing the cleansing effect and increasing the effectiveness of compositions. For this study, the sedimentation volume method was chosen, which made it possible to evaluate the hydrophilizing effect on the carbon surface in systems with various types of complexing agents. Based on the results obtained, conclusions were drawn about the most effective and suitable chelating agent for this washing system, and the most optimal concentration of the complexing agent was selected.