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Purpose. Study of physicochemical properties, chemical nature, and interaction with collagen of new fatliquoring preparations of various origins to identify among them effective reagents for resource-saving technologies focused on the production of leather products with predictable properties to reducing the harmful load on the environment. Methodology. To determine the basic physicochemical properties and chemical nature of fats, traditional and modern physicochemical methods of analysis (titrimetric, viscometric, infrared spectroscopy) were used, as well as visual assessment. Result. The paper presents the results of determining the chemical nature and physicochemical properties of new fatliquoring preparations - industrial products of natural and synthetic origin: Synthol EW321, synthesized based on emulsified synthetic fats; Synthol MC derived from phosphated synthetic fats; Sulphirol C, based on sulfitated fish oil, is resistant to electrolytes; semi-synthetic composition CMX-473, obtained on the basis of sulfonated and sulfated fats; synthetic electrolyte-resistant composition CMX-470, obtained on the basis of sodium salts of alkyl succinic acid and synthetic fats. IR-spectroscopic studies of the fibrous collagen preparation treated with these fatliquoring preparations were carried out. The nature and change in the optical density of the absorption bands of the functional groups of the protein depending on the type of fat used is determined. It was found that the studied reagents interact mainly with nitrogencontaining and hydroxyl groups of collagen. Scientific novelty. Peculiarities of interaction in the “collagen - chemical reagent” system in the presence of fatliquoring preparations of various origin intended for processing the leather are investigated. Practical significance. The results of the work will contribute to the expansion of the assortment and the justified use of effective chemical reagents in innovative technologies for the production of leather. [ABSTRACT FROM AUTHOR]

Purpose. The purification of tanneries wastewater from toxic chromium compounds through the use of collagen-containing materials, produced from untanned wastes. Methodology. With the help of single-step method of static sorption we have studied the conditions and kinetics of chromium absorption from the model and waste tanning solutions. Findings. The degree of purification of the tanning solution used depends on the characteristics of the sorbents, their consumption and contact time of the phases. Originality. Since collagen-containing materials are obtained by the new technology, their sorption capacity relatively to chromium compounds has been studied for the first time. Practical value. The proposed method of wastewater sorption expands the range of used sorbents, allows you to use tannery wastes as a sorbent; 80-90% purifying from toxic chromium compounds. [ABSTRACT FROM AUTHOR]