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Background. Alkyd resins are used in various industries. Useful properties of products are determined by the composition and structure of alkyd resins. In this regard, the study of the conditions for the synthesis of alkyd resins from recycled polyethylene terephthalate (HPET) and their alcoholysis products is relevant. Purpose: To study the conditions for the synthesis of alkyd resins based on VPET and their physicochemical and technological properties. Methodology: Acid number was determined according to GOST 25210-82; viscosity - GOST 8420-74, drying time - GOST 19007-73, dry residue - GOST 31939-2012 (ISO 3251:2008), iodometric scale - GOST 19266-79, hardness - GOST 5233-89, bending strength - GOST R 52740-2007. Originality: The possibility of synthesizing modified alkyd resins based on VPET, which are not inferior to industrial analogues in terms of physicochemical and technological properties, is shown. Findings: Conditions for the synthesis of modified alkyd resins based on VPET were revealed. It is shown that with an increase in the amount of VPET to 10%, the incompatibility of the PF-060 resin with VPET is observed. It has been determined that with an increase in the amount of bishydroxyethylene terephthalate (BGTP), the viscosity and number average molecular weight decrease. It was found that an increase in the amount of HPET in the formulation above the optimum leads to partial turbidity of the reaction mass. [ABSTRACT FROM AUTHOR]

Backround. Prerequisites for the problem. The trend towards the consumption of fuel from oil and gas production is growing every year, as is the production of a by-product, sulfur. Sulfur cements are of interest. The development of modified sulfur concrete and products based on them is underway, their environmental safety is important. Purpose: development of resource-saving technologies for obtaining modified sulfur based on a byproduct of petrochemicals using a modifying additive - calcium diamidophosphate. Methodology. Methods of organic synthesis, deformation-strength and thermomechanical analysis, IR spectroscopy, X-ray diffraction were used. Originality. The optimal conditions for the synthesis and modification of sulfur in the composition of the by-product, calcium diamidophosphate, have been determined. Findings. In the temperature range 150-230 ° C, DAPA dehydration is possible in the form of low molecular weight compounds with sulfur. The conclusion is made about the possibility of using DAFK as a complex modifying additive in the production of sulfur concrete. [ABSTRACT FROM AUTHOR]

Вackground. Currently, industrial enterprises of the republic accumulate a huge amount of waste water, but their purification and return to the system is urgent. However, cleaning them is multi-step and time consuming. Purpose. Assessment of the possibility of treating waste water from metallurgy with waste from the production of sucrose. Methodology. Comparative study of colloidal-chemical parameters of the obtained samples of thermolysis defecate using standard methods of analysis. Originality. It has been established that the main pollutants are substances entering wastewater from metal processing operations, as well as heavy metal ions. The investigated effluents had high concentrations of dissolved salts and suspended solids. Laboratory tests of experimental samples of thermally processed defect in waste water have been carried out. It has been established that the thermal processed defecate is effective for the purification of wastewater from heavy metal ions. The consumption of thermally modified defecate was 2%, while the degree of wastewater treatment from heavy metals was at least 90% for Be, Al, Mn, As, Mo, U, Zh, Th ions, 70% for Ni, Se, Sr, Pb ions, 40% for ions Cu, Cr, Co. Findings.It was established that thermolysis of defecate up to 650 °С increases its adsorption properties, due to which it became possible to return valuable components from waste water. [ABSTRACT FROM AUTHOR]

Background. As you know, reagent methods for removing heavy metal ions from wastewater lead to the formation of difficult to dispose of sludge. When solving these problems, the use of natural sorbent minerals prevents the formation of additional sludge and is economically profitable as well as environmentally sound. Purification of wastewater from ions of iron, manganese, copper and cadmium, using natural minerals, gives good results, and to increase the efficiency of the process, enrichment and activation of natural sorbent minerals will be required. Purpose is the enrichment and activation of natural glauconite mineral for purification and softening of wastewater containing some heavy metal ions by the sorption method. Methodology. Glauconite of the Parkent deposit was used as an object of research, which were enriched and modified. For enrichment, gravity methods and magnetic separation were used. During the experiments, model solutions containing ions of some heavy metals were also used. Originality. An increase in the sorption capacity by 1.7-2.0 times of a glauconite sample processed for 2 hours in 20% HCl and then for 1 hour in an 8% NaCl solution was determined. Findings. As a result of the research, a method for modifying Parkentglauconite has been developed. The technological conditions for enrichment and granulation of glauconite mineral without additional binders have been determined. A method of thermal activation and sequential chemical treatment in the acid-salt sequence have been developed, and the optimal concentrations of the components have been determined. [ABSTRACT FROM AUTHOR]

Background. As you know, methods for removing metal compounds from wastewater and spent technological solutions by reagent methods lead to the formation of difficult to utilize sludge in large volumes. When solving these problems, the use of electrochemical cleaning methods prevents the formation of additional slimes, which is economically viable and environmentally sound. Purpose of this work is to increase the efficiency of electrochemical treatment of industrialwastewater contaminated with chromium (III) and chromium (VI) ions. Methodology. As an object of study, the spent solution and wastewater of the galvanic department of «MFS» OOS and modified bentonite were used for their preliminary purification before the electrolysis process. To determine the concentrations of chromium ions, instrumental methods of chemical analysis were used (KFK-3 spectrophotometer). Originality. At the expense of to the preliminary purification of chromate-containing wastewater from calcium and magnesium ions with modified bentonite, the current efficiency of the electrochemical process increased to 24.5%. Findings. A method for modifying Navbahor bentonite was developed The optimal conditions for increasing the yield of chrome at the electrochemical treatment of chromate-containing wastewater were determined by using modified bentonite for preliminary wastewater treatment. [ABSTRACT FROM AUTHOR]