Synthesis of Composite Corrosion Inhibitor Based on Maleic Anhydride, Monoethanolamine and Phosphate Acid

In this article, the optimum conditions for the synthesis of corrosion inhibitors based on maleic anhydride, monoethanolamine, and phosphoric acid and the inhibitory efficiency of the obtained inhibitor are studied. In this case, the mole ratio of the starting materials was 2 moles (122 g) of monoethanolamine: 1 mole (98 g) of maleic anhydride: 1 mole (98 g) of phosphoric acid, and the yield of the reaction was 92.5%. The IR spectra of the structure of this obtained inhibitor were studied. The inhibition efficiency of this corrosion inhibitor was measured by the gravimetric method according to GOST 9.506-87 in 1M HCl + 200 mg/l NaCl and 0.5 HCl + 200 mg/l NaCl environments. The inhibition efficiency was 93.15% and 92.86%, respectively. reached According to the results of the electrochemical research, the inhibition efficiency was 91.5%. In addition, Langmuir, Frumkin, and Tyomkin isotherms of the inhibition mechanism of the inhibitor were studied. The effect of the inhibitor on the steel surface was studied with a scanning electron microscope

Parameters of mini straw grader

The purpose study is to substantiate the parameters of a mini straw shredder. The diagram rotor of a cone-shaped shredder is given. The basic laws of theoretical mechanics and mathematical analysis were used in theoretical studies to substantiate the parameters mini shredder. Single-and multifactorial experiments were carried out when determining the optimal parameters mini shredder. In theoretical studies, analytical links were obtained to determine the length of the mini straw grader knife, the slope angle, its base, and the force required to cut the straw. According to the results of studies, the degree of grinding salmon and energy consumption depended mainly on the length blade, the mass balancing truck, and the slope angle blade. It is established that to ensure the required fullness of grinding with minimal energy consumption, the length knife should be within 87.66-88.38 mm, the weight of the balancing weight should be 0.0368-0.0536 kg, and the angle of inclination of the knife 2848º

Study of the hygrometric condition of cement stone and concrete

Cement systems are thermodynamically non-equilibrium, non-linear systems. Since it is far from equilibrium, it must be characterised by structure formation processes. Here it is necessary to consider the definition of ‘structure formation’. This term is used in two meanings. The first is generally accepted in concrete science -the formation of mechanical bonds between the dispersed particles of a solidifying system as a result of ongoing chemical and physicochemical processes, culminating in the formation of a solid body -the cement stone and concrete. The second meaning of the term describes the emergence of dissipative structures, i.e. the destruction of the initial homogeneity of the system due to the emergence of streams, concentration gradients, chemical waves, etc. By measuring the parameters of the resulting dissipative structures of different formation methods, it is possible to assess the degree of disequilibrium in the solidifying system and hence the directed methods of structure formation and structure optimisation. It should also be noted that a non-linear, non-equilibrium hydration process leading to a concentration potential difference proceeds with equal probability in all directions. Applying a gradient of a high-intensity physical field to the disperse system, one should expect a synchronisation of the fluctuations of the concentration potential of local areas of the disperse system, which will result in a sharp increase of the physical and mechanical properties of the hydration products of the binder and of the concrete in general

Parameters of mini straw grader

The purpose study is to substantiate the parameters of a mini straw shredder. The diagram rotor of a cone-shaped shredder is given. The basic laws of theoretical mechanics and mathematical analysis were used in theoretical studies to substantiate the parameters mini shredder. Single-and multifactorial experiments were carried out when determining the optimal parameters mini shredder. In theoretical studies, analytical links were obtained to determine the length of the mini straw grader knife, the slope angle, its base, and the force required to cut the straw. According to the results of studies, the degree of grinding salmon and energy consumption depended mainly on the length blade, the mass balancing truck, and the slope angle blade. It is established that to ensure the required fullness of grinding with minimal energy consumption, the length knife should be within 87.66-88.38 mm, the weight of the balancing weight should be 0.0368-0.0536 kg, and the angle of inclination of the knife 2848º

Use Of Hydrocarbon Refrigerating Agents In Freon-12 Replacements

The article is devoted to the use of ozone-friendly refrigerants (ammonia) in the ventilation of large objects

Study of the hygrometric condition of cement stone and concrete

Cement systems are thermodynamically non-equilibrium, non-linear systems. Since it is far from equilibrium, it must be characterised by structure formation processes. Here it is necessary to consider the definition of ‘structure formation’. This term is used in two meanings. The first is generally accepted in concrete science -the formation of mechanical bonds between the dispersed particles of a solidifying system as a result of ongoing chemical and physicochemical processes, culminating in the formation of a solid body -the cement stone and concrete. The second meaning of the term describes the emergence of dissipative structures, i.e. the destruction of the initial homogeneity of the system due to the emergence of streams, concentration gradients, chemical waves, etc. By measuring the parameters of the resulting dissipative structures of different formation methods, it is possible to assess the degree of disequilibrium in the solidifying system and hence the directed methods of structure formation and structure optimisation. It should also be noted that a non-linear, non-equilibrium hydration process leading to a concentration potential difference proceeds with equal probability in all directions. Applying a gradient of a high-intensity physical field to the disperse system, one should expect a synchronisation of the fluctuations of the concentration potential of local areas of the disperse system, which will result in a sharp increase of the physical and mechanical properties of the hydration products of the binder and of the concrete in general

Structure formation of hyper-compacted and modified concrete

Production of axisymmetric products -pressure and non-pressure pipes, rings, wells, bridges and drainage elements represents one of the main branches of construction industry in water and wastewater industry of Uzbekistan and Central Asian republics. However, positive tendencies of its development are only emerging and still do not meet the potential of progressive, competitive and economical modern technology, capable of providing significant shifts in reduction of resource intensity of new products, expansion of raw material base of construction industry and involvement of technogenic products into its balance, as well as solution of important economic and environmental problems. Prospects for further development of high-efficiency tubular goods production and scientific and technological progress of their production are largely determined by the importance of regularities and methods of controlling technological processes of structure formation with regard to given high level of product quality and criteria of resource intensity of production. In this regard, the analysis of general regularities of material structure formation in the complex process of hypercompaction and cementations modification in axisymmetric concrete is of primary importance