Abstract The papers analyzed here were presented in the reposts of leading scientists in the processes and apparatuses of chemical technology and published in the Proceedings of the International Scientific and Technical Symposium “Improving the Energy and Recourse Efficiency and Environmental Safety of Processes and Apparatuses in the Chemical Industry and Allied Branches,” which was dedicated to

Abstract The paper presents a study of the process of the isolation of styrene-butadiene rubber from latex with the method of mathematical planning for a full factorial experiment (23). Regression equations that describe the effect of coagulant consumption, as well as the intensity and duration of magnetic field exposure on the process of obtaining rubber from latex, have been obtained. The physical

Abstract A combination of variational and empirical methods to determine the porosity is used to give a theoretical explanation of the power-law dependence of the dimensionless velocity of the constrained motion of particles during sedimentation.

Abstract Estimates are given of the stability of stationary states of a process of microbiological synthesis with the use of mathematical models of kinetics based on an unstructured approach. The object of research is a continuous biotechnological process, in which, in addition to biomass, the target product is obtained. The stability was assessed with the Hurwitz matrix. The process uses a component

Abstract The Henry constants upon the adsorption of inert gases with a natural isotopic composition (argon, krypton, and xenon) on activated carbon of the AG-3, VSK-5, SKT-3, and NWC 12x40 brands in a temperature range of 15–80°C are determined. A positive correlation of the Henry constants with the specific surface and micropore volume and surface normalized to the unit volume of the solid phase is

Abstract Decomposition NLP/LP/NLP methods are considered for the automated process design of the economically optimal distributed heat exchange networks between process streams using the assignment problem. The principle of fixation of intermediate variables and issues of the design of the superstructures of a heat exchange network and their decomposition are discussed. Methods to reduce the computational

Abstract New methods for extracting cobalt and zinc ions from sulfuric acid solutions, of silver and lead ions from nitric acid solutions, and of copper ions from hydrochloric acid solutions with liquid membranes based on di(2-ethylhexyl)phosphoric acid under conditions of galvanostatic electrodialysis with cathodic electrodeposition of metals are presented. Almost complete (93–100%) extraction from

Abstract The results of an analysis of mathematical models for a continuous fermentation process for lactic acid production have been presented. Mathematical models are represented by equations with the kinetics of the formation of lactic acid for strains of the following types: strains that consume only the main substrate (most frequently, glucose) and do not form by-products; strains that form by-products;

Abstract Taylor–Couette flow between independently rotating cylinders with a relatively small aspect ratio Γ = 2.4 has been investigated numerically. The Navier–Stokes equations with the uncoupled convection-diffusion-reaction equation are solved using a spectral development in one direction combined together with a finite element discretization in the two remaining directions. The study includes the

Abstract A method is described to solve the inverse problem of chemical kinetics (estimation of the rate constants for elementary steps of chemical reactions) from the data of nonstationary experiments in an open isothermal plug-flow reactor without using optimization algorithms. This method is used to determine the rate constants for elementary steps and the intervals of their values for reactions

Abstract The importance of aqueous two-phase systems has been increased recently as a method with greater performance capability in separation and purification of biological products along with economic and operational advantages compared to the conventional methods. However, the thermodynamic modeling of some of applicable aqueous two-phase systems like tetrahydrofuran + polyols has not yet developed

Abstract A method is proposed and multifactorial experiments are carried out to determine the effectiveness of various compositions of chemical additives for intensifying the processes of phytoextraction of mercury and other heavy metals from soils. White creeping clover (lat. Trifolium repens L.) is used as the object of experiment. As a result of a systematic analysis of the results of experiments

Abstract The problem of tritiated wastewater treatment is a pressing challenge in many countries. The principal man-made sources of tritium are nowadays represented by nuclear reactors of different applications, as well as plants for processing spent nuclear fuel. This article presents a review of literature data dedicated to the problems of formation of tritium in nuclear energy installations of various

Abstract The kinetics of sorption and regeneration from industrial nitric acid–phosphoric acid solutions with the use of ion-exchange resins like KU-2 has been studied for both individual rare-earth elements (REEs) and their mixtures with the measurement of sorption and regeneration isotherms. The high rate of the mentioned processes enables the use of these resins in pulsed columns with a fluidized

Abstract This review is devoted to describing the main synthesis methods, the properties of MgO nanoparticles, and their areas of application, such as the creation of coatings for transformer and other types of steels, coatings on glass to control the energy of transmitted solar radiation, the creation of transparent and translucent one-component ceramics, the creation of multicomponent ceramic compositions

Abstract The results of an analysis for ginsenosides in the Multiphytoadaptogene (MPA) phytoadaptogene composition with antitumor properties by high-performance liquid chromatography with tandem mass spectrometry (HPLC-MS/MS) are presented. Ginsenosides are identified with the use of commercial standards of ginsenosides and some literature data. Ginsenosides Rb1, Rb2, Rc, Rd, Rg1, Rg2, Re, Rf, and

Abstract An improved approach to determining the kinetic characteristics of electrochemical pressure-driven membrane separation of solutions has been proposed. It is based on the Spiegler friction theory and takes into account the combination of the effects of chemical and electrochemical potentials. The numerical values of the coefficients of friction fωm, f+m, and f+ω in the solvent–membrane, solute

Abstract The efficiency of polyethylene glycol methyl ether 350 (PEG ME-350) in the process of extracting thiophene from model motor fuel has been studied experimentally. The influence of the contact time of the phases, the composition of the extractant, the initial concentration of thiophene, and the volume ratio of the extractant and model fuel on the extraction of thiophene has been investigated

Abstract The possibility of preparing a variety of fertilizers from Lao Cai apatite raw material with various contents of a water-soluble form of phosphorus at a nearly identical fraction of total and assimilable phosphates is shown.

Abstract The effect of climatic factors is studied on the properties of basalt and glass textolite prepared by the infusion method by the sequential laying of the reinforcing material on the mold, impregnation with a three-component epoxy binder consisting of ED-22 epoxy resin, Iso-MTHFA (isomethyltetrahydrophthalic anhydride) hardener, Agidol 53, an accelerator for the hardening of epoxy compositions

Abstract The modification of functional materials with rare-earth elements (REEs) for different purposes by the low-temperature extraction–pyrolysis method has been carried out. Luminophors and magnetic and biomedical materials have been synthesized, and their compositions and properties have been studied. It has been established that the introduction of modifying additives (REE ions) could significantly

Abstract Using chemical and XRD phase analysis, along with electron microscopy, the hydrolytic processing of metallic bismuth into high-purity citrate has been studied. A comparison of two synthesis methods is carried out for bismuth(III) citrate of BiC6H5O7 composition by precipitation from technological nitric acid solutions by the addition of a citric acid solution and by the reactions of solid

Abstract The possibility of removing U(VI) from aqueous solutions using layered double hydroxides of Mg and Al, which contain β-cyclodextrin (LDH-Mg-Al-CD), has been studied. It is found that LDH-Mg-Al-CD does not sorb [UO2(CO3)3]–4 (the sorption degree does not exceed 0.001% after 24-h contact between the solid and liquid phases). At the same time, it is established that the application of LDH-Mg-Al-CD