Theoretical Foundations of Chemical Engineering
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Peculiarities of unsteady mass transfer in flat channels with liquid and gel
Theoretical Foundations of Chemical Engineering - Tập 49 - Trang 798-807 - 2015
The rate of the unsteady mass-transfer process in horizontal flat channels filled with viscous liquid (water) and in channels filled with gel has been measured experimentally. It has been established that the rate of propagation of a substance through a channel under the unsteady one-dimensional mass transfer conditions depends on its width and exceeds the value corresponding to the rate of diffus...... hiện toàn bộ
Mass Transfer in Irrigated Plane-Parallel Channels at Uniflow Laminar Motion of Liquid and Gas
Theoretical Foundations of Chemical Engineering - Tập 53 - Trang 984-995 - 2019
Hydrodynamics and mass transfer in regular film apparatuses containing flat irrigated channels with a laminar flow of gas and liquid as the principal element are studied. The problem is solved by the approximate method, which makes it possible to drastically decrease the amount of the required calculations. It is proven that it is sufficient to determine the dimensionless flux as the function of d...... hiện toàn bộ
Synthesis of polysiloxaneurethane polymers by the aromatic isocyanate-activated opening of the octamethyltetrasiloxane ring via an anionic mechanism
Theoretical Foundations of Chemical Engineering - Tập 44 - Trang 150-161 - 2010
Here, we present the results of the study of the interaction in the octamethylcyclotetrasiloxane-aromatic isocyanate-open coupling analogues system of crown ethers containing terminal hydroxyl and potassium alkoxide groups. It was found that the involvement of the organosiloxane cycle in the polymerization process precedes the opening of the isocyanate groups on the carbonyl component. It is shown...... hiện toàn bộ
Paraffin wax emulsions stabilized with polymers, surfactants, and nanoparticles
Theoretical Foundations of Chemical Engineering - Tập 51 - Trang 125-132 - 2017
Problems preparing paraffin wax emulsions stabilized by different types of emulsifiers have been discussed. The effect of the preparation conditions and stabilizers, such as polyethylene glycol and cetyl/oleyl alcohol ether (Eumulgin O10), polyvinyl alcohol, and SiO2@Al2O3 nanoparticles (20 nm in diameter) on the dispersion of paraffin wax emulsions has been demonstrated. It has been noted that, i...... hiện toàn bộ
New Class of Exact Solutions of Navier–Stokes Equations with Exponential Dependence of Velocity on Two Spatial Coordinates
Theoretical Foundations of Chemical Engineering - Tập 53 - Trang 107-114 - 2019
A new class of exact solutions of nonlinear and linearized Navier–Stokes equations has been proposed, which generalize the well-known family of exact solutions in which the velocity is linear in some coordinates. The case of the quadratic dependence of the velocities on two horizontal (longitudinal) coordinates with coefficients that are the functions of the vertical (transverse) coordinate and ti...... hiện toàn bộ
Tổng hợp huyền phù nanocristalline anatase từ dung dịch nước của sulfat titanyl phục vụ cho các ứng dụng quang xúc tác Dịch bởi AI
Theoretical Foundations of Chemical Engineering - Tập 43 - Trang 713-718 - 2009
Huyền phù nano oxit titan được chế tạo bằng cách thủy phân sulfat titanyl dưới điều kiện thủy nhiệt. Ảnh hưởng của các tham số tổng hợp lên vi hình thái và các đặc tính chức năng của TiO2 thu được đã được nghiên cứu. Các điều kiện tối ưu cho việc tổng hợp các huyền phù với hoạt tính quang xúc tác tối đa đã được xác định.
#tổng hợp #huyền phù nano #oxit titan #sulfat titanyl #quang xúc tác
Physicochemical analysis as the methodological basis of mineral processing and inorganic synthesis
Theoretical Foundations of Chemical Engineering - - 2012
Based on N.S. Kurnakov’s composition-property conception of physicochemical analysis and on studies by I.V. Tananaev, V.B. Lazarev, A.D. Verkhoturov, and other scientists, we suggest the raw material-technology-composition-structure-particle size-property-application seven-term formula as the methodological basis for mineral processing and for the synthesis of inorganic materials for various purpo...... hiện toàn bộ
Applicability tests for empirical formulas: Analysis of turbulent flows and general comments
Theoretical Foundations of Chemical Engineering - Tập 43 - Trang 119-128 - 2009
Direct and differential-invariant methods for processing experimental data are used to analyze Nikuradse’s results for a turbulent flow of a viscous liquid in round smooth tubes for various Reynolds numbers. It is found that direct testing ratios do not make it possible to draw a correct inference about the applicability of the Prandtl logarithmic profile. The explanation of this paradoxical resul...... hiện toàn bộ
Application of a contact vortex condenser to absorb methanol from a contact gas
Theoretical Foundations of Chemical Engineering - Tập 50 - Trang 194-200 - 2016
The absorption of methanol from a contact gas in the production of technical formalin has been considered. The model of a conventional process flow sheet for absorbing methanol from a contact gas has been constructed using computer-aided modeling. The empirical coefficients used in the NRTL and Lee–Kesler models were determined. The amount of methanol in the absorption gases utilized by combustion...... hiện toàn bộ
Calculation of fine dust collection in a foam bubbler using the condensation effect
Theoretical Foundations of Chemical Engineering - Tập 40 - Trang 379-386 - 2006
A theory of a condensation method of fine dust collection in a foam bubbler is proposed. It is demonstrated that diffusion plays a decisive role owing to water vapor condensation on the inner surface of bubbles forming on holes in a gas-distributing grid. A calculation formula for evaluating the condensation effect is obtained, which satisfactorily fits available experimental data.
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