scholarly journals FORMATION OF AZEOTROPIC MIXTURES OF N-METHYLPYRROLIDONE WITH HYDROCARBONS

2021 ◽  
Vol 56 ◽  
pp. 12-16
Author(s):  
Alexey V. Kameshkov ◽  
◽  
Alexander A. Gaile ◽  
Vasily N. Klementyev ◽  
Sofya D. Usanova ◽  
...  
Keyword(s):  
Activity Coefficients ◽  
Boiling Point ◽  
Binary Systems ◽  
Raw Materials ◽  
Technological Scheme ◽  
Saturated Hydrocarbons ◽  
Azeotropic Mixtures ◽  
Regeneration Unit

Using the limiting activity coefficients of the components of binary systems of N-methylpyrrolidone with n-alkanes and the conditions for the formation of azeotropes, it is found that N-methylpyrrolidone forms azeotropic mixtures with n-alkanes С9 - С 15, with alkylbenzenes С 10 - С 12 and with naphthalene. The formation of azeotropes with saturated hydrocarbons with a boiling point of 230-270 ° C must be taken into account when developing a technological scheme for the N-methylpyrrolidone regeneration unit, and also not to use this extractant for extraction purification of raw materials with a boiling point below 230 ° C

scholarly journals Analysis of the criteria of efficiency of work of separators for the field of hydrocarbon raw

2019 ◽  
pp. 114-119
Author(s):  
Valeriy V. Piven ◽  
Vladislav S. Shchelkonogov
Keyword(s):  
Technological Process ◽  
Raw Materials ◽  
Comprehensive Assessment ◽  
Technological Scheme ◽  
Qualitative Composition ◽  
Separation Processes ◽  
Process Flow ◽  
Multi Stage ◽  
Flow Diagrams

Assessment of the quality of separation of hydrocarbon raw during its field preparation is necessary to determine the efficiency of the entire technological process of preparation. The absence of complex criteria for assessing the quality of separation for multi-stage processes does not allow one to obtain unambiguous solutions in justifying the process flow diagrams and equipment for separation. We have analyzed the typical technological scheme of separation of hydrocarbon raw materials and existing criteria for separation processes. It is proposed to use the criterion for a comprehensive assessment of the separation processes of hydrocarbon raw materials, allowing calculating the efficiency of the process, taking into account the possible production of intermediate fractions and their qualitative composition

INNOVATIVE DIRECTIONS OF DEVELOPMENT OF VINEGAR PRODUCTION IN THE REPUBLIC OF BELARUS

2020 ◽  
Vol 13 (4(50)) ◽  
pp. 52-60
Author(s):  
A. A. Pushkar ◽  
D. V. Khlimankov ◽  
V. I. Solovei ◽  
A. V. Rybak ◽  
J. N. Shcherbitskaya
Keyword(s):  
Research And Development ◽  
Ethyl Alcohol ◽  
Raw Materials ◽  
Technological Scheme ◽  
Development Work ◽  
Organoleptic Characteristics ◽  
The Creation ◽  
The Republic

he article presents the results of research and development work on the creation of technologies for the production of new types of vinegar based on starch-containing raw materials with original organoleptic characteristics. The introduction of this technology at the enterprise provides for the introduction of a new stage of the mechanical-enzymatic destruction of starch-containing raw materials with its biotransformation into ethyl alcohol into the current technological scheme of the enterprise.

Liquid-liquid equilibrium in the water-ethanol-toluene system. Correlation of equilibrium data

1989 ◽  
Vol 54 (3) ◽  
pp. 586-601 ◽  
Author(s):  
Josef P. Novák ◽  
Jaroslav Matouš ◽  
Květuše Říčná ◽  
Vladimír Kubíček
Keyword(s):  
Boiling Point ◽  
Binary Systems ◽  
Azeotropic Mixture ◽  
Liquid Equilibrium ◽  
Equilibrium Data ◽  
Ternary Parameters

Liquid-liquid equilibrium data in the water-ethanol-toluene system were correlated by the superposition of the Wilson and Redlich-Kister equations with a ternary term. The correlation of both homogeneous binary systems was taken from the literature. The ternary liquid-liquid equilibrium data were at all temperatures satisfactorily described on using only three ternary parameters determined from the equilibrium data at 50 °C. The parameters obtained by the correlation yield also a good estimate of boiling point and composition of homogeneous azeotropic mixture.

scholarly journals A new approach in topological descriptors usage. Iterated line graphs in the theoretical prediction of physico-chemical properties of saturated hydrocarbons

2019 ◽  
Keyword(s):  
Boiling Point ◽  
Molecular Graph ◽  
Chemical Properties ◽  
Topological Descriptors ◽  
Vaporization Enthalpy ◽  
Line Graphs ◽  
Regression Equations ◽  
Saturated Hydrocarbons ◽  
Program Complex ◽  
Physico Chemical

A new look on the problem of the molecular systems index description is presented. The capabilities of iterated line (edge) graphs in characterization of saturated hydrocarbons properties were investigated. It was demonstrated that single selected molecular (graph-theoretical (topological) or informational) descriptor calculated for the sequence of nested line graphs provides quite reliable progressive set of regression equations. Hence, the problem of descriptor set reduction is solved in the presented approach at list partially. Corresponding program complex (QUASAR) has been implemented with Python 3 program language. As the test example physico-chemical properties of octane isomers have been chosen. Among the properties under investigation there are boiling point, critical temperature, critical pressure, enthalpy of vaporization, enthalpy of formation, surface tension and viscosity. The corresponding rather simple linear regression equations which include one, two or three parameters correspondingly have been obtained. The predictive ability of the equations has been investigated using internal validation tests. The test by leave-one-out (LOO) validation and Y‑scrambling evaluate the obtained equations as adequate. For instance, for the regression model for boiling point the best equation characterizes by determination coefficients R2 = 0.943, with LOO procedure – Q2 = 0.918, while for the Y-scrambling test Q2y-scr<0.3 basically. It is shown that all the abovementioned molecular properties in iterated line graph approach can be effectively described by commonly used topological indices. Namely almost every randomly selected topological index can give adequate equation. Effectiveness is demonstrated on the example of Zagreb group indices. Also essential effectiveness and rather universal applicability of the so-called “forgotten” index (ZM3) was demonstrated.

scholarly journals Carbon Dioxide Recuperation Using a Ranque-Hilsch Vortex Tube for Refrigerated Food Processing

2021 ◽  
pp. 109-114
Author(s):  
Tamaz Isakadze ◽  
◽  
Givi Gugulashvili ◽  
Keyword(s):  
Carbon Dioxide ◽  
Technological Process ◽  
Food Processing ◽  
Boiling Point ◽  
Vortex Tube ◽  
Raw Materials ◽  
Food Products ◽  
Freezing Temperature ◽  
Point Of View ◽  
Refrigeration Machine

The disadvantage of the technological process of freezing food products using carbon dioxide is the irrational use of its waste vapors. From the authors’ point of view, it is desirable to use carbon dioxide not only directly on the line for freezing and cooling food raw materials. Cooling of carbon dioxide vapors after processing on freezing lines with further use for refrigeration looks promising, for example, for freezing food materials, for which the freezing temperature according to the technological instructions can be higher than the boiling point of carbon dioxide -78 ℃. An innovative refrigeration machine based on a Ranque-Hilsch vortex tube has been developed for cooling waste carbon dioxide for further use in the refrigeration processing of food products. It is based on carbon dioxide recovery technology.

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