Synthesis, Surface Active and Thermodynamic Parameters of Novel Quaternary Ammonium Salts

Reactions of octanol, nonanol, decanol, and dodecanol with epichlorohydrin were carried out in the presence of sodium hydroxide as a catalyst. The synthesized non-ionic surfactants were modified with triethanolamine. Surface activity at the water-air interface and electrical conductivity of the resulting surfactants at 10, 20, 30 and 40?°C were determined and thermodynamic parameters of micellization and adsorption were calculated. It was established that the synthesized quaternary ammonium salts have the ability to localize thin crude oil films on the water surface formed due to spill.     

Synthesis and Characteristics of Dodecyl Isopropylolamine and Derived Surfactants

Dodecyl isopropylolamine has been synthesized on the basis of dodecylamine and propylene oxide. The structure of dodecyl isopropanolamine has been determined by X‐ray diffraction, elemental analysis, IR‐ and NMR‐spectroscopic methods. Ionic surfactants have been synthesized by interaction of dodecyl isopropylolamine with various acids (HCl, HBr, acetic and propionic) and alkyl halides (methyl iodide, ethyl bromide and n‐propyl bromide). Colloidal‐chemical parameters, petroleum‐collecting and petroleum dispersing capacities of the synthesized cationic surfactants have been studied.     

Identification of the Parameters of a Discrete Gas-Lift Process

Journal of Computer and Systems Sciences International - A time-averaged mathematical model of a discrete gas-lift process is considered. At the first iteration, an analytical expression for the...     

Production of diesel fractions by catalytic cracking of vacuum gas oil and its mixture with cottonseed oil under the influence of a magnetic field

The influence of the 0.4?T magnetic field on catalytic cracking of the vacuum gasoil and its mixture with 5% cottonseed oil was evaluated. Magnetic field intensity excites aromatic resins existing in the vacuum gasoil and causes more effective cracking. Catalytic cracking was conducted using commercial X-zeolite fluid catalytic cracking catalyst and reaction products, especially gasoline and diesel fractions were analyzed in detail. Magnetic field increased the yield of the diesel fraction from 7 to 33% and enriched its composition with aromatic hydrocarbons while opposite effect was observed in gasoline. Cracking mechanisms in formation of gasoline and diesel range hydrocarbons were briefly discussed.     

Development of Technologies for Reducing the Error of Traditional Algorithms of Correlation Analysis of Noisy Signals

Measurement Techniques - The factors that have an effect on estimation errors of the correlation functions of noisy signals in using traditional algorithms to evaluate them are analyzed. It is...     

Application of TOPSIS Method in Support of Decisions Made in Staff Management Issues

Evaluation model was proposed which refers to fuzzy formalism of the personnel management issues taking account their specific characteristics. Application of TOPSIS （technique for order Performance by similarity to ideal solution） method for evaluation and regulation of alternatives based on hierarchically structured criteria of qualitative character by multiple experts to intellectually support decisions made in staff management issues is reviewed in the article. Candidate selection experiment based on criteria system formed using TOPSIS method for evaluation of candidates during solution of hiring problems reviewed and obtained results were compared with results obtained using Matlab program package.     

Structure and Optical Properties of Chalcogenide Glassy As–Ge–Te Semiconductor

Semiconductors - The structure and optical properties of a chalcogenide glassy As–Ge–Te semiconductor film are studied by X-ray diffraction analysis, Raman spectroscopy, and optical...     

Structure and Optical Properties of Chalcogenide Glassy Semiconductors of the As–Ge–Se System

Semiconductors - The types of structural elements and chemical bonds forming an amorphous matrix of chalcogenide glassy semiconductors of the As–Ge–Se system and changes occurring in...