Problems of Chemistry and Chemical Technology

The mass transfer in the gas-liquid system at sulfating of organic raw material

This study considers using of pellicle reactors to be one of the main directions of sulfating technology. In this paper, we address the problem of determining the mass transfer coefficient dependences from temperature, irrigation density, and air-gas stream speed. In addition, we illustrate the research results of physical and chemical properties of sulfated products.

Optimization of electrodes polarization component for supercapacitors

The paper considers the dependence of supercapacitor inner resistance on thickness of electrodes polarization component in order to optimize the microporous structure of the activated carbon material, utilized for electrode production, with the structure of transport channels inside electrodes. Employing the tier model, we describe electrochemical processes, occurring in porous electrodes.

Sorption-reducing treatment of groundwater from uranium compounds

The paper considers the processes of sorptionreducing treatment of water polluted with uranium compounds by various active agents. Our research subject is groundwater selected from the hole near the tailing dump of waste of uranium ore processing from the East ore-dressing and processing enterprise situated near Zhovti Vody. To that end, we utilize the activated sludge of Bortnytska aeration station and Fe0 iron powder as active agents.

The influence of auxiliary electrode polarization on transient processes in amperometric gas sensors

This study proves that the mode of transient performance in amperometric sensor can clearly indicate the excessive polarization of auxiliary electrode as a root cause of unstable signal or long transition period. These findings allow determining a dramatic decrease in the contact area of consumables auxiliary electrode (potential determining material) with its conductive skeleton that causes the sharp rise in polarization

Study of the effect of carbon nanotubes on the processes of ionic association in liquid polymer electrolyte polyethyleneglycol —LiClO4

By using Fuoss–Kraus theory and the conductivity data, we study the ion association in polymer electrolyte based on polyethyleneglycol, lithium perchlorate and carbon nanotubes. We also determine that the filler addition decreases the aggregation in the polymer electrolyte, which leads to the increase in the number of free ions, as well as to the conductivity growth..

Obtaining of Cellulose from Rape Straw by the Oxide-Organosolv Method of Delignification

The paper studies the cooking process of cellulose from rape straw by the oxide-organosolv method of delignification. We investigate the influence of the basic technological parameters of the process (duration, temperature, liquor/raw material ratio, concentration of peracetic acid and hydrogen peroxide, type of catalyst) on the pulp yield and properties of pulp. Crucially, we determine that application of catalysts in the process of rape straw cooking by the liquors of peracetic acid allows reducing lignin content in the pulp.

Application of Magnesium Protection from Corrosion in the Hot Water Heating Systems Using the Contact Water Heaters in the City of Alexandria

In this paper, we consider the corrosion issues of hot water heating systems that use contact water heaters. We show that the lack of corrosion protection methods after one-year service. It is caused by the increase of corrosivity of the environment due to saturation of the water by carbon dioxide. On the experimental side, we conduct the industrial investigations to check efficiency of the magnesium method of corrosion protection in such systems on the sample of boiler installations of the city of Alexandria.

Technical Detergents for Cleaning Heliosystem Elements

This study demonstrates the possibility of introducing CF-10 surfactant into the technical detergent. We do the research into CF-10 - Ferrum (III) as a pollution ingredient interaction that can cause re-deposition on the surface. Finally, we determine the corrosion activity and foaming ability of CF-10

Application of pervaporation technique to the production of mixed fuel

The paper presents the flow charts, design of the membrane apparatus and provide recommendations for the industrial application of pervaporation to the production of mixed fuel, in particular to obtaining light petroleum fractions and anhydrous ethanol

Study of hard water pre-treatment methods for membrane purification

This paper describes hard water pre-treatment and mineralization for subsequent water conditioning, using membrane methods. Furthermore, we show that application of ion exchange water softening at its preliminary preparation stage is appropriate on the condition that water hardness is less than 20meq/dm3. Through experiments performed, we prove that the antiscalants usage is efficient for water pre-treatment with a high level of noncarbonated hardness.