kinetics

Thermodegradation Effects in Thick-film Elements Based on Spinel Ceramic of Cu- and Co-enriched Compositions

The modern state-of-the-art and perspectives to resolve the problem on negative temperature coefficient thermistor element for sensor electronics were analyzed. It was shown that thick-film technology in application to mixed transition-metal oximanganite ceramics is one of the most effective ways to achieve the final purpose — the elaboration of wide range of thermistors with high stability of their exploitation properties.

Biofuel characterization and pyrolysis kinetics of acacia mangium

The study seeks to proffer practical solutions to the sustainable waste management of Acacia mangium leaves (AML) and explore its solid biofuel (SBF) potential through thermochemical valorization. Consequently, the physicochemical, thermal and kinetic properties of AML were examined using elemental, proximate, bomb calorimetric, thermogravimetric (TG-DTG), and Kissinger kinetic analyses. The results revealed AML possesses high content of carbon, volatile matter, and fixed carbon but low moisture and ash content.

Кінетика фільтраційного сушіння амофосу

The paper is dedicated to theoretical and experimental investigation of the kinetics of ammophos filtration drying. On the basis of experimental investigations, the criterial dependencies for determination of heat-and-mass transfer are received and the analogy between external heat transfer and mass transfer is determined. Розглядаються теоретичні та експериментальні дослідження кінетики фільтра- ційного сушіння амофосу.

Кінетика фільтраційного сушіння фосфогіпсу

This  article  is  devoted  to  solving  problems  of  disposal  and  use  of phosphogypsum.  Chosen  as  the  most  optimal  and  economically  feasible  method  of drying  phosphogypsum,  namely  filtration  drying  method.  Experimental  study  on drying kinetics of phosphogypsum.  
Вирішенно  проблеми  утилізації  та  використання  фосфогіпсу.  Обрано найоптимальніший  та  економічно  обґрунтований метод  сушіння фосфогіпсу,  а сааме: фільтраційний метод сушіння. Проведені експериментальні дослідження з кінетики сушіння фосфогіпсу. 

Зменшення енергетичних затрат процесу сушіння у виробництві цукатів з груш

Досліджено зміни температурних режимів процесу сушіння у виробництві цукатів
з груш. Проведені експериментальні дослідження з теплообміну та кінетики сушіння
цукатів з груш за різної температури. Експериментально підтверджено доцільність
проведення процесу сушіння за температур цукатів, що дорівнюють температурі
гарячого теплового агенту. Згідно з тепловим балансом розраховано кількість енергії,
накопиченої шаром груші, та необхідної енергії для випарювання вологи. Встановлено,

Peculiarities of medicinal substance release under the conditions of interface diffusion process and hydrolysis of a polymeric matrix

Film systems based on chitosan of various molecular weight (334000 Da and 113000 Da) and the antibiotic of an aminoglycoside row (amikacin) have been investigated. The equations of Ritger-Peppas, Hixson-Crowell and Hopfenberg, describing kinetics of medicine release have been analyzed. It is shown that the release of amikacin from films of chitosan acetate under the conditions of interface diffusion processes and dissolution (hydrolysis) of a polymeric matrix is described more correctly by Hopfenberg’s equation.

Phenol-Formaldehyde Resins of Novolac Type with Unsaturated Side Bonds

The reaction between novolac phenol-formaldehyde resin and glycidylmethacrylate has been studied in the presence of potassium hydroxide and the synthesis procedure of phenol-formaldehyde resin with unsaturated side bonds has been suggested. The effective rates and activation energy of the mentioned reaction have been calculated. The structure of synthesized resin was confirmed by IR-spectroscopy. The synthesized resin may be used as active component of polymeric blends based on ED-20 industrial epoxy resin, its peroxy derivative (PO) and TGM-3 oligoesteracrylate.

Research of Influence of the Nature of Metal on the Mechanism of Synthesis of Polyvinylpyrrolidone Metal Copolymers

The influence of the metal fine filler nature on the polymerization mechanism of polyvinylpyrrolidone-methacrylate compositions in the presence and without iron(II) sulphate has been determined. The catalysis mechanism has been confirmed via complexation with charge transfer between the initial composition components. The metal activating effect increases with the increase of its negative electrochemical potential.

Modified Phenol-Formaldehyde Resins and their Application in Bitumen-Polymeric Mixtures

Phenol-formaldehyde resins (PhFR) with reactive methacrylate fragments or labile peroxy bonds in the side branches used as a polymeric component of bitumen-polymeric mixtures have been investigated. Taking into account that PhFR with peroxy fragments based on epoxy resin does not described in literature, its synthesis procedure has been developed. The kinetic regularities of the reaction between peroxy derivative of epoxy resin (PDER) and phenol group of PhFR were studied taking the reaction of PDER with phenol as an example.

The Process of Wastewater Treatment with Advanced Oxidation Methods to Remove Dye

The research revealed that Fenton reagent is to be utilized to remove the dye (active bright orange CS/5K) from industrial sewage. Hypercube Hyperchem Professional v8.01 software (trial) was used to carry out the quantum-chemical calculation of colouring agent structure and heat energy. Based on the information from references and the received experimental data, the oxidation mechanism of colouring agent (active bright orange CS/5K) by photo-Fenton system has been introduced.