Conversion of the propane-butane mixture at presence Pt-containing zeolite catalyst is researched at 300-500°C. It is shown that with increase in temperature of carrying out of process the yield of aromatic hydrocarbons, the maximum quality aromatics Ce-Ce increases reaches 40.0%wt at 500°C and a feed space velocity of raw materials 100 lr1. Conversion butanes thus reach is 94.0%.
N-hexane and gasoline fraction conversion on bismuthchromezeolite catalyst at 300-500°C was researched. It was showed that in cataly sate total content of izomerization products reduce. The maximum content of aromatic hydrocarbons is 16.5% at 450°C and minimum benzene formation (0.8%). Ennoblement of gasoline fraction on bismuthchromezeolite catalyst contributes increase octane number on 29 points at 400°C. Benzene content is 1.4% that accord with environmental requirements of motor fuels.
The quenching of fluorescence of europium chelate (111) with tenoiltrif- toratseton solubilized in the micelles of Bridge-35 with rutin is studied. The possibility of a direct fluorimetric determination of bioantioxidants in the drug «Ascorutin» with a detection limit of 2.9 10 M is shown.
Phase equilibria and critical phenomena in cut 3 of the quaternary system water - pyridine - butyric acid - potassium chloride whose constituent ternary liquid system had a closed binodal curve were studied by means of the visual-polythermal method within 5-90°C. We have determined the temperature dependence of the solution composition corresponding to the critical solution point of the immis- cibility region.
Phase equilibria and critical phenomena in the ternary system potas sium formate - water - n.butoxyethanol, where a constituent binary liquid system is characterized by phase separation with a closed delamination region, were studied by means of the visual-polythermal method within 25-170°C. The temperature dependences of the com positions of the mixtures corresponding to the critical solubility points in the delamination region were determined.
The bromination of condensed chromen-2-ones is carried out. The influence of medium on the reaction occurrence has been studied. In the acidic acid solution aromatization of the 4H-pyrane fragment or hydrogen atom substitution at the tertiary carbon atom takes place. In chloroform, addi tion of bromine by the double bond occurs. Mixture of tetrachloromethane and propanol-2 promotes the intermolecular dehydration with the formation of ether bond.
A technique of laboratory synthesis of potassium formate has been developed. Phase equlibria in mixtures of the components of the binary system potassium formate - water in the range from -70 to +170°C were investigated by the visual-polythermal method. For the first time the phase diagram of the specified system has been con structed and the coordinates of an eutectic point has been estab lished. The formation of a crystalline hydrate КНСООИ.бНгО incon gruous melting at -9.2°C was found in this system.
Потенциометрическим методом исследовано комплексообразование редкоземельных элементов (РЗЭ) La, Се, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm и Yb с о-фталевой кислотой при р = 0.2(KCI) в интервале температур 298-328 К. В области pH = 3.8-5 обнаружено существование комплексной частицы состава LnL , где
The role of spatial and electronic structure, hydrophobic properties and concentration of organoselenium compounds on their interaction with fungal metabolites - carbohydrate-binding proteins, extracellular lectins of Lentinula edodes (shiitake mushroom) has been consi dered. By the hybrid density functional theory method at the B3LYP/6-31G(d,p) theory level, spatial and electronic structure of the 1,5-di(4-R-phenyl)-3-selenopentanediones-1,5 molecules has been studied.
The bioptates of 170 patients with ulcer disease and stomach cancer were analyzed to reveal Helicobacter pylori with the help of histological and molecular-genetic techniques. The cantomination levels of Helicobacter pylori in various clinical cases were determined. The most virulent strains responsible for complication development, including ulcer-cancer transformations, were revealed.
