Phase separation of nonionic surfactants in aqueous solutions was used to extract cadmium and zinc. After complexation with 6-(4-nitrophenyl)-2,4-diphenyl-3,5-diazabicyclo[3.1.0]hexene-2 (pH 1), cadmium and zinc were quantitatively transferred into the phase rich with the nonionic surfactant octylphenoxypolyethoxyethanol. After the addition of tetrahydrofuran and HCl to the extract, the elements were determined by flame atomic absorption spectrometry.

Проведено сравнение результатов расчета по математической модели промышленного процесса пиролиза этана, осуществляемого на заводе “Этилен-Полиэтилен” г. Сумгаита при средней постоянной теплонапряженности радиантного змеевика, с результатами расчета этого же процесса, но с использованием предлагаемого метода позонного подвода топливного газа. Приводится разработанное математическое описание промышленного процесса с обратной связью. По найденным согласно математической модели оптимальным значениям теплонапряженностей для каждой зоны определялись оптимальные количества топливного газа, которые необходимо подвести к каждой зоне для обеспечения максимальных выходов целевых продуктов. Результаты сравнения предлагаемого метода ведения процесса с принятым в промышленности говорят о преимуществах подвода топливного газа по зонам змеевика. При этом происходит значительная экономия топливного газа и более высокий выход целевых продуктов, что в итоге дает заводу ощутимую прибыль. Приводится выражение для определения оптимального количества топливного газа, подводимого к каждой зоне, даже при изменении условий на входе в реактор – загрузки и входной температуры, что позволит оперативно управлять процессом.

The calculated results from the mathematical simulation of an industrial ethane pyrolysis process carried out at the Ethylene-Polyethylene Works in Sumgait under the average constant thermal stress of radiant coil were compared with the results calculated for the same process but using the suggested method of zoned fuel gas supply. The derived mathematical description of the industrial feedback process is given. The optimum thermal stress values calculated from the mathematical model for each zone were used to calculate the optimum fuel gas supplies to each zone, providing the maximum yields of the target products. The results of the comparison of the suggested method of conducting the process with that accepted in industry are evidence of the advantages of the fuel gas supply by the coil zones. This essentially saves fuel gas and provides a higher yield of the target products and results in a higher profit for the company. An expression is given to calculate the optimum fuel gas supply to each zone, even under variable reactor inlet conditions (loading and inlet temperature), which allows for the effective control of the process.

A two–stage optimal design procedure is suggested for alkane pyrolysis processes and is applied to propane pyrolysis. The first stage considers only hydrocarbon decomposition, the primary reaction in the process. A mathematical model consisting of an overall stoichiometric, an empirical rate, and a heat–balance and hydrodynamic equation is constructed. This model is analyzed for a varied tube diameter and a fixed propane conversion to optimize the design parameters of the propane pyrolysis reactor. At the second stage, the main reaction is considered together with secondary and tertiary reactions and a complete model taking into account recycling of the unreacted raw material is constructed. The optimum inlet temperature and recycle ratio are determined as a function of the total feed rate. An economic optimality criterion is suggested, and final process optimization is carried out.

The partial oxidation of isoamyl alcohol to isovaleraldehyde on type A zeolites modified by metal ions (Ca, Cu, and Pd) is studied within the temperature range from 200 to 350 degrees C, at volume space velocities from 1000 to 6000 h(-1), different alcohol : oxygen ratios, and atmospheric pressure. It is established that the metal-containing zeolite catalyst CuPdCaA (5% Cu2+ and 0.1% Pd2+) exhibits the highest activity in the reaction under consideration. It is shown that after the treatment of the catalyst surface with pyridine, the reaction involves molecules of isoamyl alcohol adsorbed on acid sites at the catalyst surface. The reaction kinetics is studied on the metal-containing zeolite catalyst CuPdCaA. A kinetic scheme is suggested, and the kinetic model of the process is developed on the basis of experimental data.

Structural changes are found to occur in a polymer matrix of the Cu2+-PEPA metal-polymer complexes in the oxidation medium at a high concentration of an active oxygen and hydroperoxides formed. The rearrangement of copper complexes proceeds slowly and affects the catalytic activity slightly, which allows the repeated use of these complexes.

Chemischer InformationsdienstVolume 7, Issue 20 Organoelement Compounds ChemInform Abstract: ON HYDROSILYLATION OF ALLYL AND METHALLYL PHENYL SELENIDES I. M. AKHMEDOV, I. M. AKHMEDOVSearch for more papers by this authorD. T. RADZHABOV, D. T. RADZHABOVSearch for more papers by this authorM. M. GUSEINOV, M. M. GUSEINOVSearch for more papers by this authorR. A. SULTANOV, R. A. SULTANOVSearch for more papers by this authorT. N. SHAKHTAKHTINSKII, T. N. SHAKHTAKHTINSKIISearch for more papers by this author I. M. AKHMEDOV, I. M. AKHMEDOVSearch for more papers by this authorD. T. RADZHABOV, D. T. RADZHABOVSearch for more papers by this authorM. M. GUSEINOV, M. M. GUSEINOVSearch for more papers by this authorR. A. SULTANOV, R. A. SULTANOVSearch for more papers by this authorT. N. SHAKHTAKHTINSKII, T. N. SHAKHTAKHTINSKIISearch for more papers by this author First published: May 18, 1976 https://doi.org/10.1002/chin.197620298Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume7, Issue20May 18, 1976 RelatedInformation