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At present, actual problem is to measure the flow of liquid and gaseous hydrocarbons without separation. One of the problems associated with the definition of the parameters of motion multiphase mixtures, is to determine the parameters flows liquid and gaseous hydrocarbons of multiphase flow for multiphase meters that make measurement without separation of the hydrocarbon mixture into individual phases and fractions. The use of such flow measuring devices can greatly simplify the process of measuring the flow of hydrocarbon mixture to make it more responsive (including the use for mobile multiphase flow and compact subsea devices) and more cost effective. The object of this study is multiphase flowmeter flow path and the processes occurring along the axis of the flowmeter. the Venturi tube, designed to measure the volumetric rate flowing therein medium using differential pressure, is considered as a measuring means. Based on the results of numerical solution of equations for steady turbulent flow of compressible multiphase flow the accuracy of measurement of pressure along the axis measuring part of the Venturi tube and the pressure unit is estimated, and also the flow of multiphase medium is considered. [ABSTRACT FROM AUTHOR]

Synthesis of pentafluorobenzenesulfonyl bromide from pentafluorobenzenethiol, bromine and hydrogen peroxide is presented. Reactions of pentafluorobenzenesulfonyl bromide with primary alkenes (1-hexene, 3-chloro-1-propene and 3-bromo-1-propene) in solvent-free conditions are described. [ABSTRACT FROM AUTHOR]

Highlights: [•] We computed electronic second-order hyperpolarizabilities of fluorobenzenes. [•] The calculations were performed in gas phase at the HF and MP2 levels. [•] Third Harmonic Generation NLO phenomenon was investigated at λ =1910nm. [•] The hyperpolarizabilities are linearly related to the number of fluorine atoms. [•] The hyperpolarizabilities decrease with increase of the number of fluorine atoms. [Copyright &y& Elsevier]