MICROELEMENT ANALYSIS OF OILS USING PLANTS BASED ON HIGH-ENERGY NUCLIDE NEUTRON SOURCES

The microelement analysis of oils is a science-and-technology problem of current concern. Ratios of some microelements in oils provide information on the oil nature, age, migration and, often, govern development strategy selected for an oil reservoir. On the other hand, some microelements, even if present in small quantities, can essentially damage processing equipment, induce corrosion and breakdown of basic assemblies of oil refineries, poison catalytic agents and impoverish quality of marketable products. Furthermore, some compounds of microelements belong to highly toxic substances which are hazardous for the ecology and health while their emissions in the atmosphere greatly complicate environmental situation in oil production regions. The microelement analysis of oil is carried out using chemical, physical and nuclear physics methods. Amongst the nuclear physics methods, the neutron activation analysis using nuclear reactors find the most often application. The advantage of this method is high sensitivity and feasible determination of many elements in a sample at the same time. The disadvantages can be described as the need of oil sample calcination and the presence of cooled channel of the reactor, which limits the analysis of crude oil samples. The authors of this article discuss applicability of the neutron activation analysis of oil elements using plants based on powerful neutron sources. A stibate–beryllium source (124Sb-Be) with the neutron yield of 1010 n/s was used as a source. Oil samples were placed in a slot between beryllium and graphite, in polyethylene cartridges with a capacity of 800–900 g. Exposed samples were processed on spectrometer facility based on semi-conductor Ge(Li) detector in special cartridges tightly put on the protection enclosure of the detector. The choice of the analysis times (periods of exposure, cooling and measurement) is governed by the required sensitivity, productivity and oil composition. The determination limits are obtained for 10 microelements based on long-lived isotopes in oil.

Keywords

Oil microelements, neutron activation analysis, stibate—beryllium neutron source, semi-conductor detector, measurement time, exposure time, cooling time, determination limits.

Issue number: 11
Year: 2018
ISBN:
UDK: 550.83
DOI: 10.25018/0236-1493-2018-11-0-121-128
Authors: Medvedev A. A., Poserenin A. I., Romanov V. V.

About authors: Medvedev A.A., Candidate of Technical Sciences, Professor, e-mail: medvedev747@yandex.ru, Moscow State University of Civil Engineering, Moscow, Russia, Poserenin A.I. (1), Senior Lecturer, e-mail: poserenin83@gmail.com, Romanov V.V. (1), Candidate of Technical Sciences, Assistant Professor, e-mail: roman_off@mail.ru, 1) Russian State Geological Prospecting University named after Sergo Ordzhonikidzе (MGRI-RSGPU), 117997, Moscow, Russia.

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