Purification of hydrocarbon raw materials of oil field Zhanazhol from methyl- and ethylmercaptane

Abstract

There is considered the oil of «Zhanazhol» oil field in the Aktyubinsk region in this
research work, which is classified and composition refers as unique oil. Here are given the physicochemical characteristics of the Zhanazhol oil field, which is characterized by a high content of sulfur
compounds (hydrogen sulphide, mercaptans) and other high molecular weight inert compounds. It
requires the necessary preparation to meet the requirements of GOST. The fractional composition
is determined the oil of the Zhanazhol oil field, potential content calculated of the fraction from
the boiling point to 15 0 C, equal to 27,5 % by weight gasoline. And where the demercaptanization
process of oil and gasoline are described, which consists in preliminary degassing, thermal dehydration, electrochemical demineralization and stabilization at an oil refinery unit (ORU). The main
characteristics of oil entering the demercaptanization unit of oil are investigated, where the process of desulfurization of liquefied hydrocarbon gases and deodorization of high boiling hydrocarbon
gasoline, kerosene, diesel fractions and oils is being carried out. To accelerate the conversion of mercaptides to disulfide oil, an oxidation catalyst of the appropriate concentration was used. To remove
unwanted sulfur-containing components, there is used the process of alkalizing the light gasoline
fraction, with its preliminary isolation in the distillation column. The isolation of light gasoline
fraction markedly reduced the amount of product subject to demercaptanization, thereby reducing
capital investment in the demercaptanization unit. The distillation curve was calculated on the basis
of the yields of the fractions at 200 and 300 0 С and the yield of the fraction of b.p. - 150 0 С. For the
purification of the gasoline fraction, the Merox process was used, which took place in several stages.
The specific consumption of reagents in the processes of demercaptanization of oil and fractions is
calculated. It is shown that the application of demercaptanization of oil, but of the fraction with a
boiling point of 150 0 С leads to a significant technological and economic effect.