Abstract
Change in group composition of sulfur compounds and structural group composition of the diesel fractions in the course of hydrotreating is presented in the paper. The removal degree of sulfur compounds is shown to comprise 95.8% rel. The homologs of benzothiophenes are removed for 93.9% rel., ones of the dibenzothiophenes are for 90.7% rel. A considerable change in group composition of diesel fraction is established in the course of hydrotreating. Hydrogenation degree of aromatic hydrocarbons is 24.4% wt., the amount of saturated hydrocarbons has increased by 20.4% wt.
Highlights
The main industrial process for sulfur removal is catalytic hydrodesulphurization in which sulfur compounds (SC) break down forming hydrogen sulfide, and the hydrocarbonic part of raw material molecules is restored and remains as a part of the target liquid products [1]
Change in the total sulfur content in the course of hydrotreating of diesel fuel depending on time of the process at a temperature of 380 °C is presented in table 1
It is established that the use of the GKD-202 catalyst in the course of hydrotreating of the diesel fraction allows removing more than 95.8 % rel. from the initial quantity of sulfur in the raw materials
Summary
The main industrial process for sulfur removal is catalytic hydrodesulphurization in which sulfur compounds (SC) break down forming hydrogen sulfide, and the hydrocarbonic part of raw material molecules is restored and remains as a part of the target liquid products [1]. Tougher ecological requirements to gasolines and diesel fuels [2,3,4,5] dictate the need of increase in capital and operational expenditures for production of fuels with low sulfur content. An increase in production costs is caused by an increase in hydrogen partial pressure in the system and decline in reactor capacity [6,7,8]. Temperature increase of the process causes increase in hydrogenolysis depth of SC, and leads to deeper hydrogenation of aromatic and olefin hydrocarbons. The undesirable reactions of hydrocracking leading to formation of gasoline and merkaptan increasing the total sulfur content in the products are possible.
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