In the article the chemistry of the noncatalytic oxidative desulfurization process of distillate oil fractions is analyzed. The study involves the characteristics of high-sulfur straight-run diesel fraction of narrow composition (593–623 K) before and after oxidation by air at 453–493 K and a pressure of 3.0 MPa. The composition of sulfur compounds in the raw material fraction was determined. It is shown that straight-run fractions of raw materials may also contain sulfoxides, which are products of oxidation of organosulfur compounds and are formed during storage of petroleum products.
The article deals with the determination of hydrodynamic parameters necessary to conduct the desulfurization process of straight-run kerosene (SRKF) and straight-run diesel fractions (SRDF) via oxidation of sulfuric organic compounds, followed by the removal of oxidation products. The established parameters which are characterized by the linear rate of the oxidant (air) movement and the dummy contact time between the oxidant and the feedstock allow the process to be carried out without stirring.
The effect of oxidant composition on the oxidative desulfurization of low grade coal has been studied to obtain raw materials for the production of pulverized coal. The experimental-statistical model has been developed that allowed to establish optimum conditions of the investigated process.
New generation concretes and mastics, as well as the prospects of using them for repairing and restoration works in the construction industry have been described in this article.
From known composite materials polymeric sulfur is often use. Speed dialing strength, no capillary-porous structure, the inactivity of sulfur to various aggressive environments enables to develop an effective composite mixture.
The new method of polymeric sulfur obtaining based on the polymerization of atoms instead of molecules has been proposed. It has been proven that using the new method essentially increases polymerization degree (over 90 %).