Production and study of thio-bis-hydroxyalkylbenzyl sulfonates as lubricating oil additives

Thio-bis-hydroxyalkylbenzyl sulfonates of calcium of varying alkalinity have been synthesized from products of sulfomethylation of sulfurated alkyl phenols obtained by using 170-240 °C fraction of α-olefins produced in the high-temperature ethylene oligomerization process. The sulfonate-additive modifications obtained dissolve fully in basic oils, and markedly improve their deterging-dispersing, anti-oxidation, and anti-corrosion properties. The synthesized compounds can be used as multifunctional additives in additive packages for engine oils.     

Preparation of a medium alkalinity sulfonate additive for motor oils

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 2, pp. 18–19, February, 1989.     

Implementing a Method for Stochastization of One-Step Processes in a Computer Algebra System

When modeling such phenomena as population dynamics, controllable flows, etc., a problem arises of adapting the existing models to a phenomenon under study. For this purpose, we propose to derive new models from the first principles by stochastization of one-step processes. Research can be represented as an iterative process that consists in obtaining a model and its further refinement. The number of such iterations can be extremely large. This work is aimed at software implementation (by means of computer algebra) of a method for stochastization of one-step processes. As a basis of the software implementation, we use the SymPy computer algebra system. Based on a developed algorithm, we derive stochastic differential equations and their interaction schemes. The operation of the program is demonstrated on the Verhulst and Lotka–Volterra models.     

Catalytic dehydromethylation of methylcyclohexane and the simultaneous transformation of fractions of straight-run gasoline and methanol with modified forms of mordenite and pentasil

Results are presented from studies of the dehydromethylation (DHM) of methylcyclohexane (MCH) and the simultaneous transformation of straight-run gasoline fractions and methanol on modified forms of mordenite and pentasil in the presence of various hydrogen acceptors (O₂, CO₂). High selectivity on xylene isomers is observed for polycationic modifications of HNa-TsVM. On such catalytic systems, the degrees of DHM and dehydrodisproportionation (DHD) of MCH grow with an increase in O₂-to-CO₂ ratio in the range of 0.05 : (1–1.5), while the degree of its dehydrogenation to toluene is virtually constant. High yields of di- and trimethylbenzenes are achieved in the reactions between methanol and gasoline fractions composed mainly of C₇–C₈ hydrocarbons at 100–140 °C. The results from this study can be used for straight-run gasoline reforming with the aim of increasing the yield of C₈-C₉ aromatic hydrocarbons.     

Some features and the mechanism of regulation of the molecular-mass distribution of products of ethylene oligomerization in the presence of zirconium-containing metal complex systems (A review)

It was shown that the deviation of the product distribution from the Schultz-Flory law upon ethylene oligomerization in the presence of some catalytic systems based on zirconium compounds is due to their multisite character and a multiroute mechanism of the process. The feasibility of switching the base multiroute multisite multifunctional catalyst systems to monofunctional operation with a narrow molecular-mass distribution (MMD) of oligomerization products was shown using zirconyl carboxylate systems as an example. A comparative evaluation of the kinetic parameters of individual ethylene oligomerization steps and an analysis of the behavior of the MMD in the presence of three different catalyst systems were performed. A possible mechanism of regulation of the character and width of the MMD of the oligomerization products is discussed.     

Medium-caustic sulfonate additive for motor oils. Based on alkyltetralin

Effective new additives, including sulfonate additives, are required for creating high-quality motor oils which meet the requirements of current and future technology [1]. We developed a medium-caustic synthetic sulfonate additive based on alkyltetralin. Translated fromKhimiya i Tekhnologiya Topliv i Masel, No. 5, pp. 31 – 32, September – October, 1999.