Titov T. Increase of environmental safety of coke production by chemical removal of carbon disulfide from benzene fraction

The thesis is dedicated to increase of the environmental safety of coke production by chemical removal of carbon disulfide from the benzene fraction and development of physical and chemical foundations of its interaction with nucleophilic reagents with the formation of alkaline salts of dithiocarbamic, xantic and trithiocarbonate acids and their subsequent complexation with some 3d-metals in benzene solution. The system carbon disulfide - nucleophile - alkali was studied and established optimal conditions of chemical removal of carbon disulfide. Anti-wear and friction properties of dithiocarbamates and xanthates of metals as additives to industrial oils were explored. It was established the dependence of anti-wear properties of lubricating compositions on the nature of the metal and ligand surrounding of the studied additives. An increasing of environmental safety of coke production was explored in view of reducing ecotoxic hazard of carbon disulfide due to its deep chemical transformation. It was established that during the chemical interaction between CS2 and alkylammonium salts of aryl- and alkylphenoxycarboxylic acids, the ecotoxicity of the products decreases by 77.6 - 144.0 times comparatively to the primal substances. It was proposed the technological scheme of chemical removal of carbon disulfide from the benzene fraction of coke production using alkylamines in an alkaline media that can be used effectively on distillation stage of organic compounds of coke production and will improve the ecological state both the production and the environment.