Concerning their application properties and environmental impact, native based cooling lubricants show immense potential. However, until recently these products are barely used, for economic reasons. The high costs are founded in expensive raw materials (vegetable oil respective tallow) and high synthesis efforts during further processing to basis oils for lubricants. Thus competitive native lubricants can only be produced with low-priced raw materials (e.g. fats from rendering plants, used cooking oil) and a reduction of costs during synthesis. The aim of this thesis was the development of high quality, oxidation stable cooling lubricant, based on monoalkylesters made from used cooking oils (UCO) and fats from rendering plants that can be competitive to mineral oil based products. For that purpose, fats from rendering plants and UCO have been analysed, testing their suitability as raw material for the production of lubricants. Based on this analyses, processes for the transesterification of theses fats with methanol have been developed respective optimised. To increase the oxidation stability by raising the saturated components of the methylesters, experiments with fractionation and hydrogenation have been accomplished. In order to optimise the properties of the lubricants, e.g. viscosity, pour point and flash point, methods for the transesterification of the methylesters with alcohols up to eight C-atoms have been developed. The suitability of the alkylesters produced by this means for the application as lubricants, was controlled in subsequent analyses.
«
Concerning their application properties and environmental impact, native based cooling lubricants show immense potential. However, until recently these products are barely used, for economic reasons. The high costs are founded in expensive raw materials (vegetable oil respective tallow) and high synthesis efforts during further processing to basis oils for lubricants. Thus competitive native lubricants can only be produced with low-priced raw materials (e.g. fats from rendering plants, used cook...
»