Kristiina Kaldas

• Doctor of Philosophy
• Researcher at Tallinn University of Technology

Oxidation has been a long sought-after alternative to classical thermal processing of oil shale, in order to obtain valuable raw materials for the chemical industry. A number of different methods have been applied, but thus far, one of the most effective ways to transform oil shale to value added products, such as aliphatic terminal dicarboxylic ac...

Society’s growing demands on everyday products and materials are increasingly difficult to meet in an environment that seeks to avoid petroleum-based processes. Instead of abandoning fossil materials altogether, more research should be done on their efficient and clean conversion. One option for this is the oxidative dissolution of kerogen in water...

Until now, the oil shale kukersite has been used mainly for energy and oil production. To broaden the possible applications of oil shales, the wet air oxidation of kukersite (an organic-rich sedimentary rock from Estonia) was studied. Kukersite was oxidized with an oxygen-rich gas in water at temperatures up to 200 °C and pressures up to 60 bar. Th...

The reactivity of the aliphatic dicarboxylic acids (DCA) mixtures in similar to industrial wet air conditions (WAO) process conditions has been investigated. DCA have potential to be separated during WAO of highly polymerized organic matter (e.g. organic waste, biomass, kerogen in oil shale) before transforming to final oxidation products (CO2 and...

Oxidative dissolution of organic matter in water form mixed inorganic-organic matrix