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Influence of sorbent type on dehalogenation of reducing gas without condensing fraction.
Šrámek, Vít ; Skoblia, S. ; Staf, M. ; Beňo, Z. ; Pohořelý, Michael
Chemical recycling of plastics is one of possible option to process large amount of currently difficultly recycled plastic waste. It would be possible to fulfil goals of the amount of recycled waste by means of chemical recycling. Principle of chemical recycling is conversion of plastic waste to basic hydrocarbon substance that could be used in refineries or petrochemical industry. The main technological challenge is the presence of halogens in plastic waste (in plastics as substances containing chlorine in form of PVC or brome in form of additives/flame retardants). During chemical recycling via pyrolysis, these substances can transfer to products and cause problems in succeeding technologies (corrosion, poisoning of catalysts etc.). One of the solutions how to eliminate these unwanted substances could be high temperature sorption of primal pyrolysis gas on sorbents before its condensation. Experiments with model gas containing halogenated compounds and different inorganic sorbents were conducted for this purpose. Gained results allowed us to narrow down the amount of sorbents suitable for high temperature removal of halogenated compounds from primal pyrolysis gas produced during pyrolysis of plastics.
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Biodegradation of environmental pollutans - Crystallization haloalkan dehalogenase DpcA of Psychrobacter cryohalolentis K5
JUNG, Jakub
Knowledge of protein structures is necessary to clarify their structure-function relationships. Haloalkane dehalogenases are microbial enzymes that catalyze the hydrolysis of carbon-halogen in the halogenated hydrocarbons. Based on their properties these enzymes are able to degrade halogenated compounds. As the environment is burdened by a lot of different pollutants, biodegradation is a necessary step to improve the quality of environment. Haloalkane dehalogenases can be used as biosensors since they can detect contamination by halogenated compounds. This thesis is focused on crystallization of the model protein lysozyme and haloalkane dehalogenase DpcA isolated from the organism Psychrobacter cryohalolentis K5. The aim of this work was to prepare crystals suitable for X-ray diffraction analysis. After verification of protein?s purity, both proteins were crystallized by the use of basic and advanced crystallization methods. Single crystals of suitable size and quality for X-ray diffraction analysis were obtained and diffraction data were used to solve the 3D atomic structure of the DpcA. Since haloalkane dehalogenases have a low activity for halogenated substrates, the main aim of protein engineering is to increase their activity so thus further research is focused on modification of substrate specificity.
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Dehalogenation of Polychlorinated Phenols
Bureš, M. ; Pekárek, Vladimír
The aim of this study is thermodynamical study of dehalogenation of polychlorinated phenols in the gaseous state by means of steam in presence of solid copper. The purpose of this study is a thermodynamical interpretation of reaction mechanism of dehalogenation processes and comparison with the measured kinetics data.The work carried out with polychlorinated benzenes and is a part of more wide research program, dealing with dehalogenation of polychlorinated aromatic polutants.
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