Chemistry

It belongs to the sunflower family, grows in Africa as a wild plant and is considered by many to be a weed: Vernonia galamensis, commonly known as ironweed. But the plant that can only grow along the equator has attractive properties: Its seeds contain a high proportion of unsaturated epoxidized fatty acids, which can account for up to 80% of the oil content in some Ethiopian species. Researchers at the Max Planck Institute for Chemical Energy Conversion in Mülheim an der Ruhr now want to produce special "green" plastics from this vegetable raw material.

Crude oil is of great value to the chemical industry because of the carbon compounds it contains. Not only vegetable biomass, but also the greenhouse gas carbon dioxide can be considered as an alternative source of carbon for chemical processes - as long as these processes are profitable. Catalysts are a key element for economic efficiency. Researchers at the Fraunhofer Institute for Interfacial Engineering and Biotechnology (IGB) are working on optimizing such catalysts and processes.

It is another success for the Swiss specialty chemicals group Clariant: In the pre-commercial lignocellulose biorefinery in Straubing, Bavaria, the company has now enzymatically processed around 30 metric tons of Miscanthus grass, also known as maiden silvergrass or elephant grass, into lignocellulose sugars and ethanol.

So far, they have only been nominated, but this in itself is already a distinction: the three chemists Walter Leitner, Christoph Gürtler and Berit Stange have made it to the final of the German Future Prize 2019. Their research success is an important building block for a future carbon cycle economy: The three scientists have developed a process with which polyols can be produced from the greenhouse gas carbon dioxide, which in turn are the starting material for the polyurethane plastics group. So far, polyols have been produced primarily from crude oil.

The second generation of biofuels is produced from agricultural residues, such as grain straw or Chinese reed. The Swiss specialty chemicals group Clariant AG has developed sunliquid technology for this purpose, a biotechnological process in which cellulose-ethanol can be produced from plant residues. In Straubing, Bavaria, Clariant operates a demonstration plant for the lignocellulose biorefinery. This technology has now found a second licensee in PKN Orlen, a petroleum company that is particularly strong in Central Europe.

Ludwigshafen-based BASF, the world's largest chemical company, has acquired the Dutch company Isobionics, which specializes in the biotechnological production of fragrances and flavors. BASF also announced its cooperation with the US company Conagen, which produces biotechnological production strains used, among other things, for the production of vanillin.

Until now, there were two types of catalysts that could be used for fuel cells: expensive precious metals such as platinum or short-lived biological molecules. A cooperation between researchers from the Ruhr University Bochum (RUB) and scientists from Marseille has now succeeded in developing a biocatalyst that will theoretically last 22,000 years.

It has been known for several years that bacteria can degrade PET, which is mainly used for plastic bottles: Microorganisms such as Ideonella sakaiensis - discovered in 2016 on a partially decayed PET bottle in Japan - release an enzyme called PETase. This enzyme is able to break down the chain molecules of the plastic into its components. "This is of particular interest when it comes to the degradation of microparticles, for example microplastics," explains Daniel Moog, head of the junior research group at the Philipps University in Marburg.

The chemical industry is intensively researching ways to replace crude oil with renewable alternatives. Of particular interest here is the approach of using the greenhouse gas carbon dioxide, which is produced as exhaust gas in many processes. In this way, the climate could be protected at the same time as carbon could be fed into a sustainable circular economy. The newly launched "ElkaSyn" project is now investigating two approaches to making such processes more efficient and thus more economical.

For many pollutants such as pesticides, the legislator has set threshold values. Below these limits, exposure is considered harmless. However, this does not seem to apply to many living organisms, including humans, as ecotoxicologists at the Helmholtz Centre for Environmental Research (UFZ) have now been able to show.