DECHEMA

About: DECHEMA is a nonprofit organization based out in Frankfurt am Main, Germany. It is known for research contribution in the topics: Corrosion & Oxide. The organization has 756 authors who have published 1307 publications receiving 25693 citations.

Risk Governance of Emerging Technologies Demonstrated in Terms of its Applicability to Nanomaterials

Abstract: Nanotechnologies have reached maturity and market penetration that require nano-specific changes in legislation and harmonization among legislation domains, such as the amendments to REACH for nanomaterials (NMs) which came into force in 2020. Thus, an assessment of the components and regulatory boundaries of NMs risk governance is timely, alongside related methods and tools, as part of the global efforts to optimise nanosafety and integrate it into product design processes, via Safe(r)-by-Design (SbD) concepts. This paper provides an overview of the state-of-the-art regarding risk governance of NMs and lays out the theoretical basis for the development and implementation of an effective, trustworthy and transparent risk governance framework for NMs. The proposed framework enables continuous integration of the evolving state of the science, leverages best practice from contiguous disciplines and facilitates responsive re-thinking of nanosafety governance to meet future needs. To achieve and operationalise such framework, a science-based Risk Governance Council (RGC) for NMs is being developed. The framework will provide a toolkit for independent NMs' risk governance and integrates needs and views of stakeholders. An extension of this framework to relevant advanced materials and emerging technologies is also envisaged, in view of future foundations of risk research in Europe and globally.

A pore-flow-through membrane reactor for partial hydrogenation of 1,5-cyclooctadiene

Abstract: The partial hydrogenation of 1,5-cyclooctadiene was performed in a pore-flow-through membrane reactor at 50°C and 1 MPa hydrogen pressure with single capillary membranes and a bundle of 27 capillaries for scale-up studies. A preparation method for the catalytically active membranes and their characterization are described. Compared to millimeter-sized spherical catalyst pellets in fixed-bed or slurry reactors, mass transfer limitations could be successfully reduced in the membrane reactor. The conversion rate of 1,5-cyclooctadiene in the membrane reactor was mainly affected by the Pd amount and the mass flow rate of the reaction mixture through the membrane. Under optimum conditions a selectivity of 95% for cyclooctene at complete conversion of 1,5-cyclooctadiene was obtained. This value corresponds to the selectivity obtained with a powder catalyst with a particle size of approx. 25 μm in a slurry reactor for which microkinetic control of the reaction is expected to result in the highest possible selectivity. © 2007 American Institute of Chemical Engineers AIChE J, 2008