Evonik Degussa Gmbh

Hanna Hahn

Robert Franke

Dirk Fridag

Katrin Marie Dyballa

Marc Becker

Guido Stochniol

Peter Wasserscheid

Horst-Werner Zanthoff

Thomas Quandt

Markus Priske

Jens Busse

Sascha Hoch

Marina Lazar

Marco Haumann

Matthias Blug

Wolfram Jaegermann

Wolfram Calvet

Bernhard Kaiser

Simon Walter

Sachsa Hoch

Busse Jens

The invention relates to a photoelectrochemical cellfor light-driven production of hydrogen and oxygen, especially from water or another electrolyte based on aqueous solution, having a photoelectric layer structureand an electrochemical layer structurein a layer construction, where&#x2014;the photoelectric layer structurefor absorption of lightuninfluenced by the electrolyteforms a front sideof the layer structure, and&#x2014;the electrochemical layer structure, for accommodation of the electrolyte, forms a reverse sideof the layer construction, and&#x2014;a conductive and corrosion-inhibiting coupling layerforms electrical contact between the photoelectric layer structureand the electrochemical layer structurein the layer construction, where&#x2014;the electrochemical layer structurehas an electrode structure of a front electrodeand an electrode structure of a rear electrode, between which is arranged an ion exchange layersuch that an integrated layer constructionis formed with the ion exchange layerin contact with the electrode structure of the front electrodeformed for conversion of the electrolyteand/or with the electrode structure of the rear electrode

Photoelectrochemical cell, system and process for light-driven production of hydrogen and oxygen with a photoelectrochemical cell, and process for producing the photoelectrochemical cell

The invention relates to processes for preparing aldehydes by hydroformylation of alkenes, in which an alkene-containing feed mixture is subjected to a primary hydroformylation with synthesis gas in the presence of a homogeneous catalyst system, the primary hydroformylation being effected in a primary reaction zone from which a cycle gas containing at least some of the products and unconverted reactants of the primary hydroformylation are drawn off continuously and partly condensed, with recycling of uncondensed components of the cycle gas into the primary reaction zone, and with distillative separation of condensed components of the cycle gas in an aldehyde removal stage to give an aldehyde-rich mixture and a low-aldehyde mixture. The problem that it addresses is that of developing the process such that it achieves high conversions and affords aldehyde in good product quality even in the case of a deteriorating raw material position. More particularly, a solution is to be found for making legacy oxo process plants capable of utilizing lower-value raw material sources. This problem is solved by separating the low-aldehyde mixture into a retentate and a permeate by means of a membrane separation unit in such a way that alkenes present in the low-aldehyde mixture become enriched in the permeate, while alkanes present in the low-aldehyde mixture become enriched in the retentate. The alkene-rich permeate is then transferred into a secondary reaction zone and subjected to a secondary hydroformylation therein with synthesis gas in the presence of an SILP catalyst system. The reaction product obtained from the secondary hydroformylation is recycled into the aldehyde removal stage.

Two-stage hydroformylation process with circulating gas and SILP technology

The present invention relates to a composition comprising:

Supported composition and the use thereof in methods for the hydroformylation of unsaturated compounds

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Duisburg-Baerl, Germany

Hanna Hahn