Deutsches Zentrum Fur Luft-Und Raumfahrt E.v.

Deutsches Zentrum Fuer Luft-Und Raumfahrt E.v

Deutsche Forschungsanstalt Fur Luft-Und Raumfahrt E.v.

Karl-Heinz Funken

Jurgen Ortner

Michael Sattlegger

Rudolf Sizmann

Christian Sattler

Gerda Horneck

Lamark De Oliveira

Barbara Milow

Delia Faust

Karl-Friedrich Knoche

Claudia Schmitz

Oliver Weinmann

Manfred Schafer

The present invention relates to a device and method for introducing solar radiation energy into a photoreactor. This reactor can be employed for performing photochemical or photobiological reactions, i.e., syntheses, decontamination, disinfection and treatment processes. The device is characterized in that the photoreactor consists of one or more transparent outer tubes irradiated with light from the exterior, the reaction medium being passed through the tubes and thereby exposed to the radiation, wherein one or more empty transparent tubes with a smaller diameter are provided in the interior of said outer tubes, especially in a concentric arrangement, and the reaction medium is passed through the gap formed between an outer and an inner tube or, in the case of several inner tubes, through the gaps formed therebetween.

Solar photoreactor

The present invention relates to metallated or unmetallated porphyrin derivatives which have varying amphiphilic properties and which may be bonded to polymers, and to processes of their preparation. The present invention further relates to photosensitizers comprising said porphyrin derivatives, and to the use of said photosensitizers for the catalytic formation of singlet oxygen.

Metallated or unmetallated porphyrin derivatives having amphiphilic

A process for recycling waste sulfuric acid by decomposing organic contaminants by use of light energy, comprising exposing a waste sulfuric acid containing contaminants to a focused radiation emission having an irradiation intensity within the range of from 0.01 to 100 MW/m.sup.2 in a reaction chamber shaped as a directly-absorbing receiver, wherein the chamber is maintained at a temperature within the range of from 200.degree. C. to 1000.degree. C. to form sulfur trioxide and water as sulfuric acid decomposition products. The process also includes forming sulfur dioxide and oxygen, starting materials for sulfuric acid, by cleavage of the decomposition product sulfur trioxide by maintaining the reaction chamber at a temperature between 400.degree. C. and 1500.degree. C. The process, particularly adapted for irradiations with direct solar radiation.

Process for recycling waste sulfuric acid

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Bonn, Germany

Karl-Heinz Funken