Alfred Ritter

A process steam generator based on the high temperature magnesium hydride/magnesium heat storage system

As a first pilot project application of the reversible thermochemical high temperature heat storage system magnesium hydride/magnesium a process steam generator has been built and tested. It draws the heat for the generation of superheated steam from a magnesium hydride/magnesium (MgH2Mg) heat store and is primarily meant for the storage of high grade industrial waste heat which can be made available as superheated process steam during peak load hours. In addition, other areas of application, for instance in high temperature solar engineering, are also opened.

Reactions of M(CO)6 (M Cr, Mo) with formamidines

Abstract The reactions of hexacarbonyl-molybdenum and -chromium with arylformamidines yield Mo 2 {HC(NR) 2 } 4 and Cr 2 {HC(NR) 2 } 4 , respectively. In the case of Mo the reaction proceeds by the formation of pentacarbonyl formamidinemolybdenum and tetracarbonyldiformamidinemolybdenum complexes. Reaction of Mo 2 {HC(NR) 2 } 4 with Mo(CO) 6 yield the novel complexes Mo 2 {HC(NR) 2 } 3 -{HC(NR)NR · Mo(CO) 3 } and Mo 2 {HC(NR) 2 } 2 {HC(NR)NR · Mo(CO) 3 } 2 , in which the [Mo(CO) 3 ] moiety is bonded to one of the aromatic groups. In the case of chromium, only Cr 2 {HC(NR) 2 } 3 {HC(NR)NR · Cr(CO) 3 ¦ could be prepared. In solution, the formamidine complexes show monomer—dimer equilibria, which are strongly dependent on the nature of R. W(CO) 6 reacts with formamidines, but did not yield complexes analogous to those for chromium and molybdenum. The properties of the new complexes are discussed.

Photolysis at λ 185 nm of hexamethyldisiloxane in the liquid phase

Abstract Liquid hexamethyldisiloxane has been photolyzed at 15°C with a low pressure Hg arc (affective wavelength 185 nm). 19 products have been identified and their quantum yields determined. The quantum yields of the three main products are φ[CH 4 ] = 0.20, φ[C 2 H 6 ] = 0.045, and φ[(Me 3 SiOSiMe 2 ) 2 ] = 0.042. The main event in this photolysis is the rupture of a SiC bond, following the homolytic (i) as well as the molecular mode (ii). Process iii occurs to a minor extent, but iv is not found at all. Cage disproportionation reactions cannot be distinguised from molecular eliminations in these experiments. The very reactive intermediate species Me 3 SiOSi(Me)CH 2 interacts with free radicals, with polar compounds such as methanol, and with each other, with the formation of stable compounds. It appears the Me 3 SiOSi(Me)CH 2 is also formed in a disproportionation reaction (vi).

SOLAR POWER STATION WITH THERMOCHEMICAL STORAGE

ABSTRACT dtsch. Ein thermochemisches Warmepumpensystem, bestehend aus einer Hochund Niedertemperaturhydridpaarung, wird wahrend der Sonnenscheinzeitendurch einen Fix-Focus Sonnenspiegel dehydriert. Das System erzeugtmit hohem Wirkungsgrad rund um die Uhr in beliebiger Verteilung Hochtemperaturwarme, Kalte, Warmwasser und - mittels einer Stirlingmaschine - elektrischen Strom. Es stellt somit ein ideales dezentrales Sonnenkraftwerk, zum Beispiel in der Form kleiner Hausenergiezentralen, dar. ABSTRACT engl. A thermochemical heat-pump system, consisting of a combination of a high and a low temperature hydride, is desorbed during sunshine by a Fix-Focus solar mirror. The system produces around-the-clock with high efficiency and at any desired repartition high temperature heat, cooling, domestic warm water, and - by the aid of a Stirling engine - electricity. It is representing an ideal, decentral solar power station, for example in the configuration of small house-energy-stations.