Riedel process

In the electrochemical processes, an aqueous solution of sulfuric acid (550 to 570 g/L) (Degussa-WeiKenstein Process) or of sulfuric acid (260 g/L) and ammonium sulfate (210 to 220 g/L) (Lowenstein-Riedel Process) is electrochemically oxidized at the anode to peroxodisulfuric acid or ammonium peroxodisulfate respectively and reduced at the cathode producing hydrogen. 

Diammonium peroxodisulfate is produced by electrolyzing solutions of ammonium sulfate and sufuric acid, in cells with or without diaphragms, using the Lowenstein-Riedel Process (see Section 1.3.2.1) ... 

Lowenstein-Riedel An electrolytic process for making hydrogen peroxide by the electrolysis of a solution of sulfuric acid and ammonium sulfate. Ammonium peroxodisulfate, (NH4)2S208, is an intermediate. This, and the Weissenstein process were made obsolete with the invention of the AO process. 

Riedel A process for making vanillin from guiacol derived from catechol. Invented by J. D. Riedel in 1932. 

Riedel, L. Enthalpie-water content diagram for lean beef (also valid for other meats with fat content below 4 %). Recommendations for the processing and handling of frozen foods, p. 28 and 29. International Institute of Refrigeration 75 Paris 17e, France, 2. ed 1972... 

Riedel and coworkers have also uncovered some extremely novel chemistry based on the use of carbodiimide chemistry, including a case where precursor architecture influences phase and compositional development49. The process begins with the very simple synthesis of silylcarbodiimides (equations 15 and 16). In the case where R = Me, the compound is a 16-atom heterocycle (x = 4). For R = H, a polymer is obtained that gives a 65 wt% ceramic yield at 1500 °C and a SiCi.gNi.3 (1000 °C) composition. 

Kieback, B., Neubrand, A., Riedel, H. (2003), Processing techniques for functionally graded materials , Mater. Sci. Eng., A362, 81-105. 

There are some multifunctional biometals like Mg and Mn(II) the complexes of which are rather labile in both kinetic and thermodynamic terms (Taube 1952 Riedel 2004 Jordan 1994), in spite of their high AC orders. This situation goes beyond the description by Sabatier s principle every (bio-)autocatalytic process promoted by such metal ions is going to have an exit order near 1 at least, summing up to an exit order 1 for snch metals. This also holds for photosynthe-... 

In the previous section it was mentioned that Riedel et al. ° developed a nonoxide sol-gel process for ternary Si-C-N ceramics. This concept can be expanded to quaternary Si-B-C-N ceramics. Boron-modified PSCs were obtained in quantitative yields from tris(chlorosilyl-ethylene)boranes, B(C2H4SiRCl2)3, which were reacted with excess bis(trimethylsilyl)carbodiimide, Me3Si-N=C=N-... 

Riedel, K., Renneberg, R., Wolienberger, U., Kaiser, G., Scheller, F., Microbial Sensors. Fundamentals and Applications for Process Control , J. Chem. Tkch. Biotechnol. 44 (1989) 85-106. 

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