Olin-Raschig process

The above reaction is catalyzed by copper and other trace metal impurities and can be prevented by adding a suitable complexing agent. In a modification of the Raschig process, what is known as Olin-Raschig process, liquid chlorine feed is continuously absorbed in dilute NaOH solution forming sodium hypochlorite which, similar to the Raschig process, is made to react with... 

MMHa.nd UDMH. MonomethyUiydrazine and yyz -dimethylhydrazine are manufactured by Olin Corp. using the same Raschig process and equipment employed for anhydrous hydrazine. Chloramine, prepared as described above, reacts with methylamine or dimethylamine instead of with... 

The estimated world production capacity for hydrazine solutions is 44,100 t on a N2H4 basis (Table 6). About 60% is made by the hypochlorite—ketazine process, 25% by the peroxide—ketazine route, and the remainder by the Raschig and urea processes. In addition there is anhydrous hydrazine capacity for propellant appHcations. In the United States, one plant dedicated to fuels production (Olin Corp., Raschig process), has a nominal capacity of 3200 t. This facihty also produces the two other hydrazine fuels, monomethyUiydrazine and unsymmetrical dimethyUiydrazine. Other hydrazine fuels capacity includes AH in the PRC, Japan, and Russia MMH in France and Japan and UDMH in France, Russia, and the PRC. 

Olin Raschig A refinement of the basic Raschig (1) process for making hydroxylamine. See Raschig (1). 

Commercial production of hydrazine from its elements has not been successful. However three processes are available for the commercial production of hydrazine 1) The Raschig Process, 2) The Raschig/Olin Process, 3) The Hoffmann (urea) Process, 4) Bayer Ketazine Process, and 5) the Peroxide process from Produits Chimiques Ugine Kuhlmann (of France). 

The Raschig process was discovered in 1907 and then modified into the Olin process. The chemical reactions take place in the liquid phase and involve three steps ... 

Raschig/Olin Process. The Raschig/Olin process is used to make anhydrous hydrazine. In this process Reactions (22-67) through (22-69) also occur. However the refining area has a different design from the Raschig process. Additional details are given in Reference 132. 

The Raschig/Olin process (see Figure 18.2) is used to make anhydrous hydrazine. In this process the NaOCl production occurs at a low temperature to prevent decomposition and chlorate formation. The excess NaOH is kept to a low level132. 

Figure 112. Raschig / Olin Process for Hydrazine Production (Reproduced by permission of Wiley-VCH)...

Fig. 22.27. Raschig/Olin process for hydrazine production. (Courtesy of Wiley-VCH. Schirmann, J.P, in Ullmann s Encyclopedia of Industrial Chemistry, Vol.A13, pp. 177-190, Reinhold Publishing, New York, 1996.)...

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