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Optimum kinetic and gas hold up distribution study in an NDMA hydrogenation reactor

Gorji, M ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: 2008
  3. Abstract:
  4. Unsymmetrical Dimethyl hydrazine (UDMH) is used as stabilizer, fuel promoter, chemical in photography, and liquid fuel for fighter jet engines. Catalytic liquid phase hydrogenation of nitrosodimethylamine (NDMA) is one of the most efficient methods for the production of UDMH. Hydrogenation of NDMA to UDMH using a commercial 5% Pd/C catalyst in aqueous solution of NDMA was studied under constant temperature at 40°-70°C, ≤ 15 bar, and NDMA concentrations of 40-70 wt %. The effects of temperature, pressure, and NDMA concentration on NDMA conversion and yield of UDMH product in presence of undesired Dimethylamine (DMA) were studied. At NDMA concentration of > 50 wt %, the UDMH yield was < 0.89, while the best NDMA concentration was between 40 and 50 wt %. At > 50°C, the UDMH yield was < 0.91 and the best temperature range was 40°-50°C. As the hydrogen inlet velocity increased, better gas distribution was obtained throughout the liquid. Consequently, the increase in gas inlet velocity beyond a certain threshold deteriorated the gas distribution in the liquid. This is an abstract of a paper presented at the 18th International Congress of Chemical and Process Engineering (Prague, Czech Republic 8/24-28/2008)
  5. Keywords:
  6. Impellers ; Rotor Blades (Turbomachinery) ; Agitators
  7. Source: 18th International Congress of Chemical and Process Engineering, CHISA 2008, Prague, 24 August 2008 through 28 August 2008 ; 2008