![]() La base légale du traitement est l’exécution de mesures précontractuelles. Les informations recueillies sur ce formulaire sont enregistrées dans un fichier informatisé par De Dietrich pour entrer en contact avec vous suite à votre candidature. De Dietrich Process Systems has optimized each step and their combination for decades and has patents reducing the energy consumption. The flow chart shows the complex integration of the process steps:Įach step has an impact on the others and hence on the overall efficiency of the process. The content of NOx in the vent gas can be reduced down to less than 100ppm. The stripped NOx gases are sent to an aqueous absorption column and there converted with air under pressure to 50 - 65wt% nitric acid. The diluted sulphuric acid is reconcentrated in a sulfuric acid concentration system being part of the nitric acid concentration plant.The concentrated nitric acid containing NOx is stripped with air in a so called bleaching column K2 giving a clear nitric acid of up to 99,8wt%. The pre-concentrated nitric acid is then concentred by a extractive rectification with sulfuric acid in column K1 providing high concentrated nitric acid, NOx and diluted sulfuric acid. This rectification can be done at ambient pressure with the pre-concentrated nitric acid leaving the column at the bottom and the water at the top of the column. It is therefore advantageous to pre-concentrate the weak nitric acid by simple rectification up to a value close to 68wt%. ![]()
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