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AssigneeSociete Nationale des Poudres et Explosifs
InventorsHelene M. Pascal, Jean-Marie L. Emeury
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The invention relates to a process for the separation of 2,4-dinitro-6-t-butyl-3-methylanisole, referred to as musk ambrette, from the crude mixtures in which it is present, which are obtained by nitrating 6-t-butyl-3-methylanisole. According to the invention, an amount of water representing from 5 to 40% by weight of the nitrating mixture used in the synthesis is introduced onto the crude synthesis mixture in a first addition, the pure musk ambrette obtained is collected and several small amounts of water, representing from 1 to 15% by weight of the said nitrating mixture used, are then introduced, the precipitated product being collected between each addition. The process makes it possible to collect, in a pure form and without the use of an organic extraction solvent, about three quarters of the musk ambrette present in the crude synthesis mixture.
Process for the separation of 2,4-dinitro-6-t-butyl-3-methylanisole from the crude reaction mixtures obtained by nitrating 6-t-butyl-3 -methylanisole by reaction with a mixture of nitric acid and acetic anhydride wherein water is introduced into the crude reaction mixture in the amount of at least 5% and at most 200% by weight of the nitrating mixture used in the process, in at least two additions, each addition of water containing no more than 100% by weight of the said nitrating mixture, and prior to each introduction of water, the precipitated product is separated off.
Dependencies are inferred from the claim text.