Raschig_hydroxylamine_process

Raschig hydroxylamine process

Raschig hydroxylamine process

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The Raschig process for the production of hydroxylamine is one of three chemical processes developed by German chemist Friedrich Raschig. The main step in this process, patented by Raschig in 1887, is the reduction of nitrite with bisulfite towards hydroxylamine disulfonate, which is hydrolysed to hydroxylammonium sulfate.[1][2] Most of the hydroxylamine produced is used in the manufacture of caprolactam, the precursor to the polymer Nylon 6.[3]

The commercially used Raschig process consists of the following steps:[3]

References

  1. [1]
    DE patent 41987, Friedrich Raschig, "Verfahren zur Darstellung der hydroxylamindisulfonsauren Alkalisalze und von Hydroxylamin aus letzteren.", issued 1887-01-22
  2. [2]
    Oblath, S. B.; Markowitz, S. S.; Novakov, T.; Chang, S. G. (December 1982). "Kinetics of the initial reaction of nitrite ion in bisulfite solutions". The Journal of Physical Chemistry. 86 (25): 4853–4857. doi:10.1021/j100222a005.
  3. [3]
    Ritz, Josef; Fuchs, Hugo; Perryman, Howard G. (2000). "Hydroxylamine". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a13_527. ISBN 3527306730.


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