Title:
ニトロベンゼンの連続製造方法
Document Type and Number:
Japanese Patent JP2013535478
Kind Code:
A
Abstract:
The present invention relates to a continuous process for the production of nitrobenzene by nitration of benzene with nitric acid or mixtures of nitric acid and sulfuric acid to give a crude nitrobenzene, washing of the crude nitrobenzene by means of at least one of each of an acid, alkaline and neutral washing, there being obtained a pre-purified nitrobenzene which, as well as containing nitrobenzene, at least contains also low boilers, optionally middle boilers as well as high boilers and salts, wherein the pre-purified nitrobenzene is purified further by separating off low boilers in a distillation apparatus by evaporation of the low boilers, and separation of nitrobenzene from the resulting further purified nitrobenzene in a distillation apparatus by partial evaporation of nitrobenzene, wherein pure nitrobenzene is removed from the distillation apparatus in gaseous form and is subsequently condensed, and wherein the non-evaporated portion of the further purified nitrobenzene is fed back into the washing at any desired point.
Inventors:
Thomas Knauf
Michael Merkel
Andreas Karl Rausch
Peter Rehnel
Jürgen Munnig
Michael Merkel
Andreas Karl Rausch
Peter Rehnel
Jürgen Munnig
Application Number:
JP2013522200A
Publication Date:
September 12, 2013
Filing Date:
July 26, 2011
Export Citation:
Assignee:
Bayer Intellectual Property GmbH
International Classes:
C07C201/08; C07C201/16; C07C205/06; C07B61/00; C07C209/36; C07C211/46
Attorney, Agent or Firm:
Mitsuo Tanaka
Takuji Yamada
Kenichi Morizumi
Kajita Marina
Takuji Yamada
Kenichi Morizumi
Kajita Marina