A New or Improved Process for the Recovery or Regeneration of Nitric Acid Employed in the Manufacture of Chlorine.
Year: 1889

page_text: Date of Application, 21st Oct., 1889
Complete Specification Left, 2nd June, 1890-Accepted, 5th July, 1890
PROVISIONAL SPECIFICATION.
A New or Improved Process for the Recovery or Regeneration of
Nitric Acid Employed in the Manufacture of Chlorine.
I WILHELM WOLTERS of 40 Moika St. Petersburg Doctor of Philosophy do hereby
declare the nature of this invention to be as follows:-
The process for manufacturing chlorine by the action of hydrochloric acid and
nitric acid upon manganic oxide has not heretofore obtained any commercial
importance owing to the want of a practical and efficacious method of recovering
or regenerating the nitric acid employed. It has been proposed to roast the
manganous nitrate formed and to convert the resulting red vapour (hyponitric acid)
into nitric acid by the action of air and water but with this method of proceeding a
considerable amount of waste is unavoidable.
The present invention relates to the recovery of the nitric acid employed in the
aforesaid chlorine process in a practical and effective manner by means of a
combination of operations hereinafter described.
The watery solution remaining after the acids have acted on the manganese super
oxide and containing the manganous nitrate with the unused nitric acid is subjected
to fractional distillation whereby the free nitric acid is driven off or distilled over
with the water. The several watery fractions or products of the distillation are
subsequently utilised as hereinafter explained. The nitrate of manganese sesqui oxide
remaining as the residue after distillation is decomposed by heating it in a current
of air or steam so that manganic oxide or sesqui oxide of manganese and hyponitric
are formed. The decomposing vessel must be heated as uniformly as possible,
preferably by means of a suitable heating bath. The hyponitric acid (red vapour) set
free in this decomposing process is then converted into nitric acid by the action of
air and of the less poor fractions resulting from the aforesaid distillation. The
poorer or weaker fractions are employed in the preparation of the hydrochloric acid
(which is to be decomposed in the process) for the condensation of the latter.
By means of the combination hereinbefore described the nitric acid is enabled to
be recovered along with the manganic oxide without any material waste and a
heretofore commercially impracticable process is thus rendered capable of being
profitably worked.
Dated this 21st day of October 1889
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION
A New or Improved Process for the Recovery or Regeneration of
Nitric Acid Employed in the Manufacture of Chlorine.
I, WILHELM WOLTERS, Doctor of Philosophy, residing at 40 Moika St. Petersburg,
Empire of Russia, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement :-
The process for manufacturing chlorine by the action of hydrochloric acid and
nitric acid upon manganic oxide has not heretofore obtained any commercial
importance owing to the want of a practical and efficacious method of recovering or
regenerating the nitric acid employed. It has been proposed to roast the manganous
nitrate formed and to convert the resulting red vapour (hyponitric acid) into nitric
acid by the action of air and water but with this method of proceeling a considerable
amount of waste is unavoidable. The present invention relates to the recovery of
[Price 4d.1

page_text: the nitric acid employed in the aforesaid chlorine process in a practical and effective
manner by means of a combination of operations hereinafter described.
The watery solution remaining after the acids have, acted on the manganese super-
oxide and containing the manganous nitrate with the unused nitric acid is subjected
to fractional distillation whereby the free nitric acid is driven off or distill over
with the water. The several watery fractions or products of the distillation are
subsequently utilised as hereinafter explained. The nitrate of manganese sesqui-oxide
remaining as the residue after distillation is decomposed by heating it in a current
of air or steam so that manganic oxide or sesqui oxide of manganese and hyponitric
acid are formed. The decomposing vessel must be heated as uniformly as possible
preferably by means of a suitable heating bath. The hyponitric acid (red vapour)
set free in this decomposing process is then converted into nitric acid by the action
of air and of the less poor fractions resulting from the aforesaid distillation. The
poorer or weaker fractions are employed in the preparation of the hydrochloric acid
(which is to be decomposed in the process) for the condensation of the latter.
By means of the combination hereinbefore described the nitric acid is enabled to
be recovered along with the manganic oxide without any material waste and a
heretofore commercially impracticable process is thus rendered capable of being
profitably worked.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is
The described improvement in the manufacture of chlorine by the action of
hydrochloric acid and nitric acid upon manganic oxide which consists in subjecting
to fractional distillation the watery solution which remains after the action of said
acids and which contains the manganous nitrate formed and the unused nitric acid,
in decomposing the residue of this distillation into manganic oxide and hyponitric
acid, and in employing the fractions obtained by said distillation for regenerating and
condensing the said hyponitric acid and for condensing the hydrochloric acid to be
decomposed by the process, all as and for the purpose described.
Dated the 31st day of May 1800
J. H. JOHNSON & Co.,
.Agents.