Improvements in the Manufacture of Nitric Acid.
Year: 1893

page_text: Date of Application, 4th Apr., 1893
Complete Specification Left, 11th Sept., 1893-Accepted, 14th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Nitric Acid.
I, MANNING PRENTICE of Woodfield Stowmarket in the County of Suffolk
Manufacturing Chemist do hereby declare the nature of this invention to be as
follows:-
My invention has for its object to manufacture nitric acid by a continuous process
instead of by the intermittent process hitherto employed for the purpose.
According to my invention I provide a still, or vessel in which the nitrate and
acid are subjected to heat, the said still or vessel being provided with an inlet for
the admission of the nitrate and acid and a syphon or other suitable outlet for the
sulphate, nitrecake or other residue and an outlet or outlets for the nitric acid from
above the fluid mixture passing through the said still or vessel
may divide the
still, or vessel, into separate compartments or into a number of separate chambers
distinct from each other as regards the portions above the fluid mixture undergoing
distillation, but communicating with each other at their lower parts so that the
nitrate and acid pass, continuously or intermittently, by the inlet therefor, into the
first compartment or chamber, and thence into the succeeding compartment or
chamber, or compartments or chambers the sulphate or other residue passing off by
the outlet whilst the nitric acid, distilled off from each compartment, or chamber, is
led off by the outlet therefor provided from each compartment or chamber.
Dated this 4th day of April 1893.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Nitric Acid.
I MANNING PRENTICE of Woodfield Stowmarket in the County of Suffolk
Manufacturing Chemist 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 :-
My invention has for its object to manufacture nitric acid by a continuous
process instead of by the intermittent process hitherto employed for the purpose.
According to my invention I provide a still or vessel, in which the nitrate and
acid are subjected to heat, the said still, or vessel being provided with an inlet for
the admission of the nitrate and acid and a syphon, or other suitable outlet, for the
sulphate, nitrecake, or other residue and an outlet, or outlets, for the nitric acid
from above the fluid mixture passing through the said still, or vessel.
I may divide
the still, or vessel, into separate compartments, or into a number of separate
chambers distinct from each other as regards the portions above the fluid mixture
undergoing distillation, but communicating with each other at their lower parts so
that the nitrate and acid pass, continuously, or intermittently, by the inlet therefor,
into the first compartment, or chamber, and thence into the succeeding compartment,
or chamber, or compartments, or chambers, the sulphate or other residue passing
off by the outlet whilst the nitric acid, distilled off from each compartment, or
chamber, is let off by the outlet therefor provided from each compartment, or
chamber. I do not limit myself to a particular construction of apparatus in which
to carry out my invention but an apparatus such as is described in the Specification
of my application for Letters Patent No. 6959 of 1893 of even date herewith is

page_text: suitable for the purpose but it may for this purpose be without the partitions for
the separation of its interior into different compartments.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The manufacture of nitric acid by causing nitrate and acid to flow through a
still or vessel whilst it is subjected to the distillatory process.
Dated this 11th day of September 1893
J. H. JOHNSON & Co.,
Agents.