IMPROVEMENTS IN OBTAINING HYDROCHLORIC ACID GAS FROM A SOLUTION OF HYDROCHLORIC ACID to be as follows
Year: 1884

page_text: I, WILLIAM LLOYD WISE, of 46 Lincolns Inn Fields, in the County of Middlesex,
Consulting Engineer and Patent Agent, do hereby declare the nature of said
invention for "IMPROVEMENTS IN OBTAINING HYDROCHLORIC ACID GAS FROM A
SOLUTION OF HYDROCHLORIC ACID to be as follows:-
"
In the specification of Letters Patent granted to Mr Ernest Solvay dated' the
25th of February 1880 N° 837 he describes the employment of chloride of calcium
for separating hydrochloric acid gas from a solution of this acid and more
generally for obtaining pure hydrochloric acid gas from a mixture of it with other
gases after previous condensation.
This process can be carried out in various ways according to circumstances but
ordinarily it is preferred to operate as follows. There is prepared a concentrated
solution of chloride of calcium heated nearly to its boiling point and into this is
introduced the solution of hydrochloric acid in water (which may be pure or may
hold chloride of calcium or, other salts in solution) in such quantity that the
temperature of the mixed liquids does not fall below 100° C. A solution of
chloride of calcium boiling between 150° and 160° C. answers very well. The
hydrochloric acid is given off in the gaseous form and the water in which it was
dissolved is held back by the chloride of calcium. Agitation produced by
mechanical means, or by passing the mixed liquid through an apparatus which
repeatedly divides it into fine streams or by blowing air through the mixed liquid,
facilitates the disengagement of the hydrochloric acid very much.
The operation can be made continuous by passing through an apparatus divided
into several compartments a continuous current of a hot concentrated solution of
chloride of calcium and at the same time such a quantity of liquid hydrochloric
acid as it is capable of decomposing. A continuous current of hydrochloric acid
gas is thus obtained and the solution of chloride of calcium leaves the apparatus
practically free from hydrochloric acid.

page_text: In order to neutralize the small quantity of this acid remaining, a little lime or
carbonate of limo is added and then the solution is concentrated by evaporation
and again used for the same purpose as before. In the case where the agitation of
the mixed liquid is produced by blowing in a current of air, the quantity of air
can be so regulated as to obtain a mixture of hydrochloric acid gas and air suitable
for the production of chlorine by the process known as Deacon's process or any
process similar to it.
I, WILLIAM LLOYD WISE, of 46 Lincolns Inn Fields, in the County of Middlesex,
Consulting Engineer and Patent Agent do hereby declare the nature of said
invention for "IMPROVEMENTS IN ORTAINING HYDROCHLORIC ACID GAS FROM A
SOLUTION OF HYDROCHLORIC ACID" and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
In the specification of Letters Patent granted to Ernest Solvay dated the
25th of February 1880 No 837 he describes the employment of chloride of calcium
for separating hydrochloric acid gas from a solution of this acid and more generally
for obtaining pure hydrochloric acid gas from a mixture of it with other gases
after previous condensation.
This process can be carried out in various ways according to circumstances but
ordinarily it is preferred to operate as follows:-Thore is propared a concentrated
solution of chloride of calcium heated nearly to its boiling point and into this is
introduced the solution of hydrochloric acid in water (which may ho pure or may
hold chloride of calcium or other salts in solution) in such quantity that the
tomperature of the mixed liquids does not fall below 100° C. A solution of chloride
of calcium boiling between 150° and 160° C. answera very well. The hydrochloric
acid is given off in the gaseous form and the water in which it was dissolved is
held back by the chloride of calcium. Agitation produced by mechanical means,
or by passing the mixed liquid through an apparatus which repeatedly divides it
into fine streams or by blowing air through the mixed liquid, facilitates the
disengagement of the hydrochloric acid very much.

page_text: The operation can be made continuous by passing through an apparatus divided
into several compartments a current of a hot solution of chloride of calcium and ab
the same time such a quantity of liquid hydrochloric acid as it is capable of
decomposing.
A continuous current of hydrochloric acid gas is thus obtained and the solution
of chloride of calcium leaves the apparatus pratically free from hydrochloric acid.
In order to neutralize the small quantity of this acid remaining a little lime or
carbonate of lime is added and then the solution is concentrated by evaporation
and again used for the same purpose as before. In the case where the agitation of
the mixture and of the two liquids is produced by blowing in a current of air, the
quantity of air can be so regulated as to obtain a mixture of hydrochloric acid gas
and air suitable for the production of chlorine by the process known as Deacon's
process or any process similar to it.
Having now particularly described and ascertained the nature of the said
iuvention and in what manner the same is to be perforined I declare that what
I claim is
In the process for obtaining hydrochloric acid gas from solutions of hydrochloric
acid by means of chloride of calcium, the introduction of the solution of hydro-
chloric acid into a hot concentrated solution of chloride of calcium substantially as
hereinbefore described.