IMPROVEMENTS IN REGENERATING SULPHUR FROM ALKALI WASTE
Year: 1882

page_text: LETTERS PATENT to Walter Weldon, of Rede Hall, Burstow, in the County
of Surrey, for an Invention of IMPROVEMENTS IN REGENERATING SULPHUR
FROM ALKALI WASTE
PROVISIONAL SPECIFICATION left by the said Walter Weldon at the Office
of the Commissioners of Patents on the 2nd October 1882.
WALTER WELDON, of Rede Hall, Burstow, in the County of Surrey,
"IMPROVEMENTS IN REGENERATING SULPHUR FROM ALKALI WASTE"
This invention consists in heating alkali waste with water under pressure, so as
to convert the calcium sulphide of the alkali waste partly into calcium hydrate and
partly into calcium sulphydrate, by the reaction:
2 Ca S + 2 H2O = Ca H, O₂ + Ca H, S₂,
in then separating the solution of calcium sulphydrate so obtained from the solid
bodies which are at first present with it, and in then decomposing the said solution
of calcium sulphydrate either by bydrochloric acid or by carbonic acid. The
greater portion of the sulphur of the alkali waste is thus obtained as sulphuretted
hydrogen, which I then utilize either by the now well-known Schaffner and
Helbig method, or by burning it wholly into sulphurous acid, or by absorbing it by
oxide of iron, either in the wet way or the dry way, or by any of the known
methods of treating that body.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Walter Weldon in the Great Seal Patent Office on the 28th
March 1883.
WALTER WELDON, of Rede Hall, Burstow, in the County of Surrey,
"IMPROVEMENTS IN REGENERATING SULPHUR FROM ALKALI WASTE,"
This invention consists in heating alkali-waste with water under pressure, so as
to convert the calcium sulphide of the alkali-waste partly into calcium hydrate and
partly into calcium sulphydrate, by the reaction:
2 Ca S2 H, O = Ca H, O₂+ Ca H₂ S₂,
2
in then separating the solution of calcium sulphydrate so obtained from the solid
bodies which are at first present with it, and in then decomposing the said solution
of calcium sulphydrate either by hydrochloric acid or by carbonic acid. The
greater portion of the sulphur of the alkali-waste is thus obtained as sulphuretted
hydrogen, which I then utilize either by the now well-known Schaffner and Helbig
method, or by burning it wholly into sulphurous acid, or by absorbing it by oxide
of iron, either in the wet way or the dry way, or by any of the known methods of
treating that body.
The heating under pressure of the mixture of alkali-waste and water should
preferably be performed in vessels furnished with mechanical agitators, which
should be kept in motion while such heating is going on.
The filtration of the
product, and the treatment of the liquid part of it by hydrochloric acid or carbonic
acid, can be performed in any one of a variety of known ways, which will be well
understood by those who are familiar with such operations
What I desire to claim as the invention to be secured by the hereinbefore in part
recited Letters Patent is the method of obtaining from alkali-waste sulphur in the
state of sulphuretted hydrogen, which method consists in combining the treatment
of alkali-waste by water under pressure with the decomposition of the resulting
solution of calcium sulpbydrate by either hydrochloric acid or carbonic acid.
In witness whereof I, the said Walter Weldon have hereunto set my hand
and seal this thirteenth day of March in the year of Our Lord One thousand
eight hundred and eighty three.