IMPROVEMENTS IN THE PURIFICATION OF GAS AND IN OBTAINING CERTAIN USEFUL PRODUCTS THEREFROM
Year: 1862

page_text: LETTERS PATENT to Edward Marriott, of Miles Platting, Manchester, in
the County of Lancaster, Manufacturing Chemist, and Samuel Holroyd,
of Manchester aforesaid, Manufacturing Chemist, for the Invention. of
"IMPROVEMENTS IN THE PURIFICATION OF GAS AND IN OBTAINING CERTAIN
USEFUL PRODUCTS THEREFROM."
Sealed the 8th May 1863, and dated the 11th November 1862.
PROVISIONAL SPECIFICATION left by the' said Edward Marriott and
Samuel Holroyd at the Office of the Commissioners of Patents, with
their Petition, on the 11th November 1862.
We, EDWARD MARRIOTT, of Miles Platting, Manchester, in the County of
Lancaster, Manufacturing Chemist, and SAMUEL HOLROYD, of Manchester
aforesaid, Manufacturing, Chemist, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE PURIFICATION OF GAS AND IN OBTAINING.
CERTAIN USEFUL PRODUCTS THEREFROM," to be as follows:-
Our Invention consists, firstly, in purifying gas by the use of sulphate,
chloride, or other salt of iron in combination with ammonia, and in carrying
out this part of our Invention we can derive the ammonia from ammoniacal
gas water.
Secondly, we treat the gas with sulphide of iron, either alone or in com--
bination with other purifying substances..

page_text: In carrying out the first of these processes we gain as products sulphate of
ammonia, compounds of cyanogen, and sulphide of iron, the last of which we
use for the second part of our Invention.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Edward Marriott and Samuel Holroyd in the Great Seal
Patent Office on the 11th May 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, EDWARD
MARRIOTT, of Miles Platting, Manchester, in the County of Lancaster,
Manufacturing Chemist, and SAMUEL HOLROYD, of Manchester aforesaid,
Manufacturing Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eleventh day of November, in the year of our
Lord One thousand eight hundred and sixty-two, in the twenty-sixth year
of Her reign, did, for Herself, Her heirs and successors, give and grant unto
us, the said Edward Marriott and Samuel Holroyd, Her special license, that
we, the said Edward Marriott and Samuel Holroyd, our executors, adminis-
trators, and assigns, or such others as we, the said Edward Marriott and
Samuel Holroyd, our executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times there-
after during the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
THE PURIFICATION OF GAS AND IN OBTAINING CERTAIN USEFUL PRODUCTS THERE-
FROM," upon the condition, amongst others, that we, the said. Edward Marriott
and Samuel Holroyd, by an instrument in writing under our hands and
seals, (or under the hand and seal of one of us,) should particularly describe
and ascertain the nature of the said Invention, and in what manner the same
was to be performed, and cause the same to be filed in the Great Seal. Patent
Office within six calendar months next and immediately after the date of the
said Letters Patent.
:
.
NOW KNOW. YE; that we, the said Edward Marriott. and Samuel
Holroyd, do hereby declare the nature of our said Invention, and in what
manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement (that is to say) :-
2
In purifying gas we use a combination of sulphate of iron with ammonia,
and in carrying out this part of our Invention we take ammoniacal gas liquor,

page_text: and add a solution of iron, so as to precipitate all the sulphides and leave a
'slight excess of iron. This excess, however, must not be sufficient to neutralize
all the ammonia present, but must leave the solution with a decided alkaline
reaction. The quantity of iron to be added will vary with the composition of
the gas liquor, but the fact of all the sulphides having been precipitated: will
be readily ascertained by test in the usual manner. The solution thus obtained
we use by pumping it continuously through the ordinary "gas scrubbers;" but
'as the iron will become decomposed during the process of purification, small
quantities must from time to time be added. The necessity for such addition
may be ascertained by the character of the gas as it passes off; if it be foul,
more iron is then required, just after the same manner as the condition of the
ordinary lime purifiers is ascertained.
:
>
We have in the above description mentioned our Invention as carried out
by the use of ammonia derived from ammoniacal gas liquor, but it will be
evident that ammonia from other sources may be employed, or that other
alkalies, as soda, potash, or alkaline salts will operate after the same manner.
Ve. would also observe that, instead of the sulphate of iron, the chloride, or
other soluble salt of iron economical enough for the process, may be
employed:
We
=
Secondly, our Invention consists sin treating the gas with
sulphuret of iron, and this necessarily takes place in carrying out the price of
1.
first part
of our improvements; our Invention, however, also consists in the use of
sulphide or sulphuret of iron derived from other sources for purifying gas
either in the wet or the dry way. If in the former, we procure sulphide or
sulphuret of iron obtained by any usual process, bring it into a state of fine
division, and mix it with water, in which it becomes suspended; through this
mixture the gas is passed by any convenient arrangement of pipes. For the
dry way, we mix the sulphide or sulphuret of iron with sawdust, pieces of coke,
or other material which will make a porous mass, and through which the gas
may be passed. In carrying out this part of our Invention, we, however,
adopt a special method for obtaining the sulphide or sulphuret of iron, that is
to say, we treat the lime which has been used in ordinary lime purifiers for
purifying gas with sulphate of iron, whereby the sulphide is produced, and the
said lime may again be used in the ordinary manner. This application of the
sulphate of iron may be made without removing the lime from the purifiers, or
such removal may take place if found necessary. In effecting this process
care must of course be taken to apply the solution of sulphate of iron by
sprinkling only or other moderate use, so as to prevent the lime from becoming
too pasty.

page_text: In carrying out the first part of our Invention, we gain as bye products
sulphate.of ammonia, compounds of cyanogen, and sulphide of iron, which may
be used for manure, for obtaining sulphur, or for other ordinary purpose.
Having thus described and ascertained; the nature of our said Invention, and
the method of carrying the same into effect, we desire it to be understood that
we claim as secured to us under the above in part recited Letters Patent, and
for the purpose above set forth :-..
Firstly, the combined use of sulphate, or other salt of iron and ammonia, or
other alkáli or alkaline salt.
Secondly, the use of sulphide or sulphuret of iron..
Thirdly, obtaining the above-named bye products by the aforesaid pro-
cesses.
In witness whereof, we, the said Edward Marriott and Samuel Holroyd,
...
have hereunto set our hands and seals, this Ninth day of May,
One thousand eight hundred and sixty-three..