IMPROVEMENTS IN FILTERING SACCHARINE AND OTHER LIKE SOLUTIONS AND MIXTURES
Year: 1883

page_text: "
LETTERS PATENT to Edwin Powley Alexander of 36 Southampton Buildings
in the County of Middlesex, Fellow of the Institute of Patent Agents for an
Invention of IMPROVEMENTS IN FILTERING SACCHARINE AND OTHER LIKE
SOLUTIONS AND MIXTURES Communicated to him from abroad by Paul
Casamajor of Brooklyn, Kings County, New York in the United States of
America
"
PROVISIONAL SPECIFICATION left by the said Edwin Powley Alexander
at the Office of the Commissioners of Patents on the 16th January 1883.
EDWIN POWLEY ALEXANDER of 36 Southampton Buildings in the County of
Middlesex, Fellow of the Institute of Patent Agents "IMPROVEMENTS IN FILTERING
SACCHARINE AND OTHER LIKE SOLUTIONS AND MIXTURES "
a communication to ine
from abroad by Paul Casamajor of Brooklyn, Kings County New York, in the
United States of America,
This invention relates to the filtering of saccharine solutions and of other liquids,
holding in suspension such solid matters as form deposits on filtering surfaces and
which in ordinary modes of filtering clog and obstruct such surfaces in a very short
time and consists in mixing the liquid to be filtered with a quantity of saw-dust
and then filtering the liquid so mixed through sieves, fabrics or other filtering
materials.
I am aware that it has been proposed to mix charcoal with viscid matters to
facilitate filtering-but the present invention is attended with the greater advan-
tage of cheapness in the material used and in the recovery of the saw-dust for
subsequent like operations by washing it with water over a sieve of too fine a mesh
to permit the passage of saw-dust. Particles of sand and heavy matters may be
extracted by settling-chips and large particles can be sieved out. A much less
per centage of saw-dust than of charcoal is required to effect the same result.
Liquids treated as above can be forced through filter presses and other filters
working under pressure.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Edwin Powley Alexander in the Great Seal Patent Office on the
12th July 1883.
"
EDWIN POWLEY ALEXANDER of 36 Southampton Buildings in the County of
Middlesex, Fellow of the Institute of Patent Agents. "IMPROVEMENTS IN FILTERING 5
SACCHARINE AND OTHER LIKE SOLUTIONS AND MIXTURES A communication to
me from abroad by Paul Casamajor of Brooklyn Kings County Now York in the
United States of America
The said invention relates to the filtering of saccharine solutions and of other
liquids holding in suspension such solid matters as form deposits on filtering surfaces 1
and which in ordinary modes of filtering clog and obstruct such surfaces in a very
short time.
To filter liquids of this nature very extensive filtering surfaces are required.
Liquids are often filtered under high pressure as is the case in using filter presses
but this cannot be done with liquids of the class mentioned above as increased 1
pressure with such liquids is powerless to increase filtration to any marked degree.
To filter liquids of this class with limited filtering surface they are mixed
thoroughly with a certain amount of saw-dust (or woody matter in a comminuted
state) which so changes the nature of the deposit on the filtering surfaces that the
latter do not become quickly clogged and obstructed and allow of the filtration of 2
an increased quantity of liquid.
The saw dust wood raspings ground wood or other comminuted woody material
is first thoroughly cleansed by boiling in hot water, by treating with chemicals, or
otherwise removing the volatile and extractive portions, is then washed and soaked
in clean water and about two per cent of this is added to the ordinary solution 2
which is then forced through the cloth in the press as usual or is poured into a box
having a bottom sieve of fabric wire cloth or perforated plate or it may be extracted
by centrifugal action.
Whatever may be the means employed it has been found that the mixing of saw
dust with the liquid and subsequent separation greatly facilitate the extraction of 3
foreign particles and permits the removal of all foreign matters with great rapidity
and most effectually.
I am aware that it has been proposed to mix charcoal with viscid matters to
facilitate filtering but the present invention is attended with the greater advantage
of cheapness in the material used and in the recovery of the saw-dust for subse- 3
quent liko oporations by washing it with water over a sieve of too fine a mesh to
permit the passage of saw dust.. Particles of sand and heavy matters may be
extracted by settling-chips and large particles can be sieved out.
A much less percentage of saw dust than of charcoal is required to effect the
same result.
Liquids treated as above can be forced through filter presses and other filters
working under pressure.
Having now described and particularly ascertained the nature of the said inven-
tion and the manner in which the same is or may be used or carried into effect I'
would observe in conclusion that what I consider to be novel and original and
therefore claim as the invention secured to me by the hereinbefore in part recited
Letters Patent is :-
The within described improvements in filtering liquids, the same consisting in

page_text: mixing the liquid to be filtered with a quantity of saw-dust and then filtering the
liquid so mixed through sieves fabrics or other filtering materials substantially as
set forth.
In witness whereof I the said Edwin Powley Alexander have hereunto set
my hand and seal this tenth day of July in the year of our Lord one
thousand eight hundred and eighty three.