Improvements in the Manufacture and Production of Dry Soap, or Soap Powder.
Year: 1896

page_text: Date of Application, 16th Oct., 1896
Complete Specification Left, 9th July, 1897--Accepted, 28th Aug., 1897
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture and Production of Dry Soap,
or Soap Powder.
We, FREDERICK WILLIAM WRIGHT Chemist, and THE UNITED ALKALI COMPANY
LIMITED, both of G 11 Exchange Buildings Liverpool, in the County of Lancaster do
hereby declare the nature of this Invention to be as follows:-
Dry soap or soap powder is usually manufactured by heating together soda
crystals and ordinary soap and then adding to the liquid mixture finely ground
bicarbonate of soda, or anhydrous mono-carbonate of soda or both.
According to this Invention dry soap or soap powder, is made by intimately mixing
ordinary soap with the wet crude bicarbonate of soda obtained in the Ammonia-soda
process. This crude bicarbonate of soda is much cheaper than either soda crystals, or
bicarbonate of soda, and it contains sufficient water to dissolve the requisite quantity
of soap. To this mixture of crude bicarbonate of soda and soap we add anhydrous
mono-carbonate of soda, which combines with the excess of water of the mixture of
soap and crude bicarbonate, and thus dries the soap.
Instead of drying the soap by the addition of anhydrous mono-carbonate of soda,
we may dry it by gently heating the mixture, whereby the water, some ammonia
(which is always contained in the crude bicarbonate from the Ammonia-soda process)
and some carbonic acid are driven off. It is desirable that the temperature during
this process of drying should not rise above 240° Fahrenheit. The "roasters
usually employed for roasting the crude bicarbonate of soda in Ammonia Soda Works
are suitable for this drying. The "dry soap" or soap powder produced as aforesaid
and by whichever mode it has been dried is finely ground and is then ready for the
market.
Dated this 10th day of October 1906.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in the Manufacture and Production of Dry Soap,
or Soap Powder.
We, FREDERICK WILLIAM WRIGHT, Chemist, and THE UNITED ALKALI COMPANY
LIMITED, both of G 11 Exchange Buildings, Liverpool, in the County of Lancaster, do
hereby declare the nature of this Invention and in what manner the saine is to be
CD 973

page_text: performed to be particularly described and ascertained in and by the following
statement :-
Dry soap, or soap powder, is usually manufactured by heating together soda
crystals and ordinary soap and then adding to the liquid mixture finely ground
bicarbonate of soda, or anhydrous mono-carbonate of soda, or both.
According to this Invention dry soap, or soap powder, is made by intimately
mixing ordinary soap with the wet crude bicarbonate of soda obtained in the
Ammonia-soda process. This crude bicarbonate of soda is much cheaper than either
soda crystals, or the ordinary bicarbonate of soda, of commerce, and it contains
sufficient water to absorb the requisite quantity of soap. The said crude bicarbonate
usually contains from 30 to 35 per cent. of water. Should it he too dry, water to
make up this amount should be added. To this mixture of crude bicarbonate of
soda and soap we add anhydrous monocarbonate of soda, which combines with the
excess of water of the mixture of soap and crude bicarbonate and thus dries the
soap.
The mixture of soap and crude bicarbonate of soda can be prepared by grinding
these ingredients in an ordinary mortar, or other suitable mill, and then adding
gradually the anhydrous monocarbonate of soda (soda ash). We do not confine
ourselves to any special proportions as these may be varied within very wide limits,
but we find that a dry soap of good quality can be obtained by grinding together
about one part by weight of ordinary soap and three parts by weight of crude
bicarbonate of soda and when these are properly mixed, adding soda ash in sufficient
quantity to dry the mixture. With the above quantities two parts by weight of
soda ash are usually sufficient.
Instead of drying the soap by the addition of anhydrous monocarbonate of soda,
we may dry it by gently heating the ground mixture of crude bicarbonate and soap,
whereby water, some ammonia (which is always contained in the crude bicarbonate
from the Ammonia-seda process) and some carbonic acid are driven off. It is
desirable that the temperature during this process of drying should not exceed
212° Fahrenheit and in any case it shouki not rise above 240° Fahrenheit.
Apparatus similar to the "roasters" usually employed for roasting the crude
bicarbonate of soda in Ammonia-soda Works is suitable for this drying operation.
The "dry soap," or soap powder, produced as aforesaid, by whichever mode it has
been dried, is finely ground and dressed (passed through sieves) and packed ready
for the market.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that
what we claim is :-
The manufacture of "dry soap," or soap powder, by mixing crude bicarbonate of
soda such as is obtained in the ammonia-soda process, with ordinary soap, and then
drying the mixture either by the addition of anhydrous monocarbonate of soda, or by
gently heating, it substantially as hereinbefore described.
Dated this 9th day of July 1897.