Soap-Making Manual: A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant.Thomssen, Edgar George
Science
Soap-Making Manual: A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant.
Thomssen, Edgar George
Soap
Marine soaps are manufactured by first placing in the kettle a
calculated amount of lye of 25 deg. to 35 deg. B., depending upon the
amount of moisture desired in the finished soaps, plus a slight excess
required to saponify a known weight of cocoanut oil. With open steam on,
the cocoanut oil is then gradually added, care being taken that the soap
does not froth over. Saponification takes place readily and when the oil
is entirely saponified the finished soap is put through the process
known as running. This consists in constantly pumping the mass from the
skimmer pipe back into the top of the kettle, the object being to
prevent any settling of the nigre or lye from the soap, as well as
producing a homogeneous mass. It is customary to begin the
saponification in the morning, which should be completed by noon. The
soap is then run for about three hours and framed the next morning.
After having remained in the frame the time required to solidify and
cool, the soap is slabbed and cut into cakes. This process is difficult
to carry out properly, and one not greatly employed, although large
quantities of marine soap are purchased by the government for use in the
navy and must fulfill certain specifications required by the purchasing
department.
In making potash soaps it is practically impossible to obtain any
glycerine directly because of the pasty consistency of the soap, and no
graining is possible because the addition of salt to a soft soap, as
already explained, would form a soda soap. Large quantities of soft
soaps are required for the textile industries who desire mostly a strong
potash soap, and the large number of automobiles in use at the present
time has opened a field for the use of a soft soap for washing these. A
soap for this purpose must be neutral so as not to affect the varnish or
paint of automobiles.
A suitable soap for textile purposes may be made as follows:
Red oil 80 parts
House grease 20 parts
Caustic soda lye, 36 degs. B. 3 parts
Carbonate of potash 5-1/2 parts
Caustic potash 23-1/4 parts
Olive oil, corn oil, soya bean oil, olive oil foots or cottonseed oil
may replace any of the above oils. A large quantity of cottonseed oil
will cause the soap to fig.
Public-domain text, read in full here on John Shaqi.
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