The Manufacture of Dye Matters from Red Sanderswood and Certain other Woods.
Year: 1887

page_text: Date of Application, 20th Jan, 1887.
Complete Left, 20th Sept., 1887
Complete Accepted, 21st Oct., 1887
PROVISIONAL SPECIFICATION.
The Manufacture of Dye Matters from Red Sanderswood and
Certain other Woods.
I GEORGE THOMAS, of the firm of George Thomas and Company, of 28 Deansgate,
Manchester, in the County of Lancaster, Engineer, do hereby declare the nature of
said Invention for THE MANUFACTURE OF DYE MATTERS FROM RED SANDERSWOOD AND
CERTAIN OTHER WOODS which Invention has been communicated to me from abroad by
Dr. Albert Zander of Königsberg, Prussia, Chemist, to be as follows:-
This invention relates to the extraction from red sanderswood, coliaturwood, and
certain other woods used for dyeing purposes of the santaline or colouring principle
contained in such woods and to the manufacture from this santaline extract of a dye
matter readily soluble in water.
Prior to this Invention the process of dyeing with these dyewoods had to be carried
out in the following or a similar manner: The materials to be dyed were brought
into immediate contact with the dyewood very finely ground into a powder on account
of the santaline or dye matter being absolutely insoluble both in hot and cold water.
After dyeing the wood dust had to be removed by beating thus rendering the process
tedious and costly and unavailable for some materials, such as silk for instance.
The santaline dye matter manufactured according to this Invention is readily soluble
in water and may be used in the same way, as for example, the coal tar dyes.
In carrying out this said Invention the santaline or dye matter is extracted from the
dyewood by treating the red sanderswood, coliaturwood or other dyewood with a
solution, preferably a warm solution, of Caustic Soda, Soda, Bicarbonate of Soda,
Borate, or Phosphate of Soda, or other soda salt or the corresponding potash
compounds. From this solution the santaline or dye matter which is insoluble in
water is precipitated by adding the necessary amount of Acid then filtering and
drying the precipitate. The santaline or dye matter thus obtained which is still
insoluble in water, either hot or cold, is treated with vitriol monhydrate, or fuming
sulphuric Acid thus converting the santaline into a sulphoacid readily soluble in water.
The mixture of the sulphoacid and the excess of acid is then poured into a cold
concentrated solution of common salt which precipitates the sulphoacid, the precipitate
being then filtered and dried.

page_text: COMPLETE SPECIFICATION.
The Manufacture of Dye Matters from Red Sanderswood and
Certain other Woods.
1 GEORGE THOMAS of the firm of George Thomas & Coy. of 28 Deansgate
Manchester in the County of Lancaster Engineer do hereby declare the nature of said
Invention for THE MANUFACTURE OF DYE MATTERS FROM RED SANDERSWOOD AND
CERTAIN OTHER WOODS which Invention has been communicated to me from abroad by
Dr. Albert Zander of Konigsberg Prussia Chemist, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to the manufacture of a dye matter readily soluble in water
from the santaline or colouring principle of red Sanderswood Caliaturwood Camwood
or Barwood and certain other woods used for dyeing purposes.
Prior to this Invention the process of dyeing with these dyewoods had to be carried
out in the following or a similar manner :- -The materials to be dyed were brought
into immediate contact with the dyewood very finely ground into a powder on account
of the santaline or dye matter being insoluble both in hot and cold water.
dyeing the wood dust had to be removed by beating thus rendering the process tedious
and costly and unavailable for some materials such as silk for instance.
After
The dye matter manufactured according to this Invention is readily soluble in water
and may be used in the same way as for example the coal tar dyes.
In carrying out this said Invention the santaline or dye matter may be extracted
from the red sanderswood or other dyewood by means of Methylated Spirit or it may
he extracted by treating the dyewood with a solution preferably a warm solution of
Caustic Soda, Soda, Bicarbonate of Soda, Borate or Phosphate of Soda, or other Soda
Salt or the corresponding Potash compounds. From this solution the santaline or
dye matter which is soluble in Alkaline solutions but insoluble in cold or hot water or
weak Acids is precipitated by adding the necessary amount of Acid then filtering and
drying the precipitate. The santaline or dyo matter thus obtained which is still
insoluble in water is treated with Vitriol, Monhydrate or fuming Sulphuric Acid thus
converting the santaline or dye matter into a compound readily soluble in water either
hot or cold.
As an example I may state that in practice very good results are obtained by mixing
one part dried precipitate of santaline or dye matter with six parts of Vitriol at a
strength of about 170 degrees Twaddell or 66 degrees Beaumé and keeping the
mixture at a temperature of 35 to 45 degrees Centrigrade until a sample diluted with
water gives a clear solution or if instead of the Vitriol I employ fuming Sulphuric
Acid containing about ten per cent. free Anhydrous Sulphuric Acid (SO3) I mix one
part of the precipitate with about four parts of the Acid and keep it at a temperature
of about 10 to 20 degrees Centigrade until a sample when tested as above described
shows that all the santaline or dye matter has become soluble. I would have it clearly

page_text: understood however that I do not limit myself to the foregoing examples as other
proportions and Acids of other degrees of strength or concentration may be used if
proper care be taken to lower the temperature in mixing the santaline extract or
precipitate and the Acid relatively to the increase in the strength or concentration of
the Acid employed.
The mixture of the soluble dye matter and the excess of Sulphuric Acid is then
poured into a cold concentrated solution of common salt the proportions being say
five parts of the salt solution to one part of the mixture which precipitates the dye
matter the precipitate being then filtered and dried. The dye matter insoluble in a
concentrated salt solution is readily soluble both in hot and cold water.
Having now particularly described and ascertained the nature of this said
Invention and in what manner the same is to be performed 1 declare that what
I claim is-
1. The dye matter soluble in hot or cold water and manufactured from the Santalino
or dye extract insoluble in water of red Sanderswood Caliaturwood Camwood or
Barwood or other analogous dyewoods substantially as herein described.
2. The manufacture of a soluble dye matter from the Santaline or dye extract
insoluble in water of red Sanderswood Caliaturwood Camwood or Barwood and certain
other dyewoods by treating the said extract when dry with Vitriol, Monhydrate or
Sulphuric Acid containing free Anhydrous Sulphuric Acid (SO₂) substantially in the
manner and for the purposes herein described.
Dated this 19th day of September 1887.
H. B. BARLOW,
17, St. Ann's Square, Manchester,
Agent for Applicant.