Improved Creosote Compound.
Year: 1897

page_text: This Print is in accordance with the Original Specification as it stands after Amend-
ment (under Section 18 of the Patents, &c. Act, 1883) as allowed by the
decision of the Comptroller General of the 19th day of December 1898.
Date of Application, 8th Nov., 1897-Accepted, 11th Dec., 1897
Improved Creosote Compound.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord Street,
Liverpool, and 6, Bank Street, Manchester, both in the County of Lancaster, and
Lower Temple Street, Birmingham, in the County of Warwick, Civil Engineer,
do hereby declare the nature of this invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the follow-
ing statement; -
The invention communicated to me from abroad which forms the subject of the
present application for a patent has for its object a new or improved preparation
of creosote, called by the communicator phosphate of creosote. The preparation of
the said product consists essentially in treating three molecules of alkalised
creosote with one molecule of oxychloride of phosphorus (POC³). The molecula
weight of creosote is regarded as resembling very nearly that of guaiacol.
In carrying the manufacture into practice the inventor prefers to take
Creosote.
Caustic Soda
Water
Oxychloride of phosphorus
37 kilos. 200 grammee.
12 kilos.
135 litres.
15 kilos. 350 grammes.
The caustic soda is first dissolved in the water, then the creosote is added. To
the cold solution obtained in this manner there is added gradually oxychloride of
phosphorus up to neutralisation. An oily product is precipitated which is purified
by repeated washings with water, and with dilute soda solution, and finally dried.
Instead of operating on an aqueous solution the process can be conducted in a
toluene solution in the following manner: -
The creosote is dissolved in toluene (C7 H8), there is then added an equivalent
quantity of metallic sodium, and the mixture is heated to boiling in a return con-
densing apparatus. When the sodium is combined oxychloride of phosphorus
is dropped into the solution up to neutralisation. The toluene is then removed
by means of steam. The oily product which remains is purified by repeated wash-
ings with water and weak soda solution, and is then dried. It is also possible to
obtain phosphate of creosote by acting upon creosote either pure or alkalised by
means of equivalent quantities of perchloride of phosphorus (PCL) or of anhydrous
phosphoric acid (P205). Phosphate of creosote is decomposed by boiling which is
effected above 360 degrees.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1. The process for producing a phosphorus compound of creosote consisting
essentially in treating pure or alkalised creosote in aqueous solution with a phos-
phorus compound in the proportion of three molecules of alkalised creosote to one
molecule of oxychloride of phosphorus or an equivalent proportion of phosphorus
pentachloride or of phosphoric anhydride, substantially as described.
2. In the process set forth in Claim 1 the use of toluene as a solvent in place of
water, substantially as described.
3. The new chemical compound produced by the process above set forth.
Dated this 8th day of November 1897
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents
For the Applicant.