Improvements in the Manufacture of Anthracene.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Anthracene.
I, THOMAS WILTON, of The Gas Light and Coke Company's Tar and Liquor
Works, Beckton, in the County of Essex, Chemist, do hereby declare the nature
of this invention to be as follows:-
My invention relates to the manufacture of anthracene and consists in a new
or improved method of purifying or dissolving out the impurities therefrom.
I have found that liquefied ammonia gas (N H3) has the power of dissolving out
most of the impurities in crude anthracene, while at the same time the anthracene
itself is insoluble or practically so. By the use of liquefied ammonia gas therefore
I am able to obtain anthracene of a higher commercial purity at little expense.
In applying the process the anthracene is powdered and placed in a receiver
and the ammonia is passed through it in a liquid form under pressure, after
which the ammonia is evaporated from the impurities dissolved out of the
anthracene and then condensed in a coil. Then the ammonia is ready for use
again and the anthracene is left in a highly purified state in the first receiver.
Dated this 31st day of December 1898.
J. C. CHAPMAN,
Agent.
Improvements in the Manufacture of Anthracene.
I, THOMAS WILTON, of The Gas Light and Coke Company's Tar and Liquor
Works, Beckton, in the County of Essex, Chemist, do hereby declare the nature
of this invention, and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:-
My invention relates to the manufacture of anthracene and consists in a new
or improved method of purifying or dissolving out the impurities therefrom.
I have found that liquefied ammonia gas (NH) has the power of dissolving out
most of the impurities in crude anthracene, while at the same time the anthracene
itself is insoluble or practically so. By the use of liquefied ammonia gas therefore
I am able to obtain anthracene of a higher commercial purity at little expense.
In applying my process the anthracene is powdered and placed in a receiver
and the ammonia is passed through it in a liquid form under pressure, after
which the ammonia is evaporated from the impurities dissolved out of the
anthracene and then condensed in a coil. Then the ammonia is ready for use
again and the anthracene is left in a highly purified state in the first receiver.
I will describe one means of carrying my method into useful effect in reference
DO17

page_text: to the accompanying drawing which shows. diagrammatically in vertical section
an apparatus which I have found to give good results, though I lay no claim
to this particular apparatus and any suitable means may be used. The apparatus
illustrated consists of an airtight receiver a having a bottom strainer 6. The
lower part of this receiver (below the strainer) is connected by a pipe e to a
lower vessel d. In order to render the process continuous I connect the lower
vessel by a pipe e to a coil-condenser / situated within a vessel arranged
at the upper part of the apparatus and connected to the receiver a by the pipe h
fitted with a stopicock.at ./:
In using this apparatus the anthracene to be purified is pulverised and placed
in the receiver a and the whole apparatus is made airtight. I then subject the
anthracene to the action of the solvent NH, by passing same therethrough in
a quid form and under sufficient pressure to maintain liquefaction. During the
process the substance that is dissolved out of the anthracene under treatment by
the selective action of the solvent runs in liquid form, through pipe. to the
lower vessel, d, from which it is subsequently removed; the anthracene which is
not acted upon by the solvent, remains in the vessel and may be removed
therefrom. The ammonia (N H₂) when in the lower vessel d may be evaporated
by heat or otherwise from the substances dissolved out; the vapour of ammonia
will then pass up pipe and being recondensed in the coil f will pass into the
vessel j, and thence by pipe to the receiver a, when. the cock i is opened.
Thus the anthracene is left in an insoluble and highly purified state in the
receiver a and the ammonia solvent may be applied to the anthracene under
treatment over and over again, the required pressure being maintained in the
apparatus during the whole of the process.
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 herein described new or improved method of purifying anthracene
which consists in subjecting same to the action of liquefied ammonia gas (N H₂)
under sufficient-pressure to maintain liquefaction, whereby other substances or
impurities are dissolved out and the anthracene is obtained in a highly purified
state, substantially in the manner set forth.
2. For the purpose of purifying anthracene during its manufacture, the use
of liquefied ammonia gas (N H.) substantially in the manner herein set forth.
Dated this 30th day of September 1899.
J. C. CHAPMAN,
Chartered Patent Agent, 70, Chancery Lane, London, W.C.