New Method of Extracting Naphthalene from Coal Gas.
Year: 1899

page_text: Date of Application, 2nd Feb., 1899
Complete Specification Left, 2nd Nov., 1899-Accepted, 16th Dec., 1899
PROVISIONAL
SPECIFICATION.
New Method of Extracting Naphthalene from Coal Gas.
WILFRED IRWIN, 3, Wilton Polygon, Cheetham Hill, Manchester, Chemist, &
JOHN PETTY LEATHER, 17, Carlton Road, Burnley, Gas Engineer, do hereby declare
the nature of this invention to be as follows:-
:--
This invention is designed to remove naphthalene from ordinary coal gas before
it leaves the gas works. In carrying it out we proceed as follows. After the gas
has been cooled and freed from tar, it is brought into intimate contact with a liquid
such as oil, naphtha, phenol or spirit or mixture of the aforesaid having the
following properties.
It must be practically free from naphthalene.
It must be capable of dissolving naphthalene.
It must give off at the ordinary temperature a vapour whose tension and effect
on the illuminating power of the gas is such that the loss of illuminating power
occasioned by the extraction of naphthalene and other substances is more than
compensated by the gain from substances taken up by the gas from
the liquid itself. Such convenient liquids are, mixtures of blast fur-
nace tar oil and low boiling aromatic hydrocarbons or heavy tar oil
and low boiling aromatic hydrocarbons. The liquid after saturation with
naphthalene may be subjected to distillation with steam and the lower boiling
hydrocarbons thereby extracted for use in a subsequent operation. The plant
required for our process is similar to that employed for extracting ammonia from
gas but we specially recommend a washer in which the liquid can travel in a
direction opposite to that of the gas through a series of chambers in each of which
it is brought into intimate contact with the gas.
Dalal thi. 0741 1. T 1000
New Method of Extracting Naphthalene from Coal Gas.
We, WILFRED IRWIN, of 3, Wilton Polygon Cheetham Hill, Manchester, in
the County of Lancaster, Chemist, and Joux PETTY LEATHER, of Carlton Road,
Burnley, in the County of Lancaster, aforesaid, Gas 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 following statement:
This invention relates to intprovements in the purification of ordinary coal gas

page_text: lene and also of giving up to the gas substances to enrich it and compensate for
the loss of the naphthalene or other illuminating substances substantially as
described.
2. The process of extracting naphthalene from coal gas by washing same with
very small quantities of blast furnace oil heavy tar oil or other solvent or naphtha-
lene mixed with benzol substantially as and for the purpose described.
3. The process of extracting naphthalene from coal gas by washing same with
a liquid having the properties set forth employed in small quantities varying
with the temperature to which the gas has been cooled and in apparatus in which
the gas is brought into intimate contact with the particles of the liquid substan-
tially as described.
Hated this 31st day of October 1899
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.