Improvements in and relating to Evaporating, Boiling, and Drying Appliances.
Year: 1899

page_text: Date of Application, 10th Nov., 1899-Accepted, 30th Dec., 1899
Improvements in and relating to Evaporating, Boiling, and Drying
Appliances.
I, WILLIAM MURRAY MILLER, F.C.S., of Caledonia Estate, Province Wellesley,
Penang, Straits Settlement, Factory Managor and Chemist, do hereby declare
the nature of my invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following state-
ment in writing :-
-
This invention has reference to and comprises improvements in and relating
to evaporating, boiling and drying appliances, such as may be used for evapora-
ting or boiling saccharine or other liquors, or for drying materials such as
tapioca, starch or like granular or pulverulent substances and consists essen-
tially in the use of heated oil for conveying the desired heat to the liquors or
materials to be evaporated or dried, by which the process is carried out at a
regulated temperature without danger of burning or deterioration by excess or
irregularity of heat and with a saving of time, labour and expense.
The evaporating or drying processes are carried on by the use of oils prefer-
ably having high boiling points and the regulation of the temperature is effected
by the selection for the special purpose of an oil the boiling point of which
is not higher than the temperature desired to be applied to the liquors or
materials operated on, which in the case of evaporating saccharine liquor may
be a mineral oil boiling at a temperature of 500° Fahrenheit.
The heated oil may be employed either within a jacketed space beneath or
around the pan, boiler or other vessel containing the liquors or materials or
by introducing and circulating it within the vessel by means of a coil or coils
of pipes or the like.
When a jacketed space is used in connection with the evaporating or drying
vessel, said vessel, which may be either of an open or close nature, is fitted with
an outer casing forming a jacketed space separating the vessel from the fire
or heating medium and this jacketed space is filled with oil having its boiling
point at a suitable temperature and which may be mineral or any other suit-
able oil. The oil is preferably supplied from an overhead tank or cistern
through a pipe leading to the jacketed space while a pipe is carried from the
upper part of said space to the tank where the end may be made to dip into
the oil. This pipe provides against the expansion of the oil and carries off any
vapour generated.
When a coil of piping is used in connection with the evaporating or drying
vessel, it may be of any suitable form and the oil, heated either in a close
or an open boiler, is forced through the coil by means of any ordinary pumping
or circulating appliance and returned to the heating boiler, otherwise a cir-
culating appliance, such as used for healing by water, consisting of an overhead
supply cistern connected to a close heating vessel or coil connected by an outflow
and inflow with the heating coil of evaporating or drying vessel is employed.

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:-
First. The use of heated oil for the purpose of supplying heat at a regulated
temperature to vessels for evaporating liquors or drying materials, substantially
as and in the manner herein described.
Second. For the evaporation of liquors or the drying of materials the use of
oil within a jacketed space formed beneath or around the evaporating or drying
vessel and interposed between said vessel and the fire or heating medium so
as to convey heat at a regulated temperature substantially as and in the manner
heroin described.
Third. For the evaporation of liquors or the drying of materials the use of
heated oil supplied at a regulated temperature to a circulating coil or equivalent
within the evaporating or drying vessel substantially as and in the manner
herein described.
Fourth. The use of heated oils in jackets, pipes, coils, or the like in connec-
tion with evaporating or drying vessels as a medium for regulating the
temperature of and the heating of vessels, or solutions or materials in vessels,
used for evaporating, boiling, or drying, substantially as and in the manner
.herein described.
Dated the 9th November 1899.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agenis.