US 1568886 A
Description (OCR text may contain errors)
Jan. 5 ,1926. 1,568,886
' A. MOD. DUCKHAM ET AL METHOD 0: HEATING MATERIAL AT SUCQESSIVELY DIFFERENT TEMPERATURES v v 1 3w Q m .mww wfi, 1 a 4 Mg g MT mfim H. P .-mw U mHH- M a .N g
1 l I I I l l I r l I I I I l IL Jan. 5', 1928; 1,568,886
A. M D. DUCKHAM ET AL METHOD OF HEATING MATERIAL AT SUdCESSIVELY DIFFERENT TEMPERATURES Filed August 9, 1921 I 2 Sheets-Sheet 2 atented 5, 1923.
ARTHUR HoDOUGALL ncem.
AND J srsniinr measure, or Lennon, sne- LAND, ALMIGHO RS '1'0 THERMAL INDUSTRIAL ND CHEMICAL (T. I. C.) RESEARCH cousin LEKITED, OF LONDON, ENGLAND,;A BRIQISH COMIANY.
mason onm'rrne mdrsnrsn at? succnssruntr ninrnnnur rnntennnrunns.
To all? whom. it may concem:
Be it hnownthat we, McDouesm. Doorman: and Jenn STANLEY MORGAN, both subjects of the King of Great Britain, ti residing in London, England, have jointly invented a certain new and useful Improved Method of Heating Material at Successively Different Temperatures, of which the following is a specification.
A known process of subjecting a mute rial to heat treatment by contact w th a molten metal ($...5l8i38 in causin 1 rial to travel between a surface of the molten metal and a solid surface wholly or 15 partly submerged in the molten metal. Sometimes the solid surface travels with the material, as when the material is caused.
to enter the re-entrant angle between the surface of the metal and the surface of a M drum revolving partly submerged 1n the I molten metal. Sometimes the wlid surface is stationary and inclined, so that the material, introduced beneath the lower end of the surface, travels upwards along the surface owing to the fact that the material s specifically lighter than the molten metal. By the present invention heat treatment of the material is conducted in successive steps by causin the material to travel repeatedly throng molten metal as above described and to acquire a difl'erent temperature ateach passage.
When a. single bath of molten metal is used and the successive temperature steps are attained by varying the time durln which the travel .occurs, the time of trave in each stage wherein the temperature to be attained is lower than the tem erature of the molten metal, must beinsu cient to permit the material to attain the temperature of the molten metal, and must be adjusted so that it is onl sufficient to perimit the material to attain the desired'temperature. l
The invention is illustrated in the accompanying drawings.
Fig. 1 .is a longitudinah sect1on through a number of stills arranged for the fractional distillation of tar oil. The form of still has been described in the application for United States Letters Patent of John S. Morgan, Serial No. 490,650.
Fig. 2 is a plan and Fig. 3 a cross-section of Fig. 1.
are set in the flue of a furnace b.
the mate- Application flied new a, 1am. Serial in. 493,021.
Fig. 4 is a view similar to Fig. 1 ofa modification, and in plan it resembles Fig. 2. i
Referring to Figs. 1 to 3, the stills a This flue is divided into an upper and lower fine by a partition 0 and there isa lay-pass flue (2 putting the upper and'lower flue into communication with each other at oneend of each still. 'The upper flue alone conimunicutes with the furnace so that the proportion of heating gases passing along the lower flue is determined by the degree to which the valves c in the upper flue in front of each flue a? are open. It will be seen that by suitable adjustment of these valves and of the corresponding valves f in the lower flue, the temperature of the several stills may be varied.
The oil is fed by pipe 9 into the still furthest from the furnace (and therefore at the lowest temperature) and is carried beneath the surface of the molten lead It by the revolving drum 5. It leaves the still by pipe is to flow to the next still, and so on throughout the series, the residue being discharged by pipe Z. The volatile conall, serving the function of a bottom to each still. In other respects the stills are constructed as already described and the tar oil flows through them in the manner al ready described. Each of the cylinders 1', however, is rotated at a different speed, the speed decreasing from one end of the series om the necks m in well-lmown to the other and being most rapid in the end still into which the oil is fed and from which the constituents of lowest boiling, point are collected.
Since all the stills are at the same temperature thelead bath is set directly in the flue n of the burner The rate of rotation of each drum or cylinder is such that, in each stage, the
time during which the material passes be tween the surface of the drumand the molten metal is only sufficient to permit the material to attain the temperature desired l'orthat stage.
The invention is particularly suitable for fractional distillation whether of liquid or solid material. As an example of the latter the destructive distillation of Wood may he mentioned, there being considerable adantage in heating the wood in successive stages for obtaining the best yield of the several products.
Having thus described the nature of the said invention and the best means we know of carrying the same into practical efi'ect, we claim:
l. A process of heating a material at successively different temperatures for the purpose of fraetionally vaporizing constituents thereof, which consists in causing the material to travel between a solid surface immersed in a bath of molten metal and a surface of the molten metal, removing the constituents volatilized by the treatment,
and causing the unvolatilized portions of the material to travel between another such solid surface and a surface of molten metal and to acquire a different temperature at each passage.
A process of heating a material at successively difierent temperatures for the purpose of fractionally vaporizing constituents thereof, which consists in causing the material to travel in a bath of molten metal having a given temperature, between a solid surface immersed in said bath and a surface of the molten metal, removing the constituents "olatilized in the bath, and causing the unrolat-ilized portion of the ma terial to pass into another bath of molten metal having another given temperature and there to travel between another solid surface immersed therein and a surface of the molten metal.
In testimony whereof we have signed our names to this specification.
ARTHUR McDOUGALL DUCKHAM. JOHN STANLEY MORGAN.