US1327271A - Process of extracting oils from coal-tar - Google Patents

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H. H. COMBER AND J. W. STALKER. PROCESS OF EXTRACTING (ms FROM COAL TAR. APPLICATION BLED JUNE 17, I918.

3 327 2'71 a Patented Jan. 6, 1920.

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HUBERT HENRY COMBER AND JAMES WRIGHT STALKER, 0F WINNIPEG, MANITOBA,

' CANADA.

PROCESS OF EXTRACTING OILS FROM COAL-TAR.

Patented Jan. 6, 1920.

Application filed June 17,1918. Serial No. 240,381

To all whom it may concern:

Be it known that we, HUBERT HENRY Corinna and JAMES WRIGHT STALKER, both of the city of lVinnipeg in-the Province of Manitoba,,Canada, have invented certain new and useful Improvements in Processes of Extracting Oils from Coal-Tar, of which the following is a specification.

The invention relates to a process of ex tracting oils from coal tar by means of wood alcohol and has for. its principal object the provision of a quick, expeditious and cheap process for separating the oils by using wood alcohol and as a further object the reclaiming of the wood alcohol used in the process so that it can be used again to repeat the process, that is to say, reclaimed and regintroduced.

In order-that the process may be clearly understood 1 have shown diagrammatically the apparatus for carrying out the process and in the drawing accompanying this specification.

The figure represents diagrammatically the aparatus used and the manner in which the Various elements are connected.

In extracting the oils from coal tar the present practice has been to heat'the coal tar and obtain the various oils by distillation, the light oils being given off at a temperature below 350 degrees F., the heavy oils between the temperatures of 350 degrees F., and 4-15 degrees F-., the creosote oil between the temperatures of 4-15 degrees Fand 520 degrees F. and anthracene at a temperature of 520 degrees F. and over, the

final product being pitch.

This is a-rather laborious and painstaking operation owing to the high temperatures required and to the fact that the various oils come off at varying temperatures.

According to our invention, the oils are separated by a cold process by the use of wood alcohol which is put into the coal tar and mixed Well with it. The wood alcohol acts to cut the oils from the coal tar and after a time the wood alcohol and oils are drawn ofi as a solution.

The solution so'obtained is next poured into a receptacle containing water and mixed and the result .of this operation is that the wood alcohol and water combine and appear at the top of the Vessel, while the oils which are heavier sink to the bottom. The oils are at this time free from any foreign substance and are drawn off from the vessel leaving the water and wood alcohol. .his completes the extraction of the oils from the coal tar and in order that the'wood alcohol can be used to continue carrying on the process we distil the water and wood alcohol by heating. I

The wood alcohol is driven ofi first as a vapor, the temperature being properly regulated, and after being condensed can be utilized for introduction into a further quan-- tity of coal tar.

In referring to the drawing, 1 represents a vessel in which the coal tar can be placed. This vessel is connected by a suitable pipe 2 to a mixing tank 3 provided with a drawofi ta Al and fitted with an agitator or mixer 5 which, in the present instance, is shown as provided with a driving pulley 6. A

valve 7 is introduced in the pipe 2. 8 represents a distilling vessel provided with a fire pot 9 and connected with the mixing tank 3 .by means of the pipe 10.

11 represents a return pipe passing from the top of'the distilling vessel to the top of An entry pipe 14 opens to the top of the mixing tank and is provided with a suit-' able valve 15.

In carrying out is placed in the vessel water is poured into the vessel 8, The valve 7 is then opened and a quantity of coal tar is allowed to drain down into the mixing tank. The wood alcohol is then introduced into the tank through the pipe 14 and the agitator is then operated to thoroughl mix the coal tar and the Wood alcohol. hen the mixing has been accomplishedthe wood alcohol and oils combined are drained oil the tank through the pipe 10 into the distilling vessel where they are dropped into the water. In this vessel the water and the wood alcohol separate from the oils and float on top of the oils thereby allowing the oils to'be drawn off through the cook 13.

'A low fire is kept burning in the fire pot which will maintain a temperature of approximately degrees C. in the distilling vessel and this acts to distil the wood alcohol from the water, the wood alcohol passing out of the pipe 11 in the form of vapor 1 and a quantity of .so the mixing tank and provided throughout and being condensed in the coil 12 after which it is re-introduced into the tank and can be utilized to mix With a further quantity of coal tar drawn from the vessel 1.

While We have shown the equipment for carrying on this process, still it Will be understood that it is more diagrammatic than actual and is only herein shown to make clear how the process is carried on. In carrying out the process in the above manner it is necessary to draw off from time to time the pitch like substance accumulating in the bottom of the mixing tank. This is done through the outlet 4:.

What We claim as our invention is The process of treating coal tar toseparate the oils therefrom which consists in thoroughly mixing by agitation in a vessel a quantity of Wood alcohol with a quantity of coal tar in the cold state, then draining 01f the upper layer of liquid comprising the oils and Wood alcohol compound, then introducing the liquid drained off from the former vessel into a. further vessel containing Water to efi'ect the separation of the oils through the compounding of the Water with the wood alcohol andfinally draining oil the oils from the bottom of the latter vessel.

Signed at Vvinnipeg, this 11th day of May, 1918.

HUBERT HENRY COMBER. JAMES WRIGHT STALKER.

In the presence of G. S. RoxBUnGH, K. B. l/VAKEFIELD.

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