US2266949A - Coke-oven apparatus - Google Patents

Description

J0$Pfl86k& BY v I f I f ATTORNEY;

II II J BECKER COKEOVEN APPARATUS Filed Aug. 22, 1939 Dec. 23, 1941.

Patented Dec. 23, 1941 pers Company, Pittsburgh, Pa.,

Delaware a corporation of Application August 22, 1939, Serial No. 291,333

8 Claims.

The present invention relates in general to horizontally-elongated coke ovens and more especially to those collecting mains therefor that extend lengthwise of a battery of such ovens along its upper part and into which the products of distillation efliuent to the coking chambers are flowed after their passage through the ascension pipes.

An object of the present invention is to adapt the collecting mains of horizontal coke ovens to the recovery, from the mixed vapors and gases of carbonization flowed therethrough, of condensates having diverse characteristics.

Another object of invention is to provide for coke ovens of the stated class an improved collecting main that makes feasible the segregation and separate recovery of condensates removed from the volatilized products of the carbonizetion process by their cooling in difierent portions of the collecting main.

Another object of invention is the provision of simple and effective means whereby the gases and vapors that issue from the coking chamber of a battery of horizontal coke ovens can be subjected in the collecting main to gradational cooling steps and the thereby produced condensates be substantially separately recoverable.

Another object of invention is to provide for a coke-oven battery a compartmented collecting main whose compartments are communicably connected for purposes of gas-flow but are substantially isolated in respect of liquids accumulated therein. q

Another object of invention is the provision, for a compartmented collecting main of cokeoven batteries, of regulable gas-flow passageways between the compartments, so as to-facilitate uniformity of gas-flow through all parts of such a collecting main.

Another object of improvement is to furnish, for a coke-oven battery having a collecting main that is compartmented according to the present improvement and is adapted to flow volatilized products of the carbonization process in sequence through a plurality of such compartments, means whereby that compartment which communicates directly with the ascension-pipe cut-oif valve can be optionally by-passed by volatiles issuing from individual coke ovens, so as to facilitate their smokeless charging whenever a pressure gradient is maintained across communicably-connected compartments of the improved collecting main, as will be hereinafter set forth. v e

The invention has for further objects such other improvements and such other operative advantages or results as may be found to obtain in the processes or apparatus hereinafter described or claimed.

During the carbonization period in horizontal coke ovens, the hot mixture of fluids distilled out of the coking chambers is generally flowed through ascension pipes that are individual to each coke oven and thence directly into a collecting main that is common to a large number if not to all of the ovens comprising a battery. The ascension pipes are each provided with a cut-off valve whereby the flow-path between individual coking chambers and the collecting main can be optionally and periodically interrupted, so that there can be no passage of gases and vapors therebetween during the periods of pushing and charging an oven. In the collecting main. the mixture of hot fluids flowed thereinto is cooled to a desired outlet temperature usually by direct contact with a spray of cooled, recirculated condensate that has been previously removed from carbonization gases during the steps of their cleaning. The aqueous portions of such condensates are commonly employed for the said cooling purposes although the separated tarry fractions have also been employed. The above-mentioned cut-off valves are generally of the hydraulic type and are so disposed as optionally to permit a temporary segregation of a portion of the cooling spray in the form of a pool or basin having appropriate depth and position to interrupt the flow of volatilized distillation-products through the ascension pipes. According to some designs, the cut-off pool is arranged to be collected at some point intermediate the extremities of the ascension pipe and in other schemes it is disposed for accumulation within the collecting main at a point where it effects immersion of the outlet end of said ascension pipe.

.Heretofore, it has been the general practice to commingle within the collecting main substantially all liquids condensed both therein and in the ascension pipes by cooling of the fluids of carbonization traversing them. In consequence, therefore, the tarry and the aqueous liquids drained therefrom, according to prior practice, have represented a composite of all such condensed constituents, the aqueous condensate being a watery solution of the therein soluble constituents whereas the tarry portion was the product of intermingled hydrocarbons of great diversity of physical characteristics.

7 In result, when itwas desired to prepare from having more specific properties or to isolate therefrom a definite chemical entity, it has been necessary subsequently to treat larger quantities of such tars than would have been the case ifso disposed that the condensates formed in each compartment; from the volatilized products of the carbonization process, tend to settle and are maintained separate from those formed in another compartment; and the said partitionwalls are further arranged so as to permit relatively unimpeded flow of the distillation gases .and vapors from one compartment to that adjacent. The compartments are each furnished individual discharge-outlets that are located preferably-at an end of the collecting main, but can be disposed at several points along the length thereof, for drawing the collected condensates therefrom to appropriate storage. The instant invention also provides the said collecting-main such collecting-main tars a-nuantity of products compartments of the improved collecting main are maintained at different gas pressures.

The same characters of reference designate Elie same parts in each of the views of the draw- Referring now to the drawing: Coal charged into the coking chamber In of a battery of horizontally-elongated coke ovens through charginghole II and retainedin said coking chamber by door l2 supported at the end thereof, is subjected to carbonization heat by the combustion of fuel gas in the heating fiues of the heating walls thereadjacent; said heating flues being vertically-disposed in the well-known manner in the heating walls which are themselves disposed in alternation with coking chambers lengthwise of the battery. At their lower ends, the heating fines each-communicate by means of a duct IS .with at least one cross-regenerator I that serves to regeneratively preheat combustion media flowed into the lower parts of the heating lines.

The gases and vapors, volatilized from the coalcharge by carbonization-heat transmitted thereinto from the heating walls, flow upwardly from the coal-charge into the gas-collecting space I5 whence they pass, under the influence of suction applied to the collecting-main by exhauster 45,

compartments each with'individually-controllable spray-means for reducing the temperature of the gases and vapors flowed therethrough to a preferred degree by means of cooling liquids employed in optional quantities and at optional temperatures to effect a specific cooling-result in any compartment. In thosecompartments adjacent the ascension pipes, the said spray-means are disposed in such position that spray collected therefrom renders operative the hydraulicv cut-- off valves for the ascension pipes. I

In the accompanyingdrawing forming a part of this specification and showing for purposes of .exemplification a preferred apparatus and method in which the invention may be embodied and practised but without limiting the claimed invention specifically to such illustrative instance, or instances: q

Fig. 1 is a partial elevational section taken through a coking chamber and crosswise of a battery or horizontal coke ovens embodying the improvement of the instant invention, the said section being taken along the line II of Fig. 2 and showing an ascension pipe and a portion of the crosswise regenerators beneath a coking chamber; A

Fig. 2 is a partial plan view of the collectingmain side of the battery of Fig. 1 and showing; the ascension pipes of several ovens, the collecting-main off-take, and means for individually draining different condensates from the illustrated collecting main;

Fig. 3 is a fragment of Fig. 1 showing a useful modification of the invention illustrated therein;

Fig. 4 is a section taken along the line IV-IV of Fig. 3; and

Fig. 5 shows an embodiment of the present inthrough short duct l6 into the vertical leg ll of the illustrated ascension pipe 'I 8, the said vertical leg thereof being preferably protected against heat-loss by means of a sheathing IQ of insulating material.

Ascension pipe l8 comprises essentially the said vertical leg l1 and the recurved section which, at a point above the vertical leg, has a port 2| provided with a closure-cap 22 that is hinged, as shown in. the drawing, to the exterior surface of the recurved section -20. Port 2| provides access to the interior of the said ascension-pipe sections so that deposits accumulated therein can be removed at the end of a carbonization period; it also serves to vent to the atmosphere gases and vapors evolved from the coal charge at such times as communication between the collecting main and a coking chamber is interrupted.

Along that portion thereof adjacent the battery-face, recurved section 20 of the ascension pipe is adapted to pass through the exterior wall of collecting main 23 and to curve downwardly therein substantially as shown in Fig. 1. The collecting main itself is supported along the top of the battery by its buckstays 24.

Pivotally mounted on the inner walls of the collecting main and directly beneath the outlet end of recurved section 20, there is the hydraulic cut-oil" valve for the ascension pipe which comprises basin-like member 25 that is operative for movement between the positions indicated by the solid and dotted lines. Pivot 26, that supports said member 25 within the collecting main, is aflixed to weighted lever 21 whereby it is retained in its different operating positions and is movable therebetween, and the said member 25 is adapted for elevation to such position as brings its upper rim above the lower end of the ascension-pipe outlet a distance adequate to entrap therein cooling liquid, sprayed from nozzle 29, in

depth suflicient to prevent passage of gases and vapors between the collecting main and the ascension pipe, thereby sealing oil the carbonization chamber. The inner diameter of the valvemember is greater than the external diameter of the ascension-pipe outlet, so that sprayed cooling-liquid in excess of that required for sealing purposes can easily overflow into the collecting tends a main. ,That portion of the ascension pipebel tween flange 30 and its outlet end, as well as that portion of the collecting-main walls 3|, 3|, are preferably formed as a single unit both for simplicity of fabrication and to facilitatedisassembling when necessary. emovable plate 32 provides convenient access to the interior of the collecting main and to the valve-member from the outside thereof, without disturbing other members of the assembly, by removal of its supporting bolts 33. j

According to the improvement of the present invention, collecting main 23 plurality of individual, but at all times communicably-connected, arcuate compartments by means of division-walls that extend longitudinally thereof and are so disposed therealong that condensates, formed by the cooling of distillation gases and vapors as they are flowed througif an individual compartment, are substantially com pletely retained, settled, and collected therein; means arealso provided whereby the condensates formed in any single compartment can be individually withdrawn therefrom to preferred storage.

In the arrangement of the said collecting-main division-walls of invention shown in Fig. 1, division-wall}! is disposed along the vertical diameter of the collecting-main and extends upwardly from the bottom of the main a distance slightly less than its radius whereas division-wall 35. is disposed along a collecting-main diameter .inclinedto division-wall 34 and along which it exdistance somewhat greater than the main's radius, thereby separating said main into two compartments the smaller 33 of which contains both theoutletend of the ascension pipe and the hydraulic cutoff valve. The horizontally-elongated passageway 38 formed by the described disposition of division- walls 34, 35, functions as to provide permanent communication between the two said compartments substantially the full length of the collecting main.

Division-wall 35 on its lower surface has aflixed thereto a strip of angle-iron 39 that is operative to direct the dripping of cooling-spray'and condensate, accumulated in the lower side of division-wall 35, into the bottom of compartment33 and thus promotes completeness in the isolation of the condensates formed in the individual compartments. w

Compartments 33, 31, are provided each with an individually valved discharge-pipe, respectively 40, 4|, located at the lower end collecting main.

Branching off from collecting main 23 and directly from the compartment 31 side thereof is of the inclined the collectlng-main'ofi-take pipe 42 that is communicably connected with exhauster-means arranged to draw volatilized distillation-products in series through the ascension pipes, the collecting-main compartments and into other wellknown gas-cleaning equipment such as the primary coolers,reheaters, saturators, etc. At the junction between the collecting main and off take pipe 42, there is provided terrace-like plates 43 that serve as a barrier to prevent condensates accumulated-in the bottom of compartment 31 from entering said off-take pipe and being later commingled with condensates collected at a further point in the gas-cleaning system; for example, with the primary-cooler tar. The barrier-plate 43 should preferably retain suiiicient head of condensate, in the bottom of compart- 36, 31, of unequal capacity.

'is divided into a' invention which such materials into valved pipe H.

Nozzle 44 provides means for spraying a cooling fluid into the collecting-main compartment 31; and nozzle 4 materials volatilized from the coal, during its charging into the ovens, can be jetted into the collecting main and the escape of the atmosphere be thus pre' vented.

As above described, the division-walls of the invention are given rather specific disposition in the collecting main and are only shown as dividing it into two communicating compartments, but itwillbe understood that such division-walls and the resultant compartments formed thereby can be-increased in number and be variously arranged without departing from the spirit of the is to provide a siniple expediency whereby condensates of diverse composition can be recovered from the collecting main of horizontal coke ovens.

At such time as a coking. chamber III is in the carbonization period of its cycle of operation, closure-cap 22 and valve means 25 are in the positions illustrated by their solid lines of Fig. 1, thereby providing a free flow-path for the hot volatilized distillation products, under the influence of suction existing wards through the vertical leg of the ascension pipe and along the horizontal section thereof and thence into collecting-main compartment 36 after having first been flowed through a spray of cooling-liquid introduced into the down-- bonizatlon-products and thus effects condensalated in the lower part tion of higher boiling constituents therein, the

said, spray also operating to scrub the thereby condensed materials from the uncondensed gases and vapors and to deposit them in the bottom of compartment 36 whenc they can be separately withdrawn through valved pipe 43. Flowing from the first cooling step in compartment 36, the remaining gases and vapors enter compartment 31 through slit-like passageway 38 and are there subjected to a further cooling step by another spray introduced thereinto from nozzle 43 thereby condensing, from vapors, a further quantity of their condensables which are deposited at the bottom of compartment 31, the remaining uncondensed materials entering off-take 42 whereby they are'flowed to further treating teps. The condensates accumuof compartment 31 are separately withdrawable through valved pipe 4|.

it should be noted that division-wall 35 is so disposed in respect of nozzle 44 that its spray and the thereby formed condensates removed from the distillation products cannot have access or be carried into compartment 36 to alter the physical properties of the constituents removed in the latter.

From the above given, it now becomes ap-' subjected to stepwise cooling efiects as they tend to be drawn crosswise of the collecting main from the ascension-pipe outlets to the collectingmain off-take and that in consequence the condensates removed in compartment 36 will tend to have segregated therein pitchy and higher boiling materials in greater proportion than-will communicates with a source of steam whereby inside oil-take 42, up-

the remaining gases and cut-off be found in the condensates collected in compartment 31 wherein the recovered mixture will have a tendency toward a lower viscosity and boiling range than that of the adjacent compartment, and it is also manifest that, for a given over-all cooling in the collecting main, a therein condensed constituent will tend to be held in greater proportion in the one or the other of the two condensates than would obtain if all the condensed materials were, as formerly, commingled in the collecting main. The present improvement thus provides a simple expediency whereby collecting-main tars of horizontal coke ovens, at practically no added expense, can be now separated into portions having rather specific properties that show segregative effects of their constituents that could formerly only be produced by a distillation step outside of the collecting main in special distilling apparatus.

The improvement ofthe invention lends itself to the production of aqueous or tarry fractions of great diversity in their characteristics by altering the degree of cooling efiected in the dinerent collecting-main compartments through variations of the temperature maintained therein and the rate and the kind and temperature of the liquid sprayed thereinto. For example, cooled aqueous condensates can be sprayed into compartments 35, 31, at equal rates and temperatures; or recirculated hot aqueous condensate can be sprayed at divers rates and at thermostatically-controlled temperatures up to its boiling point into compartment 36, at the same time that' cooledaqueous condensate is sprayed at divers rates into compartment 31; or, if it is required that, in order to produce a desired type of condensate, the gases and vapors must issue from compartment 36 at a temperature higher than will result when hot aqueous condensate is sprayed thereinto at a rate making the hydraulic means satisfactorily operative, their temperature of issuance can be optionally raised by spraying hot tar or any specific fractions thereof either alone or simultaneously with a spray of previously recovered hot aqueous condensate into said compartment 36, while at the same time either hot or cold gas liquor is introduced into the adjacent compartment. The conresults eflectible by the present invention: are thus of great diversity and are limited only by the skill of the operator and his ability to modify results by the above-provided means.

The characteristics of the tarry condensates recoverable from the improved collecting main of invention can be further modified accordingly as the gases and vapors discharged from the ascension pipes into compartment are provided with an oblique flow-path, as they pass through passageway 38 into .compartment 31, or are induced to pass by the shortest path from the former to the latter compartment. In Fig. 2, the therein illustrated fragment of collecting main is shownprovided with but one ofi-take 42 leading to the exhauster means. In consequence, the gases and vapors discharged into the collecting main from the coke ovens directly adjacent the said oil-take will tend to pass more quickly from one step of condensation to the next than those gases and vapors entering the collecting 'main near its end. According to the invention therefore. in those instances, where the characteristics of the to-be-produced condensates requires rapid transfer of the carbonization prodnot: from theconditions obtaining in one compartment to those in oil-takes 42 is provided.

Not only is the apparatus of invention of utility for separating tars of diflerent characteristics from the volatilized products of a coalcarbonization process but it is also of advantage .municably connected, for purposes of through stufiing-box or decrease the area of its associated passageway.

for segregating into a smaller volume of aqueous condensate a therein contained preferred salt such,'for example, as ammonium chloride.

The individual collecting-main tar fractions producible by the instant improvement are amongst their other uses of specialvalue for purpose of blending either with each other or with bituminous materials from other sources to produce products for special uses and specifications.

As hereinbeiore described, the improved collecting-main apparatus illustrated in Figs. 1 and 2,is shown with its compartments 36, 31, comgas-flow, by means of a slit-like opening 38 that extends longitudinally of the collecting main substantially its entire length. Such continuous passageway is especially suitable for use in combination with a coke-oven battery that is continuously operated at substantially one coking time. For-those batteries, however, that must be adaptable to wide fluctuations in the duration of the carbonization period, a practice which gives rise, from time to time, to correspondingly wide variations of the rate at which gases and vapors are flowed into their collecting mains, it is desirable to have a collecting main of the instant improved type that is operative to distribute said gases and vapors through all parts of its compartments uniformly, and whether or not their rates of introductionare slow or rapid. This desirable uniformity of distribution is rather difiicult to obtain at reduced coking rates by means of the apparatus as illustrated in Figs. 1 and 2, and more especially so if the collecting main is provided with only one oil-take 42. To cope with this circumstance, the improved apparatus of those figures, is modified as shown in Figs. 3 and 4 wherein the compartments 35, 31, of main 23 are interconnected by means of a plurality of smaller passageways 41 whose effective cross-sections are individually regulable by a device comprising'a plate 48 that can be raised or lowered, by the thereto affixed handle 49 extending upwards to the outside of the main 50, respectively to increase Thus, at slow coking rates, the effective areas of passageways 41 can be optionally graduated, from a point adjacent a collecting-main oiI-take to the ends of the collecting main, to provide the same rate of gas-flow through each. Guidestrips '5! serve to determine the path described by the valve-plates 48 when they are moved.

In some instances, in order to effect certain operating results inthe battery, it is desirable to carry, for example, a plus 6 mm. or more pressure in the collecting main and a minus 30 mm the other, a plurality of when operatcompartment that is maintained aboveatmospheric pressure. The embodiment of the instant invention shown in Fig. is designed to over-' come the disadvantages of such an obstacle. In said figure, compartments 52, 53, are, communicably connected by passageway 54 that is provided with valve-means for regulating the flow of gases and vapors from the former to the latter compartment, said valve-means comprising plate 55 that is attached to rod 55 whereby it can be raised or lowered, from outside the main,

respectively to increase or impede the flow of gases and vapors through said passageway, thereby respectively decreasing or increasing the diflerence in static pressure between the said compartments. I i

Let it now be assumed that valve-plate 55 is in such position, in respect or the outlet of passageway 54, that the fluids flowing through compartment 52 are maintained under a static pres. sure of plus 6 mm. and that those flowing through compartment 53 and into itsofl-take 59, are at a minus 30 mm. pressure, and let it be further assumed that the ascension pipe 51 is associated with a coking chamber that is being'charged and is consequently sealed-off from compartment 52 by its closed hydraulic valve 58. According to the embodiment of the invention in Fig.5, there is provided direct communication between the interior-of the ascension pipe and that of lowerpressure compartment 53 through opened port 60 which is disposed to be opened or closed according as closure 6| therefor is respectively raised or lowered from outside the main by its attached handle. In the open position 'of port 60, as shown in the figure, smoke, and the like, can be flowed from the associated coking chamher during its charging, directly into the lowerpressure compartment of the collecting'main by the assistance of a -jet of steam, if necessary, introduced into the ascension pipe through nozzle 62, thereby advantageously avoiding the necessity of charging-on-the-main into a collecting-main compartment that is maintained at pressures above atmospheric. L

Upon completion of the charging operation, hydraulic cut-off. 58 is lowered and port 60 is closed by lowering its closure 80 and the constituents volatilized from the coking chamber are again flowed from the ascension pipe in sequence through compartment 52, passageway 54, compartment 53 and into oil-take 59.

The invention as hereinabove set forth is embodied in particular form and manner but may be variously embodied within the scope of the claims hereinafter made.

I claim:

1. Apparatus for separate recovery of condemsates having diverse characteristics from distillation gas as it issues from a battery of coke ovens, comprising: a compartmented gas collecting main whose compartments are separated from each other by partitioning extending longitudioperable spray means for spraying cooling liquid into the gas for separately controlled cooling and condensation in the respective compartments on opposite sides of their longitudinal partitioning;

and means for separately withdrawing the condensates from-the respective compartments; the spray means for the gas for the first compartment being operable to spray into the ascension pipe outlets 'to spray cool the gas for the first compartment and to maintain the hydraulic seal and wash the ascension pipe outlets and the spray means for the second of the compartments being operable to spray into the free space therein to further cool the gas from the first compartment; and the spray means for the respective compartments being individually controllable for controlled stepwise cooling or the gas in the respective compartments while flowing to the collecting main gas ofltake means, for effecting segregation of higher boilingcondensates in the first compartment and lower boiling condensates in the second of the compartments for separate withdrawal from the main by the aforesaid separate withdrawal means therefore. 1

2. Apparatus as claimed in claim 1 and in which the compartments of the main communicate with each other for the gas flow in series by means of slit-like passageway mean extending longitudinally of the main in the, compart-- ment partition between the compartments.

3. Apparatus as claimed in claim 1 and in which valvemeans are provided for regulably modifying the eflective cross-sectional area of the connection for gas flow from the preceding compartment to the next.

'4. Apparatus as claimed in claim 1 and in I which a valved by-pass gas outlet is provided inside the main between the ascension pip projecting outlets and the second of the compartments in advance of the breakable hydraulic seal for bypassing the first compartment with gas flowing from'the outlets to the second of the compartments when the hydraulic seal is not liquids therein segregated from each other;'

ascension pipe outlets for the ovens communicating with one of the compartments on one side of the longitudinal partitioning, and each having 4 a-liquid seal for inlet of the gas to the main; collecting-main gas ofltake-means connected with a second of the compartments on the opposite side of the longitudinal partitioning; separately operable spray means for spraying cooling liquid into the gas for separately controlled cooling and condensation in the respective compartments on opposite sides of their longitudinal partitioning; and means for separately withdrawing the condensates from the respective com-- partments; the spray means for the gas for the first compartment being operable to spray cool the gas for the first compartment and the spray means for the second of the compartments being operable spray into the free space therein to further cool the gas from the first compartment;

and the spray means for the respective compartments being individually controllable for controlled stepwise cooling of the gas in the respective compartments while flowing to the collecting main gas oiftake means, for effecting segregation of higher boiling condensates in the first compartment and lower boiling condensates in the second of the compartments for separate withdrawal from the main by the aforesaid separate withdrawal means therefore.

6. In a coke oven battery comprising, a p1urality of side-by-side coking chambers; ascension pipes adapted to flow gases and vaporsofl from the respective coking chamber; a collecting main common to and communicating with a plurality of said ascension pipes; and valve means for shutting off the ascension pipes i'rom the main; the combination of a plurality of compartments in said main communicating with each other all along the main through, and separated from each other by, Partitioning extending longitudinally of the main; said longitudinal partitioning being so arranged relative to the ascension pipe inlets to the main as to cause gases and vapors from the ascension pipes to flow in series crosswise of the main from one compartment to the next, for fractional segregation in the main of constituents from gas flowing through the main from the ascension pipes, and said longitudinal partitioning being adapted to restrict the passage of liquids. between said compartments; and means for separately drawing on liquids from the separate compartments.

'7. In a coke-oven battery comprising, a plurality of coking chambers a common collecting main; ascensionpipes communicably connecting the oven chamberswith the common collecting main; and valve ineans for closing the ascension pipes to gas flow: the combination of a plurality of compartments in said main arranged side-byside transversely of the main and separated from each other by partitioning extending longitudinally of the main: said ascension pipes being connected with one 01' said compartments for inlet of gas thereto; said compartments being connected with each other for gas flow from one to another across the longitudinal partitioning along the length of the main; said partitioning being so related to the ascension pipe inlets to the main that fractional segregation of constituents of the gas takes place by flow of gas from the inlets first through the inlet compartment before passing through the connection to the next compartment, and said partitioning being so disposed as to restrict the passage of liquids between adjacent compartments and thereby prevent extensive intercompartmental commingling oi condensate formed from vapors and gases flowed between them; and means for separately withdrawing liquids from the separate compartments.

8. The combination with a plurality of coking chambers, a common gas collecting main'therefor, scalable gas ascension pipes connecting the tops of the coking chambers with the main. and gas oflftake means for leading gas from the common gas collecting main; of a gas inlet compartment and a separate gas outlet compartment in said main connected for flow of gas from the inlet compartment into the outlet compartment: said ascension pipes communicating with the gas inlet compartment and said gas ofltake communicating with said gas outlet compartment, so. as to cause gas from the ascension pipes to flow first into the inlet compartment before reaching the connection thereof with the outlet compartment. and flow thence through the connection and the outlet compartment, in order to reach the gas-ofitake means; for fractional segregation of constituents in the separate compartments from gas flowing oil from the coking chambers through the main; said inlet and outlet compartments being. adapted to keep liquids in their compartments separate from each other; and means tor separately drawingv oil liquids Iromthe separate compartments;

' JOSEPH BECKER.

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