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Nov. 1, 1938. D, A. MONRO Y 2,134,882 FRACI‘IONATING APPARATUS AND METHOD OF FRACTIONATION Filed July 26., 1935 w-IF-M' if Bottom Stock’ 2 I’ I. m, 47 ..~ - ' . 1 BOttom Jtocla "8' > INVENTOR Domlld?. Monro BY N5. ATTORNEY .K Patented Nov. 1, 1938 2,134,882 umrso STATES PATENT OFFICE I 2,134,882 FRACTIONATING APPARATUS AND METHOD OF FRACTIONATION . Donald A. Monro, Chicago, Ill., assignor to Stand; ard Oil Company, Chicago, 11]., a corporation of Indiana Application July 26, 1935, Serial No. 33,358 6 Claims. (Cl. 196-73) This invention relates in general to the pro duction of a multiplicity of grades of hydrocar bon stocks in a novel unitary fractionating or stabilizing apparatus and more especially to im 5 provements in the manufacture of stabilized gas ble plate which has been designated 2'. The division plate 6 extends from one side of the column to the other, thus forming two com pletely separated sections 1 and -8 in the lower portion of the column I, the sections ‘I and 8 oline-like constituents and an apparatus there extending from the bubble plate 2“ to the bottom for. of the column. Hydrocarbon material to be treated, such as gasoline or naphtha'distillate from a cracking unit to be stabilized, may be introduced-as feed .10 stock into a line 9 and conducted to the frac tionating column I through one or more valved branch lines II. The feed stock is introduced - In the manufacture of gasoline it may often become desirable to produce from a fractionator or stabilizer column associated with an oil re?n ing unit, such as a cracking unit, two or more gasolines differing from one another only in the degree of stabilization. For instance, it may be desirable to make one grade of gasoline relatively low in butanes for use in warm climates and an above the bubble plate 2* de?ning‘the top of the separated sections 1 and 8 thus making possible other grade of gasoline considerably higher in bu— the collection of only a bottom stock in each of tanes for use in cold climates. Not only may it be desirable to produce two or more grades of the separated sections. Vaporous constituents separated from the feed stock pass upwardly gasoline, but it may also be desirable to produce through the fractionating column and the ?nal overhead product, which consists of undesired a 20 two or more grades of lubricating oils having different ?ash points or two or more grades of light constituents, is conducted through a line asphalt from crude oil or reduced crude oil in a I! to a condenser 13, from which it is passed to unitary fractionating or stabilizing apparatus. a receiver l4 having a valved gas outlet line I! My inventioncontemplates the manufacture of and a liquid withdrawal line IS.’ The liquid prod I, two or more different grades of hydrocarbon ucts collected in the receiver I4 may be with stocks in an apparatus particularly adapted for drawn through the line I6 by means of a pump' the production of such stocks. I1 and forced through a line l8 to the upper part An object of my invention is to provide an of the column I as a re?uxing medium for the 30 improved method of producing a plurality of upwardly rising light constituents. Automatic grades of hydrocarbon stocks in a unitary frac tionating or stabilizing column. Anotherobject of my invention is the provision regulation of the liquid level in the receiver H may be accomplished by a liquid level regulat 30 of a new and improved fractionating or stabiliz ing column with a minimum of heat loss for use in the production of a multiplicity of hydrocar ically controlled valve 2| positioned in a line'22, through which that part of the liquid not desired bon stocks of different grades. _ ~ . With these and other objects in view, my in-' ing device I!) suitably connected to an automat as a re?uxing medium may be withdrawn from .35 the system. The liquid» constituents from the feed stock introduced into the column, as well as any‘heavy constituents from the re?uxing medium, pass vention will be described with reference to the accompanying drawing which illustrates a uni 40 tary apparatus for carrying the same into prac - downwardly through the reflux pipes 5 from one 40 tical effect, without limiting the improvements in fractionating zone to another until they reach their useful applications to the particular con the intermediate bubble plate 2“. The bubble struction which, for the purpose of explanation, plate 2a is- provided, with special re?ux lines '23 and 24, one on each side of the division plate 6. has been made the subject of illustration. Referring to the single ?gure, there is shown with each line being provided with a ?aring sec _ a fractionating or stabilizing column I having a plurality of bubble plates ,2 spaced therein to tion extending above the intermediate plate 2‘, 45 the purpose of which willv now be described. divide the column into a plurality of fraction ating zones 3. Each of the bubble plates 2 is provided with a number of hell caps 4 through As before mentioned, it is desirable in many instances to produce two grades of bottom stocks which upwardly rising vaporous products passing invention the liquid constituents collected on the through the column are conducted and a re?ux line 5 through which ‘liquid products from one intermediate plate 2“ may be divided into two portions, one portion thereof passing through the bubble plate, which is adapted to act as a reser voir for'liquid-products, are conducted to a simi line 23 into the section ‘I ‘and the other portion thereof passing through the line 24 into the sec lar lower bubble plate. ' The lower portion of the column I in accord ance with my invention is divided into sections. As shown, a division plate ii‘extends from the bottom of the column I to an intermediate bub in the same apparatus. In accordance with my 50 _ tion 8. The quantity of liquid passing into either of the ' sections'may be automatically controlled, if de sired. I have ‘shown an automatic control ar rangement which comprises a liquid level regu- . 2 2,134,882 lator 25 having a ?oat arm 26 suitably connected to a rod 21. The rod 21 is also connected to an' pors or any other suitable heat carrying me automatically controlled valve 28, in a draw-oil? line 29 for the section 8, and a bell crank lever 3| having a shaft 32 connected thereto. A suitable brace 3|“ may be secured to the side of the col umn l for supporting the control arrangement indicated on the drawing, may be introduced through a line 45 and passed through the re boiler 43 where it transmits heat to the liquid and keeping the shaft 32 in alignment. The shaft 321s connected to another shaft 33 having 10 arms 34 extending from opposite sides thereof. is well understood, the heat carrying medium and the liquid being heated are passed in indirect heat exchange with each other within the re passing therethrough, the spent heat carrying medium being withdrawn through a line 46. As The shaft 33 may be actuated by the shaft 32 through suitable gears, not shown. boiler 43. ' In order to control the amount of, heat, im Each of the parted to the liquid passing through the reboiler arms 34 is provided at the end thereof with a I have provided a temperature regulator arrange valve 35 adapted to fit into the ?aring portion 15 of the pipes 23 and 24. The arrangement thus described makes possi ble the maintaining of a constant level of liquid in the lower portion of the section 8. dium. The heat carrying medium, steam, being ment comprising a thermostatic, control means 15 41 suitably positioned in the outlet line 44 of the reboiler 43 which automatically controls a valve 49 in the line 45 through a connection 48, Thus if the liquid level in this section becomes too high, the . thereby admitting more or less heat carrying me ?oat arm 26 actuates the rod 21 which opens the dium, as the case may be. into the reboiler 43 20 valve 28 in the line 29 for withdrawing liquid for heating the ?uid passing therethrough. from this section and at'the same time depresses the valve 35 into the ?aring section of the reflux While I have shown and described automatic means for regulating the liquid levels in various parts of the apparatus as well as the quantity of pipe 24 thereby preventing too much liquid from ?owing through this section. If the level of liquid in the section 8 becomes too low, the re verse of that described will take place. It will be evident from the foregoing that a constant liquid level may always be maintained in the 80 lower portion of the section 8.‘ While the quantity of liquid entering the sec tion ‘I through the re?ux line 23 is dependent upon the setting of the valve associated with the heat carrying medium being introduced into the 25 reboilers, it is to be understood that manual means may be employed if desired. ' Moreover, while only two sections in the lower part of the column have been shown and de scribed, it is obvious that more than two sections 30 may be provided thereby permitting the produc tion of more than two grades of hydrocarbon stocks. ' From the foregoing description, it will be ap parent that I have provided a novel method and apparatus for simultaneously producing a multi plicity of grades of hydrocarbon stock. For in stance, if it is desired to produce two grades of gasoline, the gasoline or naphtha to be stabilized re?ux line 24, a constant liquid level may never theless be maintained in the lower portion of the section ‘I. As shown. a liquid level regulator 33 having a ?oat arm 31 is associated with the lower portion of the section 1. The arm 31 may be connected to a rod 38 which actuates an auto matically controlled valve 39 in a draw-off line ' is introduced into the column i and by properly 4| through which liquid may be withdrawn from adjusting the setting of the valves 35 associated the lower portion of the section 1. It will thus with the lines‘ 23 and 24 it is possible to regulate be apparent that a constant liquid level may be the quantity of liquid separately entering the sec maintained in each of the sections 1 and 8. The tions 1 and 8. By controlling the heating of the liquid passing from each of these sections through 45. levels of liquid maintained in these sections de pend upon the quantity of a particular grade of vthe reboiler 43 and back into the lower portion stock desired and-they may be varied within wide of the section‘ it will be~evident that different ranges in order to produce the desired quantity grades of gasoline ‘may be obtained. For exam ple, if summer grade gasoline made to certain of any particular stock. ‘ speci?cations has a tendency to vapor lock, it is Whatever grade' stock is desired from each sec 50 possible to produce a gasoline, such as a butane tion may be produced by controlling the tem . perature of the portion of the stock introduced absorption naphtha, in one of ~the sections of into each of the sections. In order to produce the column for back blending to thus obtain a ?nal product having the desired properties. Thus stocks having different compositions, I have pro 55 vided a reboiler arrangement for the- liquid being such a back blending stock may be produced in separately treated in each of the sections 1 and the lower portion of the section ‘I and withdrawn 3 thereby effecting a stripping action of the liquid through the bottom withdrawal line 4| as bottom in each section. The reboiler arrangement in stock A. Similarly the regular summer speci?ca cluding the necessary pipes is the same for each tion gasoline may be produced in the lower por tion of the section 8 and withdrawn through the 60 section and like reference characters will be applied to like parts of each of the reboilers. bottom withdrawal line 29 as a bottom stock 13. The litiuid collecting on the lowermost bubble My invention as before mentioned may be used' plate 2 may be withdrawn through a line 42 and passedthrough a reboiler 43 where it is heated by 65 a suitable heat carrying medium, from which it is conducted by a line ‘44 to the lower portion of the section from which itis withdrawn below to produce di?erent grades of lubricating stocks the lowermost plate 2. The thus heated liquid is collected in a body in its respective section and 70 the vaporized constituents, the quantity of which depends upon the degree of heating, pass up wardly through the bell caps provided in the steam required for producing the asphalt or low ering the ?ash point on one of the grades of lubricating oil would, be available in the upper part of the column for stripping the lighter con stituents from the feed stock from which both of the different grades of hydrocarbon stock are lowermost bubble plate 2. i The heat supplied to the reboiler 43 may be 75 steam, superheated steam, hot oil, diphenyl vva- v 40 45 50 55 60 having different ?ash points as well as different grades of asphalt. In these operations, steam 65 may be introduced directly into the lower portions of each of the sections 1 and 8 and the excess produced. _ Obviously many modi?cations will suggest 3 2,184,889 themselves to those skilled in the art but it is to be clearly understood that my invention is not to be limited to the precise details of construc tion and method of operation as many changes may be made without departing from the spirit of the invention, or exceeding the scope of the appended claims. I claim: _ ‘ stituents in each of said stripping zones to there by produce a different grade of hydrocarbon oil in each. . 4. The method of manufacturing a plurality of grades of hydrocarbon oils from an unre?ned supply stock which comprises, introducing said supply stock into a single fractionating column at an intermediate point thereof, vaporizing a por 1. A fractionating apparatus for producing a tion of said stock and collecting unvaporized liquid plurality of grades of gasolines comprising an elongated column, a continuous series of con tiguous bubble plates within said column, a par low the point of introduction thereof, passing separate portions of said liquid constituents into . tition within said column extending from the bot tom thereof to an intermediate bubble plate for 15 dividing the lower portion of the column into two‘ ‘ completely separated sections, means for intro ducing gasoline-containing oil to be treated into said column at a point above the said intermedi ate plate, separate conduits extending through 20 said intermediate plate and into said separate sec constituents thereof in said column at a point be 10 completely separated stripping zones in the lower portion of said fractionating column, regulating the quantity of liquid constituents introduced into 15 each of said stripping zones in response tov varia tions in the level of liquid collected in one of said zones, regulating the level of liquid constituents collected in another of said stripping zones by separately withdrawing liquid therefrom when 20 the level becomes too high, and separately heat tions for conducting a separate portion of liquid gasoline-containing oil ,collected on said inter _ ing the liquid constituents in each of said strip mediate plate into each of said separated sections, ping zones to thereby produce a different grade of hydrocarbon oil in each. means associated with said conduits for regulat 5. The method of manufacturing a plurality of 25 ing the quantity of gasoline-containing oil con v ducted into each of said separated sections, sepa_ rate means for heating the gasoline-containing oil being collected in each‘section foraltering the composition thereof to thereby produce two dif 30 ferent grades of gasoline-containing oil, means for simultaneously controlling the level of liquid col lected in one of said sections and the quantity of liquid being conducted thereinto, separate means for controlling the level of the liquid collected in the other section, and means for controlling the extent of heating of the liquid gasoline being col lected in each section. 2. In a single unitary fractionating apparatus for separating liquid mixtures wherein a continu ous series of contiguous fractionating elements is provided in a vertical column, the improvement comprising separate means within said column extending from the bottom thereof to‘ an inter mediate point for dividing the lower portion of 45 said column into a plurality of completely sep arated fractionating sections, means for intro grades of hydrocarbon oils from an unre?ned supply stock which comprises, introducing said supply stock into a single fractionating column at an intermediatevpoint thereof, vaporizing a por tion of said stock and collecting unvaporized 30 liquid constituentsthereof in said column at a point below the point of introduction thereof, passing separate portions of said liquid constitu ents into completely separated stripping zones in the lower portion of said fractionating column, 35 regulating the quantity of liquid constituents in troduced into each of said stripping zones in re sponse to the level of liquid collected in one of said zones, regulating the level of liquid constitu ents collected in another of said stripping zones by separately withdrawing liquid therefrom when the level becomes too high, separately heating the liquid constituents in each of said stripping zones to thereby produce a diirerent grade of hydro carbon oil in each, and controlling the extent of 45 heating to maintain a constant temperature in the ducing hydrocarbon ?uid to be treated into said . oil introduced into each of said stripping zones. column above said separated sections, means for dividing the liquid portion of the hydrocarbon fluid introduced into the column and conducting vthe parts thereof into eachrof the separate sec tions, means for regulating the quantity of liquid conducted into each of said separated sections, fractionating means associated with each of said sections for altering the composition of the hydro carbon liquid‘being collected therein, and means for simultaneously controlling the level of liquid collected in one section and the quantity of liquid being conducted thereinto. 60 3. The method of' manufacturing a plurality of grades of hydrocarbon oil from an unre?ned supply stock which comprises, introducing said supply stock into asingle fractionating column at an intermediate point thereof, vaporizing a por tion of said stock and collecting unvaporized liquid constituents thereof in said column at a point below the point of introduction thereof, " passing separate portions of said liquid constitu ents into completely separated stripping zones in 70 the lower portion of said fractionating column, 6. A fractionating apparatus for producing a plurality of fractions of hydrocarbon oils of dif ferent volatility or ?ash characteristics, which 50 comprises a bubble tower, a large number of con tiguous bubble plates within said tower, a parti tion within said tower extending from the bottom thereof to an intermediate bubble plate for di viding the lower portion of the tower into two completely separated fractionating sections, means for introducing the hydrocarbon oil to be fractionated into said tower at a point above said intermediate bubble plate, separate conduits ex tending through said intermediate bubble plate and into said separate sections for conducting a separate portion of liquid from said intermediate. bubble plate into each of said separated sections, means associated with said conduits for regulat ing the quantity of liquid conductedinto each of said separated sections, separate means for heat ing the liquids in each section to produce ?nished oils of different volatility or ?ash point, separate means for controlling the liquid level in-each of said sections, and means for separately controlling 70 regulating the quantity of liquid constituents in the extent of heating of the liquid in each of said troduced into each of said stripping zones in re heating means. sponse to the level- of liquid collected in one of said zones and separately heating the liquid con , DONALD A. MONRO. ' Patent No. "2,l5!i,882_ CERTIFICATE OF CORRECTION. ‘ DONALD A. MoNRof ‘ November 1, 1958. ’ It is hereby certified that error appearsin the printed specification of the ebove numbered patent requiring correction as follows: Page 5, first column, line 50, claim 1, for "gasoline-containing oil" read gasoline; and that the said Letters Patent should be'read with this correction therein that the same may conform‘ to the record of the case in the Patent Office. Signed and sealed this 20th day of December, 'A. D. 1958. Henry Van Arsdale (Seal) Acting Commissioner of Patents.