US1830925A - Art of treating hydrocarbon oils - Google Patents

Description

Nov. 1 0, 1931. o. c. BREwsTr-:R ET AL `1,830,925

ART OE TREATING HYDROCARON OILS Filed March 22, 1928 comps/vsn?,

Recs/v5@ Co/VE/YSEe i puede.: im

U f The l; me? l prent yinvention relates to improve a ments in the art' of liydrocarbon oils,

and will be fully understood from the folis covered m'our co-pending application, Se-

- ing, A indicates astill in which the oxidizing operation is carried on; -B indicates a pipe rial o. 263,766, for improvements in apparatus for treating hydrocarbon oils. f Referring more particularly to the drawstill; and C, aviiash drum.

The Sdu Aris divided by pum-.ion 1 .inw

compartment 2 and compartment 3, and the.

two chambers communicate with through the` overiiow pipe 4 -with which the partition 11is providedwBy means of theoveriiow pipe 4, which projects upward- '1y into chamber 3,2 body of liquid may be held in the bottom of compartment 3. (Jompartment 2 is'provided with a draw-oi pipe A other' oxygen-containmg gas duced into the still,'and a pipe coil 7 o, a perforated pipe throughwhich airor may be introi exteriorly .to the still andv communicating vtherewith through' pipes 8 and 9,. .Pipes 8 loil vfrom jthes com l 4 through p'pe 83nd the .coil 7 into the and 9 areA eachequipped with .valves by which communication with .the still may be cut-olf. A pump 10 may be employed to t 2 Stillthrovshpipe 9- 2 l Compartment is withY 11 whichl are preferahlyincline'd downward-n 1y; so that the'freshl oil which .is introduced near thetop of 4the pipe p through thejlengthof the compartment.

Vnapors ere drawn 'oil' through. vapor line 13` and condensed in' the condenser 14 from .whichhe condensate il'ows into the receiver 15'. y The receiver is provided with'a gas release-line 16and a liquid draw-o 17.

Both'compartments of the still A- are equi'pped with man-holes 18 which are closed plates 1 9. A-By meansof the two man- `21andfapum 22W.'

` makes contact with the 'vapors\that` are gen-f ro armeno omoonm, ol; mme. ranma, 01

holes, the mit@ dazed whmdddnfd.' Still A is preferably i force mate `withd P 3 through the pipe still 'andfinto thev ilashji `drum G- A ibinspipa 20,1 It is preferred, however, toxintroduce at an intermediate fpoint yin pipe still B9. 5 The flash drum U withthepipe still B-throughpp'e line 24." The .l is equippedl with a aspreadjerfconel 25 Aand a" 'vapor line 26; The'vaporsmay bedrewiioI` through the vapor line 26 and condenser 27, and -the condensate recovered in the receiver 'd 'drum 28, which is equipped with gas release line 29 4and 1i uid draw-olf line 30. The ilash' drum C is draw-olf line 31 Athrough whichJ heavy mate.-

rial '-at the bottomof the flash drum ma be'v returned to compartment'- 2. *Thef w-oi line is provided with a valve 32; 4 In the operation ofthe process, feed stock i enters compartments 3 ofthe still A- through The pipe By equippedwith a'residuum d line 12 and after filling the bottom portion ing closed.' When the compartment2 has jef the'compartment, overiloweV into comparta-f4 v ment 2, the valve 21'inline 20 preferably be-v sov been filled to the point at which pump 10 may f take suction'through line 8,- the oil is circu 1 lated'through the heating coil 7 until the oil has been brought to a-suitable temperature,

say 600 to 650 F. orfhigher, at which oxidation will begin on the supplying of air to the fresh oil continuously through *e PV 1y iP 12 so at the descending stream of oil, which follows a zig-zag'rcoui'sev along the baleslll,

icom- Seil. when the dii' id the-stmt revered` a-Y suitable temperature, air` is [supplied through the line6`in such volume asto main-v 12 may, be am fono' a zigzag Plth'tain the desired temperature in the still.`

A so; Circulation of the oil through the heatcoil 7 is thei discontinued.. It is,- preferre tions of the 'vapors from compartment. 2, pass up through vapor line 13, are condensed 1n condenser 14 and recovered in receiver 15.

The heavier fractions of the vapors from compartment 2 are condensed and returned with the stripped feed stock to the pool in the bot- `tom of compartment.v From the body of oil` formed, a stream of oil 'is pumped through pipe still B in which the temperature ofthe oil is raised to any desired high toprod'uce a gas oil distillate. Steam is introduced into the oil from line 23 'ust before it'enters the -pipe still. The hig y heated oil and steam, after leaving the pipe still B, pass through line 24 and are discharged preferably upon a spreader-cone 25. Vapors generated in the flash drum pass through vapor -line 26, are condensedin coils 27 and recovered in receiver 28. The residuum is drawn oif thro h line 31 and returned to compartment 2 w ene it is subjected to the oxidation operation. Material in the bottom of compartment 2may be withdrawn continuously or intermittently through the valve conftrolled residuum line 5. A

If desired, the valve 21 inl line-20 may be kept closed and the operation carried on without using the pipe stillrand iiash drum. In this met od of operation, the excess of the stripped feed stock and condensed heavier fractions of the vapors, which form the pool in the bottom of compartment 3, may pass into the oxidizing chamber 2 through the overow pipe 4.

The return line 31 from the flash drum is preferably lagged so that the material returned therefrom to compartment 2 ma retain as much of' its heat as possible. I the oil is raised to hightemperatures in the pipe s tilland the hot unvaporized portions relturned directly in a lagged conduit to the oxidation chamber, the added heat assists materially in keeping the oil in compartment operation may be carried on.

as the black oils of Wyoming. It is well` known, that in thedistillation of such stocks, moving said vapors, and returning the unthe gas oil cut obtainedis'dirty and unsatisfactory as charging stock for a pressurestill,

since the oxidation carries by entrainment large amounts of coky material into the vapor. In the operation of the process herein disclosed, a charging stock for pressure stills is obtained thatis quite satis actory.- The coky material isvtrapped by the "fresh feedl in compartment 3 along with the heavier gas still B the gasoil is 'redistilled and recovered as clean distillate from C, while the cokymaterial remains in the residue and'is recycled 'to theoxidizing chamber 2. The operation temperature, as, forexample, about 800 F.,

v containin gas, supplying within .the

2 at the temperature at which the oxidizing oil fractions which are condensed. Also,`on continuous distillation with steam in pipe is plllerabl continued untilcompartl'nent 2 is of co e.

It is not intended that the details of th process, as above set forth, shall be regarded as limitations upon the scope of the invention ing claims.

We claim: Y 1.. The method of' ltreating hydrocarbon oils which comprises maintaining a body of 1 except in so f ar as included in the accompanyoil, heating said body of oill until the oil body is .brought to a temperature of active, oxidation in the presence of a free oxygen containing gas, supplying within the body of oil controlled quantitles of free oxygen containing gas whereby said body of oil is maintained at the desired temperature, contacting the lvapors evolved therefrom with an incoming stream of fresh oil thereby condensin the heavier portions of said va ors, collecting said condensed vapors and resh oil to form a separate bod of oil, passin oilv from said separate y in a confine stream through a heating zone, discharging said stream of oil into an: enlarged chamber and separating the. vapors therefrom, removing said vapors, and returning'the unvaporizedfractions of the oil to the first, mentioned body of il.

2. The method of treating hydrocarbon oils which comprises, maintaining a bodyof oil, heating saldl body of oil until the oil bod isbrought to a temperature of active oxi ation infthe presence of a free gygen oil contro ed quantities of free oxygen containing gas whereby said body of oil is maintained at the desired temperature, contacting the vapors evolved therefrom with an incoming stream o'ffresh oil, thereby condensing the heavier portions of said va rs, collecting" said condensed va rs and fish oil to form-a separate body o -oil,withdrm ing oil from said se arate bod introducing steam into said wit drawn o'` and passin said withdrawn oiland steam in a confine stream through a heating zone, discharging said stream of oilinto an enlarged chamber and separating the vapors therefrom, re-

lll vaporized fractions of the oil to theiirst'mentioned lbody of oil. l

3. The method of treating hydrocarbon oils-which com rises, maintaining a body of v oil heatingsai body of oil until the oil body l is rought to a temperature of active oxidation 1in the-presence of a free oxy n containing gas, supplyingwithin the y of loilcontrolled quantities of free o n consaid vapors, returning the unvaporized fractions of the oil to the iiist mentioned body of oil.

4. The method of treating hydrocarbon l oils which comprises maintaining a body of oil, heating said body of oil until the oil bod is brought to a temperature of active oxi ation in the presence of a free ox gen containing gas, supplying within the bo y of taining as whereby said oil is maintained at the esired temperature, contacting the vapors evolved therefrom with an incoming stream of fresh oil, thereby condensing the heavy portions of said vapors, collecting said condensed vapors and fresh oil to form a separate body of oil, assing oil from said separate body in a con ned stream through a heating zone, discharging said fresh oil into anv enlarged chamber, removing the vapors therefrom, and returning the unvaporiz'ed portions hot to said, bod of oil.

5.l The method of pr ucing arclean distillate charging stockfrom a heavy asphaltic crude which coin rises, maintaining a bod of oil, heating said body of oil until the oil bod is brought to a temperature of active oxi ation in the presence of a free ox genv containin gas, supplying within the bo y of oil contro led uantities of a free oxygen conf taining gas w ereby the oil body is maintained at the desired teni erature, contacting the vapors evolved there rom with fresh oil, thereby condensing the heavier portions thereof, collecting said condensed portions and fresh oil in a separate ool, withdrawing a stream of oil from sai ool, introducing steam into said stream of oil, passing saidr oil and steam` through a heating zone, discharging said stream into an enlarged chamber, separating the vapors therefrom, and retirn'iig the unvaporized .portions to said body o o1 6. The method of treating hydrocarbon y oil, heating sai body'of oil and then supplying thereto a free oxygen containing gas to maintain said oil at conversion tem ratures, removing the vapors evolved therefI-)re j tacting said vapors with M through a' heatingv zone, said l oil controlled quantities of free oxygen con' oils which com rises, maintaining a body of om, cona stream of income v ing fresh stock, thereby strippin said fresh stream of oil into an enlarged unheated chaini-V ber and separating the vaporstherefrom, re-

moving said vapors, and returning the unvaporized fractions of the oil to the firstlmentioned body of oil.' 4

7. The method of treating hydrocarbon oils which comprises, maintainino` a body of oil, heating said body of oil and then supplying thereto a free oxygen-containing gas to maintain said oil at conversion temperatures, removing the vapors evolved therefrom, contacting said vapors with a stream of incoming f fresh stock, thereby stripping said fresh stock of light vapors and condensing the heavy portions of said evolved vapors, removing the said stripped vapors and the li hter fractions of said evolved vapors, collecting the condensed heavier fractions of said evolved vapors and said stripped fresh stock in a sep' brought to a temperature of active 'oxidation in the presence of-an oxidizing gas, supplying Within the body of oil controlled-quantities of oxidizing vgas whereby said oil is maintainedat the desired tem eratures, removing the vapors evolved there rom and Contactin them with a stream of fresh oil whereby sai oil is preheated, withdrawing said preheated fresh oil and passing it through a heated zone and then into an enlarged chamber, removing vapors therefrom, and returning the unvaporized portions hot to said body of oil.

In testimony whereof, we have hereunto set our hands this 15th day of'March, A. D.

' OSWALD' C. BREWSTER.

WILLIAM M. VVPERRY.'

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