US2081218A

US2081218A - Method for stabilizing motor fuel against gum formation

Info

Publication number: US2081218A
Application number: US703713A
Authority: US
Inventors: Robert E Burk
Original assignee: Standard Oil Co
Current assignee: Standard Oil Co
Priority date: 1933-12-23
Filing date: 1933-12-23
Publication date: 1937-05-25
Anticipated expiration: 1954-05-25

Description

R. E. BURK May 25, 1937.

METHOD FOR STABILIZING MOTOR FUEL AGAINST GUM FORMATION Filed Dec. 23, 1935 y INVENTOR.

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Patented May 25, 1937 UNITED STATES PATENT OFFICE METHOD FOR. STABILIZING MOTOR FUEL AGAINST GUM FORMATION Robert E. Burk, Cleveland, Ohio, assignor to The Standard Oil Company, Cleveland, Ohio, a corporation of Ohio In the customary methods of producing motor fuel by cracking petroleum, there is a formation of unstable gum-forming byproducts which subsequently require particular treatment if their resultsare to be avoided. Even this is not always Wholly effective. I have now found however, how,-

to produce motor fuel by cracking without the undue formation of gum-components.

To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fully described, and particularly pointed out in the claims, the following de- Scription and the annexed drawing setting forth in detail an illustrative embodiment of the in- 25 vention, this being indicative however, of but one of the various ways in which the principle of the invention may be employed. l

In said annexed drawing:- The sole figure is a semi-diagrammatic eleva- 20 tional view of apparatus contemplated in the inlVention.

Cracking stock as desired, for example gas oil, is subjected to cracking which for desirable efciency may be represented by subjection first 25 to a heating zone 2 and then to a digesting zoneV 3. From the digesting zone, in accordance with the present invention, the highly heated products proceed to a high pressure zone or drum 4 in which a highpressure is maintained and an ele- 30 vated temperature. For instance, the pressure may be ZOO-1500 pounds per square inch and the temperature 60G-850 F. From the high pressure Zone 4, the products pass through a pressuredrop valve 5 to a tar separator 6. Vapors dis- 35 engaged here proceed on through the fractionating zones l, 8, and various cuts are taken off, and finally the motor fuel hydrocarbons pass from condenser 9 to receiver I II which may have a pressure of 0-200 pounds per square inch. From 40 the receiver I0, all or a portion of the motor fuel condensate is returned by pump I I to again enter the high pressure high temperature zone 4, there `to mix with the other hydrocarbons in highly heated condition, and under favorable conditions for inter-reaction. The motor fuel then finally taken off after the vapors have proceeded through the separator 6 and the fractionating zones 1, 8, and condenser 9, is found to have its gum-form- 5 ing tendency checked, due apparently to reaction by the sensitive gum-forming parent substances. The motor fuel may be recycled one or more times as desired back through the high pressure zone 4.

As a further refinement of the invention, tarry 'i0 material or the like Withdrawn from separator 6, or from the bottom of the high pressure zone 4 may be subjected to a vacuum stripping zone I2, from whence the vapors proceed through fractionating zones I3, I4, each taking out its respective fraction, and the motor fuel hydrocarbons as finally condensed in zone I5 proceed to receiver I6, all this portion of the system being under reduced pressure from the vacuum line II on the gas draw-off. Again, all or a portion of the motor fuel hydrocarbons may be forwarded by a pump I8 back to recycle through the high pressure zone 4, one or more times as desired.

Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in the following claim, or the equivalent of such, be employed.

I therefore particularly point out and distinctl claim as my inventiom- A process of gum-stabilizing motor fuel, which comprises heatingheavy hydrocarbons to cracking temperature, digesting the hot hydrocarbons under pressure in an unheated zone, passing the products to a further pressure zone without temperature increase, maintaining the products from such pressure zone in uid state, then dropping the pressure, fractionating gasoline from the products, and passing such gasoline again through said pressure zone to contact with the hot freshly cracked fluid products.

ROBERT E. BURK.