US1974777A - Method of treating lubricating oils - Google Patents

Description

Patented Sept. 25, 1934 UNITED STATES PATENT OFFICE METHOD OF TREATING LUBRICATING OILS tion of Delaware No Drawing.

Application November 5, 1928,

Serial No. 317,485

7 Claims. (Cl. 196-151) This invention relates to improvements in a method of treating lubricating oils.

Heretofore red oils have often been produced by blending bright stock with the neutral or pale oil stock. The addition of the bright stock increases the carbon residue and also increases the cost of production.

It is the object of the present invention to provide a process of treating lubricating oils to produce from a neutral stock an oil which has a red tint with a greenish fluorescence by utilizing the coloring matter contained in a cracked petroleum residue to impart the color to the neutral oil stock.

The method of procedure consists in thoroughly agitating a quantity of a cracked petroleum residue or fractions of same (for example, a residue from the well known Dubbs cracking process) with a quantity of neutral stock and then subjecting the mixture after thorough agitation to an acid treatment, followed by a contact treatment with filter clay. As a result of this procedure the lubricating oil is given a red tint and a greenish fluorescence. Sincethe coloring of the oil results from the color bodies obtained from the cracked petroleum residue there is no appreciable modification of the normal viscosity or the flash and firepoint of the oil.

As a detailed method of procedure it has been found preferable to first draw of! the cracked residue of a petroleum cracking process into a separate vessel or container while hot and to subject the residue to a distillation to drive off the lighter fractions. This prevents lowering the flash and fire point of the finished lubricating oil when the residue is mixed with the neutral stock. The residue stripped of the lighter fractions is then introduced while hot into a body of neutral oil stock of two to three times its volume and the mixture is thoroughly agitated. This mixture is then introduced into the main body of neutral oil stock to be treated so that the amount of the residue in the main body of neutral stock will vary between the limits of 0.10% to 10% by volume. The mixture is then given an acid treatment followed by a contact treatment with filter clay.

The term cracked petroleum residue as used here, and as understood in the art, refers to a particular product, the residue from a cracking process operating on crude petroleum or topped crude.

It will be understood, therefore, that the method here disclosed is one that may be very economically operated and that the result of the process is a lubricating oil having a satisfactory color and which oil is lower in carbon content than the red oils made under many of the present known processes. The introduction of the coloring matter as above pointed out does not appreciably modify the normal viscosity nor does it change the flash or fire point of the oil.

What I claim and desire to secure by Letters Patent is:

1. A method of treating lubricating oil which consists in mixing and agitating neutral oil stock with a cracked petroleum residue, and then subiecting the mixture to an acid treatment, and then subjecting the mixture to a contact treatment with filter clay.

2. The method of treating lubricating oil to impart thereto a red tint and a greenish fluorescence which consists in mixing with a neutral oil stock a quantity of a cracked petroleum residue, and then finishing the oil by an acid and contact treatment.

3. The process of treating a neutral oil stock which consists in adding thereto a quantity of a cracked petroleum residue from which the light fractions have been stripped, thoroughly agitating the mixture, and finishing the oil by an acid and contact treatment.

4. The continuous process of producing a lubricating oil having a red tint and greenish fluorescence which consists in'agitating a quantity of neutral oil stock with a cracked petroleum residue while hot, and then finishing the oil by a contact treatment with filter clay.

5. The continuous process of producing a lubricating oil which consists in combining a quantity of neutral oil stock in the unfinished state with a cracked petroleum residue, the volume of the cracked petroleum residue being 10% or less of the total volume, and then finishing the oil by a contact treatment with filter clay.

6. A method of treating lubricating oil which consists in mixing and agitating neutral oil stock with a cracked petroleum residue, and then subjecting the mixture to an acid treatment, and then subjecting the mixture to a neutralizing treatment.

7. As a new article of manufacture, lubricating oil containing a cracked petroleum residue, said cracked petroleum residue having color bodies imparting a green fluorescence to the oil and producing no appreciable modification of the normal viscosity or the flash and firepoint of the oil.

WILLIAM O. KEELING.