US1872679A - Process of refining petroleum distillates - Google Patents

Description

Patented Aug. 23, 1932 7 UNITED STATESiFATE-N'lfore- E LEO r. OHEIBOTAREF, or new YORK, N. Y; AssIsNoR TO THE TEXAS,GOMPA1\TY,..OF NEW YORK, n. Y., A oonroaArIon-or DELAWARE PROCESS OF REFINING PETROLEUM DISTILLATES No Drawing.

This invention relates to a process for refining distillates,such for example as gasoline, kerosene and lubricating oils derived from petroleum, shale oil and other oils from min- 5 era-l sources. The invention further relates to the method of treating the raw distillates prior to the usual refining treatment, or to the treatment of such distillates after the customliminarily wash the gases for the removal of the sulphur dioxide and other impurities.

ary refining treatment, to deodorize the distillates and render them of pleasant smell.

In the usual refining of distillates from petroleum such as gasoline, kerosene and lubricating oils, they are first treated with strong sulphuric acid and after separation of the resultant sludge the oil is neutralized with an alkaline reagent such ascaustic soda or sodium carbonate, or in many instances, particularly in the case of the light fuel distillates, are treated with a solution of litharge in caustic soda, forming sodium plumbite,

and generally termed doctor solution. Usually such refining treatment is sufficient to produce a final product which is satisfactory from the standpoint of odor. In certain instances, however, in case the distillate has been derived from a crude petroleum relatively rich in nitrogen compounds,the distillates, after the above described refining treatment, have a repulsive odor which may be due to the presence of organic bases, such for example as amino compounds.

In order to deodorize such distillates and render the same suitable for general use, I have found that a treatment with a reagent capable of furnishing carbon dioxide is entirely effective.

Although I do not'desire to be restricted to this theory in the interpretation of the appended claims, the reaction may be interpreted as a neutralization of the organic bases by the carbon dioxide, thus forming the salts of such bases which may be substantially odorless, or which may be soluble in the water solution of the reagent and thus be removed from the Oil.

This treatment of the distillates may be accomplished in several ways. In case it is desired to furnish the necessary carbon dioxide to the distillate through means of an 50 acid salt of this material, the distillate may Application filed December 27, 1927. serial No. 242,965.

be treated with a solution, preferably 'saturated of sodium bicarbonate in water; it

mayalso be treated with water saturated with carbon dioxide, or indeed the dry gas may "be passeddirectly into the distillate. In some instances it may be desirable to use waste combustion gases rich in carbon dioxide, and in such "caseslt is perhaps preferable to pre- I am aware of the practices of the prior art in which distillates have been neutralized after acid treatment with sodium carbonate.

' This reagent, however, as well known, has a in 'efiect to a weaker caustic soda. Sodium carbonate, therefore, leaves the distillate in the same condition of alkalinity as caustic soda or plumbite solution. It is therefore unsuited to accomplish the purposes of my invention.

It has also been suggested to neutralize the distillates with sodium bicarbonate, which in effect would leave the distillates in a slightly acid condition due to the presence of free carbon dioxide, and if such distillates contain organic bases they will be combined with the carbon dioxide and will consequently have a good odor. Such treatment, however, is not feasible in commercial operations, especially in the refining of gasoline, owing to the large volumes of carbon dioxide which would be given off during neutralization of the acid and consequent volitization of the lighter portions of the fuel.

My invention, therefore, is applicable to those distillates which have been neutralized after acid treatment with caustic soda, sodium carbonate, sodium plumbite, lime and the like, as well as to the treatment of the raw distillates prior to the customary refining and to natural gasolines or gasolines derived from natural gas.

Investigation has resulted in the disclosure that my invention is of value in thus cleodor-. izing a number of crude and refined distillates and rendering them more valuable in the trade.

Obviously many modifications and variations of the invention, as hereinbefore set.

forth, may be made without departing from the spirit and scope thereof, and therefore, only such limitations should be imposed as are indicated in the appended claims.

What I claim is:

1. The process of deodorizing light distillates derived from petroleum and the like after acid treatment, which distillates have previously been subjected to a refining treatment including a final step of treating with an alkaline reagent composed solely of aqueous caustic soda, consisting of washing the distillate with an aqueous solution of sodium bicarbonate.

2. The process of refining light distillates derived from petroleum and the like, comprising treating the distillate with an acid refining reagent, neutralizing the distillate with a strong alkaline refining reagent, and thereafter washing the distillate with an aqueous solution of sodium bicarbonate, whereby the distillate becomes deodorized.

3. The process of refining light distillates derived from petroleum and the like, comprising subjecting the distillate to an acid refining treatment, sweetening the acid treated distillate with sodium plumbite and thereafter washing the distillate with an aqueous solution of bicarbonate to effect deodorization thereof.

In witness whereof I have hereunto set my hand and seal this 17th day of December,

LEO P. CHEBOTAREF.

warm-care or connecrion.

Patent No. 1,872,679. August 23, 1932.

LEO P. CHEB OTAREF.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 29, claim 3, before the word "bicarbonate" insert the word "sodium"; 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 13th day of December, A. D. 1932.

M. J. Moore,

(Seal) Acting Commissioner of Patents.