US1718713A

US1718713A - Preparing hydrocarbon products

Info

Publication number: US1718713A
Application number: US689590A
Authority: US
Inventors: Simpson James
Original assignee: Standard Oil Development Co
Current assignee: Standard Oil Development Co
Priority date: 1924-01-30
Filing date: 1924-01-30
Publication date: 1929-06-25
Anticipated expiration: 1946-06-25

Description

Patented June 25, 1929.

PATENT OFFICE.

UNITED STATES JAMES SIMPSON, F LINDEN, NEW JERSEY, ASSIGNOR T0 STANDARD OIL DEVELOP MENT COMPANY, A CORPORATION OF DELAWARE.

PREPARING HYDROCARBON PRODUCTS.

No Drawing.

This invention relates to the preparation of petroleum distillates, and more particularly finishing light products.

, Various undesirable compounds occur in petroleums of different sources and impart in some cases detrimental characteristics to the products. Certain naphthas, for instance, contain organic sulfur compounds of more or less malodorous character and are sour,

according to refiners terminology. Other naphthas, for instance, may not be sour, but may exercise a. corrosive action on copper, due to presence of sulfur in combinable form.

In accordance with the present invention petroleum distillates with objectionable con stituents, as aforementioned, can be advantageously and simply brought to a satisfactory condition.

The practice of the invention will be illustrated by an example which sets forth the principle involved: A cracked naphtha distillate, not treated with sulfuric acid, which contained constituents causing it to be sour, was treated with about 1% of a sodium plumbite solution or doctor solution made by dissolving about 1 lb. of litharge in 3 gals. of 15 B. aqueous caustic soda solution. By sodium plumbite or doctor solution I mean any of the solutions of lead oxide in caustic alkali that are suitable for use in treating hydrocarbon oils. After thorough agitation, settling was allowed to occur and the doctor solution was drawn off below. The naphtha was then sweet. This used doctor solution was now in turn mixed in the proportion of about 5% with a naphtha containing corrosive sulfur, and after thorough agitation, settling was allowed to occur and the doctor solution was drawn off below. This naphtha was then free from corrosive action.

In general usage it will be understood that the proportions of treating agent may be varied in accordance with the requirements of particular distillates to be treated.

I am, at present, unable to state just what the ultimate mechanism of the action is, and without committing myself definitely to any theory, merely suggest that the organic sul- Application filed January 30, 1924. Serial No. 689,590.

fur compound in the sour naphtha appears to react with the lead-soda compound of the doctor solution to form an unstable compound with which the sulfur of corrosive naphtha in turn can readily combine. It is well understood in the art that such sulfur cannot ordinarily be removed by treatment with the usual doctor solution.

It is important that the sour distillate or sour cracked distillate should not be treated with sulfuric acid before receiving the doctor solution treatment; and it is desirable that the doctor solution which has been used on the sour distillate should be used within a few days for treating the corrosive distillate, since the active compound is unstable, and on standing gradually spontaneously decomposes and the solution is then inert.

While I have described my invention by reference to certain specific details, it will be understood that this is illustrative, and that changes can be made which come within the spirit and scope of the invention.

IVhat I claim is:

1. The process of preparing petroleum distillates, which comprises subjecting a sour naphtha distillate to the action of a sodium plumbite solution, separating the said solution, and then subjecting a naphtha distillate containing corrosive sulfur to the action of the same solution.

2. The process of preparing petroleum distillates, which comprises subjecting a naphtha distillate, containing sulfur in corrosive form to the action of a sodium plumbite solution previously used to treat a sour c 'ackcd naphtha.

3. The process of preparing petroleum distillates, which comprises subjecting a distillate containing sulfur in corrosive form to the action of a sodium plumbite solution which has been used to treat a sour distillate.

4c. The process of preparing a non-corrosive petroleum distillate, which comprises treating a corrosive distillate with a sodium plumbite solution containing constituents of a sour petroleum oil.

JAMES SIMPSON.