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Treatment of hydrocarbons containing acids

a technology of hydrocarbons and acids, applied in the field of hydrocarbons treatment, can solve the problems of slow reaction rate and difficulty in efficient treatment, and achieve the effect of minimizing or eliminating corrosion in down-stream plants and equipment, and simple operation

Inactive Publication Date: 2010-06-24
HER MAJESTY THE QUEEN & RIGHT OF CANADA REPRESENTED BY THE MIN OF NATURAL RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0037]As the method requires a simple operation under mild conditions, and may be carried out in simple apparatus (stirred tanks, and the like), it may be used to remove naphthenic acids from hydrocarbons in remote locations where the hydrocarbons are first collected. This minimizes or eliminates corrosion in down-stream plant and equipment.Definitions

Problems solved by technology

Bitumen may contain other components, such as fines and asphaltenes, and may then be difficult to treat efficiently.
If the oil solubility is low, the rate of reaction may be slow.

Method used

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Examples

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examples

[0051]In the following Examples, all chemicals were purchased from Sigma Aldrich® and used without alteration. The properties of the HVGO used are listed in Table 1. All experiments were conducted following the procedure below:[0052]1. Bromobutane and heavy vacuum gas oil (HVGO) were added in a flask. The mixture was heated to 80° C. in an oil bath under stirring.[0053]2. PTC (tetrabutylammonium bromide) was completely dissolved in NaOH aqueous solution, and added to the flask prepared in 1.[0054]3. The above mixture was stirred at 80° C. for 4 hours.[0055]4. After reaction, the flask was quenched with cold water and the contents transferred into a centrifuge bottle.[0056]5. The water was separated from oil using an IECCR-6000® centrifuge (3800 rpm for 30 min).

[0057]The oil phase was analyzed for TAN, sulfur, nitrogen, and boiling range. The nitrogen and sulfur were analyzed according to ASTM D4629 (syringe / inlet oxidative combustion and chemiluminescence detection), and ASTM D4294 ...

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Abstract

The invention relates to a method of treating a liquid hydrocarbon (e.g. heavy oil, bitumen, etc.) containing naphthenic acids or other corrosive acids in order to partially or fully convert such acids into non-corrosive compounds. The method comprises adding an alkylating agent to the hydrocarbon, bringing the hydrocarbon into contact with an aqueous liquid containing an alkaline compound and a phase transfer catalyst to form an immiscible two-phase system, maintaining the contact to allow conversion of the naphthenic acids to non-corrosive oil-soluble esters, and separating the aqueous phase from the liquid hydrocarbon. Naphthenic acids are highly corrosive to plant and equipment and the method enables them to be converted to non-corrosive compounds in an economic manner.

Description

BACKGROUND OF THE INVENTION[0001](1) Field of the Invention[0002]This invention relates to the treatment of hydrocarbons, such as crude oil, bitumen, distillates, organic solvents, etc., containing corrosive acids. More particularly, although not exclusively, the invention relates to the treatment of hydrocarbons derived from natural sources containing naphthenic acids.[0003](2) Description of the Related Art[0004]Naphthenic acids (NAs) occur naturally in crude oils, especially heavy crude oils and bitumens. The amount of acid in a hydrocarbon of this kind is usually represented by the Total Acid Number (TAN). The presence of naphthenic acids in such hydrocarbons is disadvantageous because they cause severe corrosion problems in refinery equipment, transfer pipelines, and the like. Moreover, naphthenic acids act as surfactants and disadvantageously stabilize emulsions when the hydrocarbons are contacted with water, e.g. during desalting operations. Removing naphthenic acids or signi...

Claims

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Application Information

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IPC IPC(8): C10G17/00
CPCC10G75/02C10G19/02
Inventor DING, LIANHUIYANG, HONGPARVIZ, RAHIMICZARNECKI, JAN
Owner HER MAJESTY THE QUEEN & RIGHT OF CANADA REPRESENTED BY THE MIN OF NATURAL RESOURCES
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