Naphthenic Acids

Naphthenic Acids

 

carboxylic acids (usually monobasic) of the alicyclic series, containing one or more five-member (less frequently, six-member) hydrocarbon rings—for example,

Naphthenic acids are the main oxygen-containing components or petroleum (content in petroleum, 0.5–3.0 percent), from which they are extracted in the form of salts (naphthenates) by means of an aqueous solution of an alkali. Naphthenic acids are viscous, colorless liquids that turn yellowish upon standing. Boiling point, 220°-300°C; pour point, < 80°C. They are virtually insoluble in water but dissolve readily in petroleum products and other organic solvents. They have all the properties characteristic of carboxylic acids.

Naphthenic acids are used to a limited extent for demulsification of petroleum and impregnation of crossties, and also as solvents for resins and gums. Salts of naphthenic acids are most widely used. Salts of alkali metals (alkaline naphthenates) are used to wash wool and as emulsifiers and disinfectants; salts of lead, manganese, cobalt, and zinc serve as desiccants in the preparation of oil paints; copper salts are used in the impregnation of wood, cables, and fabrics to prevent rotting; and lead and aluminum salts serve as special additives in the preparation of lubricating oils and fuels.

References in periodicals archive ?
At high concentrations, salts and naphthenic acids would potentially affect fish and other aquatic life.
Tailings contain a host of toxins including bitumen, naphthenic acids, cyanide, phenols and metals such as arsenic, cadmium, chromium, copper, lead and zinc.
The working assumption behind this treatment strategy is that radiation efficiently disrupts the cyclic structure of constituents within naphthenic acids, neutralizing their toxic effect and leaving the local environment clear for biological activity.
In her work, she proved that this concept could be used to break down the toxic naphthenic acids that occur in oil sands tailings water 14 times more quickly than occurs naturally when tailings are stored in conventional ponds.
This book reviews the identification of naphthenic acids in crude oil and their influence on refinery process units.
Additionally, exposure to chemical compounds, such as naphthenic acids, primary sclerosing cholangitis, anabolic steroids, ulcerative colitis, intrahepatic lithiasis, Caroli disease and multiple liver cysts are other recognized predisposing factors for the development of cholangiocarcinomas in humans (AL-BAHRANI et al.
These xenobiotic compoundsmight be formed during microbial attack of some important groundwater pollutants, such as fuel oxygenate ethers, alkyl phenols, naphthenic acids and related compounds all possessing already a tertiary alcohol group or an aliphatic side chain which could be converted to it in the course of degradation.
As it is well known [12], the carboxylic and naphthenic acids are important surface active substances (SASt) and petroleum fluid components, and for solvation of the oil and gas hydrocarbons they form insoluble salts with the divalent calcium ([Ca.
Influence of basic catalysts on the decarboxylation kinetics of naphthenic acids
The most toxic of these are a mixture of compounds known as naphthenic acids that are resistant to breakdown and persist as pollutants in the water used to extract the oils and tar.
Merichem Chemicals & Refinery Services LLC, a wholly owned subsidiary of Merichem Company, provides a diversified portfolio of products and services including innovative process technology and engineering, caustic management, naphthenic acids, copper naphthenate, and sodium hydrosulfide to the refining, chemical, and pulp and paper industries worldwide.
Photocatalysis, "a chemical reaction that involves the absorption of light by nanoparticles" was found to breakdown the naphthenic acids that contaminate wastewater, the removal of which is one of the largest environmental challenges in Canada according to Tim Leshuk, lead author of the study.