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 ?
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.
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.
The number and size of these settling ponds containing lethal amounts of naphthenic acids are growing daily.
The chemical structures of the naphthenic acids we tested varied.
Tailings contain sand, silt, clay, water and a host of toxic compounds, including residual bitumen, naphthenic acids, phenolic compounds, ammonia-ammonium and metals.
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.
Merichem Chemicals & Refinery Services LLC (MCRS), a wholly owned subsidiary of Merichem Company, provides a diversified portfolio of products and services including naphthenic acids, copper naphthenate, sodium hydrosulfide and process technology to the chemical, refining and pulp and paper industries worldwide.
Merichem Chemicals & Refinery Services LLC, a wholly owned subsidiary of Merichem Company, provides a diversified portfolio of products and services including naphthenic acids, copper naphthenate, sodium hydrosulfide and process technology to the chemical, refining and pulp and paper industries worldwide.