CAS Number 1310-73-2
·
Linear Formula NaOH
·
Molecular Weight 40.00
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EC Number 215-185-5
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MDL number MFCD00003548
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PubChem Substance ID 329824595
Sodium hydroxide (NaOH),
also known as lye and caustic
soda, is an inorganic
compound. It is
a white solid and highly caustic metallic base and alkali of sodium which is
available in pellets, flakes, granules, and as prepared solutions at different
concentrations.
Detailed description
Sodium hydroxide forms an approximately 50% (by mass) saturated
solution with water.[11]
Sodium hydroxide is soluble in water, ethanol, and methanol. This alkali is deliquescent and readily absorbs moisture and carbon dioxide in air.
Sodium hydroxide is used in many industries, mostly
as a strong chemical base in the manufacture
of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner. Worldwide production in 2004 was approximately 60 million tonnes, while demand was 51 million tonnes.
Uses
Sodium hydroxide is a popular strong base used in industry.
Around 56% of sodium hydroxide produced is used by industry, 25% of which is
used in the paper industry. Sodium hydroxide is also used in the manufacture of
sodium salts and detergents, pH regulation, and organic synthesis. It is used
in the Bayer
process of aluminium production.[12] In bulk, it is most
often handled as an aqueous solution,[17]since solutions are cheaper and easier to handle.
Sodium hydroxide is used in many scenarios where it
is desirable to increase the alkalinity of a mixture, or to
neutralize acids.
For example, in the petroleum industry, sodium
hydroxide is used as an additive in drilling
mud to increase alkalinity in bentonite mud systems, to
increase the mud viscosity, and to neutralize any acid
gas (such as hydrogen
sulfide and carbon
dioxide) which may be encountered in the geological formation as drilling
progresses.
Poor quality crude
oil can be treated with sodium hydroxide to remove sulfurous impurities in a
process known as caustic
washing. As above, sodium hydroxide reacts with weak acids such as hydrogen
sulfide and mercaptans to yield non-volatile sodium salts, which can be
removed. The waste which is formed is toxic and difficult to deal with, and the
process is banned in many countries because of this. In 2006, Trafigura used the process and
then dumped the waste in Africa.
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