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Sodium Manufaturing

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SODIUM

PROPERTIES

MOLECULAR WEIGHT : 11

MELTING POINT : 980C

BOILING POINT : 8830C

Sp. Gr : 0.927

APPEARANCE : Soft, waxy, silvery reactive metal.

It is highly reactive, burns with a yellow flame, reacts violently with water and oxidizes in air necessitating storage in an inert environment.

APPLICATIONS
Sodium in its metallic form is an essential component in the making of esters and in the manufacture of organic compound. This alkali metal is also a component of Sodium chloride (NaCl) which is vital to life. Other uses: • In certain alloys to improve their structure. • In soap, in combination with fatty acids. • To descale metal (make its surface smooth). • To purify molten metals. • In sodium vapour lamps, an efficient means of producing light from electricity. • As a heat transfer fluid in some types of nuclear reactors and inside the hollow valves of high-performance internal combustion engines.
NaCl, a compound of sodium ions and Chloride ions, is an important heat transfer material.
MANUFACTURING PROCESS

Traditional Method:
At the end of the 19th century, sodium was chemically prepared by heating Sodium Carbonate with Carbon to 1100 °C.
Na2CO3 (liquid) + 2 C (coke) → 2 Na (vapor) + 3CO (gas).

Current Practice:
It is now produced commercially through the electrolysis of liquid sodium chloride. This is done in a Down's cell in which the NaCl is mixed with calcium chloride to form eutectic mixture (mixture of 2 or more substance in certain composition) to lower the melting point below 600 °C.

The lower temperature makes it easier to collect chlorine and prevents sodium from forming fog that is difficult to recover. As Calcium is more electropositive than sodium, no calcium will be formed at the cathode. Electrolyte consists of 33.2 % NaCl and 66.8 % CaCl2.

Sodium – calcium mixture collects at the cathode, solubility of calcium in sodium decreases with decrease in temperature so that the heavier crystals of calcium settles back as the mixture is cooled.

The crude sodium is filtered at 105 – 110 C giving purity of 99.9 %.
This sodium is then allowed to solidify in inert atmosphere.

SODIUM CHLORATE

PROPERTIES

MOLECULAR WEIGHT : 94.5

MELTING POINT : 2480C

BOILING POINT : 3000C, Decomposes

APPEARANCE : White Powder which is readily soluble in water. When it decomposes, oxygen is librated and NaCl is left behind.

APPLICATIONS

Sodium Chlorate is an oxidizing agent.
It is mostly used to produce chlorine doixide for bleaching paper pulp, but is also used as a herbicide and to prepare other chlorates.

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