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Sulphur

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Sulphur
Sulphur

Sulphur is a non metal element in group 6 of the periodic table. Sulphur has many useful properties which make it widely used in the industry.

Sources of Sulphur:

Sulphur is found in many places in the world in different forms. It usually exists in volcanic regions in USA, Mexico and Sicily. Sulphur could also be obtained from some metal ores like Copper pyrites (CuFeS2) and Blende (ZnS).

Properties of Sulphur:

In room temperature, sulphur is a yellow, brittle solid which doesn’t conduct electricity as it is a non-metal. Sulphur is insoluble in water. It is able to react with both metals and non-metals.

Sulphur Dioxide:

Sulphur dioxide is the product of combustion of sulphur or sulphur-containing fuels. As you have studied in the previous chapter, it is an air pollutant as it causes acid rain. However, SO2 has important uses too:

Bleaching wood pulp for the manufacturing of paper
It is used as a food preservative as it kills bacteria
Manufacturing of Sulphuric acid

Contact Process (Manufacturing of Sulphuric Acid):

Sulphuric acid is one of the most important chemicals in the industry since it has a role in the manufacturing of almost every product. Sulphuric acid is manufactured by a process called Contact Process and it involves several steps:

Making the sulphur dioxide
Converting the sulphur dioxide into sulphur trioxide
Converting the sulphur trioxide into sulphuric acid
1. Making the sulphur dioxide

Sulphur is first burned in air producing sulphur dioxide:

S(s)+ O2(g)→ SO2(g)

2. Converting the sulphur dioxide into sulphur trioxide:

This is a reversible reaction, and the formation of the sulphur trioxide is exothermic.

2SO2(g) + O2(g) ⇌ 2SO3(g)

3. Converting the sulphur trioxide into sulphuric acid

This can't be done by simply adding water to the sulphur trioxide - the reaction is so uncontrollable that it creates a fog of sulphuric acid. Instead, the sulphur trioxide is first

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