How is sulphuric acid manufactured by contact process?
contact process, modern industrial method of producing sulfuric acid; it has largely replaced the chamber, or lead-chamber, process. Sulfur dioxide and oxygen, passed over a hot catalyst, unite to form sulfur trioxide, which in turn combines with water to make sulfuric acid.
What is the purpose of contact process?
Complete answer: The purpose of the Contact process is to manufacture sulphuric acid. The Contact process is used in large scale preparation of sulphuric acid in the industries.
Why is contact process preferred over lead chamber process for the manufacture of sulphuric acid?
Earlier platinum was used as a catalyst for this reaction but it is susceptible to react with arsenic impurities in the sulfur feedstock. So now vanadium oxide V2O5 is preferred. The contact process is preferred to the previous lead chamber process because: The contact process also produces sulfur trioxide and oleum.
Why was the contact process developed?
The contact process was originally developed c. 1830 by Peregrine Phillips in England; it was little used until a need for concentrated acid arose, particularly for the manufacture of synthetic organic dyes.
Why as2o3 is used in contact process?
Nowadays vanadium pentoxide is used as a catalyst in the contact process. Its catalytic activity is not decreased due to the presence of arsenic impurities. So, it is more preferred.
Why is a catalyst used in the contact process?
– a catalyst is used. The conflict between increased yield and fast rate is resolved by the use of a catalyst. The use of a catalyst enables low temperatures to be used in the reaction vessel while maintaining a very high rate of reaction. A vanadium(V)oxide catalyst is used in the contact process.
Why is the contact process better than the lead chamber?
However, the lead chamber process is the old method, and it has now largely been replaced by the contact process. It is because the contact process is more economical and uses less expensive catalysts; not only that, this process produces sulfur trioxide and oleum as well.
What is the difference between contact process and lead chamber process for the manufacturing of sulfuric acid?
There are two major processes for sulfuric acid production: lead chamber process and contact process. The key difference between lead chamber process and contact process is that the lead chamber process uses gaseous nitrogen oxides as a catalyst, whereas the contact process uses vanadium pentoxide.
Why Platinum is not used in contact process?
The process of manufacturing of sulphuric acid in huge concentrations for commercial and industrial purposes is known as the contact process. The contact process uses Platinum as a catalyst but Platinum reacts with the arsenic (an impurity) which is present in the feedstock for Sulphur.
Why H2SO4 is used in contact process?
Sulfuric acid is soluble in water in all proportions and dilution of pyrosulfuric acid (Oleum) is done by the addition of sulfuric acid to water. So, we obtain the H2SO4 with the desired concentration. The contact process reaction occurred in this way to form the final product (H2SO4) of the desired concentration.
Why is H2SO4 used in contact process?
What is the contact process Igcse?
The contact process, for making sulfuric acid, is a process which involves a reversible reaction . The raw materials needed to make sulfuric acid are: sulfur. air.
How is the manufacture of sulphuric acid done?
Manufacture of sulphuric acid (H2SO4) by contact process In early days, sulphuric acid used to be maniufactured by lead chamber process. Contact process is modern method. The acid obtained is pure (free from impurities) and is quite concentrated (96-99%).
How is sulphur dioxide produced in the contact process?
When a reaction occurs sulphur dioxide is produced at the other end. The chemical reaction involved in this process is shown below: Melting and atomization. Production of sulphur dioxide using the hot furnace. This is a really delicate step in the contact process. This is partly because it produces corrosive sulphur trioxide.
What happens when sulfuric acid comes in contact with water?
It is soluble in water and releases heat on contact. On top of that, this acid is corrosive to metals and most other organic matters like tissue, wood, etc. On contact with such organic substances, sulphuric acid instantly dehydrates them causing char to form. Sulphuric acid has a density of 1.83 g / cm 3.
Why is sulphuric acid the king of chemicals?
Sulphuric acid is widely used chemical in industries. It is used in the manufacture of fertilizers, drugs, dyes, polymers, etc. thousands of tons of sulphuric acid is manufactured every year worldwide. So it is called king of chemicals. 1. Decomposition of H2SO4 :