Difference Between 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. ... However, the lead chamber process is the old method, and it has now largely been replaced by the contact process.

1. Why is the contact process better than the lead chamber?
2. What is meant by contact process?
3. Why is it called the contact process?
4. What are the conditions for the contact process?
5. Which catalyst is used in lead chamber process?
6. What is the catalyst for the lead chamber process of h2so4?
7. Why As2O3 is used in contact process?
8. Why v2o5 is used in contact process?
9. Is the contact process exothermic?
10. Why is so3 not added directly to water?
11. Who discovered the contact process?
12. Why Platinum is not used in contact process?

Why is the contact process better than the lead chamber?

The contact process is used to produce sulfuric acid in the high concentrations required for industrial processes. ... The contact process is preferred to the previous lead chamber process because: 1. It is much more economical.

What is meant 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.

Why is it called the contact process?

The term "contact process" stems from the fact that the usually solid catalyst is also called a "contact" in a heterogeneous cataly- sis. As the demand for sulfuric acid could be met by the lead chamber process in the middle of the 19th century, there was initially no incentive to develop the process further.

What are the conditions for the contact process?

The process can be divided into six stages:

• Combining of sulfur and oxygen (O₂) to form sulfur dioxide.
• Purifying the sulfur dioxide in a purification unit.
• Adding an excess of oxygen to sulfur dioxide in the presence of the catalyst vanadium pentoxide at 450 °C and 1-2 atm.

Which catalyst is used in lead chamber process?

Therefore, we can conclude that nitric oxide i.e. NO is used as a catalyst in the lead chamber process for the production of sulphuric acid.

What is the catalyst for the lead chamber process of h2so4?

Chamber process, also called Lead-chamber Process, method of producing sulfuric acid by oxidizing sulfur dioxide with moist air, using gaseous nitrogen oxides as catalysts, the reaction taking place primarily in a series of large, boxlike chambers of sheet lead.

Why As2O3 is used in contact process?

A promoter increases the activity of a catalyst while the substance which reduces the catalytic activity is called poison. Thus, As2O3 acts as a catalytic poison in contact process during the formation of sulphur trioxide and the correct option is (b) catalytic poison.

Why v2o5 is used in contact process?

Vanadium pentoxide is used in different, industrial processes as catalyst: In the contact process it serves for the oxidation of SO₂ to SO₃ with oxygen at 440°C. Besides it is used in the oxidation of ethanol to ethanale and in the production of phthalic anydride, polyamide, oxalic acid and further products.

Is the contact process exothermic?

The Contact process is the process during which sulphur trioxide (SO₃) is formed from sulphur dioxide (SO₂). The manufacture of sulphur trioxide is a reversible reaction and its enthalpy change is exothermic. ...

Why is so3 not added directly to water?

The correct answer of this question is option 'c', sulphur trioxide is not directly dissolved in water to form sulphuric acid because it results in the formation of dense fog of sulphuric acid which is difficult to condense.

Who discovered the contact process?

The fundamental features of the contact process, as we now know it, were first described by Peregrine Phillips, a vinegar manufacturer of Bristol, in his patent of 1831, and to him belongs the credit of making the original scientific discovery and of realising its commercial possibilities.

Why Platinum is not used in contact process?

The Contact Process is the current method of producing sulfuric acid in high concentrations needed for industrial processes. Platinum used to be the catalyst for this reaction; however, as it is susceptible to reacting with arsenic impurities in the sulfur feedstock, Vanadium Oxide (V₂O₅) is now preferred.