Explain lead chamber process, Chemistry

Assignment Help:

Q. Explain Lead chamber process?

Lead chamber process, is the older of the two processes. In this process SO2, is produced by burning S or roasting pyrites.

 S + O2------------------> SO2

4FeS2+ 11O2----------> 2Fe2O3+ 8SO2

The oxidation of SO2, to SO3, is carried out by  using oxides of nitrogen. These are produced by oxidation of NH, using platinum as catalyst.

4NH3+ 5O2--------------------> 4NO+ 6H2O

2NO+ O2--------------------> 2NO2

A mixture of air, SO2, and the nitrogen oxides is passed into a set of chambers lined with lead sheets from the top of which water is sprayed. The exact nature of the reactions which take place in the lead chambers is not fully understood. The following scheme of reactions seems to be operative:

NO2+ NO +2SO2+ H2O + O2----------------> 2(NO.HSO4)

2(NO. HSO4) +H2O-------------------------> 2H2SO4+NO2+ NO

Nitrosyl hydrogen sulphate formed as an intermediate reacts with H2, O to give H2S04, and the nitrogen oxides. The oxides play the role of a catalyst.

Though chamber process involves relatively simple steps, yet it is not the method of choice where high purity of the acid is required. The chamber acid contains As, O, (from pyrites), PbSO4, (from chamber) and some oxides of nitrogen as impurities. This acid finds use in the preparation of fertilisers where removal of impurities is not necessary. The second drawback with chamber method is that it gives dilute acid (60-78%).

Related Discussions:- Explain lead chamber process

Method for detection of elements - oxygen, Method for Detection of Elements...

Method for Detection of Elements - Oxygen There is no any type of satisfactory qualitative method for the detection of oxygen. Though, its presence can be inferred indirectly.

Crystals, what is a crystal and why do crystals have regular faces?

what is a crystal and why do crystals have regular faces?

Explain about stereoisomerism, Q. Explain about Stereoisomerism? Stereo...

Q. Explain about Stereoisomerism? Stereoisomers have the same bonds but the arrangement of atoms in space is different.  Stereoisomerism can be divided into two kinds: geometri

Uses of starch - biomolecules, Uses of Starch - Biomolecules (a) Starch...

Uses of Starch - Biomolecules (a) Starch are used as the most useful constituent of food as rice, bread, potato and corn-flour, etc. (b) Starch are used in the creation of d

Borosilicate glass, Borosilicate glass: in this boric anhydride is used in...

Borosilicate glass: in this boric anhydride is used in place of lime. This glass generally contains 75-81% silica, 10-13.5% B 2 O 3 , 4.5-6% Na 2 O and 2-5% Al 2 O 3 . Sometimes Z

Freezing Point Depression, A solution is prepared with 3.85g of a non-ionic...

A solution is prepared with 3.85g of a non-ionic unknown compound in 100.0g cyclohexane. The solution had a freezing point of 4.18 degrees Celsius. What is the molar mass of the un

Minimum reflux ratio for the separation, Crude oil is separated into severa...

Crude oil is separated into several fractions, each of these fractions are composed of many undefined hydrocarbon components. For simplicity, the crude oil is assumed to be a mixtu

Explain about atomic radius, Q. Explain about Atomic Radius? The atomic...

Q. Explain about Atomic Radius? The atomic size decreases with increase in atomic number  along any period in the long form of the periodic table due to increase in effective n

Write Your Message!

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd