Consider the following substances: I. Ethanol II. Nitroglycerine III. Urea Coal gasification technology can be used in the production of how many of them?
Contents15
- AOnly one
- BOnly two
- CAll the three
- DNone
Show answer
Answer: (B) Only two
Coal gasification is a process where coal is converted into a mixture of gases called syngas (synthesis gas), which primarily contains carbon monoxide (CO) and hydrogen (H₂).
This syngas can then be used as a building block for various chemical products.
(I) Ethanol — YES.
Syngas (CO + H₂) can be converted into ethanol through catalytic processes (like Fischer-Tropsch synthesis or fermentation using special bacteria).
This is a well-established pathway. ✓
(II) Nitroglycerine — NO.
Nitroglycerine is made through nitration chemistry — specifically, by treating glycerol with a mixture of concentrated nitric acid and sulfuric acid.
This is a completely different chemical process that has nothing to do with coal gasification or syngas. ✗
(III) Urea — YES.
Syngas provides hydrogen, which can be combined with nitrogen (from air) to produce ammonia (NH₃) through the Haber process.
This ammonia is then reacted with CO₂ to produce urea — one of the most widely used fertilizers.
India's coal gasification-based fertilizer plants (like the Talcher plant in Odisha) use exactly this process. ✓
So coal gasification can help produce ethanol and urea, but NOT nitroglycerine.
Answer is (b) Only two.
Coal gasification converts coal into syngas (CO + H₂), which serves as the chemical building block for producing fertilizers like urea and fuels like ethanol.
India is expanding coal gasification for fertilizer production, with major plants like the Talcher facility in Odisha using this technology to reduce fertilizer import dependence.
The question tests understanding of which chemicals can actually be synthesized from syngas versus those requiring completely different chemical processes like nitration.
Coal Gasification Technology
Environment Coal gasification technology syngas
Coal Gasification: Process, Products & UPSC Applications
Coal gasification converts coal into syngas (CO + H₂) - a clean fuel and chemical feedstock
Syngas can produce ethanol (through catalytic processes) and urea (via ammonia synthesis)
Cannot produce nitroglycerine - which requires nitric acid chemistry, not syngas
India operates coal gasification plants like Talcher (Odisha) for fertilizer production
What is Coal Gasification
Coal gasification is a thermochemical process that converts solid coal into a gaseous mixture called syngas (synthesis gas). This process involves heating coal at high temperatures (800-1000°C) with controlled amounts of oxygen and steam, breaking down the coal structure to produce primarily carbon monoxide (CO) and hydrogen (H₂).
Coal Gasification Process
%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
s1["`**Coal Feedstock**
Coal is crushed and prepared for gasification`"]
s2["`**High Temperature Reaction**
Coal heated to 800-1000°C with controlled oxygen/steam`"]
s3["`**Syngas Production**
Coal breaks down into CO + H₂ + other gases`"]
s4["`**Gas Cleaning**
Remove impurities like sulfur, ash particles`"]
s5["`**End Products**
Clean syngas used for chemicals, fuels, or electricity`"]
s1 --> s2
s2 --> s3
s3 --> s4
s4 --> s5Syngas Applications in Chemical Production
Product | Syngas Pathway | Process Used | UPSC Relevance |
|---|---|---|---|
Ethanol | CO + H₂ → Ethanol | Fischer-Tropsch synthesis or bacterial fermentation | Biofuel alternative, energy security |
Urea | H₂ + N₂ → NH₃ → Urea | Haber process + urea synthesis | Fertilizer production, agricultural self-reliance |
Nitroglycerine | NOT possible | Requires nitric acid + glycerol | Explosive, pharmaceutical use |
India's Coal Gasification Initiative
Talcher Fertilizers Limited (Odisha) - India's largest coal gasification-based urea plant using indigenous coal
Mission PURVODAYA - Government plan to develop eastern coal-bearing states through coal gasification
Atmanirbhar Bharat - Coal gasification reduces import dependence for chemicals and fertilizers
Environmental benefit - Cleaner than direct coal burning, reduces particulate emissions
Trap: Assuming all industrial chemicals can be made from syngas - nitroglycerine requires nitric acid chemistry
Confusion: Coal gasification vs coal liquefaction - gasification produces gas, liquefaction produces liquid fuels
Memory aid: Syngas = Synthesis gas = CO + H₂ = building blocks for synthesis of other chemicals
Number trap: Question asks 'how many' - count carefully: ethanol ✓, urea ✓, nitroglycerine ✗ = 2 substances
Ethanol Production & Applications
Environment Ethanol
Ethanol: Production Methods & Energy Applications
Ethanol (C₂H₅OH) is a key biofuel and renewable energy source
Can be produced from biomass fermentation or syngas conversion (coal gasification)
India's Ethanol Blending Program targets 20% ethanol in petrol by 2025
Ethanol Production Methods
Method | Raw Material | Process | Sustainability |
|---|---|---|---|
Biomass Fermentation | Sugarcane, corn, agricultural waste | Yeast fermentation of sugars | High - renewable feedstock |
Coal Gasification | Coal → Syngas | Fischer-Tropsch catalytic conversion | Medium - fossil fuel based but cleaner |
Cellulosic Ethanol | Agricultural residues, wood | Enzyme breakdown + fermentation | Very high - waste utilization |
India's Ethanol Program
E20 target - 20% ethanol blending in petrol by 2025 (currently ~10%)
Sugar mills integration - Convert sugarcane molasses into ethanol for dual revenue
2G ethanol plants - Second-generation plants using agricultural waste (paddy straw, wheat straw)
Import substitution - Reduces crude oil imports, enhances energy security
Don't confuse: Ethanol (fuel alcohol) vs methanol (wood alcohol) - different chemical formulas
Production source: Ethanol can come from both biological (fermentation) and chemical (syngas) routes
UPSC loves: E10, E20 percentage targets and their timelines - 20% by 2025 is current target
Urea Production & Fertilizer Industry
Environment Urea
Urea Synthesis: From Syngas to Fertilizer
Urea (NH₂-CO-NH₂) is the most widely used nitrogen fertilizer globally
Made from ammonia (NH₃) which comes from hydrogen in syngas via Haber process
Coal gasification provides hydrogen for ammonia synthesis - key for fertilizer self-reliance
Coal to Urea Production Chain
%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
s1["`**Coal Gasification**
Coal → Syngas (CO + H₂)`"]
s2["`**Hydrogen Extraction**
H₂ separated from syngas`"]
s3["`**Haber Process**
H₂ + N₂ → NH₃ (ammonia) at high pressure/temperature`"]
s4["`**Urea Synthesis**
NH₃ + CO₂ → Urea + water`"]
s5["`**Fertilizer Production**
Urea granulation and packaging`"]
s1 --> s2
s2 --> s3
s3 --> s4
s4 --> s5India's Fertilizer Strategy
Talcher plant (Odisha) - Uses indigenous coal for urea production, reduces import dependence
Fertilizer subsidy - Government provides urea to farmers at subsidized rates (~₹266/50kg bag)
Nutrient Based Subsidy (NBS) - Policy framework for fertilizer pricing and distribution
Atmanirbhar goals - Coal-based urea production reduces dependence on imported natural gas
Key connection: Urea needs ammonia, ammonia needs hydrogen, hydrogen comes from syngas
Don't miss: Haber process is the bridge between syngas and fertilizers - very important for industrial chemistry
India angle: Coal gasification for fertilizers is part of energy security and agricultural self-reliance
Nitroglycerine Production & Applications
Science And Technology Nitroglycerine
Nitroglycerine: Chemistry & Applications
Nitroglycerine is made by nitrating glycerol with nitric acid + sulfuric acid
Cannot be produced from coal gasification - requires completely different chemistry
Used in explosives (dynamite) and medicine (heart medication)
Why Not From Syngas
Nitroglycerine (C₃H₅N₃O₉) is produced through nitration chemistry - a process where nitro groups (-NO₂) are added to an organic molecule. This requires concentrated nitric acid (HNO₃) and sulfuric acid (H₂SO₄) as catalysts. Coal gasification produces syngas (CO + H₂), which lacks the nitro groups and acidic conditions needed for nitroglycerine synthesis.
Nitroglycerine vs Syngas Products
Compound | Chemical Formula | Production Method | Key Requirement |
|---|---|---|---|
Nitroglycerine | C₃H₅N₃O₉ | Glycerol + HNO₃ + H₂SO₄ | Nitric acid chemistry |
Ethanol | C₂H₅OH | Syngas → Catalytic conversion | Carbon monoxide + hydrogen |
Urea | NH₂CONH₂ | Syngas → NH₃ → Urea | Hydrogen from syngas |
Applications of Nitroglycerine
Explosives - Main ingredient in dynamite, used in mining and construction
Medicine - Sublingual tablets for angina (heart pain) - causes blood vessel dilation
Industrial - Controlled explosions for controlled demolitions
Historical - Alfred Nobel's invention, led to establishment of Nobel Prizes
Major trap: Assuming coal gasification can produce all industrial chemicals - nitroglycerine is the exception
Chemistry confusion: Nitroglycerine needs nitration, not synthesis from simple molecules
UPSC trick: The question tests knowledge of chemical processes, not just end products