Correct Option
Coal gasification is a process that converts coal into synthesis gas (syngas), which is primarily a mixture of carbon monoxide (CO) and hydrogen (H₂). Syngas is a versatile intermediate that can be used as both a fuel and a chemical feedstock for producing various downstream products.
- Ethanol: Syngas can be converted into ethanol through chemical synthesis (e.g., using catalysts) or biological fermentation processes involving specialized microorganisms. This technology is established for producing fuel-grade ethanol.
- Urea: Urea is synthesized from ammonia and carbon dioxide. Hydrogen (H₂) derived from syngas can be reacted with nitrogen (N₂) from air separation to produce ammonia (NH₃) via the Haber-Bosch process. Carbon dioxide (CO₂) can also be sourced from the gasification process itself or other industrial sources. The Talcher Fertilizer plant in India is an example of a coal gasification-based urea production facility.
Therefore, two of the listed substances, Ethanol and Urea, can be produced using coal gasification technology.
Incorrect Options
- Nitroglycerine: Nitroglycerine is an organic nitrate compound produced by the nitration of glycerol with a mixture of concentrated nitric acid and sulfuric acid. Its synthesis pathway does not involve syngas or coal gasification as a direct feedstock.
- Options (A) Only one, (C) All the three, and (D) None: These options are incorrect because coal gasification technology can be utilized for the production of two of the three listed substances (Ethanol and Urea), but not Nitroglycerine.