Chemistry Coal & Petroleum Part 7 (Destructive distillation of Coal) Class 8 VIII | Summary and Q&A

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November 4, 2015
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Chemistry Coal & Petroleum Part 7 (Destructive distillation of Coal) Class 8 VIII

TL;DR

Destructive distillation of coal involves heating coal to high temperatures in the absence of air, resulting in the formation of coal tar, coal gas, liquid ammonia, and coke.

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Questions & Answers

Q: What is destructive distillation of coal?

Destructive distillation of coal is a process where coal is heated to high temperatures in the absence of air, resulting in the formation of useful products such as coal tar, coal gas, liquid ammonia, and coke.

Q: What are the uses of coal tar?

Coal tar is a black viscous liquid that is useful in the manufacturing of products like perfumes, plastics, paints, medicines, and roofing materials.

Q: How is liquid ammonia obtained from coal?

Liquid ammonia is obtained as a colorless layer above coal tar during the destructive distillation of coal. It contains a lot of dissolved ammonia and acts as an excellent fertilizer for better plant growth.

Q: What is coke and how is it used?

Coke is a porous black substance that is left over after the destructive distillation of coal. It is a pure form of carbon and is used as a reducing agent in the manufacturing of steel. It is also used as a cleaner and more efficient fuel in stoves and furnaces.

Summary & Key Takeaways

  • Destructive distillation of coal is a process that involves heating coal to over 1,000 degrees Celsius in the absence of air.

  • The process yields four useful products: coal tar, coal gas, liquid ammonia, and coke.

  • Coal tar is a black viscous liquid used in the manufacturing of products such as perfumes, plastics, paints, medicines, and roofing materials.

  • Liquid ammonia acts as an excellent fertilizer for plant growth.

  • Coal gas is a flammable fuel primarily used for heating purposes.

  • Coke, a porous black residue, is a clean fuel alternative to coal and is used in the manufacturing of steel.

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