High-temperature carbonized coal tar serves as a primary source for_________?
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Answer: A. Aromatic compounds
Explanation
High-temperature carbonization breaks down complex coal structures into stable aromatic ring systems, making the tar rich in aromatics. Severe thermal cracking destroys aliphatic chains and promotes the formation of stable benzene-ring compounds. Coal tar recovered from high-temperature ovens serves as the primary industrial reservoir for aromatic chemicals. High-temperature carbonization heats coal up to one thousand degrees Celsius in the absence of air. Aromatic compounds contain one or more benzene rings characterized by exceptional chemical stability. Fractional distillation of coal tar separates valuable aromatic constituents like benzene, toluene, and naphthalene.
The chemical industry relies heavily on coal tar derivatives to manufacture plastics, dyes, and pharmaceuticals. Integrated steel mills recover and refine aromatic byproducts to add economic value to coking operations. Understanding tar chemistry helps engineers control carbonization temperatures and optimize product yields. Option B is incorrect because high temperatures destroy aliphatic compounds rather than producing them. Option C represents straight-chain saturated hydrocarbons that do not dominate high-temperature coal tars. Option D refers to unsaturated hydrocarbon alkenes which are less abundant in high-temperature tar fractions.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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