Chemistry: Ethanol Properties and Uses
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Questions and Answers

What is the first step in the production of biogas, syngas, pure hydrogen, and alkaline gases?

  • Conversion of coal or biomass in a gasifier (correct)
  • Synthesis of acetaldehyde and ethylene
  • Hydration of sulfuric acid ester
  • Fermentation of agricultural products
  • What is a disadvantage of the indirect hydration method of ethanol synthesis?

  • It is a slow process
  • It requires a high-temperature furnace
  • It uses a expensive catalyst
  • It produces SO2 as a side product (correct)
  • What is the current target of ethanol blending in India?

  • 10% (correct)
  • 20%
  • 5%
  • 15%
  • What is the primary use of ethanol in the synthesis of esters?

    <p>As a reactant</p> Signup and view all the answers

    Which company first used the direct catalytic hydration method of ethanol synthesis in 1947?

    <p>Shell</p> Signup and view all the answers

    What is the primary purpose of using a submerged burner in the indirect hydration method of ethanol synthesis?

    <p>To evaporate water from dilute H2SO4</p> Signup and view all the answers

    What percentage of propylene is used by the petroleum refining industry?

    <p>50-70%</p> Signup and view all the answers

    What is the primary use of propylene oxide?

    <p>Polyurethane plastic and foam</p> Signup and view all the answers

    What is the percentage of ethylene used for the production of ethylene oxide?

    <p>13%</p> Signup and view all the answers

    What is the percentage of propylene used for the production of polypropylene?

    <p>47%</p> Signup and view all the answers

    What is the percentage of ethylene used for the production of polyethylene (LD)?

    <p>27%</p> Signup and view all the answers

    What is the traditional method of producing ethylene?

    <p>Partial hydrogenation of acetylene</p> Signup and view all the answers

    What is the conversion percentage of C2H4?

    <p>4%</p> Signup and view all the answers

    What is the primary source material used in industrial ethanol production?

    <p>Molasses</p> Signup and view all the answers

    What is the purpose of adding sulphuric acid in the ethanol production process?

    <p>To favour yeast growth and inhibit bacterial growth</p> Signup and view all the answers

    What is the percentage of fermentable sugar present in molasses?

    <p>60%</p> Signup and view all the answers

    What is the temperature at which yeast is added to the molasses solution?

    <p>35°C</p> Signup and view all the answers

    What is the percentage of purity of ethanol obtained after fermentation?

    <p>15% to 18%</p> Signup and view all the answers

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