Lecture 8

Question 1

The making of ethanol from starch-laden products (e.g., wheat or corn)

Answer 1

• Step1–Raw material starch (from wheat or corn kernels) are ground in a hammer mill.
• Step2–Convert starch to sugar using acids.
• Step3–Yeast is added to ferment the sugars to ethanol.
• Step4–The ethanol is separated from the mixture by distillation.

Question 2

Cellulosic Ethanol

Answer 2

Made from a wide array of plant residues and other plant biomass.

Question 3

Biodiesel

Answer 3

Can be made from oil seed, waste vegetable oil, animal fats or algae.

Question 4

Transesterification

Answer 4

Production of liquid biofuels requires inputs of fossil fuels and also impacts land and water use.

Question 5

Cellulose crops

Answer 5

By-products such as a straw, or wood can be used as solid fuel crops in ethanol production.

Question 6

Strarch and sugar crops

Answer 6

Potato, sugar beet, sugar cane, etc…

Question 7

Cereals

Answer 7

Barley, Oats, Maize (corn), ad rye.

The grain can b fused to produce bio-alcohols and the straw can be used as a solid fuel.