PPE 4 QUART 1

Question 1

is one of the costliest steps in the production of bioethanol.
Different pretreatment methods aimed at increasing the reactivity of
cellulose and the potential yield of the fermentable sugars.

Answer 1

Pretreatment

Question 2

BIOETHANOL PRODUCTION
The processes involved in the production of bioethanol from different feedstocks
include

Answer 2

pretreatment, hydrolysis, fermentation and ethanol recovery.

Question 3

PRE-TREATMENT
this involves the breaking down of the size of the
lignocellulosic biomass and crystallinity by methods such as milling,
grinding, irradiation and extrusion.

Answer 3

Physical pretreatment

Question 4

PRE-TREATMENT
these include acid, alkali, oxidative
delignification, and organic acid (organosolvation) methods.

Answer 4

Chemical pretreatment:

Question 5

PRE-TREATMENT
This involves the use of microorganisms to
breakdown lignocellulosic biomass for further enzymatic hydrolysis.

Answer 5

Biological pretreatment:

Question 6

is basically a step of breaking down the
cellulose/hemicellulose through hydrolysis to make sugars such as glucose
and xylose.

Answer 6

Saccharification

Question 7

is a chemical reaction where a water molecule is
used to break a bond in another molecule.

Answer 7

Hydrolysis

Question 8

(C6H10O5)n (cellulose) + nH2O→nC6H12O6
(glucose)

Answer 8

(HYDROLYSIS)

Question 8

operates
under severe conditions of high temperature and low pH, which results in
corrosive conditions and requires a special construction material

Answer 8

Acid hydrolysis

Question 8

SACCHARIFICATION (HYDROLYSIS)
one because it has a
better environmental and economic performance.

Answer 8

enzymatic