Question

describe the industrial method of ethyl preparation of alcohol from starch.Give chemical equation of reaction also

Answer 1

STEPS OF PREPARATION

EXTRACTION OF STARCH The crushed potato is steamed at 140OC to 150OC under pressure to prepare starch solution known as MASH.
GERMINATION Before hydrolysis, starch is first undergo germination at 10OC to 13OC for few days. This germinated starch is called MALT.
HYDROLYSIS OF STARCH Satrch is hydrolysed to maltose by an enzyme known as diastase.

2(C6H10O5) + nH2O ----> n(C12H22O11)
Starch Maltose 

FERMENTATION Finally yeast is added to maltose. 

Yeast secrets two enzymes:

1. Maltase: converts maltose into glucose.
2. Zymase: converts glucose into ethanol..
C12H22O11 + H2O -->  2C6H12O6

C6H12O6 ---->  C2H5OH + 2CO2

Answer 2

Answer:

EXTRACTION OF STARCH The crushed potato is steamed at 140OC to 150OC under pressure to prepare starch solution known as MASH.

GERMINATION Before hydrolysis, starch is first undergo germination at 10OC to 13OC for few days. This germinated starch is called MALT.

HYDROLYSIS OF STARCH Satrch is hydrolysed to maltose by an enzyme known as diastase.

2(C6H10O5) + nH2O ----> n(C12H22O11)

Starch Maltose

FERMENTATION Finally yeast is added to maltose.

Yeast secrets two enzymes:

1. Maltase: converts maltose into glucose.

2. Zymase: converts glucose into ethanol..

C12H22O11 + H2O -->  2C6H12O6

C6H12O6 ---->  C2H5OH + 2CO2

Explanation: