-
Fermentation
- warm in water bath 20-30C
yeast enzyme works best
-
Reaction
- sugar --(yeast)--> ethanol + carbon dioxide
- C6H12O6 (s) --(yeast)--> 2C2H5OH (l) + CO2
- ENZYMIC REACTION
- batch process
-
sugar source
-
grapes
- wine
-
barley
- beer
-
fractional distilation
- pure alcohol
- alcohol vapour condenses back to liquid
- ethanol + water + yeast in flask
- fractionating column containing glass beads
- thermometer
- condenser
- water in / out
- ethanol produced
-
renewable sources
- sources flavour the drinks
-
batch process
- small amount produced
- clean after each batch
-
from alkenes
-
continuous process
- fast rate of production
- large amounts produced
- non-renewable sources
- add flavourings to make drinks
-
conditions
-
high cost
- 300C
- 70 atm
-
other reactions
- ethanol to other important compounds
- use of -OH functional group
-
sodium
- sodium + ethanol ---> sodium ethanoate + hydrogen
- 2Na(s) 2C2H5OH (l) ---> 2C2H5ONa (s) + H2 (g)
-
oxidised
-
ethanoic acid
- a carboxylic acid
-
vinegar
- effects if wine & beer not sealed properly
-
oxidising agent
- potassium dichromate (VI) solution in sulphuric acid
-
dehydration
- ethene
-
conditions
-
excess of sulphuric acid
- (concentrated phosphoric (V) acid
H3PO4 can be used instead
- catalyst
- not written in reaction equation
- 170 C
-
Carboxylic acids
-
homologous series
-
functional group
- -COOH
-
methanoic acid
- HCOOH
-
ethanoic acid
- CH3COOH
-
propanoic acid
- C2H5COOH
-
ESTERS
- alcohols + concentrated sulphuric acid catalyst
- propanoic acid + ethanol <---> ethyl propanoate
-
ESTERFICATION REACTION
- absorbs the water formed in the reaction
-
sulphuric acid
- dehydrating agent
-
pleasant smells
- perfumes
-
methyl butanoate
- pineapple smell