This presentation is about a common laboratory solvent namely Ethyl acetate. This presentation describes its properties, manufacturing methods and commercial application in a brief manner. This will be useful pharmacy and other chemical related studies.

1. Ethyl Acetate
Submitted by,
Rajasekaran E
Final year- Bachelor of Technology,
Department of Pharmaceutical Technology,
University college of Engineering- BIT Campus,
Anna University,
Tiruchirappalli-24

2. Ethyl Acetate
• Ethyl acetate is a organic compound with the formula
CH3–COO–CH2–CH3, simplified to C4H8O2.
• Ethyl acetate is the ester of ethanol and acetic acid.
• This is a colourless liquid has a characteristic sweet
smell (similar to peer drops).
• They are manufactured in large quantities for use as a
solvent.
• They are also used in glues, nail polish removers, and in
decaffeinating tea /coffee.

3. For your knowledge
 Caffeine is a CNS stimulant of Methyl xanthine class present in tea
and coffee.
 Removal of caffeine from the tea leaves,coco,coffee bean,etc. Is
known as decaffeinating process.
 In this process the unroasted beans are soaked in the ethyl acetate and
washed.
 Decaffeinated drinks should contain 1- 2•/• of original caffeine.

4. Properties
• It is also called as ethyl ethanoate, Acetic ester, acetic ether.
• commonly abbreviated EtOAc, ETAC or EA.
• Lethal dose & concentration:.
 LD 50- 11.3 g/kg (in rat).
 LC 50- 16000 pm (in rat for 6 hed).
• General properties:
 Chemical formula - C4H8O2
 Malar mass- 88.106 g/mol
 Appearance- colourless
 Odour- fruity smell

5.  The LD50 for rats is 5620 mg/kg, indicating low toxicity,
though there is little risk of toxicity.
 Overexposure to ethyl acetate may cause irritation of the eyes,
nose, and throat.
 Severe overexposure may cause weakness, drowsiness, and
unconsciousness.
 Ethyl acetate is an irritant of the conjunctiva and mucous
membrane of the respiratory tract. Which causes temporary
opacity and eruption of skin.
 At higher concentrations (20,000 to 43,000 ppm (2.0–4.3%))
there may be pulmonary edema with hemorrhages, symptoms
of central nervous system depression, secondary anemia and
liver damage.

6.  Flammable (F),I.
 Irritant (Xi).
 Flash point - −4 °C (25 °F; 269 K).
 Explosive limits- 2.0–11.5%
Hazards properties

7. Manufacturing methods
of Ethyl acetate

8. Production techniques
Fisher esterification process.
Tishchenko reaction.
Dehydrogenation of ethanol.

9. Fischer esterification
This is a special type of esterification by refluxing a carboxylic acid
and an alcohol in presence of an acid catalyst.
Manufacture of ethylacetate is done by refluxing ethanol and acetic
acid.

11.  Maximum yield obtained from this reaction is 65
percent.
 Equilibrium can be shifted to right by removal of
water.
 One of the easiest technique for dedicated
production.
 Initially in all the chemical industry this technique
is used.

12. Tishchenko reaction
 Ethyl acetate can also be prepared by tishchenko
reaction. Which is similar to that of cannizaro
reaction.
 In Tishchenko reaction disproportion of an aldehyde
in the presence of an alkoxide happens to form a ester
product.
 Aluminium/sodium alkoxide as catalyst is used.

13.  This reaction is similar to that of the cannizaro reaction.
 Were parallel oxidation and reduction happens.
 Oxidation product is carboxylic acid.
 Reduction product is alcohol.
(When the reaction is continued to prolong it gives ester).

14. Dehydrogenation of
ethanol
• A specialized industrial route entails the catalytic
dehydrogenation of ethanol.
• This method is more cost effective than the
esterification.
• because this is applied with surplus ethanol in a chemical
plant.
• Typically, dehydrogenation is conducted with copper at
an elevated temperature but below 250 °C.

15. • The copper may have its surface area
increased by depositing it on zinc, zeolite,
typically ZSM-5.
• Which promotes growth of flakes.
• Traces of rare-earth and alkali metals are
beneficial to the process.

16.  Some of the possible side reactions

18. Byproducts of the dehydrogenation include
 diethyl ether, which is thought to arise primarily due to
aluminum sites in the catalyst,
 acetaldehyde and its aldol products, higher esters, and
ketones.
Hence separation of such kinds of mixtures are very tedious
process. Because,
 ethanol forms an azeotrope with water, as does ethyl
acetate with ethanol and water.
 azeotropes are broken by pressure swing distillation or
membrane distillation.

19. For your knowledge
 An azeotrope is a mixture of two or more liquids whose proportions
cannot be altered or changed by simple distillation.
 This happens because when an azeotrope is boiled, the vapour has
the same proportions of constituents as the unboiled mixture.
 Because their composition is unchanged by distillation, azeotropes
are also called constant boiling point mixtures.

20. Pressure swing distillation:
Pressure-swing distillation is a method for
separating a pressure-sensitive azeotrope that
utiltizes 2 columns operated in sequence at 2
different pressures.

21. Distillate D1 is sent to Column T-2 as feed F2 .
Nearly pure B is obtained from bottom of T-2, and
the distillate D2 is recycled to Column T-1

22. Membrane distillation
 Membrane distillation (MD) is a thermally driven separation process
in which separation is driven by phase change.
 A hydrophobic membrane presents a barrier for the liquid phase,
allowing the vapour phase (e.g. water vapour) to pass through the
membrane's pores.
 The driving force of the process is a partial vapour pressure
difference commonly triggered by a temperature difference.

24. Uses of ethyl acetate
 Ethyl acetate is used primarily as a solvent and diluent,
being favored because of its low cost, low toxicity, and
agreeable odor.
 it is commonly used to clean circuit boards and in some
nail varnish removers.
 Coffee beans and tea leaves are decaffeinated with this
solvent.
 Ethyl acetate is present in confectionery, perfumes, and
fruits.
 In perfumes, it evaporates quickly, leaving only the scent
of the perfume on the skin.

25.  Ethyl acetate is the most common ester in wine, being generated
during the fermentation.
 The aroma of ethyl acetate is most vivid in younger wines.
 Excessive amounts of ethyl acetate are considered a wine fault.
 In the field of entomology, ethyl acetate is an effective asphyxiant
for use in insect collecting and study

26. Laboratory uses
 In the laboratory, mixtures containing ethyl acetate are
commonly used in column chromatography and extractions.
 Ethyl acetate is rarely selected as a reaction solvent because
it is prone to hydrolysis and transesterification.
 Ethyl acetate is fairly volatile at room temperature and has a
boiling point of 77 °C (171 °F).Hence, it can be removed
from a sample by heating in a hot water bath and providing
ventilation with compressed air.

27. Thank you
for
your patience.
~நன்றி
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