英文版化学实验报告

Preparation of ethyl acetate

First, the purpose of the experiment:

1、Learn from the general principles of organic synthetic

esters and methods

2、Master distillation, extraction, drying and other

experimental techniques and its application in a

specific experiment

Second, the experimental principle:

Main reaction：

CH3COOH+CH3CH2OH=CH3COOCH2CH3+H2O

Conditions:heating to 120 to 125 °C in concentrated

sulfuric acid catalyzed

Side effects：

浓H2SO4

CH3CH2OH--------->CH2=CH2+H2O

170度

浓H2SO4

CH3CH2OH--------->CH3CH2OCH2CH3+H2O

140度

Third, the instruments and reagents:

1、Instruments and materials:Round-bottomed flask,

Spherical condenser,Straight condenser，Distillation

head, a separatory funnel, measuring beakers, dropper,

conical flask, thermometer, electric

2、drugs:Glacial acetic acid (AR), absolute ethanol (AR),

concentrated sulfuric acid, saturated brine, a

saturated sodium carbonate solution, a saturated

calcium chloride solution, dried over anhydrous

magnesium sulfate, litmus

Fourth,Reactor：

Fifth,Experimental procedure:

Adding 50ml round bottom flask 3ml 5ml ethanol and acetic acid, in shaking batch of concentrated sulfuric acid was added 1.3ml mixed, and add a few grains of zeolite, and then install the instrument response

Low heat, slowly reflux for 30 minutes. Coolish, reflux device to the distillation apparatus, wetted with cold water to cool the bottle. Heating distillation until the distillate liquid volume is about half the volume of the reaction so far to give the crude product in ethyl acetate

The distillate was slowly saturated sodium carbonate solution was added portionwise, and oscillate until the evolution of carbon dioxide gas without using litmus paper test acetate layer was neutral.The mixture was then transferred to a separatory funnel, and separated aqueous layer was washed once with saturated aqueous saline solution 3ml The organic layer was washed with a saturated solution of calcium chloride 3ml, washed with water and finally once.The organic layer in a dry Erlenmeyer flask filled with anhydrous magnesium sulfate. The crude ethyl acetate, dried on a water bath heated to distill, collecting fractions 73 to 78°C.Weigh or measure product volume, and calculate the yield point or refractive index measurement products

Six, Discuss:

1、Able to use in place of a concentrated sodium hydroxide solution

was washed with a saturated solution of sodium carbonate

distillate?

Can not. Because a strong base is sodium hydroxide, the product causes the hydrolysis of ethyl acetate, thereby reducing the yield of