The production principle and technological process of cinnamaldehyde

Cinnamaldehyde is also called cinnamic aldehyde and β-phenyl acrolein.
Its molecular formula is C ₉ H ₈ O, its molecular weight is 132.
15, and its structural formula is

1.

Light yellow oily liquid; flammable and non-toxic; freezing point -7.
5°C, boiling point 252°C (partially decomposed), 127°C (16×133.
3Pa), relative density (d ₄ ²⁰ ) 1.
0497, refractive index 1.
6195, flash point 71℃; soluble in alcohol, ether, chloroform , slightly soluble in water; has a special aromatic odor of cinnamon, which can volatilize with water vapor; easily oxidized to cinnamic acid in the air
.

2.
Production principle

Under alkaline conditions, benzaldehyde and acetaldehyde undergo an aldol condensation reaction, and the mixture is distilled under reduced pressure to obtain cinnamaldehyde
.

3.

4.

5.

Condensation reaction tank, storage tank, vacuum distillation kettle
.

6.
Production process

Add 266kg of benzaldehyde and 800kg of water into the condensation reaction tank, and add 20kg of 40%-50% sodium hydroxide and 135kg of acetaldehyde at 20°C
.

7.
Laboratory preparation method

600mL of 1% NaOH aqueous solution, 100mL of ethanol, 25g of benzaldehyde and 25g of acetaldehyde were added to the reaction flask, and the reaction was stirred at room temperature for 4 to 5 hours.
Then 500g of common salt was added to the reaction mass and extracted 3 times with 240mL of ether
.

Related links: Product performance and production principle of p-chlorobenzaldehyde