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Benzylideneacetone is also known as benzalacetone, 4-phenyl-3-buten-2-one (4-phenyl-3-buten-2-one), and its molecular formula is C 10 H 10 O, molecular weight is 146.
19, structural formula is
1.
Product performance
White or light yellow crystal; melting point 41.
5℃, boiling point 261~262℃, 161℃(40×133.
3Pa), 126~128℃(9×133.
3Pa), relative density (d 15 15 ) 1.
0377, refractive index (n D 45.
9 ) 1.
5836; Slightly soluble in water, soluble in sulfuric acid , benzene, ethanol , and chloroform ; smells of coumarin, darkening when exposed to light; easy to decompose when heated for a long time
.
2.
Production principle
Under alkaline conditions, benzaldehyde and acetone undergo aldol condensation to obtain the product
.
3.
Process flow
4.
Technical formula (kg/t)
5.
Main equipment
Vacuum distillation tower, condensation reactor, fractionation tower, suction filter, crystallization pot, drying box
.
6.
Production process
The raw material benzaldehyde is distilled under reduced pressure
.
Then 84 parts of benzaldehyde, 127 parts of acetone and 80 parts of water were added to the condensation reaction kettle, cooled to 25°C, and 24 parts of 10% sodium hydroxide were slowly added
.
If it is refined by vacuum distillation, collect the fractions with a boiling range of 137~142℃/16×133.
3Pa, cool and crystallize, and get the finished product
.
7.
Laboratory preparation method
Put 42g of benzaldehyde, 63.
5g of acetone and 40mL of distilled water into the reaction flask, then add 12g of 10% sodium hydroxide solution, and the temperature is controlled at 25~31℃
.
After adding, continue to stir for 1h
.
8.
Product Standard
9.
Product use
Organic synthesis intermediate; can be used as anti-volatile agent of perfume; used as mordant and fixing agent in dyeing industry; used to prepare perfume or flavor enhancer, and prepare brightening agent for nickel plating and zinc plating
.
10.
Security measures
(1) This product is toxic and can irritate the skin and mucous membranes
.
The production equipment should be airtight, and the operator should wear protective gear to avoid contact with the skin
.
(2) Packed in iron drum lined with plastic bag
.
It is flammable and should be kept away from light
.