||Stable. Combustible. Incompatible with strong oxidizing agents, strong acids, reducing agents, steam. Air, light and moisture-sensitive.
||Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
|Appearance & Physical State
||3.7 (vs air)
||4 mm Hg ( 45 °C)
Chinese name: benzaldehyde
English synonyms: benzaldehyde; Benzene, formaldehyde, benzene formaldehyde; Artificial bitter almond oil; Benzaldehyde; Benzaldehyde; Natural benzaldehyde; Benzene and methyl aldehyde; Benzyl aldehyde
English name: Benzaldehyde
English synonyms: Almond, artificial essential oil; Almondartificialessentialoil; Artifical essential oil of almond. Artificial Almond Oil. Artificial bitter almond oil. Artificialalmondoil; Benzaldehyde FFC; benzaldehydeffc
CAS no. : 100-52-7
Molecular formula: C7H6O
Molecular weight: 106.12
EINECS no. : 202-860-4
Nature of benzaldehyde
Melting point - 26 ° C
The boiling point of 179 ° c.
The density of 1.05
Vapor density (3.7 vs air)
Vapor pressure 4 mm Hg (45 ° C)
Refractive index n20 / D 1.545 (lit.)
Flash point to 145 ° f.
Freezing point - 56 ℃
Benzaldehyde use and synthesis method
Overview of benzaldehyde, also known as benzaldehyde, hydrogen of benzene was replaced by the aldehyde group after the formation of organic compounds Benzaldehyde is the simplest and most often for use in industry aromatic aldehyde. As a colorless liquid at room temperature, with special almond scent. Benzaldehyde is directly connected to phenyl aldehyde group and generated compounds, because of the similar bitter almond aroma and bitter almond oil has said. Benzaldehyde exist widely in plant kingdom, especially in rosaceae plants, mainly in the form of glycosides in plant stem bark, leaves or seeds, such as laetrile of bitter almonds, cherries, bay leaf, peach pit. Benzaldehyde naturally in bitter almond oil, oil of herba agastachis, hyacinth oil, ylang ylang oil, essential oil etc. The compounds are also combined in nuts and nut and glycosidic (bitter apricot glycosides, Amygdalin) in the form of existence. Chemical properties of benzaldehyde like fatty aldehyde, but there are also different. Benzaldehyde can\'t restore fehling reagent; With reduction of fatty aldehyde reagents used in the reduction of benzene, formaldehyde, in addition to the main products of benzyl alcohol, also produce some four instead of neighbouring diol compounds and diphenyl ethylene glycol. In the presence of cyanide, two molecules of benzaldehyde by giving generate benzoin hydrogen atoms. Benzaldehyde can also be of aromatic electrophilic substitution reaction on nuclear, mainly generated between a substitution product, such as main product for nitrobenzene formaldehyde between nitrification. Today\'s benzaldehyde is mainly composed of toluene preparation through different channels
Use benzaldehyde is medicine, dyes, spices, and the important raw material for resin industry, also can be used as a solvent, plasticizer and lubricant in low temperature, etc. In the essence industry is mainly used for the deployment of flavor, a small amount of used in daily chemical essence and cigarette flavor. Although is widely used as commercial food seasoning and industrial solvent, benzyl alcohol is still the main purpose of from pharmaceuticals to plastic additives used for synthesis of a variety of other compounds. Benzyl alcohol production of perfume, perfume and synthesis of some important intermediate of aniline dyes.
The synthesis of mandelic acid with benzaldehyde as initial reagents: prussic acid and benzaldehyde first reaction, product mandelonitrile hydrolysis then get racemic mandelic acid. Glaciologist LaChepelle and Stillman in 1966 reported benzaldehyde and heptyl aldehyde inhibit ice crystal, preventing thick cream (the Depth Hoar) formation. This approach can prevent due to unstable layer of snow avalanches. But this compound destroy vegetation and water pollution, is not widely used for this purpose.
The preparation of benzaldehyde can be produced by a variety of ways. Industry is mainly composed of toluene in the catalyst (vanadium pentoxide, tungsten trioxide or molybdenum oxide) under the action of gas phase oxidation in air or oxygen; Or under the light will toluene chlorination of benzyl chloride, and then hydrolysis, oxidation; Can also be chloride into two chlorine methyl benzene and hydrolysis. Industry also have with benzene as raw material, under the action of a pressurized and aluminium trichloride reaction with carbon monoxide and hydrogen chloride production. The lab was prepared by catalytic reduction method of benzoyl chloride benzaldehyde. The preparation of the current main approaches for the oxidation of toluene chloride liquid or. To be washed out preparation methods including the incomplete oxidation of benzene methanol, benzoyl chloride alkali solution, and addition of benzene and carbon monoxide.
Chemical properties Colorless or light yellow, strong refractive index volatile oily liquid, with bitter almond flavour, burns has a fragrant smell. With ethanol, ethyl ether, volatile oil and volatile oil miscibility, slightly soluble in water.
Use of important chemical raw materials, used in making lauric aldehyde, lauric acid, benzene acetaldehyde and benzyl benzoate etc, also used as a spice
Use GB 2760-1996 rules for temporary permits the use of edible spices. It is mainly used for preparation of almond essence, cherries, peaches, nuts and other type, dosage is 40%. As fu scent of canned cherries, per kg for the amount of sugar water 3 ml.
Use pharmaceutical intermediates, dyes, spices. Used in the production of oxygen radicals between benzaldehyde, lauric acid, lauric aldehyde, malachite green, benzyl benzoate, benzyl fork aniline, benzylidene acetone, etc. To blending soap fragrance, edible essence, etc.
use Can be used as the head of the special aroma, trace for floral formula, such as lilacs, Hester prynne, jasmine, violet, acacia, sunflower, sweet bean flower, plum, orange flower, etc. Can also use the soap. Can also be used as edible spices in almond, berries, cream, a cherry, coconut, apricots, peaches, big walnut, plum, incense was, spicy flavor. Liquor flavor type such as rum and brandy in also.
use Benzaldehyde wild yan withered, plant growth regulator is herbicides resistance to pour amine intermediates.