What are the methods of benzyl alcohol preparation?
Release time:
2022/08/18
It is obtained by heating and hydrolyzing benzyl chloride under the catalysis of alkali. Specifications of spice grade benzyl alcohol (QB792-81): relative density 1.041-1.046, refractive index 1.538-1.541, boiling range 203-206°C distillate over 95%, solubility completely soluble in 30 times the volume of distilled water, containing Alcohol content ≥ 98%, chlorine test (NF) is a side reaction. Raw material consumption quota: benzyl chloride 1600kg/t; soda ash 1000kg/t.
Benzyl chloride hydrolysis method
It is obtained by heating and hydrolyzing benzyl chloride under the catalysis of alkali. Specifications of spice grade benzyl alcohol (QB792-81): relative density 1.041-1.046, refractive index 1.538-1.541, boiling range 203-206°C distillate over 95%, solubility completely soluble in 30 times the volume of distilled water, containing Alcohol content ≥ 98%, chlorine test (NF) is a side reaction. Raw material consumption quota: benzyl chloride 1600kg/t; soda ash 1000kg/t.
Toluene Oxidation
Under the action of a basic catalyst, toluene is oxidized to produce benzyl alcohol. Considering that benzyl alcohol is difficult to separate from the reaction product acetic acid, benzyl acetate and water, under the action of a specific catalyst iodide styrene-divinylbenzene , cyclic reaction; and benzyl acetate and methanol can also be subjected to transesterification, and through separation and purification, high-purity benzyl alcohol can be obtained.
Synthesis of Benzyl Alcohol from Benzene and Formaldehyde
Using β-cyclodextrin as the parent, first react with maleic anhydride to synthesize bis(6-oxo-butenedioic acid monoester) β-cyclodextrin (abbreviated as E1), and then modify E1 with chloroacetic acid to obtain bis[ 6-Oxy-(3-deoxycitrate monoester)] β-cyclodextrin (abbreviated as E2), and then use E1 or E2 as a catalyst to catalyze the reaction of benzene and formaldehyde to generate benzyl alcohol[7].
Preparation of Benzyl Alcohol by Hydrolysis of Benzyl Ester
Using benzyl formate, benzyl propionate, benzyl acetate or benzyl benzoate as raw materials, carry out liquid phase hydrolysis at a temperature of 150-320°C to prepare benzyl alcohol. After hydrolysis, the reaction mixture is cooled to a temperature of 80-180°C, separated into layers, and the organic phase is separated to obtain benzyl alcohol with a purity greater than 98%, and a conversion rate greater than 98%.
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