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Method for synthesizing benzyl acetate

A technology of benzyl acetate and a synthetic method is applied in the directions of reaction preparation of carboxylic acid/symmetric anhydride and saturated hydrocarbon, organic chemistry, etc., can solve problems such as low yield, environmental pollution, skyrocketing price of precious metal palladium, etc., and achieves a simple synthetic route, No effect of environmental pollution

Inactive Publication Date: 2003-08-27
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This process not only has a low yield, but also has serious corrosion to the reaction equipment. The by-products include hydrochloric acid, benzyl dichloride, and benzyl trichloride. The reaction process is long, the cost is high, and the environment is seriously polluted.
It has been reported in the literature that benzyl acetate is synthesized as a catalyst with metal palladium and organotin, but the price of precious metal palladium has skyrocketed and is not suitable for industrial applications

Method used

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Examples

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Embodiment Construction

[0008] The best embodiment of the present invention is described in detail below

[0009] 1. Catalytic oxidation reaction of toluene: add 20 grams of toluene, 40 grams of acetic acid, and 0.2 grams of catalyst into the autoclave, pass industrial oxygen into it, close the valve and start to heat up, and start to absorb when the temperature rises to 60°C For oxygen, the rate of reaction is controlled by adjusting the rate of oxygen absorption. The inner coil cooling method can also be used to control the reaction rate. Sampling and analysis during the reaction process to determine the end point. After 2 hours of reaction, the end point was reached. The reaction mixture was placed in a distillation vessel and distilled to obtain 26.1 g of benzyl acetate. The yield was 80% and the recovery rate of acetic acid was 90%.

[0010] Experiment number

[0011] 2. Distillation process: The post-treatment of the reaction product can be divided into two types. The reaction solution is...

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Abstract

The invention is a new method of synthesizing benzyl acetate. Its character: adopting methylbenzene as raw material, acetic acid as solvent and cobalt complex as catalyzer and using molecular oxygen to directly oxidize the methylbenzene to synthesize it.

Description

Technical field [0001] The invention belongs to the technical field of fine chemicals, and relates to a new method for synthesizing benzyl acetate (Benzyl acetate). Background technique [0002] Benzyl acetate has the aroma of jasmine and fruit, with a sweet smell. Used in soaps and other industrial flavors, it can enhance floral and fantasy fragrance, so it is often used in large quantities in flavors such as jasmine, white orchid, moonflower and narcissus. It can also be used in small amounts in raw pears, apples, and bananas. , Mulberry seeds and other food flavors. The previous production process route was to add dry toluene without iron to an iron-free reactor, perform high-temperature chlorination under light, and then fractionate the chlorinated product to obtain benzyl chloride, which is under alkaline conditions. It is hydrolyzed into benzyl alcohol, which is esterified with acetic acid to synthesize benzyl acetate. The by-product hydrogen chloride is absorbed into salt ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/035C07C69/157
Inventor 阎圣刚张天坤田宏哲姚卫东朱志军杨凤林
Owner DALIAN UNIV OF TECH
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