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Synthetic process for p-methoxybenzaldehyde

A technology for p-methoxybenzaldehyde and p-hydroxybenzaldehyde, which is applied in the field of synthesis technology of p-methoxybenzaldehyde, can solve the problems of being unsuitable for large-scale production, complex production process, low production efficiency, etc. Conversion rate and product yield, overcoming the effect of many processes and improving work efficiency

Inactive Publication Date: 2016-06-08
QINGDAO SHOUTAI AGRI SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current process for preparing p-methoxybenzaldehyde, the technical process is not easy to implement, and the resulting p-methoxybenzaldehyde product has low purity, low single-pass conversion rate of reactants, complex production process, low production efficiency and high cost. High, not suitable for mass production

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0012] The synthetic technique of the p-methoxybenzaldehyde of the present embodiment, comprises the following steps:

[0013] (1) Use p-hydroxybenzaldehyde as raw material, methyl chloride gas as raw material, water as solvent, and carry out methylation reaction according to a certain feeding ratio;

[0014] (2) Use alkaline substances to control the pH of the reaction system at 13.5, the methylation reaction pressure is 0.5MPa, the reaction temperature is 110°C, and the reaction time is 8 hours. Direct gas-liquid phase reaction to obtain crude p-methoxybenzaldehyde (organic layer) ;

[0015] (3) Separate the organic layer and the water layer, extract the water layer twice with aromatic hydrocarbons (such as toluene), combine the organic layers, and wash the organic layer to pH6.5;

[0016] (4) Atmospheric distillation to recover the solvent, and then vacuum distillation to collect the fraction at 93°C / 600Pa, which is the product p-methoxybenzaldehyde.

[0017] The synthesi...

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PUM

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Abstract

The invention discloses a synthetic process for p-methoxybenzaldehyde. The synthetic process comprises methylation reaction with p-hydroxybenzaldehyde as a raw material, methyl chloride gas as a methylation raw material and water as a solvent according to a certain feeding proportion. According to the invention, methyl chloride gas is used as the methylation raw material, so reaction is single; selectivity is up to 95%; yield of a target product reaches more than 90%; meanwhile, treatment of three wastes is simple, so the process belongs to clean and green chemical synthetic process.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a synthesis process of p-methoxybenzaldehyde. Background technique [0002] p-Methoxybenzaldehyde is a colorless to pale yellow liquid at room temperature with a hawthorn-like odor. Deploy the main spice of hawthorn flower fragrance. It can also be used in floral fragrances such as lilac, orchid, sunflower, acacia, mimosa, black locust, magnolia, rosin, and sweet bean flower, and non-flower fragrances such as new mow grass, vanilla, and aldehydes. It can also be used in heavy woody flavors such as sandalwood. Also used in soap essence. It is used for sweetness and flavor in food. In the current process method for preparing p-methoxybenzaldehyde, the technical process is not easy to implement, the resulting p-methoxybenzaldehyde product has low purity, low single-pass conversion rate of reactants, complex production process, low production efficiency a...

Claims

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Application Information

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IPC IPC(8): C07C45/61C07C47/575
Inventor 张晶
Owner QINGDAO SHOUTAI AGRI SCI & TECH CO LTD
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