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Preparation method of methyl paraben

A technology of methyl paraben and methanol, which is applied to the preparation of carboxylic acid esters, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of environmental pollution, sulfuric acid corrosion, and easy side reactions, etc., and achieve environmentally friendly Pollution, simple operation, low price effect

Inactive Publication Date: 2015-06-24
QINGDAO XIUXIAN FOODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis of methylparaben is usually directly prepared by p-hydroxybenzoic acid and methanol under the action of concentrated sulfuric acid, but sulfuric acid is highly corrosive, prone to side reactions and pollutes the environment

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0015] 1. In the autoclave, add methanol and p-hydroxybenzoic acid with a molar ratio of 35:1, hydrated aluminum sulfate, stir and heat to 130°C, and react for 3 hours;

[0016] 2. After the reaction is completed, add water, heat and steam to remove unreacted methanol, add sodium hydroxide solution dropwise to the remaining liquid, cool, precipitate solid, filter with suction, wash, and dry to obtain methyl paraben in white powder.

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PUM

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Abstract

The invention discloses a preparation method of methyl paraben. The preparation method comprises the following steps: 1) adding methanol and p-hydroxybenzoic acid in the molar ratio of 35: 1, as well as aluminum sulfate hydrate into a high-pressure reaction kettle, stirring and heating to 130 DEG C and reacting for 3h; and 2) adding water after the reaction, heating to evaporate out unreacted methanol, dropping a sodium hydroxide solution into remaining liquid, cooling, precipitating solids, performing suction filtration, washing and drying to obtain white powder-like methyl paraben. According to the preparation method of methyl paraben provided by the invention, aluminum sulfate hydrate is used as a catalyst, and aluminum sulfate hydrate has high catalytic activity, simple operation, no equipment corrosion, low price, no toxicity and no environmental pollution, thereby being a green catalyst.

Description

[0001] Technical field [0002] The invention relates to a preparation method of a preservative, in particular to a preparation method of methyl paraben. [0003] Background technique [0004] Paraben, also known as potassium paraben, is a series of preservatives with the widest use, the largest dosage, and the highest application frequency in the world. It has the advantages of high efficiency, low toxicity, spectrum, and easy compatibility. It is widely used in daily chemicals, medicine, food, feed and various industrial antiseptics. Among them, methyl paraben is a powerful fungicide. The synthesis of methyl paraben is usually directly prepared by p-hydroxybenzoic acid and methanol under the action of concentrated sulfuric acid, but sulfuric acid is severely corrosive, prone to side reactions and environmental pollution. [0005] Summary of the invention [0006] The purpose of the present invention is to provide a method for preparing methyl paraben, which uses aluminum sulfate h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/84C07C67/08
CPCC07C67/08C07C67/48
Inventor 郝永明
Owner QINGDAO XIUXIAN FOODS