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A production process for preparing anethole by catalyzing the dehydration of p-methoxyphenylpropanol

A technology of methoxyphenylpropanol and p-methoxybenzene, which is applied in the production process field of catalyzing the dehydration of p-methoxyphenylpropanol to prepare anethole, can solve the problems of complex post-processing, environmental pollution, etc., and achieve industrialization production, reduce the amount of three wastes, and reduce the effect of polymerization impurities

Active Publication Date: 2021-07-09
SUQIAN COSMOS CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are soluble salts as catalysts in the dehydration process, a large amount of organic solvents participate in the reaction, the post-treatment is complicated, and there is a possibility of environmental pollution

Method used

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  • A production process for preparing anethole by catalyzing the dehydration of p-methoxyphenylpropanol
  • A production process for preparing anethole by catalyzing the dehydration of p-methoxyphenylpropanol
  • A production process for preparing anethole by catalyzing the dehydration of p-methoxyphenylpropanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] 3 g of acidic alumina and 100 g of methoxyphenol were put into four flasks, and then the reaction liquid was warmed to 120 ° C, and the water separator was separated until anhydrous fraction stopped.

[0086] The reaction liquid Gc detection content, the cis is 6.3%, and the inverse fennel has a fluid content of 91.6%, the polymer content is 1.3%, and the selectivity of the fennel reaches 97.9%. The gas chromatogram of after separation of transfennel figure 1 Indicated. The product structure was analyzed by 1H-NMR analysis. Features: benzene ring resonance peaks (7.1-7.6 ppm, 4h); double bonds with a hydrogen resonance peak (6.5 ppm, 1h) of the benzene ring, double bonds with methyl Hydrogen resonance peak (6.1 ppm, 1H); methoxy carbon upper hydrogen resonance peak (3.8 ppm, 3h), and hydrogen resonance peaks (2.1 ppm, 3h) of the double-bonded methyl group.

Embodiment 2

[0088] 3 g of aluminum hydroxide and 100 g of methoxyphenol were put into four flasks, and then the reaction liquid was warmed to 120 ° C, and the water separator was separated until anhydrous fraction stopped.

[0089] The reaction liquid Gc was detected, the cis is 6.5%, and the inverse fennel has a fluid content of 90.3%, the polymer content is 2.3%, and the selectivity of the fennel has reached 96.8%.

Embodiment 3

[0091] The reaction conditions were the same as in Example 1, and the difference is only that the reaction temperature is 100 ° C.

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PUM

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Abstract

The invention discloses a production process for preparing anethole by catalyzing the dehydration of p-methoxyphenylpropanol. Dehydration of methoxyphenylpropanol produces anethole. In the production process of the present invention, no waste gas is generated in the reaction process, the reaction rate is fast, the yield is high, the polymerization impurities of anethole are few, and it has high economic value, and the reaction does not require post-processing and solvent participation, and has low requirements for equipment. Easy to industrialize.

Description

Technical field [0001] The present invention relates to the field of fine chemicals, and more particularly to a production process for catalytic formation of fennel copremethyl methacol dehydration. Background technique [0002] Anethole, also known as the big plenifia, anise brain, isothatichertis brain, propylene-based ethisher, etc., chemical name is 1-methoxy-4- (1-propenyl)-benzene, etc. , Inverted isomers (cis, trans-fennel copies of CAS number 104-46-1, trans-fennel CAS number of 4180-23-8). The chemical structural formula of the fennel is as follows: [0003] [0004] Whether it is a natural product or a synthetic product, the fennel is present in the form of invertion, the conclusion mixture, but the former is mainly. The transfennel is confirmed by the US Food and Drug Administration (FDA) and the US Spices and Extractive Manufacturer Association (FEMA). "GRAS). The transfennel is naturally present in more than 20 kinds of food. According to a large amount of data, ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/215C07C41/18C07C45/46C07C49/84C07C41/26C07C43/23B01J29/40
CPCB01J29/40C07B2200/09C07C41/18C07C41/26C07C45/46C07C49/84C07C43/23C07C43/215
Inventor 陈和平保志学刘建生
Owner SUQIAN COSMOS CHEM
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