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Method for efficiently separating and purifying anisole and propionic acid

A technology for anisole and propionic acid, applied in the field of separation and purification, can solve problems such as inability to separate and difficult to separate anisole and propionic acid, and achieve the effects of easy recovery, water saving and simple process

Pending Publication Date: 2022-03-08
江苏宏邦化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] P-methoxypropiophenone is a very important chemical raw material and an important intermediate for the synthesis of fragrances; but in the process of its synthesis, a large amount of mixture of anisole and propionic acid is produced, we pass Conventional rectification methods cannot effectively separate it, because anisole and propionic acid form a binary azeotropic system in the process of rectification, and the azeotropic composition becomes anisole: propionic acid=13: 87, so by The traditional rectification method can only obtain a mixture of propionic acid and anisole with a content of 87%, and it is difficult to separate high-purity anisole and propionic acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] To a 2000 mL there-necked flask with a thermometer and a magnetic stirring bar, add 1500 g of a mixture of anisole and propionic acid with a mass content of 20% of anisole, 300 g of water, stir evenly, and the number of rectifying column trays is 10, Heat the system to 104°C, anisole and water start to azeotropically reflux, the top temperature of the rectification column is 96°C, adjust the reflux ratio to 6:3, collect anisole and water, let stand and separate to obtain 270 g content It is 99.5% anisole, and when the temperature at the top of the rectification column is 140°C, propionic acid is collected to obtain 1120 g of propionic acid with a content of 99.1%.

Embodiment 2

[0020] To a 2000 mL there-necked flask with a thermometer and a magnetic stirring bar, add 1300 g of a mixture of anisole and propionic acid with a mass content of 38.5% of anisole, 500 g of water, stir evenly, and the number of plates in the rectifying column is 10, Heat the system to 104°C, anisole and water begin to azeotropically reflux, the temperature at the top of the rectification column is 96°C, adjust the reflux ratio to 3:3, collect anisole and water, let stand to separate layers, and obtain a content of 458 g It was 99.4% anisole, and when the temperature at the top of the rectification column was 140°C, propionic acid was collected, and 729 g of propionic acid with a content of 99.0% was obtained.

Embodiment 3

[0022] To a 2000 mL there-necked flask with a thermometer and a magnetic stirring bar, add 1500 g of a mixture of anisole and propionic acid with a mass content of 20% of anisole, 300 g of water, stir evenly, and the number of rectifying column trays is 20, Heat the system to 108°C, anisole and water start to azeotropically reflux, the temperature at the top of the rectification column is 96°C, adjust the reflux ratio to 6:3, collect anisole and water, stand and separate to obtain 278 g content It is 99.5% anisole, when the top temperature of the rectification column is 140°C, propionic acid is collected, and 1143 g of propionic acid with a content of 99.3% is obtained.

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PUM

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Abstract

The invention discloses a method for efficiently separating and purifying anisole and propionic acid, which comprises the following steps of: adding water into a mixture of anisole and propionic acid, carrying out normal-pressure azeotropic rectification on the mixed solution through a rectifying tower, carrying out azeotropy on anisole and water in the mixture, condensing through a condenser, and separating and purifying the anisole and the propionic acid. Collecting and layering through a receiver to obtain anisole with the purity of more than or equal to 99%, and rectifying out propionic acid at normal pressure to obtain a propionic acid product with the content of more than or equal to 99%. By adding the third component water, the separation of anisole and propionic acid is realized, and the purities of anisole and propionic acid can reach 99%. The method is simple to operate, and the added reagent water is environment-friendly, safe and non-toxic.

Description

technical field [0001] The invention belongs to the technical field of separation and purification, in particular to a method for efficiently separating and purifying anisole and propionic acid. Background technique [0002] The separation and purification methods of organic compounds mainly include recrystallization, distillation, rectification and so on. When synthesizing organic compounds, there are often various chemical components such as products, by-products, and impurities. To make good use of these substances, the separation and purification of each component is very important. In organic substances, especially liquid mixtures, according to the different boiling points of the substances, rectification is often used to separate the components; but sometimes several substances have similar boiling points or some two substances can form an azeotrope, which is difficult to separate by conventional methods , At this time, azeotropic distillation is required; this method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/42C07C43/205C07C51/46C07C53/122
CPCC07C41/42C07C51/46C07C43/205C07C53/122
Inventor 吴庆典薛伟伟王建朱国峰刘晓涛
Owner 江苏宏邦化工科技有限公司
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