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A preparing method of methyl propionate

一种丙酸甲酯、丙酸的技术，应用在有机物的制备领域，能够解决丙酸酯纯度帮助不大等问题，达到提升纯度、副产物少、反应转化率高的效果

Active Publication Date: 2015-07-08
SHANDONG SONGSHENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the macroporous strongly acidic ion exchange resin is used as an acidic catalyst. Although the reaction conversion rate is high, the selectivity is high, and it is easy to separate from the product, it does not help much to improve the purity of propionate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (Example 1 methyl propionate)

[0020] The concrete steps of the preparation method of the propionate of the present embodiment are as follows:

[0021] (1) Before the esterification reaction, put 400kg of propionic acid (chemically pure) and 20kg of gel-type strongly acidic ion exchange resin catalyst into the rectification column reactor with a capacity of 1000L. The gel type strongly acidic ion exchange resin catalyst is Dowex 50W×2 hydrogen form resin produced by Dow Chemical with a particle size of 200mesh to 400mesh. Styrene-stilbene copolymer with a crosslinking degree of 2%. After wetting, the resin has a pore size of 2nm to 4nm.

[0022] (2) Heating the reactor, controlling the temperature inside the reactor at 103°C to 108°C, and continuously stirring the materials in the reactor at a stirring speed of 800rpm / min. A mixture of propionic acid (chemically pure) and methanol (chemically pure) was continuously put into the reactor at a rate of 1.2 L / min for est...

Embodiment 2

[0025] (Example 2 methyl propionate)

[0026] The concrete steps of the preparation method of the propionate of the present embodiment are as follows:

[0027] (1) Before the esterification reaction, put 300kg of propionic acid (chemically pure) and 30kg of gel-type strongly acidic ion exchange resin catalyst into the rectification column reactor with a capacity of 1000L. The gel type strongly acidic ion exchange resin catalyst is Dowex 50W×4 hydrogen form resin produced by Dow Chemical with a particle size of 200mesh to 400mesh. Styrene-stilbene copolymer with a crosslinking degree of 4%. After wetting, the resin has a pore size of 2nm to 4nm.

[0028](2) Heating the reactor, controlling the temperature inside the reactor at 103°C to 108°C, and continuously stirring the materials in the reactor at a stirring speed of 800rpm / min. A mixture of propionic acid (chemically pure) and methanol (chemically pure) was continuously put into the reactor at a rate of 1.5 L / min for este...

Embodiment 3

[0034] (Embodiment 3 ethyl propionate)

[0035] The concrete steps of the preparation method of the propionate of the present embodiment are as follows:

[0036] (1) Before the esterification reaction, put 400kg of propionic acid (chemically pure) and 20kg of gel-type strongly acidic ion exchange resin catalyst into the rectification column reactor with a capacity of 1000L. The gel type strongly acidic ion exchange resin catalyst is Dowex 50W × 2 hydrogen form resin produced by Dow Chemical with a particle size of 100mesh to 200mesh. Styrene-stilbene copolymer with a crosslinking degree of 2%. After wetting, the resin has a pore size of 2nm to 4nm.

[0037] (2) Heating the reactor, controlling the temperature inside the reactor at 107°C to 110°C, and continuously stirring the materials in the reactor at a stirring speed of 800rpm / min. A mixture of propionic acid (chemically pure) and ethanol (chemically pure) was continuously put into the reactor at a rate of 1.2 L / min for ...

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Abstract

The invention relates to a preparation method of propionate, belonging to the technical field of preparation of organic substances. Propanoic acid and monobasic alcohol are subjected to esterification reaction under the action of a gel-type strong-acid ion exchange resin catalyst to generate the propionate. The gel-type strong-acid ion exchange resin is a hydrogen-type styrene-stilbene copolymer with sulfonate group, and the pore size of the resin is less than 8nm. The preparation method provided by the invention uses the catalyst to effectively adsorb the reaction impurities and enhance the product purity; and the catalyst has the advantages of favorable catalytic effect and low corrosivity, and can be easily separated from the product.

Description

[0001] This application is a divisional application with an application date of December 20, 2012, an application number of 201210557811.2, and an invention title of "Preparation Method of Propionate". technical field [0002] The invention relates to a method for producing propionate by using propionic acid and monohydric alcohol as raw materials, and belongs to the technical field of organic matter preparation. Background technique [0003] Methyl propionate, ethyl propionate, n-propyl propionate and isopropyl propionate prepared from propionic acid and monohydric alcohol are the most basic chemical raw materials, which can be used as organic solvents and are widely used Used in the preparation of perfumes and other organic compounds. At present, some special industries, such as the battery industry, have an increasing demand for this kind of propionate, and at the same time have extremely high requirements for its purity. Generally, its purity is required to reach 99.5%, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/24C07C67/08B01J31/10
CPCC07C67/08C07C67/54C07C67/56C07C69/24
Inventor 徐奕薛静娴徐松浩
Owner SHANDONG SONGSHENG NEW MATERIAL CO LTD
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